diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a30bb11af..8a3075c77 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -32,6 +32,9 @@ variables:
   APPLY_BOT_FILTER_SCRIPT: "$CI_PROJECT_DIR/tools/ci/apply_bot_filter.py"
   CHECKOUT_REF_SCRIPT: "$CI_PROJECT_DIR/tools/ci/checkout_project_ref.py"
 
+# Docker images
+  BOT_DOCKER_IMAGE_TAG: ":latest"
+
 # When 'fetch' strategy is used, Gitlab removes untracked files before checking out
 # new revision. However if the new revision doesn't include some of the submodules
 # which were present in the old revision, such submodule directories would not be
@@ -644,7 +647,7 @@ check_submodule_sync:
 assign_test:
   tags:
     - assign_test
-  image: $CI_DOCKER_REGISTRY/ubuntu-test-env
+  image: $CI_DOCKER_REGISTRY/ubuntu-test-env$BOT_DOCKER_IMAGE_TAG
   stage: assign_test
   # gitlab ci do not support match job with RegEx or wildcard now in dependencies.
   # we have a lot build example jobs. now we don't use dependencies, just download all artificats of build stage.
@@ -810,6 +813,7 @@ example_test_001_01:
 
 example_test_002_01:
   <<: *example_test_template
+  image: $CI_DOCKER_REGISTRY/ubuntu-test-env$BOT_DOCKER_IMAGE_TAG
   tags:
     - ESP32
     - Example_ShieldBox
diff --git a/Kconfig b/Kconfig
index ff1a6d017..98e5f2a9e 100644
--- a/Kconfig
+++ b/Kconfig
@@ -176,6 +176,13 @@ config WARN_WRITE_STRINGS
         For C++, this warns about the deprecated conversion from string
         literals to ``char *``.
 
+config DISABLE_GCC8_WARNINGS
+    bool "Disable new warnings introduced in GCC 6 - 8"
+    default "n"
+    help
+        Enable this option if using GCC 6 or newer, and wanting to disable warnings which don't appear with GCC 5.
+
+
 endmenu # Compiler Options
 
 menu "Component config"
diff --git a/components/app_trace/gcov/gcov_rtio.c b/components/app_trace/gcov/gcov_rtio.c
index e53eb6431..49598ddcc 100644
--- a/components/app_trace/gcov/gcov_rtio.c
+++ b/components/app_trace/gcov/gcov_rtio.c
@@ -31,10 +31,13 @@
 #include "esp_log.h"
 const static char *TAG = "esp_gcov_rtio";
 
-static void (*s_gcov_exit)(void);
+#if GCC_NOT_5_2_0
+void __gcov_dump(void);
+void __gcov_reset(void);
+#else
+/* The next code for old GCC */
 
-/* TODO: remove code extracted from GCC when IDF toolchain will be updated */
-/*=============== GCC CODE START ====================*/
+static void (*s_gcov_exit)(void);
 /* Root of a program/shared-object state */
 struct gcov_root
 {
@@ -53,27 +56,36 @@ static void esp_gcov_reset_status(void)
   __gcov_root.dumped = 0;
   __gcov_root.run_counted = 0;
 }
-/*=============== GCC CODE END ====================*/
+#endif
+
 
 static int esp_dbg_stub_gcov_dump_do(void)
 {
     int ret = ESP_OK;
 
+    ESP_EARLY_LOGV(TAG, "Alloc apptrace down buf %d bytes", ESP_GCOV_DOWN_BUF_SIZE);
+    void *down_buf = malloc(ESP_GCOV_DOWN_BUF_SIZE);
+    if (down_buf == NULL) {
+        ESP_EARLY_LOGE(TAG, "Could not allocate memory for the buffer");
+        return ESP_ERR_NO_MEM;
+    }
+    ESP_EARLY_LOGV(TAG, "Config apptrace down buf");
+    esp_apptrace_down_buffer_config(down_buf, ESP_GCOV_DOWN_BUF_SIZE);
+    ESP_EARLY_LOGV(TAG, "Dump data...");
+#if GCC_NOT_5_2_0
+    __gcov_dump();
+    // reset dump status to allow incremental data accumulation
+    __gcov_reset();
+#else
     ESP_EARLY_LOGV(TAG, "Check for dump handler %p", s_gcov_exit);
     if (s_gcov_exit) {
-        ESP_EARLY_LOGV(TAG, "Alloc apptrace down buf %d bytes", ESP_GCOV_DOWN_BUF_SIZE);
-        void *down_buf = malloc(ESP_GCOV_DOWN_BUF_SIZE);
-        if (down_buf == NULL) {
-            ESP_EARLY_LOGE(TAG, "Failed to send files transfer stop cmd (%d)!", ret);
-            return ESP_ERR_NO_MEM;
-        }
-        ESP_EARLY_LOGV(TAG, "Config apptrace down buf");
-        esp_apptrace_down_buffer_config(down_buf, ESP_GCOV_DOWN_BUF_SIZE);
-        ESP_EARLY_LOGV(TAG, "Dump data... %p", s_gcov_exit);
         s_gcov_exit();
-        ESP_EARLY_LOGV(TAG, "Free apptrace down buf");
-        free(down_buf);
+        // reset dump status to allow incremental data accumulation
+        esp_gcov_reset_status();
     }
+#endif
+    ESP_EARLY_LOGV(TAG, "Free apptrace down buf");
+    free(down_buf);
     ESP_EARLY_LOGV(TAG, "Finish file transfer session");
     ret = esp_apptrace_fstop(ESP_APPTRACE_DEST_TRAX);
     if (ret != ESP_OK) {
@@ -91,24 +103,26 @@ static int esp_dbg_stub_gcov_dump_do(void)
  */
 static int esp_dbg_stub_gcov_entry(void)
 {
+#if GCC_NOT_5_2_0
+    return esp_dbg_stub_gcov_dump_do();
+#else
     int ret = ESP_OK;
-
     // disable IRQs on this CPU, other CPU is halted by OpenOCD
     unsigned irq_state = portENTER_CRITICAL_NESTED();
     ret = esp_dbg_stub_gcov_dump_do();
-    // reset dump status to allow incremental data accumulation
-    esp_gcov_reset_status();
     portEXIT_CRITICAL_NESTED(irq_state);
     return ret;
+#endif
 }
 
 void esp_gcov_dump()
 {
-#if CONFIG_FREERTOS_UNICORE == 0
+    // disable IRQs on this CPU, other CPU is halted by OpenOCD
+    unsigned irq_state = portENTER_CRITICAL_NESTED();
+#if !CONFIG_FREERTOS_UNICORE
     int other_core = xPortGetCoreID() ? 0 : 1;
     esp_cpu_stall(other_core);
 #endif
-
     while (!esp_apptrace_host_is_connected(ESP_APPTRACE_DEST_TRAX)) {
         // to avoid complains that task watchdog got triggered for other tasks
         TIMERG0.wdt_wprotect=TIMG_WDT_WKEY_VALUE;
@@ -121,24 +135,27 @@ void esp_gcov_dump()
     }
 
     esp_dbg_stub_gcov_dump_do();
-    // reset dump status to allow incremental data accumulation
-    esp_gcov_reset_status();
-#if CONFIG_FREERTOS_UNICORE == 0
+#if !CONFIG_FREERTOS_UNICORE
     esp_cpu_unstall(other_core);
 #endif
+    portEXIT_CRITICAL_NESTED(irq_state);
 }
 
-int gcov_rtio_atexit(void (*function)(void))
+int gcov_rtio_atexit(void (*function)(void) __attribute__ ((unused)))
 {
+#if GCC_NOT_5_2_0
+    ESP_EARLY_LOGV(TAG, "%s", __FUNCTION__);
+#else
     ESP_EARLY_LOGV(TAG, "%s %p", __FUNCTION__, function);
     s_gcov_exit = function;
+#endif
     esp_dbg_stub_entry_set(ESP_DBG_STUB_ENTRY_GCOV, (uint32_t)&esp_dbg_stub_gcov_entry);
     return 0;
 }
 
 void *gcov_rtio_fopen(const char *path, const char *mode)
 {
-    ESP_EARLY_LOGV(TAG, "%s", __FUNCTION__);
+    ESP_EARLY_LOGV(TAG, "%s '%s' '%s'", __FUNCTION__, path, mode);
     return esp_apptrace_fopen(ESP_APPTRACE_DEST_TRAX, path, mode);
 }
 
@@ -150,8 +167,10 @@ int gcov_rtio_fclose(void *stream)
 
 size_t gcov_rtio_fread(void *ptr, size_t size, size_t nmemb, void *stream)
 {
-    ESP_EARLY_LOGV(TAG, "%s", __FUNCTION__);
-    return esp_apptrace_fread(ESP_APPTRACE_DEST_TRAX, ptr, size, nmemb, stream);
+    ESP_EARLY_LOGV(TAG, "%s read %u", __FUNCTION__, size*nmemb);
+    size_t sz = esp_apptrace_fread(ESP_APPTRACE_DEST_TRAX, ptr, size, nmemb, stream);
+    ESP_EARLY_LOGV(TAG, "%s actually read %u", __FUNCTION__, sz);
+    return sz;
 }
 
 size_t gcov_rtio_fwrite(const void *ptr, size_t size, size_t nmemb, void *stream)
@@ -162,17 +181,15 @@ size_t gcov_rtio_fwrite(const void *ptr, size_t size, size_t nmemb, void *stream
 
 int gcov_rtio_fseek(void *stream, long offset, int whence)
 {
-    ESP_EARLY_LOGV(TAG, "%s", __FUNCTION__);
     int ret = esp_apptrace_fseek(ESP_APPTRACE_DEST_TRAX, stream, offset, whence);
-    ESP_EARLY_LOGV(TAG, "%s EXIT", __FUNCTION__);
+    ESP_EARLY_LOGV(TAG, "%s(%p %ld %d) = %d", __FUNCTION__, stream, offset, whence, ret);
     return ret;
 }
 
 long gcov_rtio_ftell(void *stream)
 {
-    ESP_EARLY_LOGV(TAG, "%s", __FUNCTION__);
     long ret = esp_apptrace_ftell(ESP_APPTRACE_DEST_TRAX, stream);
-    ESP_EARLY_LOGV(TAG, "%s", __FUNCTION__);
+    ESP_EARLY_LOGV(TAG, "%s(%p) = %ld", __FUNCTION__, stream, ret);
     return ret;
 }
 #endif
diff --git a/components/bt/CMakeLists.txt b/components/bt/CMakeLists.txt
index 1bcea86c4..df32f9f94 100644
--- a/components/bt/CMakeLists.txt
+++ b/components/bt/CMakeLists.txt
@@ -277,6 +277,10 @@ set(COMPONENT_PRIV_REQUIRES nvs_flash)
 register_component()
 
 if(CONFIG_BT_ENABLED)
+    if(GCC_NOT_5_2_0)
+        component_compile_options(-Wno-implicit-fallthrough -Wno-unused-const-variable)
+    endif()
+
     target_link_libraries(bt "-L${CMAKE_CURRENT_LIST_DIR}/lib")
     target_link_libraries(bt btdm_app)
 endif()
diff --git a/components/bt/bluedroid/osi/list.c b/components/bt/bluedroid/osi/list.c
index 634727a66..252420399 100644
--- a/components/bt/bluedroid/osi/list.c
+++ b/components/bt/bluedroid/osi/list.c
@@ -97,13 +97,13 @@ list_node_t *list_back_node(const list_t *list) {
 }
 
 bool list_insert_after(list_t *list, list_node_t *prev_node, void *data) {
-  assert(list != NULL);
-  assert(prev_node != NULL);
-  assert(data != NULL);
-  list_node_t *node = (list_node_t *) osi_calloc(sizeof(list_node_t));
-  if (!node)
-    return false;
-
+    assert(list != NULL);
+    assert(prev_node != NULL);
+    assert(data != NULL);
+    list_node_t *node = (list_node_t *)osi_calloc(sizeof(list_node_t));
+    if (!node) {
+        return false;
+    }
     node->next = prev_node->next;
     node->data = data;
     prev_node->next = node;
diff --git a/components/bt/component.mk b/components/bt/component.mk
index f0c1f1202..eb9b39c02 100644
--- a/components/bt/component.mk
+++ b/components/bt/component.mk
@@ -17,6 +17,11 @@ COMPONENT_ADD_LINKER_DEPS := $(patsubst %,$(COMPONENT_PATH)/lib/lib%.a,$(LIBS))
 
 COMPONENT_SUBMODULES += lib
 
+ifeq ($(GCC_NOT_5_2_0), 1)
+# TODO: annotate fallthroughs in Bluedroid code with comments
+CFLAGS += -Wno-implicit-fallthrough
+endif
+
 endif
 
 
@@ -114,4 +119,12 @@ COMPONENT_SRCDIRS +=    bluedroid/bta/dm                      \
                         bluedroid/utils                       \
                         bluedroid/api                         \
                         bluedroid
+
+ifeq ($(GCC_NOT_5_2_0), 1)
+bluedroid/bta/sdp/bta_sdp_act.o: CFLAGS += -Wno-unused-const-variable
+bluedroid/btc/core/btc_config.o: CFLAGS += -Wno-unused-const-variable
+bluedroid/stack/btm/btm_sec.o: CFLAGS += -Wno-unused-const-variable
+bluedroid/stack/smp/smp_keys.o: CFLAGS += -Wno-unused-const-variable
+endif
+
 endif
diff --git a/components/coap/CMakeLists.txt b/components/coap/CMakeLists.txt
index 225745e8c..a7800e64f 100644
--- a/components/coap/CMakeLists.txt
+++ b/components/coap/CMakeLists.txt
@@ -32,8 +32,10 @@ set_source_files_properties(
     PROPERTIES COMPILE_FLAGS
     -Wno-write-strings)
 
-# Temporary suppress "fallthrough" warnings until they are fixed in libcoap repo
-set_source_files_properties(
-    libcoap/src/option.c
-    PROPERTIES COMPILE_FLAGS
-    -Wno-implicit-fallthrough)
+if(GCC_NOT_5_2_0)
+    # Temporary suppress "fallthrough" warnings until they are fixed in libcoap repo
+    set_source_files_properties(
+        libcoap/src/option.c
+        PROPERTIES COMPILE_FLAGS
+        -Wno-implicit-fallthrough)
+endif()
\ No newline at end of file
diff --git a/components/coap/component.mk b/components/coap/component.mk
index 4b3d56f56..bd7b0e0a6 100644
--- a/components/coap/component.mk
+++ b/components/coap/component.mk
@@ -12,5 +12,7 @@ COMPONENT_SUBMODULES += libcoap
 
 libcoap/src/debug.o: CFLAGS += -Wno-write-strings
 libcoap/src/pdu.o: CFLAGS += -Wno-write-strings
+ifeq ($(GCC_NOT_5_2_0), 1)
 # Temporary suppress "fallthrough" warnings until they are fixed in libcoap repo
 libcoap/src/option.o: CFLAGS += -Wno-implicit-fallthrough
+endif
diff --git a/components/cxx/cxx_exception_stubs.cpp b/components/cxx/cxx_exception_stubs.cpp
index b67bc2ad3..f09f946dd 100644
--- a/components/cxx/cxx_exception_stubs.cpp
+++ b/components/cxx/cxx_exception_stubs.cpp
@@ -36,42 +36,26 @@ extern "C" void __cxx_fatal_exception_int(int i)
     abort();
 }
 
+#if !GCC_NOT_5_2_0
 void std::__throw_bad_exception(void) __attribute__((alias("__cxx_fatal_exception")));
-
 void std::__throw_bad_alloc(void) __attribute__((alias("__cxx_fatal_exception")));
-
 void std::__throw_bad_cast(void) __attribute__((alias("__cxx_fatal_exception")));
-
 void std::__throw_bad_typeid(void) __attribute__((alias("__cxx_fatal_exception")));
-
 void std::__throw_logic_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_domain_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_invalid_argument(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_length_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_out_of_range(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_out_of_range_fmt(const char*, ...) __attribute__((alias("__cxx_fatal_exception_message_va")));
-
 void std::__throw_runtime_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_range_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_overflow_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_underflow_error(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_ios_failure(const char*) __attribute__((alias("__cxx_fatal_exception_message")));
-
 void std::__throw_system_error(int) __attribute__((alias("__cxx_fatal_exception_int")));
-
 void std::__throw_bad_function_call(void) __attribute__((alias("__cxx_fatal_exception")));
-
 void std::__throw_future_error(int) __attribute__((alias("__cxx_fatal_exception_int")));
-
+#endif
 
 /* The following definitions are needed because libstdc++ is also compiled with
    __throw_exception_again defined to throw, and some other exception code in a few places.
diff --git a/components/cxx/test/test_cxx.cpp b/components/cxx/test/test_cxx.cpp
index 91bac6313..ead4774d1 100644
--- a/components/cxx/test/test_cxx.cpp
+++ b/components/cxx/test/test_cxx.cpp
@@ -1,5 +1,7 @@
 #include <vector>
-#include <algorithm>
+#include <numeric>
+#include <stdexcept>
+#include <string>
 #include "unity.h"
 #include "esp_log.h"
 #include "freertos/FreeRTOS.h"
@@ -271,6 +273,22 @@ TEST_CASE("c++ exceptions emergency pool", "[cxx] [ignore]")
 #endif
 }
 
+#else // !CONFIG_CXX_EXCEPTIONS
+
+TEST_CASE("std::out_of_range exception when -fno-exceptions", "[cxx][reset=abort,SW_CPU_RESET]")
+{
+    std::vector<int> v(10);
+    v.at(20) = 42;
+    TEST_FAIL_MESSAGE("Unreachable because we are aborted on the line above");
+}
+
+TEST_CASE("std::bad_alloc exception when -fno-exceptions", "[cxx][reset=abort,SW_CPU_RESET]")
+{
+    std::string s = std::string(2000000000, 'a');
+    (void)s;
+    TEST_FAIL_MESSAGE("Unreachable because we are aborted on the line above");
+}
+
 #endif
 
 /* These test cases pull a lot of code from libstdc++ and are disabled for now
diff --git a/components/espcoredump/test/expected_output_new_CT b/components/espcoredump/test/expected_output_new_CT
new file mode 100644
index 000000000..f4e50d853
--- /dev/null
+++ b/components/espcoredump/test/expected_output_new_CT
@@ -0,0 +1,540 @@
+espcoredump.py v0.2-dev
+===============================================================
+==================== ESP32 CORE DUMP START ====================
+
+================== CURRENT THREAD REGISTERS ===================
+pc             0x400d216d	0x400d216d <recur_func+77>
+lbeg           0x400014fd	1073747197
+lend           0x4000150d	1073747213
+lcount         0xffffffff	4294967295
+sar            0x0	0
+ps             0x60420	394272
+threadptr      <unavailable>
+br             <unavailable>
+scompare1      <unavailable>
+acclo          <unavailable>
+acchi          <unavailable>
+m0             <unavailable>
+m1             <unavailable>
+m2             <unavailable>
+m3             <unavailable>
+expstate       <unavailable>
+f64r_lo        <unavailable>
+f64r_hi        <unavailable>
+f64s           <unavailable>
+fcr            <unavailable>
+fsr            <unavailable>
+a0             0x400d2148	1074602312
+a1             0x3ffb7bc0	1073445824
+a2             0x2	2
+a3             0x3f403c36	1061174326
+a4             0x3ffb7c00	1073445888
+a5             0x3ffae8f4	1073408244
+a6             0x0	0
+a7             0x0	0
+a8             0x5	5
+a9             0xffffffad	-83
+a10            0x20	32
+a11            0x3ffb3e6c	1073430124
+a12            0x1	1
+a13            0x80	128
+a14            0x1	1
+a15            0x0	0
+
+==================== CURRENT THREAD STACK =====================
+#0  0x400d216d in recur_func () at /home/dragon/esp/esp-idf/examples/get-started/hello_world/main/hello_world_main.c:70
+#1  0x400d2148 in recur_func () at /home/dragon/esp/esp-idf/examples/get-started/hello_world/main/hello_world_main.c:63
+#2  0x400d2148 in recur_func () at /home/dragon/esp/esp-idf/examples/get-started/hello_world/main/hello_world_main.c:63
+#3  0x400d2190 in unaligned_ptr_task (pvParameter=0x0) at /home/dragon/esp/esp-idf/examples/get-started/hello_world/main/hello_world_main.c:80
+
+======================== THREADS INFO =========================
+  Id   Target Id         Frame 
+* 1    <main task>       0x400d216d in recur_func () at /home/dragon/esp/esp-idf/examples/get-started/hello_world/main/hello_world_main.c:70
+  2    process 1         0x400e4a86 in esp_vApplicationWaitiHook () at /home/dragon/esp/esp-idf/components/esp32/freertos_hooks.c:66
+  3    process 2         0x400e4a86 in esp_vApplicationWaitiHook () at /home/dragon/esp/esp-idf/components/esp32/freertos_hooks.c:66
+  4    process 3         0x4008559e in vTaskDelay (xTicksToDelay=<optimized out>) at /home/dragon/esp/esp-idf/components/freertos/tasks.c:1491
+  5    process 4         0x4008559e in vTaskDelay (xTicksToDelay=<optimized out>) at /home/dragon/esp/esp-idf/components/freertos/tasks.c:1491
+  6    process 5         0x4008629c in prvProcessTimerOrBlockTask (xNextExpireTime=<optimized out>, xListWasEmpty=<optimized out>) at /home/dragon/esp/esp-idf/components/freertos/timers.c:588
+  7    process 6         0x400846ad in xQueueGenericReceive (xQueue=0x3ffaea30, pvBuffer=0x0, xTicksToWait=4294967295, xJustPeeking=0) at /home/dragon/esp/esp-idf/components/freertos/queue.c:1591
+  8    process 7         0x4008114a in esp_crosscore_int_send_yield (core_id=1) at /home/dragon/esp/esp-idf/components/esp32/crosscore_int.c:112
+  9    process 8         0x400846ad in xQueueGenericReceive (xQueue=0x3ffafd44, pvBuffer=0x0, xTicksToWait=4294967295, xJustPeeking=0) at /home/dragon/esp/esp-idf/components/freertos/queue.c:1591
+
+======================= ALL MEMORY REGIONS ========================
+Name   Address   Size   Attrs
+.rtc.text 0x400c0000 0x0 RW  
+.rtc_noinit 0x50000000 0x0 RW  
+.iram0.vectors 0x40080000 0x400 R XA
+.iram0.text 0x40080400 0x93f8 RWXA
+.dram0.data 0x3ffb0000 0x2288 RW A
+.noinit 0x3ffb2288 0x0 RW  
+.flash.rodata 0x3f400020 0x6cd4 RW A
+.flash.text 0x400d0018 0x14cb4 R XA
+.coredump.tasks.data 0x3ffb3e04 0x164 RW 
+.coredump.tasks.data 0x3ffb7b00 0x1d0 RW 
+.coredump.tasks.data 0x3ffb56fc 0x164 RW 
+.coredump.tasks.data 0x3ffb5590 0x164 RW 
+.coredump.tasks.data 0x3ffb5c68 0x164 RW 
+.coredump.tasks.data 0x3ffb5b00 0x160 RW 
+.coredump.tasks.data 0x3ffb3c9c 0x164 RW 
+.coredump.tasks.data 0x3ffb7360 0x16c RW 
+.coredump.tasks.data 0x3ffb3f6c 0x164 RW 
+.coredump.tasks.data 0x3ffb8370 0x164 RW 
+.coredump.tasks.data 0x3ffb66c8 0x164 RW 
+.coredump.tasks.data 0x3ffb6540 0x180 RW 
+.coredump.tasks.data 0x3ffafa88 0x164 RW 
+.coredump.tasks.data 0x3ffaf900 0x180 RW 
+.coredump.tasks.data 0x3ffb3b34 0x164 RW 
+.coredump.tasks.data 0x3ffb3980 0x1ac RW 
+.coredump.tasks.data 0x3ffafd98 0x164 RW 
+.coredump.tasks.data 0x3ffb35a0 0x188 RW 
+
+====================== CORE DUMP MEMORY CONTENTS ========================
+.coredump.tasks.data 0x3ffb3e04 0x164 RW 
+0x3ffb3e04:	0x3ffb7b70	0x3ffb7c70	0x0000006d	0x3ffb2d3c
+0x3ffb3e14:	0x3ffb2d3c	0x3ffb3e04	0x3ffb2d34	0x00000012
+0x3ffb3e24:	0xa5a5a5a5	0xa5a5a5a5	0x3ffb3e04	0x00000000
+0x3ffb3e34:	0x00000007	0x3ffb74d4	0x6c616e75	0x656e6769
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+0x3ffb67e8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb67f8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6808:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6818:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6828:	0x97f9e600
+.coredump.tasks.data 0x3ffb6540 0x180 RW 
+0x3ffb6540:	0x400821d8	0x4008629c	0x00060830	0x8008638f
+0x3ffb6550:	0x3ffb6600	0x3ffb2ea8	0x00000000	0x00000001
+0x3ffb6560:	0x3ffb510c	0x00000000	0x00000001	0x8008629c
+0x3ffb6570:	0x3ffb65e0	0x00000000	0x3ffb2c00	0x3ffb5e18
+0x3ffb6580:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6590:	0xa5a5a5a5	0xa5a5a5a5	0x00000000	0x00000000
+0x3ffb65a0:	0x00000000	0x400823d1	0x00000000	0x400864e8
+0x3ffb65b0:	0x3ffaf97c	0x00000000	0x00000000	0x00000000
+0x3ffb65c0:	0xb33fffff	0x00000000	0x00000000	0x00000000
+0x3ffb65d0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb65e0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb65f0:	0x00000000	0x3ffb6630	0x00000000	0x00000000
+0x3ffb6600:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6610:	0x3ffaf97c	0x00000000	0x00000000	0x00000000
+0x3ffb6620:	0x00000000	0x3ffb6660	0x00000000	0x00000000
+0x3ffb6630:	0x00000001	0x00000000	0x00000000	0x00000000
+0x3ffb6640:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6650:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6660:	0x00000000	0x00000000	0x3ffb666c	0x00000000
+0x3ffb6670:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6680:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb6690:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb66a0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb66b0:	0x00000000	0x00000000	0x00000000	0x00000000
+.coredump.tasks.data 0x3ffafa88 0x164 RW 
+0x3ffafa88:	0x3ffaf900	0x3ffafa20	0x5ff990da	0x3ffb3b3c
+0x3ffafa98:	0x3ffafda0	0x3ffafa88	0x3ffb2c24	0x00000003
+0x3ffafaa8:	0x3ffaea5c	0x3ffaea5c	0x3ffafa88	0x3ffaea54
+0x3ffafab8:	0x00000016	0x3ffaea84	0x5f707365	0x656d6974
+0x3ffafac8:	0xe11f0072	0x00f45ee9	0x00000000	0x3ffafa80
+0x3ffafad8:	0x00000000	0x00060021	0x00000016	0x00000000
+0x3ffafae8:	0x00000000	0x00000000	0x00000000	0x3ffae88c
+0x3ffafaf8:	0x3ffae8f4	0x3ffae95c	0x00000000	0x00000000
+0x3ffafb08:	0x00000001	0x00000000	0x3f403c78	0x00000000
+0x3ffafb18:	0x40001d48	0x00000000	0x00000000	0x00000000
+0x3ffafb28:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafb38:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafb48:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafb58:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafb68:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafb78:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafb88:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafb98:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafba8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafbb8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafbc8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafbd8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafbe8:	0x354b8800
+.coredump.tasks.data 0x3ffaf900 0x180 RW 
+0x3ffaf900:	0x400821d8	0x400846ad	0x00060030	0x800d14fb
+0x3ffaf910:	0x3ffaf9c0	0x3ffaea30	0x00000000	0x3ffaea78
+0x3ffaf920:	0x00000000	0x00000001	0x00000001	0x800846ad
+0x3ffaf930:	0x3ffaf9a0	0x00000000	0x3ffb2e9c	0x3ffb2e9c
+0x3ffaf940:	0x00000001	0x00060021	0x00000000	0x00000000
+0x3ffaf950:	0xa5a5a5a5	0xa5a5a5a5	0x00000000	0x00000000
+0x3ffaf960:	0x00000000	0x400823d1	0x00000001	0x400864e8
+0x3ffaf970:	0x3ffa8d3c	0x00000000	0x00000000	0x00000000
+0x3ffaf980:	0xb33fffff	0x00000000	0x00000000	0x00000000
+0x3ffaf990:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffaf9a0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffaf9b0:	0x00000000	0x3ffafa00	0x00000000	0x00000000
+0x3ffaf9c0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffaf9d0:	0xffffffff	0x00000000	0x00000000	0x00000000
+0x3ffaf9e0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffaf9f0:	0x00000000	0x3ffafa20	0x00000000	0x00000000
+0x3ffafa00:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafa10:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafa20:	0x00000000	0x00000000	0x3ffafa2c	0x00000000
+0x3ffafa30:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafa40:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafa50:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafa60:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafa70:	0x00000000	0x00000000	0x00000000	0x00000000
+.coredump.tasks.data 0x3ffb3b34 0x164 RW 
+0x3ffb3b34:	0x3ffb3980	0x3ffb3ac0	0x88083cc0	0x3ffb2c2c
+0x3ffb3b44:	0x3ffafa90	0x3ffb3b34	0x3ffb2c24	0x00000001
+0x3ffb3b54:	0x3ffaff2c	0x3ffaff2c	0x3ffb3b34	0x3ffaff24
+0x3ffb3b64:	0x00000018	0x3ffb3730	0x31637069	0xeff9c300
+0x3ffb3b74:	0xc4c0f656	0x008423ac	0x00000001	0x3ffb3b2c
+0x3ffb3b84:	0x00000000	0x00060021	0x00000018	0x00000000
+0x3ffb3b94:	0x00000000	0x00000000	0x00000000	0x3ffae88c
+0x3ffb3ba4:	0x3ffae8f4	0x3ffae95c	0x00000000	0x00000000
+0x3ffb3bb4:	0x00000001	0x00000000	0x3f403c78	0x00000000
+0x3ffb3bc4:	0x40001d48	0x00000000	0x00000000	0x00000000
+0x3ffb3bd4:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3be4:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3bf4:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c04:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c14:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c24:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c34:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c44:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c54:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c64:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c74:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c84:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3c94:	0x048ed900
+.coredump.tasks.data 0x3ffb3980 0x1ac RW 
+0x3ffb3980:	0x400821d8	0x4008114a	0x00060030	0x800846ad
+0x3ffb3990:	0x3ffb3a40	0x00000001	0x3ffb2e9c	0x3ffb2ea0
+0x3ffb39a0:	0x3ffe7c90	0x00000000	0x00060723	0x8008114a
+0x3ffb39b0:	0x3ffb3a20	0x3ff000e0	0x00000001	0x3ffb102c
+0x3ffb39c0:	0x00000001	0x00060020	0x00060023	0x00000000
+0x3ffb39d0:	0x3ffb3a40	0x00000001	0x00000000	0x00000000
+0x3ffb39e0:	0x00000000	0x400823d1	0x00000001	0x400864e8
+0x3ffb39f0:	0x3ffacddc	0x00000000	0x00000000	0x00000000
+0x3ffb3a00:	0xb33fffff	0x00000000	0x00000000	0x00000000
+0x3ffb3a10:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3a20:	0xb33fffff	0x00000000	0x00000000	0x00000000
+0x3ffb3a30:	0x800811b3	0x3ffb3a60	0x3ffaff00	0x00000000
+0x3ffb3a40:	0x00000001	0x00000001	0x00060020	0x00060023
+0x3ffb3a50:	0x00000000	0x3ffb3aa0	0x00000001	0x40082ff8
+0x3ffb3a60:	0x00000000	0x00000009	0x00000000	0x00060723
+0x3ffb3a70:	0xffffffff	0x3ffb3aa0	0x00000001	0x40082ff8
+0x3ffb3a80:	0x3ffaff48	0x00000000	0x00000001	0x00000000
+0x3ffb3a90:	0x00000000	0x3ffb3ac0	0x00000000	0x00000000
+0x3ffb3aa0:	0x00000001	0x00000000	0x00000000	0x00000000
+0x3ffb3ab0:	0x80080f2c	0x3ffe7d80	0x00000028	0x00000028
+0x3ffb3ac0:	0x00000000	0x00000000	0x3ffb3acc	0x00000000
+0x3ffb3ad0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3ae0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3af0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3b00:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3b10:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3b20:	0x00000000	0x00000000	0x00000000
+.coredump.tasks.data 0x3ffafd98 0x164 RW 
+0x3ffafd98:	0x3ffb35a0	0x3ffb36c0	0x73fa8154	0x3ffafa90
+0x3ffafda8:	0x3ffb2c2c	0x3ffafd98	0x3ffb2c24	0x00000001
+0x3ffafdb8:	0x3ffafd70	0x3ffafd70	0x3ffafd98	0x3ffafd68
+0x3ffafdc8:	0x00000018	0x3ffb332c	0x30637069	0x1e3d8600
+0x3ffafdd8:	0xfe7fd40a	0x0014a8b5	0x00000000	0x3ffb3728
+0x3ffafde8:	0x00000000	0x00060021	0x00000018	0x00000000
+0x3ffafdf8:	0x00000000	0x00000000	0x00000000	0x3ffae88c
+0x3ffafe08:	0x3ffae8f4	0x3ffae95c	0x00000000	0x00000000
+0x3ffafe18:	0x00000001	0x00000000	0x3f403c78	0x00000000
+0x3ffafe28:	0x40001d48	0x00000000	0x00000000	0x00000000
+0x3ffafe38:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafe48:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafe58:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafe68:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafe78:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafe88:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafe98:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafea8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafeb8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafec8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafed8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafee8:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffafef8:	0x7eb2c400
+.coredump.tasks.data 0x3ffb35a0 0x188 RW 
+0x3ffb35a0:	0x400821d8	0x400846ad	0x00060030	0x800811b3
+0x3ffb35b0:	0x3ffb3660	0x3ffafd44	0x00000000	0x3ffafd8c
+0x3ffb35c0:	0x00000000	0x00000001	0x00000001	0x800846ad
+0x3ffb35d0:	0x3ffb3640	0x00000000	0x3ffb2e9c	0x3ffb2e9c
+0x3ffb35e0:	0x3ffe3af0	0x00000000	0x00000002	0x00000000
+0x3ffb35f0:	0xa5a5a5a5	0xa5a5a5a5	0x00000000	0x00000000
+0x3ffb3600:	0x00000000	0x400823d1	0x3ffe3af0	0x400864e8
+0x3ffb3610:	0x3ffac9dc	0x00000000	0x00000000	0x00000000
+0x3ffb3620:	0xb33fffff	0x00000000	0x00000000	0x00000000
+0x3ffb3630:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3640:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3650:	0x00000000	0x3ffb36a0	0x00000000	0x00000000
+0x3ffb3660:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3670:	0xffffffff	0x00000000	0x00000000	0x00000000
+0x3ffb3680:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3690:	0x00000000	0x3ffb36c0	0x00000000	0x00000000
+0x3ffb36a0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb36b0:	0x80080eaa	0x3ffe3ba0	0x3ffb2c0c	0x3ffb2ee4
+0x3ffb36c0:	0x00000000	0x00000000	0x3ffb36cc	0x00000000
+0x3ffb36d0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb36e0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb36f0:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3700:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3710:	0x00000000	0x00000000	0x00000000	0x00000000
+0x3ffb3720:	0x00000000	0x00000000
+
+===================== ESP32 CORE DUMP END =====================
+===============================================================
+Done!
diff --git a/components/espcoredump/test/test_espcoredump.sh b/components/espcoredump/test/test_espcoredump.sh
index 8a8499ce4..7970dd132 100755
--- a/components/espcoredump/test/test_espcoredump.sh
+++ b/components/espcoredump/test/test_espcoredump.sh
@@ -1,10 +1,16 @@
 #! /bin/bash
 
+if [ "$(xtensa-esp32-elf-gcc -dumpversion)" = "5.2.0" ]; then
+    EXPECTED_OUTPUT="expected_output"
+else
+    # GCC_NOT_5_2_0 just a hint to remove later
+    EXPECTED_OUTPUT="expected_output_new_CT"
+fi
+
 { coverage debug sys \
     && coverage erase \
     && coverage run -a --source=espcoredump ../espcoredump.py info_corefile -m -t b64 -c coredump.b64 test.elf &> output \
-    && diff expected_output output \
+    && diff ${EXPECTED_OUTPUT} output \
     && coverage run -a --source=espcoredump ./test_espcoredump.py \
     && coverage report \
 ; } || { echo 'The test for espcoredump has failed!'; exit 1; }
-
diff --git a/components/expat/CMakeLists.txt b/components/expat/CMakeLists.txt
index 02037dc21..821705658 100644
--- a/components/expat/CMakeLists.txt
+++ b/components/expat/CMakeLists.txt
@@ -14,4 +14,6 @@ component_compile_definitions(HAVE_EXPAT_CONFIG_H)
 component_compile_definitions(HAVE_GETRANDOM)
 
 # Temporary suppress "fallthrough" warnings until they are fixed in expat repo
-component_compile_options(-Wno-implicit-fallthrough)
+if(GCC_NOT_5_2_0)
+    component_compile_options(-Wno-implicit-fallthrough)
+endif()
\ No newline at end of file
diff --git a/components/expat/component.mk b/components/expat/component.mk
index 851f6a8c3..351fe3b74 100644
--- a/components/expat/component.mk
+++ b/components/expat/component.mk
@@ -6,7 +6,8 @@ COMPONENT_ADD_INCLUDEDIRS := expat/expat/lib port/include
 COMPONENT_SRCDIRS := expat/expat/lib port
 
 CFLAGS += -DHAVE_EXPAT_CONFIG_H -DHAVE_GETRANDOM
+ifeq ($(GCC_NOT_5_2_0), 1)
 # Temporary suppress "fallthrough" warnings until they are fixed in expat repo
 CFLAGS += -Wno-implicit-fallthrough
-
+endif
 COMPONENT_SUBMODULES += expat
diff --git a/components/libsodium/CMakeLists.txt b/components/libsodium/CMakeLists.txt
index 2ed003f13..aa39b0047 100644
--- a/components/libsodium/CMakeLists.txt
+++ b/components/libsodium/CMakeLists.txt
@@ -139,11 +139,8 @@ component_compile_definitions(
     __STDC_CONSTANT_MACROS
     )
 
-component_compile_options(-Wno-unknown-pragmas)
-
 # patch around warnings in third-party files
 set_source_files_properties(
-    ${SRC}/crypto_pwhash/argon2/argon2-fill-block-ref.c
     ${SRC}/crypto_pwhash/argon2/pwhash_argon2i.c
     ${SRC}/crypto_pwhash/argon2/argon2-core.c
     ${SRC}/crypto_pwhash/scryptsalsa208sha256/pwhash_scryptsalsa208sha256.c
@@ -155,10 +152,18 @@ set_source_files_properties(
     PROPERTIES COMPILE_FLAGS
     -Wno-unused-variable
     )
+set_source_files_properties(
+    ${SRC}/crypto_pwhash/argon2/argon2-fill-block-ref.c
+    PROPERTIES COMPILE_FLAGS
+    -Wno-unknown-pragmas
+    )
 
 # Temporary suppress "fallthrough" warnings until they are fixed in libsodium repo
-set_source_files_properties(
-    ${SRC}/crypto_shorthash/siphash24/ref/shorthash_siphashx24_ref.c
-    ${SRC}/crypto_shorthash/siphash24/ref/shorthash_siphash24_ref.c
-    PROPERTIES COMPILE_FLAGS
-    -Wno-implicit-fallthrough)
+if(GCC_NOT_5_2_0)
+    set_source_files_properties(
+        ${SRC}/crypto_shorthash/siphash24/ref/shorthash_siphashx24_ref.c
+        ${SRC}/crypto_shorthash/siphash24/ref/shorthash_siphash24_ref.c
+        PROPERTIES COMPILE_FLAGS
+        -Wno-implicit-fallthrough
+        )
+endif()
\ No newline at end of file
diff --git a/components/libsodium/component.mk b/components/libsodium/component.mk
index 12dcb571a..c84519cb3 100644
--- a/components/libsodium/component.mk
+++ b/components/libsodium/component.mk
@@ -87,6 +87,8 @@ CFLAGS +=  -DNATIVE_LITTLE_ENDIAN -DHAVE_WEAK_SYMBOLS -D__STDC_LIMIT_MACROS -D__
 # randombytes.c needs to pull in platform-specific implementation
 $(LSRC)/randombytes/randombytes.o: CFLAGS+=-DRANDOMBYTES_DEFAULT_IMPLEMENTATION
 
+ifeq ($(GCC_NOT_5_2_0), 1)
 # Temporary suppress "fallthrough" warnings until they are fixed in libsodium repo
 $(LSRC)/crypto_shorthash/siphash24/ref/shorthash_siphashx24_ref.o: CFLAGS += -Wno-implicit-fallthrough
 $(LSRC)/crypto_shorthash/siphash24/ref/shorthash_siphash24_ref.o: CFLAGS += -Wno-implicit-fallthrough
+endif
diff --git a/components/lwip/CMakeLists.txt b/components/lwip/CMakeLists.txt
index 068d8a5c4..794d5bc6a 100644
--- a/components/lwip/CMakeLists.txt
+++ b/components/lwip/CMakeLists.txt
@@ -126,3 +126,16 @@ register_component()
 
 # lots of LWIP source files evaluate macros that check address of stack variables
 component_compile_options(-Wno-address)
+
+if(GCC_NOT_5_2_0)
+    set_source_files_properties(
+        lwip/src/netif/ppp/ppp.c
+        PROPERTIES COMPILE_FLAGS
+        -Wno-uninitialized
+        )
+    set_source_files_properties(
+        lwip/src/netif/ppp/pppos.c
+        PROPERTIES COMPILE_FLAGS
+        -Wno-implicit-fallthrough
+        )
+endif()
diff --git a/components/lwip/component.mk b/components/lwip/component.mk
index d79cbd36c..e33ea7f36 100644
--- a/components/lwip/component.mk
+++ b/components/lwip/component.mk
@@ -28,3 +28,8 @@ ifdef CONFIG_PPP_SUPPORT
 endif
 
 CFLAGS += -Wno-address  # lots of LWIP source files evaluate macros that check address of stack variables
+
+ifeq ($(GCC_NOT_5_2_0), 1)
+lwip/src/netif/ppp/ppp.o: CFLAGS += -Wno-uninitialized
+lwip/src/netif/ppp/pppos.o: CFLAGS += -Wno-implicit-fallthrough
+endif
diff --git a/components/mqtt/CMakeLists.txt b/components/mqtt/CMakeLists.txt
index 27cf1e285..d100f80a0 100644
--- a/components/mqtt/CMakeLists.txt
+++ b/components/mqtt/CMakeLists.txt
@@ -9,3 +9,11 @@ set(COMPONENT_SRCS "esp-mqtt/mqtt_client.c"
 set(COMPONENT_REQUIRES lwip nghttp mbedtls tcp_transport)
 
 register_component()
+
+if(GCC_NOT_5_2_0)
+    # Temporary suppress "format-overflow" warning until we are fixed in esp-mqtt repo
+    set_source_files_properties(
+        esp-mqtt/lib/transport_ws.c
+        PROPERTIES COMPILE_FLAGS
+        -Wno-format-overflow)
+endif()
diff --git a/components/mqtt/component.mk b/components/mqtt/component.mk
index 19e498025..7c7715954 100644
--- a/components/mqtt/component.mk
+++ b/components/mqtt/component.mk
@@ -2,3 +2,7 @@ COMPONENT_SUBMODULES += esp-mqtt
 COMPONENT_ADD_INCLUDEDIRS := esp-mqtt/include
 COMPONENT_SRCDIRS :=  esp-mqtt esp-mqtt/lib
 COMPONENT_PRIV_INCLUDEDIRS := esp-mqtt/lib/include
+
+ifeq ($(GCC_NOT_5_2_0), 1)
+esp-mqtt/lib/transport_ws.o: CFLAGS += -Wno-format-overflow
+endif
diff --git a/components/vfs/vfs_uart.c b/components/vfs/vfs_uart.c
index e407de475..7a1fb5914 100644
--- a/components/vfs/vfs_uart.c
+++ b/components/vfs/vfs_uart.c
@@ -443,7 +443,9 @@ static int uart_tcsetattr(int fd, int optional_actions, const struct termios *p)
                 errno = EINVAL;
                 return -1;
             }
-            // intentional fall-through to the next case
+
+            /* FALLTHRU */
+
         case TCSAFLUSH:
             if (uart_flush_input(fd) != ESP_OK) {
                 errno = EINVAL;
diff --git a/docs/conf_common.py b/docs/conf_common.py
index 1ff9d351d..2832f83f4 100644
--- a/docs/conf_common.py
+++ b/docs/conf_common.py
@@ -89,6 +89,12 @@ def generate_version_specific_includes(app):
     call_with_python('../gen-version-specific-includes.py {} {}'.format(app.config.language, version_tmpdir))
     copy_if_modified(version_tmpdir, '{}/inc'.format(builddir))
 
+# Generate toolchain download links
+print("Generating toolchain download links")
+base_url = 'https://dl.espressif.com/dl/'
+toolchain_tmpdir = '{}/toolchain_inc'.format(builddir)
+call_with_python('../gen-toolchain-links.py ../../tools/toolchain_versions.mk {} {}'.format(base_url, toolchain_tmpdir))
+copy_if_modified(toolchain_tmpdir, '{}/inc'.format(builddir))
 
 # http://stackoverflow.com/questions/12772927/specifying-an-online-image-in-sphinx-restructuredtext-format
 # 
diff --git a/docs/en/get-started/linux-setup-scratch.rst b/docs/en/get-started/linux-setup-scratch.rst
index 72756852f..40b5e432f 100644
--- a/docs/en/get-started/linux-setup-scratch.rst
+++ b/docs/en/get-started/linux-setup-scratch.rst
@@ -49,12 +49,9 @@ Compile the Toolchain from Source
 
         TODO
 
-Download ``crosstool-NG`` and build it::
+Download ``crosstool-NG`` and build it:
 
-    cd ~/esp
-    git clone -b xtensa-1.22.x https://github.com/espressif/crosstool-NG.git
-    cd crosstool-NG
-    ./bootstrap && ./configure --enable-local && make install
+.. include:: /_build/inc/scratch-build-code.inc
 
 Build the toolchain::
 
diff --git a/docs/en/get-started/linux-setup.rst b/docs/en/get-started/linux-setup.rst
index 1cddf4284..00d024ac5 100644
--- a/docs/en/get-started/linux-setup.rst
+++ b/docs/en/get-started/linux-setup.rst
@@ -29,21 +29,27 @@ To compile with ESP-IDF you need to get the following packages:
 Toolchain Setup
 ===============
 
+.. include:: /_build/inc/download-links.inc
+
 ESP32 toolchain for Linux is available for download from Espressif website:
 
 - for 64-bit Linux:
 
-  https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-80-g6c4433a-5.2.0.tar.gz
+  |download_link_linux64|
 
 - for 32-bit Linux:
 
-  https://dl.espressif.com/dl/xtensa-esp32-elf-linux32-1.22.0-80-g6c4433a-5.2.0.tar.gz
+  |download_link_linux32|
 
-1.  Download this file, then extract it in ``~/esp`` directory::
+1.  Download this file, then extract it in ``~/esp`` directory:
 
-        mkdir -p ~/esp
-        cd ~/esp
-        tar -xzf ~/Downloads/xtensa-esp32-elf-linux64-1.22.0-80-g6c4433a-5.2.0.tar.gz
+    - for 64-bit Linux:
+
+      .. include:: /_build/inc/unpack-code-linux64.inc
+
+    - for 32-bit Linux:
+
+      .. include:: /_build/inc/unpack-code-linux32.inc
 
 .. _setup-linux-toolchain-add-it-to-path:
 
diff --git a/docs/en/get-started/macos-setup-scratch.rst b/docs/en/get-started/macos-setup-scratch.rst
index 731122723..f743d9995 100644
--- a/docs/en/get-started/macos-setup-scratch.rst
+++ b/docs/en/get-started/macos-setup-scratch.rst
@@ -44,12 +44,9 @@ Create a symlink to your work directory::
     cd ~/esp
     ln -s /Volumes/ctng crosstool-NG
 
-Download ``crosstool-NG`` and build it::
+Download ``crosstool-NG`` and build it:
 
-    cd ~/esp
-    git clone -b xtensa-1.22.x https://github.com/espressif/crosstool-NG.git
-    cd crosstool-NG
-    ./bootstrap && ./configure --enable-local && make install
+.. include:: /_build/inc/scratch-build-code.inc
 
 Build the toolchain::
 
diff --git a/docs/en/get-started/macos-setup.rst b/docs/en/get-started/macos-setup.rst
index 00e5be431..2708dc6e6 100644
--- a/docs/en/get-started/macos-setup.rst
+++ b/docs/en/get-started/macos-setup.rst
@@ -17,15 +17,15 @@ Install Prerequisites
 Toolchain Setup
 ===============
 
+.. include:: /_build/inc/download-links.inc
+
 ESP32 toolchain for macOS is available for download from Espressif website:
 
-https://dl.espressif.com/dl/xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz
+|download_link_osx|
 
-Download this file, then extract it in ``~/esp`` directory::
+Download this file, then extract it in ``~/esp`` directory:
 
-    mkdir -p ~/esp
-    cd ~/esp
-    tar -xzf ~/Downloads/xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz
+.. include:: /_build/inc/unpack-code-osx.inc
 
 .. _setup-macos-toolchain-add-it-to-path:
 
diff --git a/docs/en/get-started/windows-setup-scratch.rst b/docs/en/get-started/windows-setup-scratch.rst
index 4c772eeb3..fc64e2a23 100644
--- a/docs/en/get-started/windows-setup-scratch.rst
+++ b/docs/en/get-started/windows-setup-scratch.rst
@@ -76,9 +76,11 @@ Add this line to ``/etc/profile`` in the MSYS directory in order to permanently
 Alternative Setup: Just download a toolchain
 ============================================
 
+.. include:: /_build/inc/download-links.inc
+
 If you already have an MSYS2 install or want to do things differently, you can download just the toolchain here:
 
-https://dl.espressif.com/dl/xtensa-esp32-elf-win32-1.22.0-80-g6c4433a-5.2.0.zip
+|download_link_win32|
 
 .. note::
 
diff --git a/docs/gen-toolchain-links.py b/docs/gen-toolchain-links.py
new file mode 100644
index 000000000..10c2aeef9
--- /dev/null
+++ b/docs/gen-toolchain-links.py
@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# This script generates toolchain download links and toolchain unpacking
+# code snippets based on information found in $IDF_PATH/tools/toolchain_versions.mk
+#
+
+from __future__ import print_function
+
+import sys
+import os
+
+def main():
+    if len(sys.argv) != 4:
+        print("Usage: gen-toolchain-links.py <versions file> <base download URL> <output directory>")
+        sys.exit(1)
+
+    out_dir = sys.argv[3]
+    if not os.path.exists(out_dir):
+        print("Creating directory %s" % out_dir)
+        os.mkdir(out_dir)
+
+    base_url = sys.argv[2]
+
+    versions_file = sys.argv[1]
+    version_vars = {}
+    with open(versions_file) as f:
+        for line in f:
+            name, var = line.partition("=")[::2]
+            version_vars[name.strip()] = var.strip()
+
+    gcc_version = version_vars["CURRENT_TOOLCHAIN_GCC_VERSION"]
+    toolchain_desc = version_vars["CURRENT_TOOLCHAIN_COMMIT_DESC_SHORT"]
+
+    unpack_code_linux_macos = """
+::
+
+    mkdir -p ~/esp
+    cd ~/esp
+    tar -x{}f ~/Downloads/{}
+"""
+
+    scratch_build_code_linux_macos = """
+::
+
+    cd ~/esp
+    git clone -b xtensa-1.22.x https://github.com/espressif/crosstool-NG.git
+    cd crosstool-NG
+    ./bootstrap && ./configure --enable-local && make install
+"""
+
+    platform_info = [ ["linux64", "tar.gz", "z", unpack_code_linux_macos],
+                      ["linux32", "tar.gz", "z", unpack_code_linux_macos],
+                      ["osx", "tar.gz", "z", unpack_code_linux_macos],
+                      ["win32", "zip", None, None]]
+
+    with open(os.path.join(out_dir, 'download-links.inc'), "w") as links_file:
+        for p in platform_info:
+            platform_name = p[0]
+            extension = p[1]
+            unpack_cmd = p[2]
+            unpack_code = p[3]
+
+            archive_name = 'xtensa-esp32-elf-{}-{}-{}.{}'.format(
+                    platform_name, toolchain_desc, gcc_version, extension)
+            
+            print('.. |download_link_{}| replace:: {}{}'.format(
+                platform_name, base_url, archive_name), file=links_file)
+
+            if unpack_code is not None:
+                with open(os.path.join(out_dir, 'unpack-code-%s.inc' % platform_name), "w") as f:
+                    print(unpack_code.format(unpack_cmd, archive_name), file=f)
+
+    with open(os.path.join(out_dir, 'scratch-build-code.inc'), "w") as code_file:
+        print(scratch_build_code_linux_macos, file=code_file)
+
+if __name__ == "__main__":
+    main()
diff --git a/docs/zh_CN/get-started/linux-setup-scratch.rst b/docs/zh_CN/get-started/linux-setup-scratch.rst
index 732a37e4e..3610ce06f 100644
--- a/docs/zh_CN/get-started/linux-setup-scratch.rst
+++ b/docs/zh_CN/get-started/linux-setup-scratch.rst
@@ -48,12 +48,9 @@
 
         TODO
 
-下载 ``crosstool-NG`` 然后编译::
+下载 ``crosstool-NG`` 然后编译:
 
-    cd ~/esp
-    git clone -b xtensa-1.22.x https://github.com/espressif/crosstool-NG.git
-    cd crosstool-NG
-    ./bootstrap && ./configure --enable-local && make install
+.. include:: /_build/inc/scratch-build-code.inc
 
 编译工具链::
 
diff --git a/docs/zh_CN/get-started/linux-setup.rst b/docs/zh_CN/get-started/linux-setup.rst
index 28b4b3770..d1d658924 100644
--- a/docs/zh_CN/get-started/linux-setup.rst
+++ b/docs/zh_CN/get-started/linux-setup.rst
@@ -30,21 +30,27 @@ Linux 平台工具链的标准设置
 工具链的设置
 ===============
 
+.. include:: /_build/inc/download-links.inc
+
 Linux 版的 ESP32 工具链可以从 Espressif 的网站下载：
 
 - 64-bit Linux：
 
-  https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-80-g6c4433a-5.2.0.tar.gz
+  |download_link_linux64|
 
 - 32-bit Linux：
 
-  https://dl.espressif.com/dl/xtensa-esp32-elf-linux32-1.22.0-80-g6c4433a-5.2.0.tar.gz
+  |download_link_linux32|
 
-1. 下载完成后，将它解压到 ``~/esp`` 目录： ::
+1. 下载完成后，将它解压到 ``~/esp`` 目录： :
 
-        mkdir -p ~/esp
-        cd ~/esp
-        tar -xzf ~/Downloads/xtensa-esp32-elf-linux64-1.22.0-80-g6c4433a-5.2.0.tar.gz
+    - 64-bit Linux:
+
+      .. include:: /_build/inc/unpack-code-linux64.inc
+
+    - 32-bit Linux:
+
+      .. include:: /_build/inc/unpack-code-linux32.inc
 
 .. _setup-linux-toolchain-add-it-to-path:  
 
diff --git a/docs/zh_CN/get-started/macos-setup-scratch.rst b/docs/zh_CN/get-started/macos-setup-scratch.rst
index 5b0ab044c..30d7d7f73 100644
--- a/docs/zh_CN/get-started/macos-setup-scratch.rst
+++ b/docs/zh_CN/get-started/macos-setup-scratch.rst
@@ -44,12 +44,9 @@
     cd ~/esp
     ln -s /Volumes/ctng crosstool-NG
 
-下载 ``crosstool-NG`` 然后编译::
+下载 ``crosstool-NG`` 然后编译:
 
-    cd ~/esp
-    git clone -b xtensa-1.22.x https://github.com/espressif/crosstool-NG.git
-    cd crosstool-NG
-    ./bootstrap && ./configure --enable-local && make install
+.. include:: /_build/inc/scratch-build-code.inc
 
 编译工具链::
 
diff --git a/docs/zh_CN/get-started/macos-setup.rst b/docs/zh_CN/get-started/macos-setup.rst
index 255a792a7..781a6d746 100644
--- a/docs/zh_CN/get-started/macos-setup.rst
+++ b/docs/zh_CN/get-started/macos-setup.rst
@@ -19,15 +19,15 @@
 安装工具链
 ===============
 
+.. include:: /_build/inc/download-links.inc
+
 Mac OS 版本的 ESP32 工具链可以从以下地址下载：
 
-https://dl.espressif.com/dl/xtensa-esp32-elf-osx-1.22.0-75-gbaf03c2-5.2.0.tar.gz
+|download_link_osx|
 
-下载压缩文件之后，解压到 ``~/esp`` 目录中::
+下载压缩文件之后，解压到 ``~/esp`` 目录中:
 
-    mkdir -p ~/esp
-    cd ~/esp
-    tar -xzf ~/Downloads/xtensa-esp32-elf-osx-1.22.0-75-gbaf03c2-5.2.0.tar.gz
+.. include:: /_build/inc/unpack-code-osx.inc
 
 .. _setup-macos-toolchain-add-it-to-path:
 
diff --git a/examples/bluetooth/ble_hid_device_demo/main/CMakeLists.txt b/examples/bluetooth/ble_hid_device_demo/main/CMakeLists.txt
index cada4eb3c..1969d3995 100644
--- a/examples/bluetooth/ble_hid_device_demo/main/CMakeLists.txt
+++ b/examples/bluetooth/ble_hid_device_demo/main/CMakeLists.txt
@@ -5,3 +5,7 @@ set(COMPONENT_SRCS "ble_hidd_demo_main.c"
 set(COMPONENT_ADD_INCLUDEDIRS ".")
 
 register_component()
+
+if(GCC_NOT_5_2_0)
+    component_compile_options(-Wno-unused-const-variable)
+endif()
diff --git a/examples/bluetooth/ble_hid_device_demo/main/component.mk b/examples/bluetooth/ble_hid_device_demo/main/component.mk
index 48adb595c..4fa5a1b02 100644
--- a/examples/bluetooth/ble_hid_device_demo/main/component.mk
+++ b/examples/bluetooth/ble_hid_device_demo/main/component.mk
@@ -1,10 +1,7 @@
 #
 # Main Makefile. This is basically the same as a component makefile.
 #
-# This Makefile should, at the very least, just include $(SDK_PATH)/make/component_common.mk. By default, 
-# this will take the sources in the src/ directory, compile them and link them into 
-# lib(subdirectory_name).a in the build directory. This behaviour is entirely configurable,
-# please read the ESP-IDF documents if you need to do this.
-#
 
-# include $(IDF_PATH)/make/component_common.mk
+ifeq ($(GCC_NOT_5_2_0), 1)
+hid_device_le_prf.o: CFLAGS += -Wno-unused-const-variable 
+endif
\ No newline at end of file
diff --git a/examples/peripherals/sdio/slave/main/app_main.c b/examples/peripherals/sdio/slave/main/app_main.c
index 4f6eeddbc..ced905d90 100644
--- a/examples/peripherals/sdio/slave/main/app_main.c
+++ b/examples/peripherals/sdio/slave/main/app_main.c
@@ -130,7 +130,7 @@ static esp_err_t task_write_reg()
         if (i >= 28 && i <= 31) continue;
         sdio_slave_write_reg(i, read+3*i);
     }
-    uint8_t reg[64];
+    uint8_t reg[64] = {0};
     for (int i = 0; i < 64; i++) {
         //skip interrupt regs.
         if (i >= 28 && i <= 31) continue;
diff --git a/examples/system/gcov/README.md b/examples/system/gcov/README.md
index 1115146cc..d1c7126b1 100644
--- a/examples/system/gcov/README.md
+++ b/examples/system/gcov/README.md
@@ -157,4 +157,7 @@ Writing directory view page.
 Overall coverage rate:
   lines......: 90.0% (18 of 20 lines)
   functions..: 100.0% (3 of 3 functions)
-```
\ No newline at end of file
+```
+
+NOTE: Since `lcov` tool is not part of GCC bundle it can happen that format of GCOV binary data has been changed and your local version of `lcov` fails to understand it.
+So it always better to use the latest `lcov` version from [LCOV repo](https://github.com/linux-test-project/lcov).
\ No newline at end of file
diff --git a/make/project.mk b/make/project.mk
index 364f72970..71d86d316 100644
--- a/make/project.mk
+++ b/make/project.mk
@@ -277,6 +277,22 @@ COMMON_WARNING_FLAGS = -Wall -Werror=all \
 	-Wextra \
 	-Wno-unused-parameter -Wno-sign-compare
 
+ifdef CONFIG_DISABLE_GCC8_WARNINGS
+COMMON_WARNING_FLAGS += -Wno-parentheses \
+	-Wno-sizeof-pointer-memaccess \
+	-Wno-clobbered \
+	-Wno-format-overflow \
+	-Wno-stringop-truncation \
+	-Wno-misleading-indentation \
+	-Wno-cast-function-type \
+	-Wno-implicit-fallthrough \
+	-Wno-unused-const-variable \
+	-Wno-switch-unreachable \
+	-Wno-format-truncation \
+	-Wno-memset-elt-size \
+	-Wno-int-in-bool-context
+endif
+
 ifdef CONFIG_WARN_WRITE_STRINGS
 COMMON_WARNING_FLAGS += -Wwrite-strings
 endif #CONFIG_WARN_WRITE_STRINGS
@@ -376,6 +392,14 @@ OBJCOPY := $(call dequote,$(CONFIG_TOOLPREFIX))objcopy
 SIZE := $(call dequote,$(CONFIG_TOOLPREFIX))size
 export CC CXX LD AR OBJCOPY SIZE
 
+COMPILER_VERSION_STR := $(shell $(CC) -dumpversion)
+COMPILER_VERSION_NUM := $(subst .,,$(COMPILER_VERSION_STR))
+GCC_NOT_5_2_0 := $(shell expr $(COMPILER_VERSION_STR) != "5.2.0")
+export COMPILER_VERSION_STR COMPILER_VERSION_NUM GCC_NOT_5_2_0
+
+CPPFLAGS += -DGCC_NOT_5_2_0=$(GCC_NOT_5_2_0)
+export CPPFLAGS
+
 PYTHON=$(call dequote,$(CONFIG_PYTHON))
 
 # the app is the main executable built by the project
@@ -562,28 +586,41 @@ print_flash_cmd: partition_table_get_info blank_ota_data
 
 # Check toolchain version using the output of xtensa-esp32-elf-gcc --version command.
 # The output normally looks as follows
-#     xtensa-esp32-elf-gcc (crosstool-NG crosstool-ng-1.22.0-59-ga194053) 4.8.5
-# The part in brackets is extracted into TOOLCHAIN_COMMIT_DESC variable,
-# the part after the brackets is extracted into TOOLCHAIN_GCC_VER.
+#     xtensa-esp32-elf-gcc (crosstool-NG crosstool-ng-1.22.0-80-g6c4433a) 5.2.0
+# The part in brackets is extracted into TOOLCHAIN_COMMIT_DESC variable
 ifdef CONFIG_TOOLPREFIX
 ifndef MAKE_RESTARTS
-TOOLCHAIN_COMMIT_DESC := $(shell $(CC) --version | sed -E -n 's|.*crosstool-ng-([0-9]+).([0-9]+).([0-9]+)-([0-9]+)-g([0-9a-f]{7}).*|\1.\2.\3-\4-g\5|gp')
-TOOLCHAIN_GCC_VER := $(shell $(CC) --version | sed -E -n 's|xtensa-esp32-elf-gcc.*\ \(.*\)\ (.*)|\1|gp')
+
+TOOLCHAIN_HEADER := $(shell $(CC) --version | head -1)
+TOOLCHAIN_PATH := $(shell which $(CC))
+TOOLCHAIN_COMMIT_DESC := $(shell $(CC) --version | sed -E -n 's|.*\(crosstool-NG (.*)\).*|\1|gp')
+TOOLCHAIN_GCC_VER := $(COMPILER_VERSION_STR)
 
 # Officially supported version(s)
-SUPPORTED_TOOLCHAIN_COMMIT_DESC := 1.22.0-80-g6c4433a
-SUPPORTED_TOOLCHAIN_GCC_VERSIONS := 5.2.0
+include $(IDF_PATH)/tools/toolchain_versions.mk
+
+ifndef IS_BOOTLOADER_BUILD
+$(info Toolchain path: $(TOOLCHAIN_PATH))
+endif
 
 ifdef TOOLCHAIN_COMMIT_DESC
 ifneq ($(TOOLCHAIN_COMMIT_DESC), $(SUPPORTED_TOOLCHAIN_COMMIT_DESC))
 $(info WARNING: Toolchain version is not supported: $(TOOLCHAIN_COMMIT_DESC))
 $(info Expected to see version: $(SUPPORTED_TOOLCHAIN_COMMIT_DESC))
 $(info Please check ESP-IDF setup instructions and update the toolchain, or proceed at your own risk.)
+else
+ifndef IS_BOOTLOADER_BUILD
+$(info Toolchain version: $(TOOLCHAIN_COMMIT_DESC))
+endif
 endif
 ifeq (,$(findstring $(TOOLCHAIN_GCC_VER), $(SUPPORTED_TOOLCHAIN_GCC_VERSIONS)))
 $(info WARNING: Compiler version is not supported: $(TOOLCHAIN_GCC_VER))
 $(info Expected to see version(s): $(SUPPORTED_TOOLCHAIN_GCC_VERSIONS))
 $(info Please check ESP-IDF setup instructions and update the toolchain, or proceed at your own risk.)
+else
+ifndef IS_BOOTLOADER_BUILD
+$(info Compiler version: $(TOOLCHAIN_GCC_VER))
+endif
 endif
 else
 $(info WARNING: Failed to find Xtensa toolchain, may need to alter PATH or set one in the configuration menu)
diff --git a/tools/ci/build_examples.sh b/tools/ci/build_examples.sh
index a36ab8f80..81576bf55 100755
--- a/tools/ci/build_examples.sh
+++ b/tools/ci/build_examples.sh
@@ -157,8 +157,18 @@ echo -e "\nFound issues:"
 #       Ignore the next messages:
 # "error.o" or "-Werror" in compiler's command line
 # "reassigning to symbol" or "changes choice state" in sdkconfig
-sort -u "${LOG_SUSPECTED}" | \
-grep -v "library/error\.o\|\ -Werror\|error\.d\|reassigning to symbol\|changes choice state" \
+# 'Compiler and toochain versions is not supported' from make/project.mk
+IGNORE_WARNS="\
+library/error\.o\
+\|\ -Werror\
+\|error\.d\
+\|reassigning to symbol\
+\|changes choice state\
+\|Compiler version is not supported\
+\|Toolchain version is not supported\
+"
+
+sort -u "${LOG_SUSPECTED}" | grep -v "${IGNORE_WARNS}" \
     && RESULT=$RESULT_ISSUES \
     || echo -e "\tNone"
 
diff --git a/tools/ci/build_examples_cmake.sh b/tools/ci/build_examples_cmake.sh
index 39840a385..849943b93 100755
--- a/tools/ci/build_examples_cmake.sh
+++ b/tools/ci/build_examples_cmake.sh
@@ -160,8 +160,17 @@ echo -e "\nFound issues:"
 #       Ignore the next messages:
 # "error.o" or "-Werror" in compiler's command line
 # "reassigning to symbol" or "changes choice state" in sdkconfig
-sort -u "${LOG_SUSPECTED}" | \
-grep -v "library/error.o\|\ -Werror\|reassigning to symbol\|changes choice state" \
+# 'Compiler and toochain versions is not supported' from crosstool_version_check.cmake
+IGNORE_WARNS="\
+library/error\.o\
+\|\ -Werror\
+\|error\.d\
+\|reassigning to symbol\
+\|changes choice state\
+\|crosstool_version_check\.cmake\
+"
+
+sort -u "${LOG_SUSPECTED}" | grep -v "${IGNORE_WARNS}" \
     && RESULT=$RESULT_ISSUES \
     || echo -e "\tNone"
 
diff --git a/tools/cmake/crosstool_version_check.cmake b/tools/cmake/crosstool_version_check.cmake
index d572a82a7..1180fc029 100644
--- a/tools/cmake/crosstool_version_check.cmake
+++ b/tools/cmake/crosstool_version_check.cmake
@@ -17,7 +17,6 @@ function(crosstool_version_check expected_ctng_version)
         OUTPUT_QUIET)
 
     string(REGEX MATCH "crosstool-ng-[0-9a-g\\.-]+" ctng_version "${toolchain_stderr}")
-    string(REPLACE "crosstool-ng-" "" ctng_version "${ctng_version}")
     # We use FIND to match version instead of STREQUAL because some toolchains are built
     # with longer git hash strings than others. This will match any version which starts with
     # the expected version string.
@@ -30,3 +29,21 @@ function(crosstool_version_check expected_ctng_version)
             "doesn't match supported version ${expected_ctng_version}. ${ctng_version_warning}")
     endif()
 endfunction()
+
+function(get_expected_ctng_version _toolchain_ver _gcc_ver)
+    file(STRINGS ${IDF_PATH}/tools/toolchain_versions.mk config_contents)
+    foreach(name_and_value ${config_contents})
+        # Strip spaces
+        string(REPLACE " " "" name_and_value ${name_and_value})
+        # Find variable name
+        string(REGEX MATCH "^[^=]+" name ${name_and_value})
+        # Find the value
+        string(REPLACE "${name}=" "" value ${name_and_value})
+        # Getting values
+        if("${name}" STREQUAL "SUPPORTED_TOOLCHAIN_COMMIT_DESC")
+            set("${_toolchain_ver}" "${value}" PARENT_SCOPE)
+        elseif("${name}" STREQUAL "SUPPORTED_TOOLCHAIN_GCC_VERSIONS")
+            set(${_gcc_ver} "${value}" PARENT_SCOPE)
+        endif()
+    endforeach()
+endfunction()
diff --git a/tools/cmake/idf_functions.cmake b/tools/cmake/idf_functions.cmake
index d68eabf62..f84deb70a 100644
--- a/tools/cmake/idf_functions.cmake
+++ b/tools/cmake/idf_functions.cmake
@@ -40,6 +40,13 @@ macro(idf_set_global_variables)
 
     # path to idf.py tool
     set(IDFTOOL ${PYTHON} "${IDF_PATH}/tools/idf.py")
+
+    # Temporary trick to support both gcc5 and gcc8 builds
+    if(CMAKE_C_COMPILER_VERSION VERSION_EQUAL 5.2.0)
+        set(GCC_NOT_5_2_0 0)
+    else()
+        set(GCC_NOT_5_2_0 1)
+    endif()
 endmacro()
 
 # Add all the IDF global compiler & preprocessor options
@@ -86,6 +93,30 @@ function(idf_set_global_compiler_options)
         -Wno-old-style-declaration
         )
 
+    if(CONFIG_DISABLE_GCC8_WARNINGS)
+        add_compile_options(
+            -Wno-parentheses
+            -Wno-sizeof-pointer-memaccess
+            -Wno-clobbered
+        )
+
+        # doesn't use GCC_NOT_5_2_0 because idf_set_global_variables was not called before
+        if(NOT CMAKE_C_COMPILER_VERSION VERSION_EQUAL 5.2.0)
+            add_compile_options(
+                -Wno-format-overflow
+                -Wno-stringop-truncation
+                -Wno-misleading-indentation
+                -Wno-cast-function-type
+                -Wno-implicit-fallthrough
+                -Wno-unused-const-variable
+                -Wno-switch-unreachable
+                -Wno-format-truncation
+                -Wno-memset-elt-size
+                -Wno-int-in-bool-context
+            )
+        endif()
+    endif()
+
     # Stack protection
     if(NOT BOOTLOADER_BUILD)
         if(CONFIG_STACK_CHECK_NORM)
@@ -114,6 +145,8 @@ function(idf_set_global_compiler_options)
         endif()
     endif()
 
+    # Temporary trick to support both gcc5 and gcc8 builds
+    add_definitions(-DGCC_NOT_5_2_0=${GCC_NOT_5_2_0})
 endfunction()
 
 
@@ -134,8 +167,9 @@ function(idf_verify_environment)
     # Warn if the toolchain version doesn't match
     #
     # TODO: make these platform-specific for diff toolchains
-    gcc_version_check("5.2.0")
-    crosstool_version_check("1.22.0-80-g6c4433a")
+    get_expected_ctng_version(expected_toolchain expected_gcc)
+    gcc_version_check("${expected_gcc}")
+    crosstool_version_check("${expected_toolchain}")
 
 endfunction()
 
diff --git a/tools/toolchain_versions.mk b/tools/toolchain_versions.mk
new file mode 100644
index 000000000..cf74ef5ec
--- /dev/null
+++ b/tools/toolchain_versions.mk
@@ -0,0 +1,6 @@
+SUPPORTED_TOOLCHAIN_COMMIT_DESC = crosstool-ng-1.22.0-80-g6c4433a
+SUPPORTED_TOOLCHAIN_GCC_VERSIONS = 5.2.0
+
+CURRENT_TOOLCHAIN_COMMIT_DESC = crosstool-ng-1.22.0-80-g6c4433a
+CURRENT_TOOLCHAIN_COMMIT_DESC_SHORT = 1.22.0-80-g6c4433a
+CURRENT_TOOLCHAIN_GCC_VERSION = 5.2.0
diff --git a/tools/unit-test-app/components/unity/component.mk b/tools/unit-test-app/components/unity/component.mk
index ebd7a7d59..c3c44cc0c 100644
--- a/tools/unit-test-app/components/unity/component.mk
+++ b/tools/unit-test-app/components/unity/component.mk
@@ -1,3 +1,7 @@
 #
 # Component Makefile
 #
+
+ifeq ($(GCC_NOT_5_2_0), 1)
+unity.o: CFLAGS += -Wno-unused-const-variable
+endif
\ No newline at end of file