cmake: add spaces2list for COMPONENT_SRCS

According to ESP-IDF Cmake build system document, COMPONENT_SRCS should support using spaces to sperate source files.

Closes https://github.com/espressif/esp-idf/issues/3130

tools/ci/test_build_system_cmake.sh

@@ -120,6 +120,14 @@ function run_tests()
     version+=$(git describe --always --tags --dirty)
     grep "${version}" log.log || failure "Project version should have a hash commit"
 
+    print_status "Can set COMPONENT_SRCS with spaces"
+    clean_build_dir
+    touch main/main2.c
+    sed -i 's/^set(COMPONENT_SRCS.*/set(COMPONENT_SRCS "main.c main2.c")/' main/CMakeLists.txt
+    idf.py build || failure "Set COMPONENT_SRCS with spaces build failed"
+    git checkout -- main/CMakeLists.txt
+    rm main/main2.c
+
     print_status "Moving BUILD_DIR_BASE out of tree"
     clean_build_dir
     OUTOFTREE_BUILD=${TESTDIR}/alt_build

tools/cmake/components.cmake

@@ -17,6 +17,7 @@ endfunction()
 function(register_component)
     get_filename_component(component_dir ${CMAKE_CURRENT_LIST_FILE} DIRECTORY)
 
+    spaces2list(COMPONENT_SRCS)
     spaces2list(COMPONENT_SRCDIRS)
     spaces2list(COMPONENT_ADD_INCLUDEDIRS)
     spaces2list(COMPONENT_SRCEXCLUDE)