499d087c91
Ref. https://github.com/espressif/esp-idf/issues/1684 This change allows RTTI to be enabled in menuconfig. For full RTTI support, libstdc++.a in the toolchain should be built without -fno-rtti, as it is done now. Generally if libstdc++.a is built with RTTI, applications which do not use RTTI (and build with -fno-rtti) could still include typeinfo structures referenced from STL classes’ vtables. This change works around this, by moving all typeinfo structures from libstdc++.a into a non-loadable section, placed into a non-existent memory region starting at address 0. This can be done because when the application is compiled with -fno-rtti, typeinfo structures are not used at run time. This way, typeinfo structures do not contribute to the application binary size. If the application is build with RTTI support, typeinfo structures are linked into the application .rodata section as usual. Note that this commit does not actually enable RTTI support. The respective Kconfig option is hidden, and will be made visible when the toolchain is updated.
50 lines
1.9 KiB
Makefile
50 lines
1.9 KiB
Makefile
#
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# Component Makefile
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#
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COMPONENT_SRCDIRS := .
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ifdef CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
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# This linker script must come before esp32.project.ld
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LINKER_SCRIPTS += esp32.extram.bss.ld
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endif
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ifndef CONFIG_COMPILER_CXX_RTTI
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# This linker script must come before esp32.project.ld
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LINKER_SCRIPTS += esp32.discard-rtti.ld
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endif
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# Linker scripts used to link the final application.
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# Warning: These linker scripts are only used when the normal app is compiled; the bootloader
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# specifies its own scripts.
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LINKER_SCRIPTS += $(COMPONENT_BUILD_DIR)/esp32.project.ld esp32.peripherals.ld
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# ld_include_panic_highint_hdl is added as an undefined symbol because otherwise the
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# linker will ignore panic_highint_hdl.S as it has no other files depending on any
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# symbols in it.
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COMPONENT_ADD_LDFLAGS += -L $(COMPONENT_PATH)/ld \
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-T esp32_out.ld \
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-u ld_include_panic_highint_hdl \
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$(addprefix -T ,$(LINKER_SCRIPTS)) \
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COMPONENT_ADD_LDFRAGMENTS += ld/esp32_fragments.lf linker.lf
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# final linking of project ELF depends on all binary libraries, and
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# all linker scripts (except esp32_out.ld, as this is code generated here.)
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COMPONENT_ADD_LINKER_DEPS := $(addprefix ld/, $(filter-out $(COMPONENT_BUILD_DIR)/esp32.project.ld, $(LINKER_SCRIPTS))) \
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$(COMPONENT_BUILD_DIR)/esp32.project.ld
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# Preprocess esp32.ld linker script into esp32_out.ld
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#
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# The library doesn't really depend on esp32_out.ld, but it
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# saves us from having to add the target to a Makefile.projbuild
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$(COMPONENT_LIBRARY): esp32_out.ld
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esp32_out.ld: $(COMPONENT_PATH)/ld/esp32.ld ../include/sdkconfig.h
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$(CC) -I ../include -C -P -x c -E $< -o $@
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COMPONENT_EXTRA_CLEAN := esp32_out.ld $(COMPONENT_BUILD_DIR)/esp32.project.ld
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# disable stack protection in files which are involved in initialization of that feature
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cpu_start.o: CFLAGS := $(filter-out -fstack-protector%, $(CFLAGS))
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