esp-idf/tools/cmake/toolchain-esp32.cmake

set(CMAKE_SYSTEM_NAME Generic)

set(CMAKE_C_COMPILER xtensa-esp32-elf-gcc)
set(CMAKE_CXX_COMPILER xtensa-esp32-elf-g++)
set(CMAKE_ASM_COMPILER xtensa-esp32-elf-gcc)

set(CMAKE_C_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C Compiler Base Flags")
set(CMAKE_CXX_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C++ Compiler Base Flags")

# Can be removed after gcc 5.2.0 support is removed (ref GCC_NOT_5_2_0)
set(CMAKE_EXE_LINKER_FLAGS "-nostdlib" CACHE STRING "Linker Base Flags")
cmake: Use cmake_lint project, tidy up all CMake source files 2018-02-27 15:45:30 +11:00			`set(CMAKE_SYSTEM_NAME Generic)`

			`set(CMAKE_C_COMPILER xtensa-esp32-elf-gcc)`
			`set(CMAKE_CXX_COMPILER xtensa-esp32-elf-g++)`
			`set(CMAKE_ASM_COMPILER xtensa-esp32-elf-gcc)`

esp32: disable -Wframe-address Since the behavior is well defined on Xtensa with Window ABI we can suppress a frame-address warning. Also fix the CMAKE_C*_FLAGS parsing. 2019-04-09 10:14:31 +07:00			`set(CMAKE_C_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C Compiler Base Flags")`
			`set(CMAKE_CXX_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C++ Compiler Base Flags")`
cmake: For gcc8 use linker to find paths to libc, libm, libstdc++, etc Removes the need to know/guess the paths to these libraries. Once we are gcc 8 only, we can remove -nostdlib and no additional arguments are needed for system libraries. The catch is: any time IDF overrides a symbol in the toolchain sysroot, we need an undefined linker marker to make sure this symbol is seen by linker. 2019-04-15 13:45:08 +10:00
			`# Can be removed after gcc 5.2.0 support is removed (ref GCC_NOT_5_2_0)`
			`set(CMAKE_EXE_LINKER_FLAGS "-nostdlib" CACHE STRING "Linker Base Flags")`