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cmake: For gcc8 use linker to find paths to libc, libm, libstdc++, etc

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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.
This commit is contained in:
Angus Gratton
2019-04-15 13:45:08 +10:00
committed by Renz Christian Bagaporo
parent 2c12080049
commit 22514c1dd9
13 changed files with 83 additions and 41 deletions
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tools/cmake/toolchain-esp32.cmake
+3 -1
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@@ -4,6 +4,8 @@ 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_EXE_LINKER_FLAGS "-nostdlib" CACHE STRING "Linker Base Flags")
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")