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Build: CMake compiler flags will be set, regardless of the cache status

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Defining CMake variables from the command-line or from another CMake project,
such as `-DCMAKE_C_FLAGS= -DCMAKE_CXX_FLAGS=`, caused a link failure as ESP
CMake was unable to set its proper compilation flags.
Additional CMake compiler flags can now be provided by another project.

* Closes https://github.com/espressif/esp-idf/issues/7507
This commit is contained in:
Omar Chebib
2021-09-29 18:46:35 +08:00
parent 961407ca42
commit 0baf2c43cc
12 changed files with 67 additions and 26 deletions
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10
tools/cmake/toolchain-esp32h2.cmake
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@@ -4,6 +4,10 @@ set(CMAKE_C_COMPILER riscv32-esp-elf-gcc)
set(CMAKE_CXX_COMPILER riscv32-esp-elf-g++)
set(CMAKE_ASM_COMPILER riscv32-esp-elf-gcc)
set(CMAKE_C_FLAGS "-march=rv32imc" CACHE STRING "C Compiler Base Flags")
set(CMAKE_CXX_FLAGS "-march=rv32imc" CACHE STRING "C++ Compiler Base Flags")
set(CMAKE_EXE_LINKER_FLAGS "-nostartfiles -march=rv32imc --specs=nosys.specs" CACHE STRING "Linker Base Flags")
list(APPEND compile_options "-march=rv32imc")
# Option `--specs` must only be defined ONCE in the final linker command, else GCC will complain:
# "attempt to rename spec 'link_gcc_c_sequence' to already defined spec 'nosys_link_gcc_c_sequence'"
# so unset `link_options` first.
unset(link_options)
list(APPEND link_options "-nostartfiles" "-march=rv32imc" "--specs=nosys.specs")