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cmake: allow selection of clang based toolchain

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This is an experimental feature intended at the moment for ESP-IDF
developers only.

If IDF_TOOLCHAIN=clang environment variable or CMake variable is set,
use toolchain-clang-esp32xx.cmake instead of toolchain-esp32xx.cmake.

These changes aren't sufficient to actually build any IDF project with
clang; subsequent commits add a few workarounds required to do this.

Toolchain files are added for esp32 and esp32s2, which are the targets
supported in our llvm-project fork at the moment.
This commit is contained in:
Ivan Grokhotkov 2021-09-10 18:47:46 +02:00
parent 54e4aa9781
commit 14e600801e
3 changed files with 59 additions and 1 deletions
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28
tools/cmake/targets.cmake
View File

@ -47,8 +47,34 @@ endfunction()
#
macro(__target_set_toolchain)
idf_build_get_property(idf_path IDF_PATH)
# See if Clang toolchain should be used
set(env_idf_toolchain $ENV{IDF_TOOLCHAIN})
if(NOT env_idf_toolchain)
# IDF_TOOLCHAIN not set in environment, see if it is set in cache
if(IDF_TOOLCHAIN)
set(env_idf_toolchain ${IDF_TOOLCHAIN})
else()
set(env_idf_toolchain gcc)
endif()
else()
# IDF_TOOLCHAIN set both in environment and in cache, must be the same
if(NOT ${IDF_TOOLCHAIN} STREQUAL ${env_idf_toolchain})
message(FATAL_ERROR "IDF_TOOLCHAIN in CMake cache does not match "
"IDF_TOOLCHAIN environment variable. To change the toolchain, clear "
"the build directory and sdkconfig file, and build the project again")
endif()
endif()
# Finally, set IDF_TOOLCHAIN in cache
set(IDF_TOOLCHAIN ${env_idf_toolchain} CACHE STRING "IDF Build Toolchain Type")
if(${env_idf_toolchain} STREQUAL "clang")
set(toolchain_type "clang-")
endif()
# First try to load the toolchain file from the tools/cmake/directory of IDF
set(toolchain_file_global ${idf_path}/tools/cmake/toolchain-${IDF_TARGET}.cmake)
set(toolchain_file_global ${idf_path}/tools/cmake/toolchain-${toolchain_type}${IDF_TARGET}.cmake)
if(EXISTS ${toolchain_file_global})
set(CMAKE_TOOLCHAIN_FILE ${toolchain_file_global})
else()

16
tools/cmake/toolchain-clang-esp32.cmake Normal file
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@ -0,0 +1,16 @@
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_C_COMPILER clang)
set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_ASM_COMPILER clang)
set(CMAKE_AR xtensa-esp32-elf-ar)
set(CMAKE_RANLIB xtensa-esp32-elf-gcc-ranlib)
set(CMAKE_OBJDUMP xtensa-esp32-elf-objdump)
# -freestanding is a hack to force Clang to use its own stdatomic.h,
# without falling back to the (incompatible) GCC stdatomic.h
# https://github.com/espressif/llvm-project/blob/d9341b81/clang/lib/Headers/stdatomic.h#L13-L18
set(CMAKE_C_FLAGS "--target=xtensa -mcpu=esp32 -ffreestanding" CACHE STRING "C Compiler Base Flags")
set(CMAKE_CXX_FLAGS "--target=xtensa -mcpu=esp32 -ffreestanding" CACHE STRING "C++ Compiler Base Flags")
set(CMAKE_ASM_FLAGS "--target=xtensa -mcpu=esp32" CACHE STRING "Assembler Base Flags")

16
tools/cmake/toolchain-clang-esp32s2.cmake Normal file
View File

@ -0,0 +1,16 @@
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_C_COMPILER clang)
set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_ASM_COMPILER clang)
set(CMAKE_AR xtensa-esp32-elf-ar)
set(CMAKE_RANLIB xtensa-esp32-elf-gcc-ranlib)
set(CMAKE_OBJDUMP xtensa-esp32-elf-objdump)
# -freestanding is a hack to force Clang to use its own stdatomic.h,
# without falling back to the (incompatible) GCC stdatomic.h
# https://github.com/espressif/llvm-project/blob/d9341b81/clang/lib/Headers/stdatomic.h#L13-L18
set(CMAKE_C_FLAGS "--target=xtensa -mcpu=esp32s2 -ffreestanding" CACHE STRING "C Compiler Base Flags")
set(CMAKE_CXX_FLAGS "--target=xtensa -mcpu=esp32s2 -ffreestanding" CACHE STRING "C++ Compiler Base Flags")
set(CMAKE_ASM_FLAGS "--target=xtensa -mcpu=esp32s2" CACHE STRING "Assembler Base Flags")