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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 b085cd2821
commit 8e7ee9ff26
11 changed files with 60 additions and 23 deletions
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8
CMakeLists.txt
View File

@ -7,11 +7,8 @@ if(CMAKE_CURRENT_LIST_DIR STREQUAL CMAKE_SOURCE_DIR)
"again.")
endif()
unset(compile_options)
unset(c_compile_options)
unset(cxx_compile_options)
unset(compile_definitions)
unset(link_options)
# Variables compile_options, c_compile_options, cxx_compile_options, compile_definitions, link_options shall
# not be unset as they may already contain flags, set by toolchain-TARGET.cmake files.
# Add the following build specifications here, since these seem to be dependent
# on config values on the root Kconfig.
@ -184,6 +181,7 @@ endif()
idf_build_set_property(COMPILE_OPTIONS "${compile_options}" APPEND)
idf_build_set_property(C_COMPILE_OPTIONS "${c_compile_options}" APPEND)
idf_build_set_property(CXX_COMPILE_OPTIONS "${cxx_compile_options}" APPEND)
idf_build_set_property(ASM_COMPILE_OPTIONS "${asm_compile_options}" APPEND)
idf_build_set_property(COMPILE_DEFINITIONS "${compile_definitions}" APPEND)
idf_build_set_property(LINK_OPTIONS "${link_options}" APPEND)

18
tools/ci/test_build_system_cmake.sh
View File

@ -354,6 +354,24 @@ function run_tests()
rm sdkconfig
rm sdkconfig.defaults
print_status "Compiler flags on build command line are taken into account"
clean_build_dir
# Backup original source file
cp main/main.c main/main.c.bak
# Alter source file to check user flag
echo -e "\n#ifndef USER_FLAG \n \
#error \"USER_FLAG is not defined!\" \n \
#endif\n" >> main/main.c
idf.py build -DCMAKE_C_FLAGS=-DUSER_FLAG || failure "User flags should have been taken into account"
# Restore original file
mv main/main.c.bak main/main.c
print_status "Compiler flags cannot be overwritten"
clean_build_dir
# If the compiler flags are overriden, the following build command will
# cause issues at link time.
idf.py build -DCMAKE_C_FLAGS= -DCMAKE_CXX_FLAGS= || failure "CMake compiler flags have been overriden"
# the next tests use the esp32s2 target
export other_target=esp32s2

2
tools/cmake/component.cmake
View File

@ -442,12 +442,14 @@ function(idf_component_register)
idf_build_get_property(compile_options COMPILE_OPTIONS GENERATOR_EXPRESSION)
idf_build_get_property(c_compile_options C_COMPILE_OPTIONS GENERATOR_EXPRESSION)
idf_build_get_property(cxx_compile_options CXX_COMPILE_OPTIONS GENERATOR_EXPRESSION)
idf_build_get_property(asm_compile_options ASM_COMPILE_OPTIONS GENERATOR_EXPRESSION)
idf_build_get_property(common_reqs ___COMPONENT_REQUIRES_COMMON)
include_directories("${include_directories}")
add_compile_options("${compile_options}")
add_c_compile_options("${c_compile_options}")
add_cxx_compile_options("${cxx_compile_options}")
add_asm_compile_options("${asm_compile_options}")
# Unfortunately add_definitions() does not support generator expressions. A new command
# add_compile_definition() does but is only available on CMake 3.12 or newer. This uses

8
tools/cmake/toolchain-clang-esp32.cmake
View File

@ -1,3 +1,5 @@
include($ENV{IDF_PATH}/tools/cmake/utilities.cmake)
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_C_COMPILER clang)
@ -11,6 +13,6 @@ 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")
list(APPEND c_compile_options "--target=xtensa" "-mcpu=esp32" "-ffreestanding")
list(APPEND cxx_compile_options "--target=xtensa" "-mcpu=esp32" "-ffreestanding")
list(APPEND asm_compile_options "--target=xtensa" "-mcpu=esp32")

6
tools/cmake/toolchain-clang-esp32s2.cmake
View File

@ -11,6 +11,6 @@ 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")
list(APPEND c_compile_options "--target=xtensa" "-mcpu=esp32s2" "-ffreestanding")
list(APPEND cxx_compile_options "--target=xtensa" "-mcpu=esp32s2" "-ffreestanding")
list(APPEND asm_compile_options "--target=xtensa" "-mcpu=esp32s2")

3
tools/cmake/toolchain-esp32.cmake
View File

@ -4,5 +4,4 @@ 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")
list(APPEND compile_options "-mlongcalls" "-Wno-frame-address")

10
tools/cmake/toolchain-esp32c3.cmake
View File

@ -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")

10
tools/cmake/toolchain-esp32h2.cmake
View File

@ -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")

4
tools/cmake/toolchain-esp32s2.cmake
View File

@ -4,5 +4,5 @@ set(CMAKE_C_COMPILER xtensa-esp32s2-elf-gcc)
set(CMAKE_CXX_COMPILER xtensa-esp32s2-elf-g++)
set(CMAKE_ASM_COMPILER xtensa-esp32s2-elf-gcc)
set(CMAKE_C_FLAGS "-mlongcalls" CACHE STRING "C Compiler Base Flags")
set(CMAKE_CXX_FLAGS "-mlongcalls" CACHE STRING "C++ Compiler Base Flags")
list(APPEND compile_options "-mlongcalls")

3
tools/cmake/toolchain-esp32s3.cmake
View File

@ -4,5 +4,4 @@ set(CMAKE_C_COMPILER xtensa-esp32s3-elf-gcc)
set(CMAKE_CXX_COMPILER xtensa-esp32s3-elf-g++)
set(CMAKE_ASM_COMPILER xtensa-esp32s3-elf-gcc)
set(CMAKE_C_FLAGS "-mlongcalls" CACHE STRING "C Compiler Base Flags")
set(CMAKE_CXX_FLAGS "-mlongcalls" CACHE STRING "C++ Compiler Base Flags")
list(APPEND compile_options "-mlongcalls")

11
tools/cmake/utilities.cmake
View File

@ -283,6 +283,17 @@ function(add_c_compile_options)
endforeach()
endfunction()
# add_compile_options variant for ASM code only
#
# This adds global options, set target properties for
# component-specific flags
function(add_asm_compile_options)
foreach(option ${ARGV})
# note: the Visual Studio Generator doesn't support this...
add_compile_options($<$<COMPILE_LANGUAGE:ASM>:${option}>)
endforeach()
endfunction()
# add_prebuild_library
#