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clang: Provide --target option when determining path to runtime library

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Clang/LLVM is natively a cross-compiler, so one set of applications can
compile code to all supported targets. The default target can be changed
using '--target' option.

CMake supports this type of compilers. To change compiling target, one
should set CMAKE_C_COMPILER_TARGET accorgindly.

The '--target' option has impact on the path to clang-rt library
returned by compiler when run with '--print-libgcc-file-name' option.
Without specifying target, Clang will return path to runtime library of
the host target (e.g. x86_64-pc-linux-gnu).

Signed-off-by: Patryk Duda <pdk@semihalf.com>
This commit is contained in:
Patryk Duda 2023-07-14 19:30:05 +02:00 • committed by Carles Cufí
commit 3a97fe256c
1 changed files with 6 additions and 1 deletions
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7
cmake/compiler/clang/target.cmake
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@ -32,6 +32,10 @@ if(NOT "${ARCH}" STREQUAL "posix")
include(${ZEPHYR_BASE}/cmake/compiler/clang/target_arm.cmake)
endif()
if(DEFINED CMAKE_C_COMPILER_TARGET)
set(clang_target_flag "--target=${CMAKE_C_COMPILER_TARGET}")
endif()
foreach(file_name include/stddef.h)
execute_process(
COMMAND ${CMAKE_C_COMPILER} --print-file-name=${file_name}
@ -57,7 +61,8 @@ if(NOT "${ARCH}" STREQUAL "posix")
# This libgcc code is partially duplicated in compiler/*/target.cmake
execute_process(
COMMAND ${CMAKE_C_COMPILER} ${TOOLCHAIN_C_FLAGS} --print-libgcc-file-name
COMMAND ${CMAKE_C_COMPILER} ${clang_target_flag} ${TOOLCHAIN_C_FLAGS}
--print-libgcc-file-name
OUTPUT_VARIABLE RTLIB_FILE_NAME
OUTPUT_STRIP_TRAILING_WHITESPACE
)