mirror of https://github.com/YosysHQ/nextpnr.git
35 lines
1.4 KiB
CMake
35 lines
1.4 KiB
CMake
# This is checking for CMAKE_CXX_COMPILER's ability to use `#embed`.
|
|
# BBAsm is using `#embed` (C) and not `std::embed` (C++) even though it emits C++ code.
|
|
# As of 2025-01-16: Note that the usage of `#embed` in C has different rules (the C++ one is
|
|
# an extension, the C one is in the C23 standard).
|
|
|
|
# Example usage:
|
|
#
|
|
# check_cxx_compiler_hash_embed(HAS_HASH_EMBED CXX_FLAGS_HASH_EMBED)
|
|
# set(CMAKE_CXX_FLAGS ${CXX_FLAGS_HASH_EMBED} ${CMAKE_CXX_FLAGS})
|
|
#
|
|
function(check_cxx_compiler_hash_embed VAR FLAGS_VAR)
|
|
# Create a binary file with at least one byte that will check for #embed treating things as signed chars
|
|
execute_process(
|
|
COMMAND python3 -c "with open('${CMAKE_CURRENT_BINARY_DIR}/unsigned_bin', 'wb') as f: f.write(b'\\xA5\\x27\\x00')")
|
|
|
|
try_compile(
|
|
${VAR}
|
|
SOURCE_FROM_CONTENT
|
|
compiletest.cc
|
|
"const unsigned char s[] = {\n#embed \"${CMAKE_CURRENT_BINARY_DIR}/unsigned_bin\"\n};\nint main() {}"
|
|
)
|
|
if (${VAR})
|
|
if (FLAGS_VAR)
|
|
check_cxx_compiler_flag(-Wc23-extensions HAS_Wc23-extensions)
|
|
if (HAS_Wc23-extensions)
|
|
set(${FLAGS_VAR} -Wno-c23-extensions PARENT_SCOPE)
|
|
endif()
|
|
endif()
|
|
|
|
message(STATUS "C++ compiler supports #embed")
|
|
else()
|
|
message(STATUS "C++ compiler does NOT support #embed")
|
|
endif()
|
|
endfunction()
|