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cmake: Use add_compile_options() in try_add_compile_option()

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This change drops tinkering with the `COMPILE_OPTIONS` directory
property. Also `try_add_compile_option()` can handle a list of flags
now, if they are required to be checked simultaneously.

An explanatory comments have been added as well.
This commit is contained in:
Hennadii Stepanov 2023-04-27 14:39:10 +01:00
parent 4b84f4bf0f
commit 19516ed3e9
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GPG Key ID: 410108112E7EA81F
1 changed files with 18 additions and 17 deletions
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35
cmake/TryAddCompileOption.cmake
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@ -1,23 +1,24 @@
include(CheckCCompilerFlag)
function(try_add_compile_option option)
string(MAKE_C_IDENTIFIER ${option} result)
string(TOUPPER ${result} result)
set(result "C_SUPPORTS${result}")
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
function(secp256k1_check_c_flags_internal flags output)
string(MAKE_C_IDENTIFIER "${flags}" result)
string(TOUPPER "${result}" result)
set(result "C_SUPPORTS_${result}")
if(NOT MSVC)
set(CMAKE_REQUIRED_FLAGS "-Werror")
endif()
check_c_compiler_flag(${option} ${result})
if(${result})
get_property(compile_options
DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
PROPERTY COMPILE_OPTIONS
)
list(APPEND compile_options "${option}")
set_property(
DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
PROPERTY COMPILE_OPTIONS "${compile_options}"
)
endif()
# This avoids running a linker.
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
check_c_compiler_flag("${flags}" ${result})
set(${output} ${${result}} PARENT_SCOPE)
endfunction()
# Append flags to the COMPILE_OPTIONS directory property if CC accepts them.
macro(try_add_compile_option)
secp256k1_check_c_flags_internal("${ARGV}" result)
if(result)
add_compile_options(${ARGV})
endif()
endmacro()