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126 lines
3.9 KiB
126 lines
3.9 KiB
# Copyright (c) 2023-present The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or https://opensource.org/license/mit/.
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include_guard(GLOBAL)
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include(CheckCXXSourceCompiles)
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#[=[
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Add language-wide flags, which will be passed to all invocations of the compiler.
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This includes invocations that drive compiling and those that drive linking.
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Usage examples:
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try_append_cxx_flags("-Wformat -Wformat-security" VAR warn_cxx_flags)
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try_append_cxx_flags("-Wsuggest-override" VAR warn_cxx_flags
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SOURCE "struct A { virtual void f(); }; struct B : A { void f() final; };"
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)
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try_append_cxx_flags("-fsanitize=${SANITIZERS}" TARGET core_interface
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RESULT_VAR cxx_supports_sanitizers
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)
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if(NOT cxx_supports_sanitizers)
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message(FATAL_ERROR "Compiler did not accept requested flags.")
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endif()
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try_append_cxx_flags("-Wunused-parameter" TARGET core_interface
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IF_CHECK_PASSED "-Wno-unused-parameter"
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)
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In configuration output, this function prints a string by the following pattern:
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-- Performing Test CXX_SUPPORTS_[flags]
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-- Performing Test CXX_SUPPORTS_[flags] - Success
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]=]
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function(try_append_cxx_flags flags)
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cmake_parse_arguments(PARSE_ARGV 1
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TACXXF # prefix
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"SKIP_LINK" # options
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"TARGET;VAR;SOURCE;RESULT_VAR" # one_value_keywords
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"IF_CHECK_PASSED" # multi_value_keywords
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)
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set(flags_as_string "${flags}")
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separate_arguments(flags)
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string(MAKE_C_IDENTIFIER "${flags_as_string}" id_string)
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string(TOUPPER "${id_string}" id_string)
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set(source "int main() { return 0; }")
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if(DEFINED TACXXF_SOURCE AND NOT TACXXF_SOURCE STREQUAL source)
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set(source "${TACXXF_SOURCE}")
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string(SHA256 source_hash "${source}")
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string(SUBSTRING ${source_hash} 0 4 source_hash_head)
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string(APPEND id_string _${source_hash_head})
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endif()
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# This avoids running a linker.
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set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
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set(CMAKE_REQUIRED_FLAGS "${flags_as_string} ${working_compiler_werror_flag}")
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set(compiler_result CXX_SUPPORTS_${id_string})
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check_cxx_source_compiles("${source}" ${compiler_result})
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if(${compiler_result})
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if(DEFINED TACXXF_IF_CHECK_PASSED)
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if(DEFINED TACXXF_TARGET)
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target_compile_options(${TACXXF_TARGET} INTERFACE ${TACXXF_IF_CHECK_PASSED})
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endif()
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if(DEFINED TACXXF_VAR)
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string(STRIP "${${TACXXF_VAR}} ${TACXXF_IF_CHECK_PASSED}" ${TACXXF_VAR})
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endif()
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else()
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if(DEFINED TACXXF_TARGET)
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target_compile_options(${TACXXF_TARGET} INTERFACE ${flags})
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endif()
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if(DEFINED TACXXF_VAR)
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string(STRIP "${${TACXXF_VAR}} ${flags_as_string}" ${TACXXF_VAR})
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endif()
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endif()
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endif()
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if(DEFINED TACXXF_VAR)
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set(${TACXXF_VAR} "${${TACXXF_VAR}}" PARENT_SCOPE)
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endif()
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if(DEFINED TACXXF_RESULT_VAR)
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set(${TACXXF_RESULT_VAR} "${${compiler_result}}" PARENT_SCOPE)
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endif()
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if(NOT ${compiler_result} OR TACXXF_SKIP_LINK)
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return()
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endif()
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# This forces running a linker.
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set(CMAKE_TRY_COMPILE_TARGET_TYPE EXECUTABLE)
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set(CMAKE_REQUIRED_FLAGS "${flags_as_string}")
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set(CMAKE_REQUIRED_LINK_OPTIONS ${working_linker_werror_flag})
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set(linker_result LINKER_SUPPORTS_${id_string})
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check_cxx_source_compiles("${source}" ${linker_result})
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if(${linker_result})
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if(DEFINED TACXXF_IF_CHECK_PASSED)
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if(DEFINED TACXXF_TARGET)
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target_link_options(${TACXXF_TARGET} INTERFACE ${TACXXF_IF_CHECK_PASSED})
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endif()
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else()
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if(DEFINED TACXXF_TARGET)
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target_link_options(${TACXXF_TARGET} INTERFACE ${flags})
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endif()
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endif()
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else()
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message(WARNING "'${flags_as_string}' fail(s) to link.")
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endif()
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endfunction()
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if(MSVC)
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try_append_cxx_flags("/WX /options:strict" VAR working_compiler_werror_flag SKIP_LINK)
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else()
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try_append_cxx_flags("-Werror" VAR working_compiler_werror_flag SKIP_LINK)
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endif()
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