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Add CMake helper for GNU warnings

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This commit is contained in:
Jean Pierre Cimalando 2020-12-13 16:11:53 +01:00
parent f6f398101b
commit 88e7dc0526
1 changed files with 94 additions and 0 deletions
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94
cmake/GNUWarnings.cmake Normal file
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# A CMake module to use GNU warning flags with C and C++
# and detect their availability.
#
# Usage:
# gw_warn(<Wflag>...)
# gw_warn_c(<Wflag>...)
# gw_warn_cxx(<Wflag>...)
# gw_target_warn(<target> <PUBLIC|PRIVATE|INTERFACE> <Wflag>...)
# gw_target_warn_c(<target> <PUBLIC|PRIVATE|INTERFACE> <Wflag>...)
# gw_target_warn_cxx(<target> <PUBLIC|PRIVATE|INTERFACE> <Wflag>...)
#
# Copyright 2020, Jean Pierre Cimalando <jp-dev@inbox.ru>
# SPDX-License-Identifier: BSD-2-Clause
function(gw_warn)
gw_warn_c(${ARGN})
gw_warn_cxx(${ARGN})
endfunction()
function(gw_warn_c)
if(CMAKE_C_COMPILER_ID MATCHES "GNU|Clang")
foreach(flag ${ARGN})
_gw_check_c_flag_is_silent("${flag}")
if("${GNUWARNINGS_C_FLAG_${flag}_SILENT}")
add_compile_options("$<$<COMPILE_LANGUAGE:C>:${flag}>")
endif()
endforeach()
endif()
endfunction()
function(gw_warn_cxx)
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
foreach(flag ${ARGN})
_gw_check_cxx_flag_is_silent("${flag}")
if("${GNUWARNINGS_CXX_FLAG_${flag}_SILENT}")
add_compile_options("$<$<COMPILE_LANGUAGE:CXX>:${flag}>")
endif()
endforeach()
endif()
endfunction()
function(gw_target_warn TARGET DOMAIN)
gw_target_warn_c("${TARGET}" "${DOMAIN}" ${ARGN})
gw_target_warn_cxx("${TARGET}" "${DOMAIN}" ${ARGN})
endfunction()
function(gw_target_warn_c TARGET DOMAIN)
if(CMAKE_C_COMPILER_ID MATCHES "GNU|Clang")
foreach(flag ${ARGN})
_gw_check_c_flag_is_silent("${flag}")
if("${GNUWARNINGS_C_FLAG_${flag}_SILENT}")
target_compile_options("${TARGET}" "${DOMAIN}" "$<$<COMPILE_LANGUAGE:C>:${flag}>")
endif()
endforeach()
endif()
endfunction()
function(gw_target_warn_cxx TARGET DOMAIN)
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
foreach(flag ${ARGN})
_gw_check_cxx_flag_is_silent("${flag}")
if("${GNUWARNINGS_CXX_FLAG_${flag}_SILENT}")
target_compile_options("${TARGET}" "${DOMAIN}" "$<$<COMPILE_LANGUAGE:CXX>:${flag}>")
endif()
endforeach()
endif()
endfunction()
function(_gw_check_c_flag_is_silent FLAG)
if(NOT DEFINED "GNUWARNINGS_C_FLAG_${FLAG}_SILENT")
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CheckGNUWarning.c" "")
_gw_check_command_succeeds_silently(_result "${CMAKE_C_COMPILER}" "${FLAG}" "-c" "-o" "${CMAKE_CURRENT_BINARY_DIR}/CheckGNUWarning.o" "${CMAKE_CURRENT_BINARY_DIR}/CheckGNUWarning.c")
message(STATUS "Have C warning ${flag}: ${_result}")
set("GNUWARNINGS_C_FLAG_${FLAG}_SILENT" "${_result}" CACHE BOOL "Have C warning ${flag}")
endif()
endfunction()
function(_gw_check_cxx_flag_is_silent FLAG)
if(NOT DEFINED "GNUWARNINGS_CXX_FLAG_${FLAG}_SILENT")
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CheckGNUWarning.cpp" "")
_gw_check_command_succeeds_silently(_result "${CMAKE_CXX_COMPILER}" "${FLAG}" "-c" "-o" "${CMAKE_CURRENT_BINARY_DIR}/CheckGNUWarning.o" "${CMAKE_CURRENT_BINARY_DIR}/CheckGNUWarning.cpp")
message(STATUS "Have C++ warning ${flag}: ${_result}")
set("GNUWARNINGS_CXX_FLAG_${FLAG}_SILENT" "${_result}" CACHE BOOL "Have C++ warning ${flag}")
endif()
endfunction()
function(_gw_check_command_succeeds_silently RESULT_VARIABLE)
execute_process(COMMAND ${ARGN} RESULT_VARIABLE _result OUTPUT_VARIABLE _output ERROR_VARIABLE _error OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_STRIP_TRAILING_WHITESPACE)
if(_result EQUAL 0 AND _output STREQUAL "" AND _error STREQUAL "")
set("${RESULT_VARIABLE}" TRUE PARENT_SCOPE)
else()
set("${RESULT_VARIABLE}" FALSE PARENT_SCOPE)
endif()
endfunction()