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##
## Copyright (c) 2016, Alliance for Open Media. All rights reserved
##
## This source code is subject to the terms of the BSD 2 Clause License and
## the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
## was not distributed with this source code in the LICENSE file, you can
## obtain it at www.aomedia.org/license/software. If the Alliance for Open
## Media Patent License 1.0 was not distributed with this source code in the
## PATENTS file, you can obtain it at www.aomedia.org/license/patent.
##
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
# Strings used to cache failed C/CXX flags.
set(AOM_FAILED_C_FLAGS)
set(AOM_FAILED_CXX_FLAGS)
# Checks C compiler for support of $c_flag. Adds $c_flag to $CMAKE_C_FLAGS when
# the compile test passes. Caches $c_flag in $AOM_FAILED_C_FLAGS when the test
# fails.
function (add_c_flag_if_supported c_flag)
unset(C_FLAG_FOUND CACHE)
string(FIND "${CMAKE_C_FLAGS}" "${c_flag}" C_FLAG_FOUND)
unset(C_FLAG_FAILED CACHE)
string(FIND "${AOM_FAILED_C_FLAGS}" "${c_flag}" C_FLAG_FAILED)
if (${C_FLAG_FOUND} EQUAL -1 AND ${C_FLAG_FAILED} EQUAL -1)
unset(C_FLAG_SUPPORTED CACHE)
message("Checking C compiler flag support for: " ${c_flag})
check_c_compiler_flag("${c_flag}" C_FLAG_SUPPORTED)
if (C_FLAG_SUPPORTED)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${c_flag}" CACHE STRING "" FORCE)
else ()
set(AOM_FAILED_C_FLAGS "${AOM_FAILED_C_FLAGS} ${c_flag}" CACHE STRING ""
FORCE)
endif ()
endif ()
endfunction ()
# Checks C++ compiler for support of $cxx_flag. Adds $cxx_flag to
# $CMAKE_CXX_FLAGS when the compile test passes. Caches $c_flag in
# $AOM_FAILED_CXX_FLAGS when the test fails.
function (add_cxx_flag_if_supported cxx_flag)
unset(CXX_FLAG_FOUND CACHE)
string(FIND "${CMAKE_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FOUND)
unset(CXX_FLAG_FAILED CACHE)
string(FIND "${AOM_FAILED_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FAILED)
if (${CXX_FLAG_FOUND} EQUAL -1 AND ${CXX_FLAG_FAILED} EQUAL -1)
unset(CXX_FLAG_SUPPORTED CACHE)
message("Checking CXX compiler flag support for: " ${cxx_flag})
check_cxx_compiler_flag("${cxx_flag}" CXX_FLAG_SUPPORTED)
if (CXX_FLAG_SUPPORTED)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cxx_flag}" CACHE STRING ""
FORCE)
else()
set(AOM_FAILED_CXX_FLAGS "${AOM_FAILED_CXX_FLAGS} ${cxx_flag}" CACHE
STRING "" FORCE)
endif ()
endif ()
endfunction ()
# Convenience method for adding a flag to both the C and C++ compiler command
# lines.
function (add_compiler_flag_if_supported flag)
add_c_flag_if_supported(${flag})
add_cxx_flag_if_supported(${flag})
endfunction ()
# Checks C compiler for support of $c_flag and terminates generation when
# support is not present.
function (require_c_flag c_flag update_c_flags)
unset(C_FLAG_FOUND CACHE)
string(FIND "${CMAKE_C_FLAGS}" "${c_flag}" C_FLAG_FOUND)
if (${C_FLAG_FOUND} EQUAL -1)
unset(HAVE_C_FLAG CACHE)
message("Checking C compiler flag support for: " ${c_flag})
check_c_compiler_flag("${c_flag}" HAVE_C_FLAG)
if (NOT HAVE_C_FLAG)
message(FATAL_ERROR
"${PROJECT_NAME} requires support for C flag: ${c_flag}.")
endif ()
if (update_c_flags)
set(CMAKE_C_FLAGS "${c_flag} ${CMAKE_C_FLAGS}" CACHE STRING "" FORCE)
endif ()
endif ()
endfunction ()
# Checks CXX compiler for support of $cxx_flag and terminates generation when
# support is not present.
function (require_cxx_flag cxx_flag update_cxx_flags)
unset(CXX_FLAG_FOUND CACHE)
string(FIND "${CMAKE_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FOUND)
if (${CXX_FLAG_FOUND} EQUAL -1)
unset(HAVE_CXX_FLAG CACHE)
message("Checking CXX compiler flag support for: " ${cxx_flag})
check_cxx_compiler_flag("${cxx_flag}" HAVE_CXX_FLAG)
if (NOT HAVE_CXX_FLAG)
message(FATAL_ERROR
"${PROJECT_NAME} requires support for CXX flag: ${cxx_flag}.")
endif ()
if (update_cxx_flags)
set(CMAKE_CXX_FLAGS "${cxx_flag} ${CMAKE_CXX_FLAGS}" CACHE STRING ""
FORCE)
endif ()
endif ()
endfunction ()
# Checks for support of $flag by both the C and CXX compilers. Terminates
# generation when support is not present in both compilers.
function (require_flag flag update_cmake_flags)
require_c_flag(${flag} ${update_cmake_flags})
require_cxx_flag(${flag} ${update_cmake_flags})
endfunction ()
# Checks only non-MSVC targets for support of $c_flag and terminates generation
# when support is not present.
function (require_c_flag_nomsvc c_flag update_c_flags)
if (NOT MSVC)
require_c_flag(${c_flag} ${update_c_flags})
endif ()
endfunction ()
# Checks only non-MSVC targets for support of $cxx_flag and terminates
# generation when support is not present.
function (require_cxx_flag_nomsvc cxx_flag update_cxx_flags)
if (NOT MSVC)
require_cxx_flag(${cxx_flag} ${update_cxx_flags})
endif ()
endfunction ()
# Checks only non-MSVC targets for support of $flag by both the C and CXX
# compilers. Terminates generation when support is not present in both
# compilers.
function (require_flag_nomsvc flag update_cmake_flags)
require_c_flag_nomsvc(${flag} ${update_cmake_flags})
require_cxx_flag_nomsvc(${flag} ${update_cmake_flags})
endfunction ()
# Adds $preproc_def to C compiler command line (as -D$preproc_def) if not
# already present.
function (add_c_preproc_definition preproc_def)
unset(PREPROC_DEF_FOUND CACHE)
string(FIND "${CMAKE_C_FLAGS}" "${preproc_def}" PREPROC_DEF_FOUND)
if (${PREPROC_DEF_FOUND} EQUAL -1)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D${preproc_def}" CACHE STRING ""
FORCE)
endif ()
endfunction ()
# Adds $preproc_def to CXX compiler command line (as -D$preproc_def) if not
# already present.
function (add_cxx_preproc_definition preproc_def)
unset(PREPROC_DEF_FOUND CACHE)
string(FIND "${CMAKE_CXX_FLAGS}" "${preproc_def}" PREPROC_DEF_FOUND)
if (${PREPROC_DEF_FOUND} EQUAL -1)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D${preproc_def}" CACHE STRING ""
FORCE)
endif ()
endfunction ()
# Adds $preproc_def to C and CXX compiler command line (as -D$preproc_def) if
# not already present.
function (add_preproc_definition preproc_def)
add_c_preproc_definition(${preproc_def})
add_cxx_preproc_definition(${preproc_def})
endfunction ()
# Adds $flag to assembler command line.
function (append_as_flag flag)
unset(AS_FLAG_FOUND CACHE)
string(FIND "${AOM_AS_FLAGS}" "${flag}" AS_FLAG_FOUND)
if (${AS_FLAG_FOUND} EQUAL -1)
set(AOM_AS_FLAGS "${AOM_AS_FLAGS} ${flag}" CACHE STRING "" FORCE)
endif ()
endfunction ()
# Adds $flag to the C compiler command line.
function (append_c_flag flag)
unset(C_FLAG_FOUND CACHE)
string(FIND "${CMAKE_C_FLAGS}" "${flag}" C_FLAG_FOUND)
if (${C_FLAG_FOUND} EQUAL -1)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" CACHE STRING "" FORCE)
endif ()
endfunction ()
# Adds $flag to the CXX compiler command line.
function (append_cxx_flag flag)
unset(CXX_FLAG_FOUND CACHE)
string(FIND "${CMAKE_CXX_FLAGS}" "${flag}" CXX_FLAG_FOUND)
if (${CXX_FLAG_FOUND} EQUAL -1)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" CACHE STRING "" FORCE)
endif ()
endfunction ()
# Adds $flag to the C and CXX compiler command lines.
function (append_compiler_flag flag)
append_c_flag(${flag})
append_cxx_flag(${flag})
endfunction ()
# Adds $flag to the executable linker command line.
function (append_exe_linker_flag flag)
unset(LINKER_FLAG_FOUND CACHE)
string(FIND "${CMAKE_EXE_LINKER_FLAGS}" "${flag}" LINKER_FLAG_FOUND)
if (${LINKER_FLAG_FOUND} EQUAL -1)
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${flag}" CACHE STRING
"" FORCE)
endif ()
endfunction ()
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