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# Copyright (c) 2016 The WebM project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS. All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
include(CheckCXXCompilerFlag)
# String used to cache failed CXX flags.
set(LIBWEBM_FAILED_CXX_FLAGS)
# Checks C++ compiler for support of $cxx_flag. Adds $cxx_flag to
# $CMAKE_CXX_FLAGS when the compile test passes. Caches $c_flag in
# $LIBWEBM_FAILED_CXX_FLAGS when the test fails.
function(add_cxx_flag_if_supported cxx_flag)
unset(CXX_FLAG_FOUND CACHE)
string(FIND "${CMAKE_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FOUND)
unset(CXX_FLAG_FAILED CACHE)
string(FIND "${LIBWEBM_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} ${cxx_flag}"
CACHE STRING "" FORCE)
else()
set(LIBWEBM_FAILED_CXX_FLAGS
"${LIBWEBM_FAILED_CXX_FLAGS} ${cxx_flag}"
CACHE STRING "" FORCE)
endif()
endif()
endfunction()
# Checks CXX compiler for support of $cxx_flag and terminates generation when
# support is not present.
function(require_cxx_flag cxx_flag)
unset(CXX_FLAG_FOUND CACHE)
string(FIND "${CMAKE_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FOUND)
if(${CXX_FLAG_FOUND} EQUAL -1)
unset(LIBWEBM_HAVE_CXX_FLAG CACHE)
message("Checking CXX compiler flag support for: " ${cxx_flag})
check_cxx_compiler_flag("${cxx_flag}" LIBWEBM_HAVE_CXX_FLAG)
if(NOT LIBWEBM_HAVE_CXX_FLAG)
message(
FATAL_ERROR
"${PROJECT_NAME} requires support for CXX flag: ${cxx_flag}.")
endif()
set(CMAKE_CXX_FLAGS
"${cxx_flag} ${CMAKE_CXX_FLAGS}"
CACHE STRING "" FORCE)
endif()
endfunction()
# Checks only non-MSVC targets for support of $cxx_flag.
function(require_cxx_flag_nomsvc cxx_flag)
if(NOT MSVC)
require_cxx_flag(${cxx_flag})
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()
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