diff options
Diffstat (limited to 'third_party/aom/build/cmake/compiler_flags.cmake')
| -rw-r--r-- | third_party/aom/build/cmake/compiler_flags.cmake | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/third_party/aom/build/cmake/compiler_flags.cmake b/third_party/aom/build/cmake/compiler_flags.cmake new file mode 100644 index 000000000..beb217abc --- /dev/null +++ b/third_party/aom/build/cmake/compiler_flags.cmake @@ -0,0 +1,218 @@ +## +## 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 () |