diff options
Diffstat (limited to 'third_party/aom/build/cmake/compiler_flags.cmake')
| -rw-r--r-- | third_party/aom/build/cmake/compiler_flags.cmake | 373 |
1 files changed, 373 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..79192c1fa --- /dev/null +++ b/third_party/aom/build/cmake/compiler_flags.cmake @@ -0,0 +1,373 @@ +# +# 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. +# +if(AOM_BUILD_CMAKE_COMPILER_FLAGS_CMAKE_) + return() +endif() # AOM_BUILD_CMAKE_COMPILER_FLAGS_CMAKE_ +set(AOM_BUILD_CMAKE_COMPILER_FLAGS_CMAKE_ 1) + +include(CheckCCompilerFlag) +include(CheckCXXCompilerFlag) +include("${AOM_ROOT}/build/cmake/compiler_tests.cmake") + +# Strings used to cache flags. +set(AOM_C_FLAGS) +set(AOM_CXX_FLAGS) +set(AOM_EXE_LINKER_FLAGS) +set(AOM_FAILED_C_FLAGS) +set(AOM_FAILED_CXX_FLAGS) + +# Sets variable named by $out_is_present to YES in the caller's scope when $flag +# is found in the string variable named by $flag_cache. Sets the var to NO +# otherwise. +function(is_flag_present flag_cache flag out_is_present) + string(FIND "${${flag_cache}}" "${flag}" flag_pos) + if(${flag_pos} EQUAL -1) + set(${out_is_present} NO PARENT_SCOPE) + else() + set(${out_is_present} YES PARENT_SCOPE) + endif() +endfunction() + +# Appends $flag to $flags. Ignores scope via use of FORCE with set() call. +function(append_flag flags flag) + string(FIND "${${flags}}" "${flag}" found) + if(${found} EQUAL -1) + set(${flags} "${${flags}} ${flag}" CACHE STRING "" FORCE) + endif() +endfunction() + +# Checks C compiler for support of $c_flag. Adds $c_flag to all +# $CMAKE_C_FLAGS_<CONFIG>s stored in AOM_C_CONFIGS when the compile test passes. +# Caches $c_flag in $AOM_C_FLAGS or $AOM_FAILED_C_FLAGS depending on test +# outcome. +function(add_c_flag_if_supported c_flag) + if(DEBUG_CMAKE_DISABLE_COMPILER_TESTS) + return() + endif() + + is_flag_present(AOM_C_FLAGS "${c_flag}" flag_ok) + is_flag_present(AOM_FAILED_C_FLAGS "${c_flag}" flag_failed) + if(${flag_ok} OR ${flag_failed}) + return() + endif() + + unset(C_FLAG_SUPPORTED CACHE) + message("Checking C compiler flag support for: " ${c_flag}) + check_c_compiler_flag("${c_flag}" C_FLAG_SUPPORTED) + + if(${C_FLAG_SUPPORTED}) + append_flag(AOM_C_FLAGS "${c_flag}") + foreach(config ${AOM_C_CONFIGS}) + unset(C_FLAG_FOUND) + append_flag("${config}" "${c_flag}") + endforeach() + else() + append_flag(AOM_FAILED_C_FLAGS "${c_flag}") + endif() +endfunction() + +# Checks C++ compiler for support of $cxx_flag. Adds $cxx_flag to all +# $CMAKE_CXX_FLAGS_<CONFIG>s stored in AOM_CXX_CONFIGS when the compile test +# passes. Caches $cxx_flag in $AOM_CXX_FLAGS or $AOM_FAILED_CXX_FLAGS depending +# on test outcome. +function(add_cxx_flag_if_supported cxx_flag) + if(DEBUG_CMAKE_DISABLE_COMPILER_TESTS) + return() + endif() + + is_flag_present(AOM_CXX_FLAGS "${cxx_flag}" flag_ok) + is_flag_present(AOM_FAILED_CXX_FLAGS "${cxx_flag}" flag_failed) + if(${flag_ok} OR ${flag_failed}) + return() + endif() + + unset(CXX_FLAG_SUPPORTED CACHE) + message("Checking C++ compiler flag support for: " ${cxx_flag}) + check_cxx_compiler_flag("${cxx_flag}" CXX_FLAG_SUPPORTED) + + if(${CXX_FLAG_SUPPORTED}) + append_flag(AOM_CXX_FLAGS "${cxx_flag}") + foreach(config ${AOM_CXX_CONFIGS}) + unset(CXX_FLAG_FOUND) + append_flag("${config}" "${cxx_flag}") + endforeach() + else() + append_flag(AOM_FAILED_CXX_FLAGS "${cxx_flag}") + 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 $c_flag and terminates generation when +# support is not present. +function(require_c_flag c_flag update_c_flags) + if(DEBUG_CMAKE_DISABLE_COMPILER_TESTS) + return() + endif() + + is_flag_present(AOM_C_FLAGS "${c_flag}" flag_ok) + if(${flag_ok}) + return() + endif() + + if(NOT "${AOM_EXE_LINKER_FLAGS}" STREQUAL "") + aom_push_var(CMAKE_EXE_LINKER_FLAGS "${AOM_EXE_LINKER_FLAGS}") + endif() + + 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: ${c_flag}.") + endif() + + if(NOT "${AOM_EXE_LINKER_FLAGS}" STREQUAL "") + aom_pop_var(CMAKE_EXE_LINKER_FLAGS) + endif() + + append_flag(AOM_C_FLAGS "${c_flag}") + if(update_c_flags) + foreach(config ${AOM_C_CONFIGS}) + set(${config} "${${config}} ${c_flag}" CACHE STRING "" FORCE) + endforeach() + endif() +endfunction() + +# Checks CXX compiler for support of $cxx_flag and terminates generation when +# support is not present. +function(require_cxx_flag cxx_flag update_cxx_flags) + if(DEBUG_CMAKE_DISABLE_COMPILER_TESTS) + return() + endif() + + is_flag_present(AOM_CXX_FLAGS "${cxx_flag}" flag_ok) + if(${flag_ok}) + return() + endif() + + if(NOT "${AOM_EXE_LINKER_FLAGS}" STREQUAL "") + aom_push_var(CMAKE_EXE_LINKER_FLAGS "${AOM_EXE_LINKER_FLAGS}") + endif() + + unset(HAVE_CXX_FLAG CACHE) + message("Checking C 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 C flag: ${cxx_flag}.") + endif() + + if(NOT "${AOM_EXE_LINKER_FLAGS}" STREQUAL "") + aom_pop_var(CMAKE_EXE_LINKER_FLAGS) + endif() + + append_flag(AOM_CXX_FLAGS "${cxx_flag}") + if(update_cxx_flags) + foreach(config ${AOM_CXX_CONFIGS}) + set(${config} "${${config}} ${cxx_flag}" CACHE STRING "" FORCE) + endforeach() + endif() +endfunction() + +# Checks for support of $flag by both the C and CXX compilers. Terminates +# generation when support is not present in both compilers. +function(require_compiler_flag flag update_cmake_flags) + require_c_flag(${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 $flag by both the C and CXX +# compilers. Terminates generation when support is not present in both +# compilers. +function(require_compiler_flag_nomsvc flag update_cmake_flags) + require_c_flag_nomsvc(${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) + set(preproc_def "-D${preproc_def}") + is_flag_present(AOM_C_FLAGS "${preproc_def}" flag_cached) + if(${flag_cached}) + return() + endif() + + foreach(config ${AOM_C_CONFIGS}) + set(${config} "${${config}} ${preproc_def}" CACHE STRING "" FORCE) + endforeach() +endfunction() + +# Adds $preproc_def to CXX compiler command line (as -D$preproc_def) if not +# already present. +function(add_cxx_preproc_definition preproc_def) + set(preproc_def "-D${preproc_def}") + is_flag_present(AOM_CXX_FLAGS "${preproc_def}" flag_cached) + if(${flag_cached}) + return() + endif() + + foreach(config ${AOM_CXX_CONFIGS}) + set(${config} "${${config}} ${preproc_def}" CACHE STRING "" FORCE) + endforeach() +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 $flag to assembler command line. +function(append_as_flag flag) + is_flag_present(AOM_AS_FLAGS "${flag}" flag_cached) + if(${flag_cached}) + return() + endif() + append_flag(AOM_AS_FLAGS "${flag}") +endfunction() + +# Adds $flag to the C compiler command line. +function(append_c_flag flag) + is_flag_present(AOM_C_FLAGS "${flag}" flag_cached) + if(${flag_cached}) + return() + endif() + + foreach(config ${AOM_C_CONFIGS}) + append_flag(${config} "${flag}") + endforeach() +endfunction() + +# Adds $flag to the CXX compiler command line. +function(append_cxx_flag flag) + is_flag_present(AOM_CXX_FLAGS "${flag}" flag_cached) + if(${flag_cached}) + return() + endif() + + foreach(config ${AOM_CXX_CONFIGS}) + append_flag(${config} "${flag}") + endforeach() +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 $flag to the executable linker command line when not present. +function(append_exe_linker_flag flag) + is_flag_present(AOM_EXE_LINKER_FLAGS "${flag}" flag_cached) + if(${flag_cached}) + return() + endif() + + append_flag(AOM_EXE_LINKER_FLAGS "${flag}") + foreach(config ${AOM_EXE_LINKER_CONFIGS}) + append_flag(${config} "${flag}") + endforeach() +endfunction() + +# Adds $flag to the link flags for $target. +function(append_link_flag_to_target target flag) + unset(target_link_flags) + get_target_property(target_link_flags ${target} LINK_FLAGS) + + if(target_link_flags) + is_flag_present(target_link_flags "${flag}" flag_found) + if(${flag_found}) + return() + endif() + set(target_link_flags "${target_link_flags} ${flag}") + else() + set(target_link_flags "${flag}") + endif() + + set_target_properties(${target} PROPERTIES LINK_FLAGS ${target_link_flags}) +endfunction() + +# Adds $flag to executable linker flags, and makes sure C/CXX builds still work. +function(require_linker_flag flag) + if(DEBUG_CMAKE_DISABLE_COMPILER_TESTS) + return() + endif() + + append_exe_linker_flag(${flag}) + + unset(c_passed) + aom_check_c_compiles("LINKER_FLAG_C_TEST(${flag})" "" c_passed) + unset(cxx_passed) + aom_check_cxx_compiles("LINKER_FLAG_CXX_TEST(${flag})" "" cxx_passed) + + if(NOT c_passed OR NOT cxx_passed) + message(FATAL_ERROR "Linker flag test for ${flag} failed.") + endif() +endfunction() + +# Appends flags in $AOM_EXTRA_<TYPE>_FLAGS variables to the flags used at build +# time. +function(set_user_flags) + + # Linker flags are handled first because some C/CXX flags require that a + # linker flag is present at link time. + if(AOM_EXTRA_EXE_LINKER_FLAGS) + is_flag_present(AOM_EXE_LINKER_FLAGS "${AOM_EXTRA_EXE_LINKER_FLAGS}" + extra_present) + if(NOT ${extra_present}) + require_linker_flag("${AOM_EXTRA_EXE_LINKER_FLAGS}") + endif() + endif() + if(AOM_EXTRA_AS_FLAGS) + + # TODO(tomfinegan): assembler flag testing would be a good thing to have. + is_flag_present(AOM_AS_FLAGS "${AOM_EXTRA_AS_FLAGS}" extra_present) + if(NOT ${extra_present}) + append_flag(AOM_AS_FLAGS "${AOM_EXTRA_AS_FLAGS}") + endif() + endif() + if(AOM_EXTRA_C_FLAGS) + is_flag_present(AOM_C_FLAGS "${AOM_EXTRA_C_FLAGS}" extra_present) + if(NOT ${extra_present}) + require_c_flag("${AOM_EXTRA_C_FLAGS}" YES) + endif() + endif() + if(AOM_EXTRA_CXX_FLAGS) + is_flag_present(AOM_CXX_FLAGS "${AOM_EXTRA_CXX_FLAGS}" extra_present) + if(NOT ${extra_present}) + require_cxx_flag("${AOM_EXTRA_CXX_FLAGS}" YES) + endif() + endif() +endfunction() |