| ## |
| ## 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 (NOT 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} ${flags}") |
| else () |
| set(target_link_flags "${flags}") |
| 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 () |
| |
| endif () # AOM_BUILD_CMAKE_COMPILER_FLAGS_CMAKE_ |