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https://git.mirrors.martin98.com/https://github.com/google/draco
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97 lines
3.4 KiB
CMake
97 lines
3.4 KiB
CMake
cmake_minimum_required(VERSION 3.2)
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include(CheckCCompilerFlag)
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include(CheckCXXCompilerFlag)
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# Strings used to cache failed C/CXX flags.
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set(DRACO_FAILED_C_FLAGS)
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set(DRACO_FAILED_CXX_FLAGS)
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# Checks C compiler for support of $c_flag. Adds $c_flag to $CMAKE_C_FLAGS when
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# the compile test passes. Caches $c_flag in $DRACO_FAILED_C_FLAGS when the test
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# fails.
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function (add_c_flag_if_supported c_flag)
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unset(C_FLAG_FOUND CACHE)
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string(FIND "${CMAKE_C_FLAGS}" "${c_flag}" C_FLAG_FOUND)
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unset(C_FLAG_FAILED CACHE)
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string(FIND "${DRACO_FAILED_C_FLAGS}" "${c_flag}" C_FLAG_FAILED)
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if (${C_FLAG_FOUND} EQUAL -1 AND ${C_FLAG_FAILED} EQUAL -1)
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unset(C_FLAG_SUPPORTED CACHE)
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message("Checking C compiler flag support for: " ${c_flag})
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check_c_compiler_flag("${c_flag}" C_FLAG_SUPPORTED)
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if (C_FLAG_SUPPORTED)
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${c_flag}" CACHE STRING "" FORCE)
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else ()
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set(DRACO_FAILED_C_FLAGS "${DRACO_FAILED_C_FLAGS} ${c_flag}" CACHE STRING
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"" FORCE)
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endif ()
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endif ()
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endfunction ()
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# Checks C++ compiler for support of $cxx_flag. Adds $cxx_flag to
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# $CMAKE_CXX_FLAGS when the compile test passes. Caches $c_flag in
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# $DRACO_FAILED_CXX_FLAGS when the test fails.
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function (add_cxx_flag_if_supported cxx_flag)
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unset(CXX_FLAG_FOUND CACHE)
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string(FIND "${CMAKE_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FOUND)
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unset(CXX_FLAG_FAILED CACHE)
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string(FIND "${DRACO_FAILED_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FAILED)
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if (${CXX_FLAG_FOUND} EQUAL -1 AND ${CXX_FLAG_FAILED} EQUAL -1)
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unset(CXX_FLAG_SUPPORTED CACHE)
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message("Checking CXX compiler flag support for: " ${cxx_flag})
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check_cxx_compiler_flag("${cxx_flag}" CXX_FLAG_SUPPORTED)
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if (CXX_FLAG_SUPPORTED)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cxx_flag}" CACHE STRING ""
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FORCE)
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else()
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set(DRACO_FAILED_CXX_FLAGS "${DRACO_FAILED_CXX_FLAGS} ${cxx_flag}" CACHE
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STRING "" FORCE)
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endif ()
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endif ()
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endfunction ()
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# Convenience method for adding a flag to both the C and C++ compiler command
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# lines.
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function (add_compiler_flag_if_supported flag)
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add_c_flag_if_supported(${flag})
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add_cxx_flag_if_supported(${flag})
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endfunction ()
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# Checks CXX compiler for support of $cxx_flag and terminates generation when
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# support is not present.
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function (require_cxx_flag cxx_flag)
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unset(CXX_FLAG_FOUND CACHE)
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string(FIND "${CMAKE_CXX_FLAGS}" "${cxx_flag}" CXX_FLAG_FOUND)
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if (${CXX_FLAG_FOUND} EQUAL -1)
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unset(DRACO_HAVE_CXX_FLAG)
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message("Checking CXX compiler flag support for: " ${cxx_flag})
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check_cxx_compiler_flag("${cxx_flag}" DRACO_HAVE_CXX_FLAG)
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if (NOT DRACO_HAVE_CXX_FLAG)
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message(FATAL_ERROR "Draco requires support for CXX flag: ${flag}.")
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endif ()
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set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}" CACHE STRING "" FORCE)
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endif ()
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endfunction ()
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# Checks only non-MSVC targets for support of $cxx_flag.
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function (require_cxx_flag_nomsvc cxx_flag)
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if (NOT MSVC)
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require_cxx_flag(${cxx_flag})
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endif ()
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endfunction ()
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# Adds $preproc_def to CXX compiler command line (as -D$preproc_def) if not
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# already present.
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function (add_cxx_preproc_definition preproc_def)
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unset(PREPROC_DEF_FOUND CACHE)
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string(FIND "${CMAKE_CXX_FLAGS}" "${preproc_def}" PREPROC_DEF_FOUND)
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if (${PREPROC_DEF_FOUND} EQUAL -1)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D${preproc_def}" CACHE STRING ""
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FORCE)
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endif ()
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endfunction ()
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