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# - Turn on optimizations based on build type
include(TestCXXAcceptsFlag)
include (AddOptions)
include (UseCompVer)
is_compiler_gcc_compatible ()
# mapping from profile name (in CMAKE_BUILD_TYPE) to variable part
set (_prof_DEBUG "Debug")
set (_prof_RELEASE "Release;RelWithDebInfo;MinSizeRel")
# if we are building a debug target, then disable all optimizations
# otherwise, turn them on. indicate to the code what we have done
# so it can turn on assertions etc.
if (CXX_COMPAT_GCC)
# extra flags passed for optimization
set (_opt_flags "")
# link-time (a.k.a. global) optimizations
# disabled due to widespread bugs in the linker plugin
option (WHOLE_PROG_OPTIM "Whole program optimization (lto)" OFF)
if (WHOLE_PROG_OPTIM)
check_cxx_accepts_flag ("-flto" HAVE_LINK_OPTS)
check_cxx_accepts_flag ("-fuse-linker-plugin" HAVE_LINK_PLUGIN)
if (HAVE_LINK_OPTS)
list (APPEND _opt_flags "-flto")
endif (HAVE_LINK_OPTS)
if (HAVE_LINK_PLUGIN)
list (APPEND _opt_flags "-fuse-linker-plugin")
endif (HAVE_LINK_PLUGIN)
if(HAVE_LINK_OPTS AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
string(REPLACE "." ";" VERSION_LIST "${CMAKE_C_COMPILER_VERSION}")
list(GET VERSION_LIST 0 VER_MAJOR)
find_program(LTO_AR_COMMAND NAMES ${CMAKE_C_COMPILER}-ar gcc-ar-${VER_MAJOR} gcc-ar)
find_program(LTO_RANLIB_COMMAND NAMES ${CMAKE_C_COMPILER}-ranlib gcc-ranlib-${VER_MAJOR} gcc-ranlib)
if(LTO_AR_COMMAND)
set(CMAKE_AR ${LTO_AR_COMMAND})
message(STATUS "Using LTO-enabled ar: ${CMAKE_AR}")
endif()
if(LTO_RANLIB_COMMAND)
set(CMAKE_RANLIB ${LTO_RANLIB_COMMAND})
message(STATUS "Using LTO-enabled ranlib: ${CMAKE_RANLIB}")
endif()
endif()
endif (WHOLE_PROG_OPTIM)
# native instruction set tuning
option (WITH_NATIVE "Use native instruction set" ON)
if (WITH_NATIVE)
check_cxx_accepts_flag ("-mtune=native" HAVE_MTUNE)
if (HAVE_MTUNE)
list (APPEND _opt_flags "-mtune=native")
endif (HAVE_MTUNE)
endif (WITH_NATIVE)
# default optimization flags, if not set by user
set_default_option (CXX _opt_dbg "-O0" "(^|\ )-O")
set_default_option (CXX _opt_rel "-O3" "(^|\ )-O")
# use these options for debug builds - no optimizations
add_options (ALL_LANGUAGES "${_prof_DEBUG}" ${_opt_dbg} "-DDEBUG")
# use these options for release builds - full optimization
add_options (ALL_LANGUAGES "${_prof_RELEASE}" ${_opt_rel} ${_opt_flags})
option(WITH_NDEBUG "Disable asserts in release mode" OFF)
if(NOT WITH_NDEBUG)
add_options (ALL_LANGUAGES "${_prof_RELEASE}" -UNDEBUG)
endif()
else ()
# default information from system
foreach (lang IN ITEMS C CXX Fortran)
if (lang STREQUAL "Fortran")
set (_lang F)
else (lang STREQUAL "Fortran")
set (_lang ${lang})
endif (lang STREQUAL "Fortran")
foreach (profile IN ITEMS DEBUG RELEASE)
if (NOT CMAKE_${lang}_FLAGS_${profile})
add_options (${lang} "${_prof_${profile}}"
"$ENV{${_lang}FLAGS} ${CMAKE_${lang}_FLAGS_${profile}_INIT}")
endif (NOT CMAKE_${lang}_FLAGS_${profile})
endforeach (profile)
endforeach (lang)
endif ()
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