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If this is set, then everything is lumped into CMAKE_CXX_FLAGS since that is the only one that is going to be used when building anyway.
103 lines
3.8 KiB
CMake
103 lines
3.8 KiB
CMake
# - Add options without repeating them on the command line
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#
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# Synopsis:
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#
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# add_options (lang build opts)
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#
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# where:
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#
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# lang Name of the language whose compiler should receive the
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# options, e.g. CXX. If a comma-separated list is received
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# then the option is added for all those languages. Use the
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# special value ALL_LANGUAGES for these languages: CXX, C
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# and Fortran
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#
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# build Kind of build to which this options should apply,
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# such as DEBUG and RELEASE. This can also be a comma-
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# separated list. Use the special value ALL_BUILDS to apply
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# to all builds.
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#
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# opts List of options to add. Each should be quoted.
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#
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# Example:
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#
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# add_options (CXX RELEASE "-O3" "-DNDEBUG" "-Wall")
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function (add_options langs builds)
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# special handling of empty language specification
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if ("${langs}" STREQUAL "ALL_LANGUAGES")
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set (langs CXX C Fortran)
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endif ("${langs}" STREQUAL "ALL_LANGUAGES")
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foreach (lang IN LISTS langs)
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# prepend underscore if necessary
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foreach (build IN LISTS builds)
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if (NOT ("${build}" STREQUAL "ALL_BUILDS"))
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set (_bld "_${build}")
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string (TOUPPER "${_bld}" _bld)
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else (NOT ("${build}" STREQUAL "ALL_BUILDS"))
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set (_bld "")
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endif (NOT ("${build}" STREQUAL "ALL_BUILDS"))
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# if we want everything in the "global" flag, then simply
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# ignore the build type here and go add everything to that one
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if (CMAKE_NOT_USING_CONFIG_FLAGS)
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set (_bld "")
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endif ()
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foreach (_opt IN LISTS ARGN)
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set (_var "CMAKE_${lang}_FLAGS${_bld}")
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#message (STATUS "Adding \"${_opt}\" to \${${_var}}")
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# remove it first
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string (REPLACE "${_opt}" "" _without "${${_var}}")
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string (STRIP "${_without}" _without)
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# we need to strip this one as well, so they are comparable
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string (STRIP "${${_var}}" _stripped)
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# if it wasn't there, then add it at the end
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if ("${_without}" STREQUAL "${_stripped}")
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# don't add any extra spaces if no options yet are set
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if (NOT ${_stripped} STREQUAL "")
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set (${_var} "${_stripped} ${_opt}")
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else (NOT ${_stripped} STREQUAL "")
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set (${_var} "${_opt}")
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endif (NOT ${_stripped} STREQUAL "")
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set (${_var} "${${_var}}" PARENT_SCOPE)
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endif ("${_without}" STREQUAL "${_stripped}")
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endforeach (_opt)
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endforeach (build)
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endforeach (lang)
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endfunction (add_options lang build)
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# set varname to flag unless user has specified something that matches regex
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function (set_default_option lang varname flag regex)
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# lang is either C, CXX or Fortran
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if ("${lang}" STREQUAL "Fortran")
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set (letter "F")
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else ()
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set (letter "${lang}")
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endif ()
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string (TOUPPER "${CMAKE_BUILD_TYPE}" _build)
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if ((NOT ("$ENV{${letter}FLAGS}" MATCHES "${regex}"))
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AND (NOT ("${CMAKE_${lang}_FLAGS}" MATCHES "${regex}"))
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AND (NOT ("${CMAKE_${lang}_FLAGS_${_build}}" MATCHES "${regex}")))
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set (${varname} ${flag} PARENT_SCOPE)
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else ()
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set (${varname} PARENT_SCOPE)
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endif ()
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endfunction (set_default_option)
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# clear default options as a proxy for not using any default options
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# at all. there is one *huge* problem with this: CMake runs the platform
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# initialization before executing any line at all in the project and
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# there seems to be no way to disable that behaviour, so we cannot really
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# distinguish between a platform default and something that the user has
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# passed on the command line. the best thing we can do is to all user-
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# defined setting if they are something other than the platform default.
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macro (no_default_options)
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foreach (lang IN ITEMS C CXX Fortran)
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foreach (build IN ITEMS DEBUG RELEASE MINSIZEREL RELWITHDEBINFO)
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if ("${CMAKE_${lang}_FLAGS_${build}}" STREQUAL "${CMAKE_${lang}_FLAGS_${build}_INIT}")
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# for some strange reason we cannot clear this flag, only set it to empty
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set (CMAKE_${lang}_FLAGS_${build} "")
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endif ()
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endforeach (build)
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endforeach (lang)
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endmacro (no_default_options)
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