e9d0216577
The CMAKE_NOT_USING_CONFIG_FLAGS option is really only settable by a user that doesn't want _DEBUG or _RELEASE flags to not have effect. If we want other flags than the platform default, we must do hairy things like clearing them from the cache (overriding the user's seletion if it was the same as the platform default).
98 lines
3.6 KiB
CMake
98 lines
3.6 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 ("${build}" STREQUAL "ALL_BUILDS"))
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foreach (_opt IN LISTS ARGN)
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set (_var "CMAKE_${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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