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# - Add options without repeating them on the command line
#
# Synopsis:
#
# add_options (lang build opts)
#
# where:
#
# lang Name of the language whose compiler should receive the
# options, e.g. CXX. If a comma-separated list is received
# then the option is added for all those languages. Use the
# special value ALL_LANGUAGES for these languages: CXX, C
# and Fortran
#
# build Kind of build to which this options should apply,
# such as DEBUG and RELEASE. This can also be a comma-
# separated list. Use the special value ALL_BUILDS to apply
# to all builds.
#
# opts List of options to add. Each should be quoted.
#
# Example:
#
# add_options (CXX RELEASE "-O3" "-DNDEBUG" "-Wall")
function(add_options langs builds)
# special handling of empty language specification
if("${langs}" STREQUAL "ALL_LANGUAGES")
set(langs CXX C Fortran)
endif()
foreach(lang IN LISTS langs)
# prepend underscore if necessary
foreach(build IN LISTS builds)
if(NOT ("${build}" STREQUAL "ALL_BUILDS"))
set(_bld "_${build}")
string(TOUPPER "${_bld}" _bld)
else()
set(_bld "")
endif()
foreach(_opt IN LISTS ARGN)
set(_var "CMAKE_${lang}_FLAGS${_bld}")
#message(STATUS "Adding \"${_opt}\" to \${${_var}}")
# remove it first
string(REPLACE "${_opt}" "" _without "${${_var}}")
string(STRIP "${_without}" _without)
# we need to strip this one as well, so they are comparable
string(STRIP "${${_var}}" _stripped)
# if it wasn't there, then add it at the end
if("${_without}" STREQUAL "${_stripped}")
# don't add any extra spaces if no options yet are set
if(NOT ${_stripped} STREQUAL "")
set(${_var} "${_stripped} ${_opt}")
else()
set(${_var} "${_opt}")
endif()
set(${_var} "${${_var}}" PARENT_SCOPE)
endif()
endforeach()
endforeach()
endforeach()
endfunction()
# set varname to flag unless user has specified something that matches regex
function(set_default_option varname flag regex)
if(NOT "$ENV{CXXFLAGS}" MATCHES "${regex}"
AND NOT "${CMAKE_CXX_FLAGS}" MATCHES "${regex}"
AND NOT "${CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}}" MATCHES "${regex}")
set(${varname} ${flag} PARENT_SCOPE)
else()
set(${varname} PARENT_SCOPE)
endif()
endfunction()
# note: this must be called before project()
macro(no_default_options)
# prevent the platform probe to set options
set(CMAKE_NOT_USING_CONFIG_FLAGS TRUE)
endmacro()
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