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| [[CMake_User_Contributed_Macros|Back]]
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| I have several projects that depend on the presence of certain arguments to various flags. If the user accidentally removes them, I want to forcefully put them back in while preserving any additional arguments the user may have added. The following macro is helpful for doing this. The operation is similar to a set union, but I don't deal with duplicates in either set.
| | This page has moved [https://gitlab.kitware.com/cmake/community/wikis/contrib/macros/ForceAddFlags here]. |
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| <pre>
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| # This will add arguments not found in ${parameter} to the end. It
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| # does not attempt to remove duplicate arguments already existing in
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| # ${parameter}.
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| MACRO(FORCE_ADD_FLAGS parameter)
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| # Create a separated list of the arguments to loop over
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| SET(p_list ${${parameter}})
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| SEPARATE_ARGUMENTS(p_list)
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| # Make a copy of the current arguments in ${parameter}
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| SET(new_parameter ${${parameter}})
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| # Now loop over each required argument and see if it is in our
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| # current list of arguments.
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| FOREACH(required_arg ${ARGN})
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| # This helps when we get arguments to the function that are
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| # grouped as a string:
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| #
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| # ["-O3 -g"] instead of [-O3 -g]
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| SET(TMP ${required_arg}) #elsewise the Seperate command doesn't work)
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| SEPARATE_ARGUMENTS(TMP)
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| FOREACH(option ${TMP})
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| # Look for the required argument in our list of existing arguments
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| SET(found FALSE)
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| FOREACH(p_arg ${p_list})
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| IF (${p_arg} STREQUAL ${option})
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| SET(found TRUE)
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| ENDIF (${p_arg} STREQUAL ${option})
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| ENDFOREACH(p_arg)
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| IF(NOT found)
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| # The required argument wasn't found, so we need to add it in.
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| SET(new_parameter "${new_parameter} ${option}")
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| ENDIF(NOT found)
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| ENDFOREACH(option ${TMP})
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| ENDFOREACH(required_arg ${ARGN})
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| SET(${parameter} ${new_parameter} CACHE STRING "" FORCE)
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| ENDMACRO(FORCE_ADD_FLAGS)
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| </pre>
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| Here is an example script using the macro.
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| <pre>
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| SET(flags "")
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| MESSAGE("flags = ${flags}")
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| MESSAGE("forcing: -g3 -msse")
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| FORCE_ADD_FLAGS(flags -g3 -msse)
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| MESSAGE("flags = ${flags}")
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| MESSAGE("forcing: \"-msse -msse2\" -O3")
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| FORCE_ADD_FLAGS(flags "-msse -msse2" -O3)
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| MESSAGE("flags = ${flags}")
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| MESSAGE("forcing: -g3")
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| FORCE_ADD_FLAGS(flags -g3)
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| MESSAGE("flags = ${flags}")
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| </pre>
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| Here's the output.
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| <pre>
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| flags =
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| forcing: -g3 -msse
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| flags = -g3 -msse
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| forcing: "-msse -msse2" -O3
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| flags = -g3 -msse -msse2 -O3
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| forcing: -g3
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| flags = -g3 -msse -msse2 -O3
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| </pre>
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| Note that forcing a particular argument only adds it if it isn't already present and any previous arguments are left intact.
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| {{CMake/Template/Footer}}
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| [[Category:CMakeMacro]]
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