[CMake] COMPILE_FLAGS property that appends instead of replaces

[Robert Dailey]

Thanks.

This seems to work:


set_property( TARGET foo APPEND_STRING PROPERTY
COMPILE_FLAGS "/ZI "
)

set_property( TARGET foo APPEND_STRING PROPERTY
COMPILE_FLAGS "/W4 "
)

Just make sure you have a space at the end of each one, so that when the
strings are appended, there is a space between each compiler flag.

---------
Robert Dailey


On Mon, Feb 6, 2012 at 4:13 PM, <aaron.meadows at thomsonreuters.com> wrote:

> *I believe that is the defined behavior.  Usually, people would use
> add_definitions() to add the flags before creating the target.  If you have
> one target per subdirectory, you don’t have to worry about removing them
> afterwards:*
>
> * *
>
> *CMakeLists.txt:*
>
> *   add_definitions(/foo)*
>
> * *
>
> *   add_subdirectory(baz)*
>
> *   add_subdirectory(qux)*
>
> * *
>
> *baz/CMakeLists.txt*
>
> *   add_definitions(/bar)*
>
> *   add_executable(baz baz.cpp)*
>
> * *
>
> *qux/CMakeLists.txt*
>
> *   add_executable(qux qux.cpp)*
>
> * *
>
> * *
>
> *baz gets the compiler flags “/foo /bar”, qux only gets “/foo”.*
>
> * *
>
> * *
>
> * *
>
> *As an aside, I ran into a similar issue, but with Linker Flags in the
> cache.  To overcome that, I wrote a few functions to encapsulate the
> writing of flags and handle checking for duplicates.  You could certainly
> do something similar with properties:*
>
> * *
>
> *############################################################*
>
> *## Cache Set Helper Functions*
>
> *############################################################*
>
> *function(AppendIfMissing _outVar _inVar _value)*
>
> *  string(REGEX REPLACE " " ";" _inList "${${_inVar}}")*
>
> *  list(FIND _inList "${_value}" _pos)*
>
> * *
>
> *  if(${_pos} EQUAL -1)*
>
> *    set(${_outVar} "${${_inVar}} ${_value}" PARENT_SCOPE)*
>
> *  else()*
>
> *    set(${_outVar} "${${_inVar}}" PARENT_SCOPE)*
>
> *  endif()*
>
> *endfunction(AppendIfMissing)*
>
> * *
>
> *function(CheckAndAppendCacheForce _varName _value _type )*
>
> *  AppendIfMissing(_outvar ${_varName} ${_value})*
>
> * *
>
> *  foreach(_arg IN LISTS ARGN)*
>
> *    set(_desc "${_desc} ${_arg}")*
>
> *  endforeach()*
>
> * *
>
> *  set(${_varName} "${_outvar}" CACHE ${_type} "${_desc}" FORCE)*
>
> *endfunction(CheckAndAppendCacheForce)*
>
> * *
>
> *function(CheckAndAppendCache _varName _value _type )*
>
> *  AppendIfMissing(_outvar ${_varName} ${_value})*
>
> * *
>
> *  foreach(_arg IN LISTS ARGN)*
>
> *    set(_desc "${_desc} ${_arg}")*
>
> *  endforeach()*
>
> * *
>
> *  set(${_varName} "${_outvar}" CACHE ${_type} "${_desc}")*
>
> *endfunction(CheckAndAppendCache)*
>
> * *
>
> * *
>
> *Aaron Meadows*****
>
> * *
>
> *From:* cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] *On
> Behalf Of *Robert Dailey
> *Sent:* Monday, February 06, 2012 3:58 PM
> *To:* CMake ML
> *Subject:* [CMake] COMPILE_FLAGS property that appends instead of replaces
> ****
>
> ** **
>
> I would like to set the COMPILE_FLAGS property multiple times on the same
> target through set_target_properties(), however only the last call seems to
> persist. Previous flags set get overridden. Is this the correct behavior?
> If so, is there a way to make this property append instead of replace on
> the same target?
> ****
>
> ** **
>
> ---------****
>
> Robert Dailey****
>
> This email was sent to you by Thomson Reuters, the global news and
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> individual sender, except where the sender specifically states them to be
> the views of Thomson Reuters.
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