[CMake] novice question: modification of FLAGS rule variable?

[Glenn Coombs]

What you can do however is set the variable which uses the <FLAGS>
definition, i.e. CMAKE_C_COMPILE_OBJECT in your example.  I have a
CMakeLists.txt file where I override the default assembler flags:

set(CMAKE_ASM-ATT_COMPILE_OBJECT "<CMAKE_ASM-ATT_COMPILER> ${ASM_SYS_FLAGS}
-o <OBJECT> <SOURCE>")

to use what is set in my ASM_SYS_FLAGS variable instead of the default
<FLAGS> one.  I'm not sure but I think you are supposed to set these sort of
variables early on in a CMakeList.txt before the project() or
enable_language() commands.  Also, I think that later changes to the
ASM_SYS_FLAGS variable are ignored.

--
Glenn

On 5 September 2011 19:53, David Cole <david.cole at kitware.com> wrote:

> On Mon, Sep 5, 2011 at 1:31 PM, David Dunkle <ddunkle at arxan.com> wrote:
> > Is it possible to read and to set a property/rule variable like <FLAGS>?
> > What syntax would I use to do that? I mean <FLAGS> as it, for example,
> > appears here:
> >
> >
> >
> > set(CMAKE_C_COMPILE_OBJECT "${target_compiler} -c <FLAGS> -o <OBJECT>")
> >
> >
> >
> > For example can I do something like this (this is pseudo code)?
> >
> >
> >
> > #read
> >
> > set(MY_FLAGS,  ${<FLAGS>} );
> >
> >
> >
> > …
> >
> >
> >
> > #set
> >
> > set(<FLAGS>, ${MY_FLAGS});
> >
> >
> >
> > In the documentation, here:
> >
> >
> >
> > http://cmake.org/Wiki/CMake_Useful_Variables#Expansion_Rules
> >
> >
> >
> > it hints at this being possible but doesn’t explain, at least not so that
> I
> > understand.
> >
> >
> >
> > Thanks,
> >
> > -David
> >
> >
> >
> >
> >
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>
> The wiki page is simply misleading. You cannot set those from the
> CMake language. CMake decides on their values in internal code, and
> then substitutes appropriately when generating make files or
> solution/project files for the build system.
>
> You can set things the "CMAKE_CXX_FLAGS" which eventually get
> translated into the substitution that CMake performs, but you cannot
> alter "<FLAGS>" in the rules variables.
>
>
> HTH,
> David
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the CMake FAQ at:
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>
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