[CMake] compiling single source with different flags

[Bart]

Thanks for those suggestions, I was on that path, but I can not get it to work properly:

foo$ cmake .
-- Configuring done
-- Generating done
-- Build files have been written to: /home/bart/foo
foo$ make
Scanning dependencies of target foo
make[2]: *** No rule to make target ` /home/bart/foo/foo_int.c', needed by `CMakeFiles/foo.dir/_/home/bart/foo/foo_int.c.o'.  Stop.
make[1]: *** [CMakeFiles/foo.dir/all] Error 2
make: *** [all] Error 2
foo$ ls foo_int.c 
foo_int.c
foo$ 


---------------------------
File: CMakeLists.txt
---------------------------
PROJECT(foo)

# There will be more than one source file..
SET(LIBSOURCES foo)

foreach(libsrc ${LIBSOURCES})

set(DST_I "${CMAKE_CURRENT_SOURCE_DIR}/${libsrc}_int.c")
set(DST_L "${CMAKE_CURRENT_SOURCE_DIR}/${libsrc}_long.c")

set(SRC "${CMAKE_CURRENT_SOURCE_DIR}/${libsrc}.c")

CONFIGURE_FILE(${SRC} ${DST_I} COPYONLY)
CONFIGURE_FILE(${SRC} ${DST_L} COPYONLY)

SET(LIBSOURCES_I "${LIBSOURCES_I} ${DST_I}")
SET(LIBSOURCES_L "${LIBSOURCES_L} ${DST_L}")

endforeach(libsrc)

SET_SOURCE_FILES_PROPERTIES({LIBSOURCES_I} PROPERTIES COMPILE_FLAGS "-DDINT")
SET_SOURCE_FILES_PROPERTIES({LIBSOURCES_L} PROPERTIES COMPILE_FLAGS "-DDLONG")
SET_SOURCE_FILES_PROPERTIES(${LIBSOURCES_I} PROPERTIES GENERATED true)
SET_SOURCE_FILES_PROPERTIES(${LIBSOURCES_L} PROPERTIES GENERATED true)

ADD_LIBRARY( foo ${LIBSOURCES_I} ${LIBSOURCES_L})

If I remove the generated property lines, cmake can not find the generated source files, either way there is 
a problem with the dependencies as generated from my CMakeList.

Thanks for the help.



On Dec 29, 2009, at 12:52, Michael Wild wrote:

> 
> On 29. Dec, 2009, at 21:44 , Eric Noulard wrote:
> 
>> 2009/12/29 Richard Wackerbarth <richard at nfsnet.org>:
>>> Not as a "real" solution, but more as a "workaround", you could create a "derived source file" which is just a copy of the source file and then you would have two separate files to be compiled with the appropriate flags.
>> 
>> That's one solution, see below for more information.
>> 
>>> On Dec 29, 2009, at 2:22 PM, Bart wrote:
>>> 
>>>> Hi,
>>>> 
>>>> I'm trying to find a way to build a library with two different instances of the same source file.
>>>> for example I would like to compile foo.c with -DDINT into foo_int.o and with -DDLONG into foo_long.o
>>>> and have both objects added to the same library libfoo.a
>>>> 
>>>> I have experimented with custom command to generate the source files (which did not work), and would have still
>>>> left me with how to compile them with different -D flags.
>> 
>> Same kind of question has been asked on the ML recently,
>> may be you can re-read the thread
>> http://www.cmake.org/pipermail/cmake/2009-December/033813.html
>> 
> 
> Or you can use CONFIGURE_FILE to create "wrappers" which #include the actual source file. If it's always the same flags, you can do it statically, using something like this:
> 
> wrap_foo.c:
> /* -------------------------- */
> /* clean up */
> #ifdef DINT
> #undef DINT
> #endif
> #ifdef DLONG
> #undef DLONG
> #endif
> 
> /* compile for int */
> #define DINT
> #include "foo.c"
> #undef DINT
> 
> /* compile for long */
> #define DLONG
> #include "foo.c"
> #endif 
> /* -------------------------- */
> 
> Michael
> 
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