[CMake] set_target_properties to target openmp flag on an executable

[Eric Noulard]

2011/3/18 Caner Candan <caner at candan.fr>:
> Hi all,
>
> Since I have several targets to compile, I was looking for a way to
> set some specific flags to one target among all others. In my example
> I would like to set the openmp flag to the target test and I got an
> error with the code below:
>
> ----------------------------------------------------------------------------------------------
> PROJECT(test CXX)
> ADD_EXECUTABLE(test test.cpp)
> SET_TARGET_PROPERTIES(test PROPERTIES COMPILE_FLAGS "-fopenmp")
> ----------------------------------------------------------------------------------------------
>
> Error:
> ----------------------------------------------------------------------------------------------
> [100%] Building CXX object CMakeFiles/test.dir/test.cpp.o
> Linking CXX executable test
> CMakeFiles/test.dir/test.cpp.o: In function `main':
> test.cpp:(.text+0x29): undefined reference to `GOMP_parallel_start'
> test.cpp:(.text+0x3a): undefined reference to `GOMP_parallel_end'
> collect2: ld returned 1 exit status
> make[2]: *** [test] Error 1
> make[1]: *** [CMakeFiles/test.dir/all] Error 2

Don't you need the same flags for linking?
see the "LINK_FLAGS" property.

-- 
Erk
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