[CMake] change add_executable to add_library leads to an error

[Petr Kmoch]

Hi Cedric.

add_custom_target() does not work the way you think it does. The arguments
given after the target name are commands which the custom target will
execute. So what your custom target `statphys` does is execute a program
named `simol-statphys`. When `simol-statphys` was the name of an executable
target, CMake figured out a dependency based on this and arranged it so
that `simol-statphys` is built first and then executed.

However, when `simol-statphys` is a library target, it does not receive
this special treatment; and why would it, since you cannot execute a
library. Therefore, it simply tries to execute a program named
`simol-statphys` and, expectedly, fails.

If I understand your intention with the custom target correctly, you want
to have a shorthand alias for the target in the makefile. The correct
syntax to achieve that would be:

 add_custom_target(statphys)
 add_dependencies(statphys simol-statphys)

Hope this helps.

Petr

On Wed, Dec 23, 2015 at 2:26 PM, Cedric Doucet <cedric.doucet at inria.fr>
wrote:

>
> Hello,
>
> I have the following script:
> =================================
>
> file(GLOB_RECURSE statphys "*.cpp")
>
>
> #add_library(simol-statphys SHARED ${statphys})
> add_executable(simol-statphys ${statphys})
>
>
> add_dependencies(simol-statphys simol-core)
>
> add_custom_target(statphys simol-statphys)
>
>
> target_link_libraries(simol-statphys simol-core)
>
> target_link_libraries(simol-statphys
> ${ARMADILLO_INSTALL_DIR}/lib/libarmadillo.so)
> target_link_libraries(simol-statphys
> ${YAMLCPP_INSTALL_DIR}/lib/libyaml-cpp.a)
>
> =================================
>
>
> I would like generate a shared library simol-statphys instead of an
> executable simol-statphys.
>
> In other words, I would like to replace the call to add_executable, to the
> one which is contained in the comment below this call.
>
>
> However, if I do this, and I type
>
>
>     make statphys
>
>
> I get the following error message:
>
>
> Scanning dependencies of target statphys
> /bin/sh: 1: simol-statphys: not found
> make[3]: *** [src/modules/statphys/CMakeFiles/statphys] Erreur 127
> make[2]: *** [src/modules/statphys/CMakeFiles/statphys.dir/all] Erreur 2
> make[1]: *** [src/modules/statphys/CMakeFiles/statphys.dir/rule] Erreur 2
> make: *** [statphys] Erreur 2
>
>
> Does someone can explain me where do the problem come from?
>
>
> Cédric
>
>
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