[CMake] how to detect architecture ?

[Chuck Atkins]

Hi Franck,

I'd suggest going a little more robust by using both
CMAKE_SHARED_LIBRARY_PREFIX and CMAKE_SHARED_LIBRARY_SUFFIX to generate a
function at configure time to resolve the correct filename.

For example, util.h.in:

#ifndef _UTIL_H_
#define _UTIL_H_

#include <stdio.h>

static inline
void get_library_filename(char* filename, const char* libname)
{
  sprintf(filename, "@CMAKE_SHARED_LIBRARY_PREFIX@
%s at CMAKE_SHARED_LIBRARY_SUFFIX@", libname);
}

#endif /* _UTIL_H_ */


Then your CMakeLists.txt:

configure_file(
  ${CMAKE_CURRENT_SOURCE_DIR}/util.h.in
  ${CMAKE_CURRENT_BINARY_DIR}/util.h
  @ONLY
)
add_executable(foo main.c ${CMAKE_CURRENT_BINARY_DIR}/util.h)
target_include_directories(foo PRIVATE ${CMAKE_CURRENT_BINARY_DIR})

And finally main.c:

#include <stdio.h>
#include <util.h>

int main(int argc, char **argv)
{
  char filename[256];

  get_library_filename(filename, "foo");

  printf("Library foo uses file %s\n", filename);

  return 0;
}

This will give you "libfoo.so" on Linux, "libfoo.dylib" on Apple, and "
foo.dll" on Windows.


----------
Chuck Atkins
Staff R&D Engineer, Scientific Computing
Kitware, Inc.


On Tue, Jan 9, 2018 at 10:04 AM, Franck Houssen <franck.houssen at inria.fr>
wrote:

> Thanks !
>
> ----- Mail original -----
> > De: "Konstantin Tokarev" <annulen at yandex.ru>
> > À: "Franck Houssen" <franck.houssen at inria.fr>, "CMake Mail List" <
> cmake at cmake.org>
> > Envoyé: Mardi 9 Janvier 2018 16:00:55
> > Objet: Re: [CMake] how to detect architecture ?
> >
> >
> >
> > 09.01.2018, 17:58, "Franck Houssen" <franck.houssen at inria.fr>:
> > > Is there a way to detect architecture ?
> > >
> > > Seems there is nothing simple since these old threads :
> > > https://stackoverflow.com/questions/11944060/how-to-
> detect-target-architecture-using-cmake/12024211#12024211
> > > https://stackoverflow.com/questions/16796629/cmake-
> create-architecture-aware-makefile
> > >
> > > Is there a solution now ?
> > >
> > > My need is quite simple: I have an executable who needs dlopen. To
> test it,
> > > I planned to write a bash script that would have done "./exe
> > > /path/to/lib.so" on linux (debian, ...) OR "./exe /path/to/lib.dylib"
> on
> > > osx. To replace correctly so/dylib in the bash script I need to know
> the
> > > architecture. Any idea how to do this ?
> >
> > ${CMAKE_SHARED_LIBRARY_SUFFIX}
> >
>
> Oh man ! Didn't know this one : exactly what I was looking for
>
> > > Franck
> > > ,--
> > >
> > > Powered by www.kitware.com
> > >
> > > Please keep messages on-topic and check the CMake FAQ at:
> > > http://www.cmake.org/Wiki/CMake_FAQ
> > >
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> more
> > > information on each offering, please visit:
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> >
> > --
> > Regards,
> > Konstantin
> >
> --
>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
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>
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> information on each offering, please visit:
>
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