[cmake-developers] [PATCH] New module FindLibDl

[Chuck Atkins]

Hi Roger,


> However, do I still need to independently check for <dlfcn.h>?

How do I know that I have a working dlopen?


dlopen defined in dlfcn.h is part of POSIX so generally if you're on a *nix
system then you can rely on it being there.  The associated library,
however, is a different story, hence CMAKE_DL_LIBS.  So then your code
would be:

----- Begin fooUnix.c -----
...
#include <dlfcn.h>
...
void foo()
{
  void *dl = dlopen(...);
  ...
}
...
----- End fooUnix.c -----

----- Begin CMakeLists.txt -----
...
if(UNIX)
   add_library(FooLib fooUnix.c)
  if(CMAKE_DL_LIBS)
    target_link_libraries(FooLib ${CMAKE_DL_LIBS})
  endif()
endif()
...
----- End CMakeLists.txt -----

which is actually overkill since you could avoid the if(CMAKE_DL_LIBS)
check entirely since passing an empty library list to target_link_libraries
is still valid.


- Chuck
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/cmake-developers/attachments/20141121/10eaf472/attachment-0001.html>