[CLN-list] cmake & pkg-config

[Alexei Sheplyakov]

Hello,

On Wed, Oct 26, 2011 at 10:02:04AM +0200, David van der Spoel wrote:

> I'm using CLN within a large software package and trying to build it
> with cmake. Just before I put a lot of effort in it, did someone try
> to make a "Findcln.cmake" script already? It would help to have
> pkg-config support for this as well, e.g. to get the gmp library
> linked in automatically.

include(FindPkgConfig)
pkg_check_modules(cln REQUIRED cln>=1.2.2)
include_directories(${cln_INCLUDE_DIRS})
link_directories({cln_LIBRARY_DIRS})

# On ELF systems (such as GNU/Linux) this prevents the infamous `error
# while loading shared libraries: libfoo.so: cannot open shared object
# file: no such file or directory'
set(CMAKE_INSTALL_RPATH_USE_LINK_RPATH TRUE)
list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${cln_LIBRARY_DIRS}" isSystemDir)
if("${isSystemDir}" STREQUAL "-1")
	set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_RPATH}:${cln_LIBRARY_DIRS}")
endif()

# Tell CMake to link target(s) with CLN
target_link_libraries(hello ${cln_LIBRARIES})

Note: the above code is rather unorthodox, as CMake refers libraries by their
absolute path, and does not trust pkg-config (I don't think any of these is
a good idea, but that's how things work with CMake). Also, rpath should be
configurable (so whoever makes deb/rpm packages won't write you hate mails), etc.

> If no-one did it before I will do it myself. It would be nice if it
> got incorporated in the cln distribution in that case.

I'm working on CMake based build system for GiNaC (and CLN), Find* will be
written as a side effect.

Best regards,
	Alexei