Even before this pull request it was required to set PKG_CONFIG_PATH
when cross compiling since pkg-config always searches for native
libraries. This would require to backup an already existing ENV
variable if present, detect the distro specific place the pkgconfig folder is,
and restore the original ENV variable if it was present. Cmake as shown in:
.
http://www.cmake.org/gitweb?p=cmake.git;a=commitdiff;h=3df51470
.
added support for this but requires CMAKE_MINIMUM_REQUIRED_VERSION as 3.1
which is kind of strict since it was released 10 days ago.
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To avoid the ugliness let just avoid pkg-config when cross compiling. This
means only EGL, SDL2 and GTK3 have to be updated since the rest work w/o
pkg-config.
- EGL is fixed with PR #409
- SDL2 is fixed here and it's trivial.
- GTK3 is non-trivial. For this one use pkg-config for native builds since
the .pc file is kept up to date automatically. For cross compilation
use the provided FindGTK3 which I made by using the sed documented
inside the file and updating the dependencies for GTK3. Since I checked
each and every single .pc file to make sure they are up to date this
should have the same behaviour as pkg-config. Prefer the .pc files for
native builds since it does not need to be manually updated and when
the native 64bit port gets finished all the cross compile options should
be removed which is quite easy since most of the code got moved to the
CMAKE_TOOLCHAIN_FILE.
Note:
Cmake Modules are BSD-3-clause therefore GPL compatible.
* link common with c lib (required for gold linker)
* fix the macro to properly set the library variable
=> use the variable instead to hardcoded value
Gregory Hainaut