configure: Set PKG_CONFIG_PATH to get the right settings for the target host.

[Francois Gouget]

On Tue, 6 Jun 2017, Michael Müller wrote:

> Setting PKG_CONFIG_PATH doesn't seem like a good option for me. You
> would need to implement the path for every possible distribution and
> platform to not cause any regressions.

You may be thinking of PKG_CONFIG_LIBDIR which overrides the 
system defaults. PKG_CONFIG_PATH only prepends to the system defaults so 
that if the .pc files are not found there they are still looked up in 
all the standard places.


> On Arch Linux it is for example /usr/lib32/pkgconfig. On FreeBSD it is 
> /usr/libdata/pkgconfig/.

Maybe a few more paths will need to be added but their absence will not 
make things worse.


> Not to speak of cross compilation cases in which users might have a 
> special build of pkgconfig where overriding PKG_CONFIG_PATH doesn't 
> make any sense.

That's why PKG_CONFIG_PATH is only set if $cross_compiling is false in 
the 32 bit case. The 64 bit case does not seem to have any qualms 
forcing CC="$CC -m64" regardless of $cross_compiling so I'm aligning 
myself with that until I know why it should be different.


-- 
Francois Gouget <fgouget at codeweavers.com>