pkgconf: Always keep system libs

Normally pkgconf ignores the system include and system lib directories,
which is useful because it allows the correct ordering of -I, -isystem
and compiler default search paths. However, many packages use libtool,
which relies on pkgconf to print the system libs dirs in order to locate
the Libtool Archive (.la) files.

Instead of adding PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 to each of these
packages, just allow system libs globally in the pkg-config wrapper.
This allows libtool to find the .la files, and retains the correct
include ordering.

Fixes (at least):
- http://autobuild.buildroot.org/results/a79e0487135ad90530595d5c6ecc32f9c8cea7c4/
- http://autobuild.buildroot.net/results/089/08952dbf89bf3c49da7697943441cee411940420/

Signed-off-by: Thomas Preston <thomas.preston@codethink.co.uk>
---
 package/pkgconf/pkg-config.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Hello Thomas,

On Thu, 21 Nov 2019 18:36:59 +0000, Thomas Preston <thomas.preston@codethink.co.uk> wrote:

> Normally pkgconf ignores the system include and system lib directories,
> which is useful because it allows the correct ordering of -I, -isystem
> and compiler default search paths. However, many packages use libtool,
> which relies on pkgconf to print the system libs dirs in order to locate
> the Libtool Archive (.la) files.
>
> Instead of adding PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 to each of these
> packages, just allow system libs globally in the pkg-config wrapper.
> This allows libtool to find the .la files, and retains the correct
> include ordering.
>
> Fixes (at least):
> - http://autobuild.buildroot.org/results/a79e0487135ad90530595d5c6ecc32f9c8cea7c4/
> - http://autobuild.buildroot.net/results/089/08952dbf89bf3c49da7697943441cee411940420/
>
> Signed-off-by: Thomas Preston <thomas.preston@codethink.co.uk>

In favour of a general pgkconf solution (instead fixing individual packages) and
tested for the libv4l and gmpc cases, you can add my

Tested-by: Peter Seiderer <ps.report@gmx.net>

Only nitpick for the subject line s/Always/always/...

Regards,
Peter

> ---
>  package/pkgconf/pkg-config.in | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/package/pkgconf/pkg-config.in b/package/pkgconf/pkg-config.in
> index f411eb0926..e5a23a10f7 100644
> --- a/package/pkgconf/pkg-config.in
> +++ b/package/pkgconf/pkg-config.in
> @@ -9,4 +9,4 @@ PKG_CONFIG_LIBDIR=${PKG_CONFIG_LIBDIR:-${DEFAULT_PKG_CONFIG_LIBDIR}} \
>  	PKG_CONFIG_SYSROOT_DIR=${PKG_CONFIG_SYSROOT_DIR:-${DEFAULT_PKG_CONFIG_SYSROOT_DIR}} \
>  	PKG_CONFIG_SYSTEM_INCLUDE_PATH=${PKG_CONFIG_SYSTEM_INCLUDE_PATH:-${DEFAULT_PKG_CONFIG_SYSTEM_INCLUDE_PATH}} \
>  	PKG_CONFIG_SYSTEM_LIBRARY_PATH=${PKG_CONFIG_SYSTEM_LIBRARY_PATH:-${DEFAULT_PKG_CONFIG_SYSTEM_LIBRARY_PATH}} \
> -	exec ${PKGCONFDIR}/pkgconf @STATIC@ "$@"
> +	exec ${PKGCONFDIR}/pkgconf --keep-system-libs @STATIC@ "$@"

Hey,

On 24/11/2019 18:42, Peter Seiderer wrote:
> Hello Thomas,
> 
> On Thu, 21 Nov 2019 18:36:59 +0000, Thomas Preston <thomas.preston@codethink.co.uk> wrote:
> 
>> Normally pkgconf ignores the system include and system lib directories,
>> which is useful because it allows the correct ordering of -I, -isystem
>> and compiler default search paths. However, many packages use libtool,
>> which relies on pkgconf to print the system libs dirs in order to locate
>> the Libtool Archive (.la) files.
>>
>> Instead of adding PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 to each of these
>> packages, just allow system libs globally in the pkg-config wrapper.
>> This allows libtool to find the .la files, and retains the correct
>> include ordering.
>>
>> Fixes (at least):
>> - http://autobuild.buildroot.org/results/a79e0487135ad90530595d5c6ecc32f9c8cea7c4/
>> - http://autobuild.buildroot.net/results/089/08952dbf89bf3c49da7697943441cee411940420/
>>
>> Signed-off-by: Thomas Preston <thomas.preston@codethink.co.uk>
> 
> In favour of a general pgkconf solution (instead fixing individual packages) and
> tested for the libv4l and gmpc cases, you can add my
> 
> Tested-by: Peter Seiderer <ps.report@gmx.net>
> 
> Only nitpick for the subject line s/Always/always/...
> 

Thanks for testing and reviewing Peter, I've sent a v2.