[Buildroot] [PATCH] qt5: Disable passing of -isystem flag in CXXFLAGS

[Arnout Vandecappelle]

On 28-09-16 10:54, Alexey Brodkin wrote:
> So it all boils down to:
> 1) "pkg-config" case:
> --------------------->8--------------------
> PKG_CONFIG_LIBDIR=${PKG_CONFIG_LIBDIR:-/XXX/output/host/usr/arc-buildroot-linux-uclibc/sysroot/usr/lib/pkgconfig}
> PKG_CONFIG_SYSROOT_DIR=${PKG_CONFIG_SYSROOT_DIR:-/XXX/output/host/usr/arc-buildroot-linux-uclibc/sysroot}
> ./output/host/usr/bin/pkgconf --libs icu-i18n
> -licui18n -L/XXX/output/host/usr/arc-buildroot-linux-uclibc/sysroot/usr/lib -licuuc -licudata
> --------------------->8--------------------
> 
> 2. Pure "pkgconf" case:
> --------------------->8--------------------
> ./output/host/usr/bin/pkgconf --libs icu-i18n
> -licui18n -licuuc -licudata
> --------------------->8--------------------

 Your pure pkgconf case is using the host icu-i18n, that's why the -L flag is
missing. The host icu-i18n doesn't have a -L bit in its Libs: stanza.

 You should compare:

1) pkgconf case
PKG_CONFIG_LIBDIR=$STAGING_DIR/usr/lib/pkgconfig
PKG_CONFIG_SYSROOT_DIR=$STAGING_DIR/sysroot output/host/usr/bin/pkgconf --libs
icu-i18n
-licui18n -L$STAGING_DIR/usr/lib -licuuc -licudata

2) Real pkg-config case:
PKG_CONFIG_LIBDIR=$STAGING_DIR/usr/lib/pkgconfig
PKG_CONFIG_SYSROOT_DIR=$STAGING_DIR/sysroot /usr/bin/pkg-config --libs icu-i18n
-licui18n -licuuc -licudata

 We switched from pkg-config to pkgconf because it builds a whole lot faster
(pkg-config has a whole lot of dependencies). Obviously we give up features with
that, but this is the first one where I think it is an important feature that
we're missing.

 Regards,
 Arnout

> 
>> >  So ideally, we should patch pkgconf (and send upstream) to remove the default
>> > search paths.
> Given my comments above I'm not really sure it's pkgconf who's guilty.

-- 
Arnout Vandecappelle                          arnout at mind be
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