[Buildroot] [PATCH] package/libglib2: explicitly specify gio module path

[Yann E. MORIN <yann.morin.1998@free.fr>]

TRhomas, All,

On 2018-12-27 11:33 +0100, Thomas Petazzoni spake thusly:
> Since the switch to pkgconf 1.5.3 in commit
> 4e423669399ad8389edd81761ea5c9cc26bf312d, the glib-networking package
> has been failing to build with:
> 
> glib-networking: installs files in /home/naourr/work/instance-0/output/host/i686-buildroot-linux-uclibc/sysroot//home/naourr/work/instance-0/output
> 
> This error is due to glib-networking having installed its GIO GnuTLS
> module into an invalid location. This invalid location is
> $(DESTDIR)$(GIO_MODULE_DIR). GIO_MODULE_DIR is found by using:
> 
>   pkg-config --variable giomoduledir gio-2.0
> 
> Unfortunately, despite the pkgconf fix in commit
> 7125fc5c1a8a96ff8eee057789358702e1b55835 ("package/pkgconf: add patch
> to restore pre-1.5.3 behavior for sysroot prefixing"), the value
> returned by pkg-config for giomoduledir remains prefixed by the
> sysroot.
> 
> This is due to the fact that giomoduledir is defined by default with
> the value ${libdir}/gio/modules. When running pkg-config --variable
> giomoduledir gio-2.0 with the new pkg-config version, what happens is
> that libdir is resolved first, and libdir is one of the variable for
> which we add the sysroot prefix. Then later, giomoduledir is
> resolved. For this variable, we don't prefix with the
> sysroot. However, when resolving the value of giomoduledir, it re-uses
> the value of libdir that was already resolved, and this value includes
> the sysroot prefix.
> 
> There is no simple way to solve this problem within pkg-config. So for
> the time being, we take a simple route: make sure giomoduledir isn't
> defined in terms of ${libdir}. This is easily done by passing
> --with-gio-module-dir to libglib2 configure script.
> 
> Fixes:
> 
>   http://autobuild.buildroot.net/results/4167159c4a03f5a72dbd7e286aedb3845164cc22/
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> ---
>  package/libglib2/libglib2.mk | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/package/libglib2/libglib2.mk b/package/libglib2/libglib2.mk
> index 67db5ac359..b112b84f99 100644
> --- a/package/libglib2/libglib2.mk
> +++ b/package/libglib2/libglib2.mk
> @@ -112,9 +112,14 @@ HOST_LIBGLIB2_DEPENDENCIES = \
>  	host-util-linux \
>  	host-zlib
>  
> +# We explicitly specify a giomodule-dir to avoid having a value
> +# containing ${libdir} in gio-2.0.pc. Indeed, a value depending on
> +# ${libdir} would be prefixed by the sysroot by pkg-config, causing a
> +# bogus installation path once combined with $(DESTDIR).
>  LIBGLIB2_CONF_OPTS = \
>  	--with-pcre=system \
> -	--disable-compile-warnings
> +	--disable-compile-warnings \
> +	--with-gio-module-dir=/usr/lib/gio/modules

The default is indeed '${libdir}/gio/modules' (with single quotes!):
    https://gitlab.gnome.org/GNOME/glib/blob/master/configure.ac#L1612

Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Regards,
Yann E. MORIN.

>  ifneq ($(BR2_ENABLE_LOCALE),y)
>  LIBGLIB2_DEPENDENCIES += libiconv
> -- 
> 2.20.1
> 

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