[Buildroot] [PATCH 3/3] pkgconf: Configure using pkgconf-personality

[Yann E. MORIN]

Thomas, All,

On 2019-10-02 09:14 +0100, Thomas Preston spake thusly:
> On 01/10/2019 13:41, Thomas Preston wrote:
> > The correct way to configure pkgconf when cross-compiling is to use
> > pkgconf-personality, rather than using environment variables. The
> > personality is selected with a symbolic link mechanism, which we now use
> > in the pkg-config wrapper script.
> > 
> > Signed-off-by: Thomas Preston <thomas.preston at codethink.co.uk>
> > ---
> >  package/pkgconf/pkg-config.in      | 11 +----------
> >  package/pkgconf/pkgconf.mk         | 12 +++++++++++-
> >  package/pkgconf/target.personality |  5 +++++
> >  3 files changed, 17 insertions(+), 11 deletions(-)
> >  create mode 100644 package/pkgconf/target.personality
> > 
> > diff --git a/package/pkgconf/pkg-config.in b/package/pkgconf/pkg-config.in
> > index 894069c492..51db4d87e1 100644
> > --- a/package/pkgconf/pkg-config.in
> > +++ b/package/pkgconf/pkg-config.in
> > @@ -1,12 +1,3 @@
> >  #!/bin/sh
> >  PKGCONFDIR=$(dirname $0)
> > -DEFAULT_PKG_CONFIG_SYSTEM_LIBRARY_PATH=${PKGCONFDIR}/../@STAGING_SUBDIR@/usr/lib
> > -DEFAULT_PKG_CONFIG_SYSTEM_INCLUDE_PATH=${PKGCONFDIR}/../@STAGING_SUBDIR@/usr/include
> > -DEFAULT_PKG_CONFIG_LIBDIR=${PKGCONFDIR}/../@STAGING_SUBDIR@/usr/lib/pkgconfig:${PKGCONFDIR}/../@STAGING_SUBDIR@/usr/share/pkgconfig
> > -DEFAULT_PKG_CONFIG_SYSROOT_DIR=${PKGCONFDIR}/../@STAGING_SUBDIR@
> > -
> > -PKG_CONFIG_SYSTEM_LIBRARY_PATH=${PKG_CONFIG_SYSTEM_LIBRARY_PATH:-${DEFAULT_PKG_CONFIG_SYSTEM_LIBRARY_PATH}} \
> > -	PKG_CONFIG_SYSTEM_INCLUDE_PATH=${PKG_CONFIG_SYSTEM_INCLUDE_PATH:-${DEFAULT_PKG_CONFIG_SYSTEM_INCLUDE_PATH}} \
> > -	PKG_CONFIG_LIBDIR=${PKG_CONFIG_LIBDIR:-${DEFAULT_PKG_CONFIG_LIBDIR}} \
> > -	PKG_CONFIG_SYSROOT_DIR=${PKG_CONFIG_SYSROOT_DIR:-${DEFAULT_PKG_CONFIG_SYSROOT_DIR}} \
> > -	exec ${PKGCONFDIR}/pkgconf @STATIC@ "$@"
> > +exec ${PKGCONFDIR}/@GNU_TARGET_NAME at -pkg-config @STATIC@ "$@"
> 
> In fact, according to @kaniini (pkgconf maintainer), we can do away with this
> wrapper script entirely and let the default symlink `pkg-config -> pkgconf`
> load the default.personality. Which can be configured for the buildroot target.

We've already tried to look into the personality feature in the past,
and we concluded back then that we could not easily use it. I don't
remember everything about the reasons, but at least one issue is that
packages do not expect the TUPPLE-pkg-config mechanism, and most do just
call 'pkg-config', so we'd still need to keep our pkg-config wrapper
anyway. As such, using the personality was not so much interesting...

But maybe things have changed now...

Regards,
Yann E. MORIN.

> Perhaps there could be a host-pkg-config symlink too (and host.personality),
> replacing much of HOST_MAKE_ENV in package/Makefile.in. Where:
> 
> 	PKG_CONFIG_HOST_BINARY = $(HOST_DIR)/bin/host-pkg-config
> 
> I think it's easier to tell how buildroot has set up pkgconf from this kind of
> configuration.
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