[RFC] meson needs a pkg-config wrapper script

[Joel Winarske <joel.winarske@gmail.com>]

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Meson does not expose PKG_CONFIG_SYSROOT_DIR to the pkg-config process.

Currently meson.cross as generated in meson.bbclass points directly to the
pkg-config executable (no wrapper script).

PKG_CONFIG_SYSROOT_DIR behaves like a simple string prepend to all package
config variable queries.  So if you want to determine the absolute path of
a variable in .pc you set PKG_CONFIG_SYSROOT_DIR and make your query.
Currently this is not possible with Yocto+Meson.

I think a simple wrapper script would resolve this.  This is from
https://autotools.io/pkgconfig/cross-compiling.html:

#!/bin/sh

SYSROOT=/build/root

export PKG_CONFIG_PATH=
export PKG_CONFIG_LIBDIR=${SYSROOT}/usr/lib/pkgconfig:${SYSROOT}/usr/share/pkgconfig
export PKG_CONFIG_SYSROOT_DIR=${SYSROOT}

exec pkg-config "$@"


The wrapper script would be generated per recipe via meson.bbclass,
meson.cross would then reference this wrapper instead of the pkg-config
executable.

Thoughts?


Joel

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