Re: [Qemu-devel] [PATCH] pkg-config: Add a pkg-config script for cross compilations

[Paolo Bonzini <pbonzini@redhat.com>]

On 09/11/2011 08:47 PM, Stefan Weil wrote:
> Well, Redhat has a large interest in QEMU, so I assume that Fedora
> is better prepared for cross compilations than most other distributions.

Why are the two related? :)  Fedora's cross compilation machinery is 
indeed used by Red Hat for some virt-related stuff, but not for QEMU 
even though I used it successfully for it.  In fact, Fedora-mingw32 
started as a special interest group entirely outside Red Hat.

> Does it also provide cross glib-2.0, sdl, zlib, ...?

Yes.

> How does it implement cross pkg-config? As a binary compiled from source,
> or as a script using native pkg-config?

It's a script doing basically

PKG_CONFIG_LIBDIR="/usr/i686-pc-mingw32/sys-root/mingw/lib/pkgconfig:/usr/i686-pc-mingw32/sys-root/mingw/share/pkgconfig" 
pkg-config "$@"

> How about other distributions? Are there others beside Fedora
> with good cross dev support? Some large embedded projects still build
> their own cross toolchain instead of using precompiled binaries.
> For all those which don't have a cross pkg-config, the script
> saves the time and memory needed for building it.

Yes, I agree.  However, I still think it's better to prepare 
documentation about how to cross compile (including fetching 
dependencies etc.), and embed the script in the document.

Paolo