[Buildroot] [PATCH v5 1/2] meson: add per package optional compiler/linker flags

Thomas Petazzoni thomas.petazzoni at bootlin.com
Sat Apr 13 16:49:17 UTC 2019

Hello Peter,

On Mon,  8 Apr 2019 22:43:20 +0200
Peter Seiderer <ps.report at gmx.net> wrote:

> variables to allow per package additional compiler/linker flags.
> Signed-off-by: Peter Seiderer <ps.report at gmx.net>

I did a bit of research. Meson does accept -Dc_args and a bunch of
other options on the command line, but they are ignored when a
cross-file is used. http://mesonbuild.com/Builtin-options.html says it
clearly: "c_args, cpp_args, c_link_args, and cpp_link_args only affect
native builds, when cross compiling they will not be applied to
binaries or libraries targeting the host system, only those being run
on the build system."

There is some on-going discussion upstream about this. See

A cross_pkg_config_path option was merged:


Aparently, they are talking about possibly adding cross_c_args.

What do we do ? Wait until upstream solves the problem ? Use an
intermediate solution like yours, and later one move to another one if
upstream provides one ?

Could you at least raise the fact that the Buildroot project would also
be interested in being able to pass addition cflags/cxxflags/ldflags on
the command line, as well as passing the path of tools like
libgcrypt-config ? (See my reply to Jörg Krause's patch on this topic,
on which you are Cc'ed).

Best regards,

Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering

More information about the buildroot mailing list