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

[Peter Seiderer <ps.report@gmx.net>]

Hello Thomas,

On Tue, 23 Apr 2019 20:45:55 +0200, Peter Seiderer <ps.report@gmx.net> wrote:

> Hello Thomas,
> 
> On Sat, 13 Apr 2019 18:49:17 +0200, Thomas Petazzoni <thomas.petazzoni@bootlin.com> wrote:
> 
> > Hello Peter,
> > 
> > On Mon,  8 Apr 2019 22:43:20 +0200
> > Peter Seiderer <ps.report@gmx.net> wrote:
> >   
> > > Add LIBFOO_MESON_CFLAGS, LIBFOO_MESON_LDFLAGS and LIBFOO_MESON_CXXFLAGS
> > > variables to allow per package additional compiler/linker flags.
> > > 
> > > Signed-off-by: Peter Seiderer <ps.report@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
> > https://github.com/mesonbuild/meson/issues/4767.
> > 
> > A cross_pkg_config_path option was merged:
> > 
> >   https://github.com/mesonbuild/meson/commit/91b2475e30d7659dad24eb35b47e4d098c716792
> > 
> > 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 ?  
> 
> Use the per package cross-compilation.conf with the enhanced flags setting
> solution ;-), maybe it is the canonical solution because the compiler etc.
> binaries and other settings for cross compile are already given via this
> config file, why not all other settings (maybe unfamiliar for long term
> autotools users, used to the 'easy' (1) way of quick overwrite some compile
> flags/parameters)? 
> 
> > 
> > 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 J?rg Krause's patch on this topic,
> > on which you are Cc'ed).  
> 
> O.k., will try to give some input on the upstream discussion...

Finally done, see [1]

Regards,
Peter

[1] https://github.com/mesonbuild/meson/issues/4767#issuecomment-488424402

> 
> Regards,
> Peter
> 
> (1) maybe newbies would call it magic
> 
> > 
> > Best regards,
> > 
> > Thomas  
> 
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