Re: [Vala] Preprocessor defines via Meson or valac

[Guillaume Poirier-Morency <guillaumepoiriermorency gmail com>]

Those arguments are passed straight to the C compiler.

Le ven. 6 déc. 2019, à 18 h 10, xydarcher 163 com <xydarcher 163 com> a
écrit :

> Is that means the args passed to compile_args in dependency would be
> treated as vala_args when vala language is used?
>
> ------------------------------
> xydarcher 163 com
>
>
> *From:* Guillaume Poirier-Morency via vala-list <vala-list gnome org>
> *Date:* 2019-12-07 01:32
> *To:* Ken Gilmer <kgilmer gmail com>
> *CC:* vala-list <vala-list gnome org>
> *Subject:* Re: [Vala] Preprocessor defines via Meson or valac
> If I can suggest a small improvement, you could use the
> declare_dependency mechanism to add the definition only to the targets
> that link against libfuse:
>
>    libfuse_dep = dependency('libfuse')
>    libfuse26_dep = declare_dependency(dependencies: [libfuse_dep].
>                                       compile_args: '-
>    DFUSE_USE_VERSION=26')
>
>    executable('mount', 'mount.c', dependencies: [libfuse26_dep])
>
> Le vendredi 06 décembre 2019 à 07:37 -0800, Ken Gilmer a écrit :
> > Thank you Guillaume!  For reference this line in my meson.build file
> > allowed me to define a preprocessor symbol as desired:
> >
> > add_project_arguments('-DFUSE_USE_VERSION=26', language: 'c')
> >
> >
> > On Thu, Dec 5, 2019 at 11:45 PM Guillaume Poirier-Morency via vala-
> > list <vala-list gnome org> wrote:
> > > Le jeudi 05 décembre 2019 à 22:13 -0800, Ken Gilmer via vala-list a
> > > écrit :
> > > > Hello!
> > > >
> > > > I am trying to bind to libfuse from a Vala program.  I see that
> > > in
> > > > libfuse
> > > > I must specify a define to the version of the API I want to
> > > > use[4].  I read
> > > > the Vala documentation as to how to define a symbol[3].  I see
> > > that
> > > > there
> > > > is documentation in meson for how to add arguments to valac[1]
> > > but
> > > > when I
> > > > set my flag, add_project_arguments('-D FUSE_USE_VERSION=26',
> > > > language:
> > >
> > > Try to split the arguments in two or remove the space between '-D'
> > > and
> > > 'FUSE_USE_VERSION=26'.
> > >
> > > Like mentioned elsewhere, you will have to set language: 'c' for
> > > this
> > > case to work.
> > >
> > > > 'vala'), valac complains that it doesn't recognize the option and
> > > in
> > > > the
> > > > build output panel in Gnome Builder it appears to wrap the
> > > expression
> > > > in
> > > > single quotes.  When run valac directly from the command line and
> > > > sidestep
> > > > meson, it seems that the define is ignored[2]. As a sanity test,
> > > if I
> > > > modify the header to define the value, I get the behavior I want.
> > > >
> > > > My question is, how can I set a preprocessor symbol to a specific
> > > > value via
> > > > Meson or valac?
> > > >
> > > > TIA!
> > > > ken
> > > >
> > > > 1: https://mesonbuild.com/Vala.html <
> > > > https://mesonbuild.com/Vala.html#>
> > > > 2: valac -D FUSE_USE_VERSION=26 --pkg fuse --pkg gobject-2.0 --
> > > pkg
> > > > glib-2.0
> > > > main.vala
> > > > 3: https://wiki.gnome.org/Projects/Vala/Manual/Preprocessor
> > > > 4:
> https://github.com/libfuse/libfuse/blob/fuse_2_9_bugfix/include/fuse.h#L16
> > > > _______________________________________________
> > > > vala-list mailing list
> > > > vala-list gnome org
> > > > https://mail.gnome.org/mailman/listinfo/vala-list
> --
> Guillaume Poirier-Morency <guillaumepoiriermorency gmail com>
>
> Programmeur analyste en bioinformatique au laboratoire Michael Smith
> Étudiant à la maîtrise en informatique à l'Université de Montréal
>
> Mon blog: https://arteymix.github.io/
> Clé PGP: B1AD6EA5
>
>
> _______________________________________________
> vala-list mailing list
> vala-list gnome org
> https://mail.gnome.org/mailman/listinfo/vala-list

-- 
Guillaume Poirier-Morency <guillaumepoiriermorency gmail com>

Étudiant à la maîtrise en informatique à l'Université de Montréal
Chercheur à l'Institut de recherche en immunologie et en cancérologie

*Page Web:* arteymix.github.io
*Clé PGP:* B1AD6EA5
<https://pgp.mit.edu/pks/lookup?op=vindex&search=0x1CCFC3A2B1AD6EA5>