Re: [Vala] Preprocessor defines via Meson or valac

[Vivien Kraus <vivien planete-kraus eu>]

Hello!

I think that the -D option only applies to the Vala pre-processor 
(https://wiki.gnome.org/Projects/Vala/Manual/Preprocessor).  I don't 
know meson, but either it uses valac to generate the C source files and 
then you need to add that option to the CFLAGS, or it does not generate 
these intermediate files and you need to add -Xcc "-D..." to the valac 
command-line.

Or you can do both if you like.

Vivien

Le ven. 6 déc. 2019 à 7:13, Ken Gilmer via vala-list 
<vala-list gnome org> 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:
> '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
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