[Buildroot] [PATCH v2 1/2] package/pkg-meson.mk: add FOO_MESON_EXTRA_PROPERTIES

[Yann E. MORIN <yann.morin.1998@free.fr>]

John, All,

On 2020-03-11 11:22 +0000, John Keeping spake thusly:
> With autoconf packages, we often specify ac_cv_func_... cached values to
> avoid runtime checks during configure.  With meson the equivalent is
> setting properties in cross-compilation.conf which we cannot do in
> Buildroot at the moment.
> 
> For example, libglib2 used to set ac_cv_func_printf_unix98 and
> ac_cv_func_vsnprintf_c99 so that the system printf could be used, but
> with the conversion to meson these checks fail and the gnulib fallback
> is used.
> 
> Add infrastructure in the same way as FOO_MESON_EXTRA_BINARIES to allow
> per-package modification to the cross-compilation properties.
> 
> Signed-off-by: John Keeping <john@metanate.com>
> Reviewed-by: Peter Seiderer <ps.report@gmx.net>

Applied to master, after I changed the code to do a single substitution
as in a1e3c7b693. Thanks!

Regards,
Yann E. MORIN.

> ---
> v2:
> - Reword documentation on the format of _MESON_EXTRA_PROPERTIES entries
> - Add Peter's reviewed-by - thanks!
> ---
>  docs/manual/adding-packages-meson.txt | 9 +++++++++
>  package/pkg-meson.mk                  | 4 ++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/docs/manual/adding-packages-meson.txt b/docs/manual/adding-packages-meson.txt
> index e84bf7f60a..029c8c2488 100644
> --- a/docs/manual/adding-packages-meson.txt
> +++ b/docs/manual/adding-packages-meson.txt
> @@ -116,6 +116,15 @@ will therefore only use a few of them.
>    single quotes. By default, empty. Note that Buildroot already sets the
>    correct values for +c+, +cpp+, +ar+, +strip+, and +pkgconfig+.
>  
> +* +FOO_MESON_EXTRA_PROPERTIES+, to specify a space-separated list of
> +  properties to add to the `[properties]` section of the meson
> +  `cross-compilation.conf` configuration file. The format is
> +  `property-name=<value>` with no space around the +=+ sign, and with
> +  single quotes around string values. By default, empty. Note that
> +  Buildroot already sets values for +needs_exe_wrapper+, +c_args+,
> +  +c_link_args+, +cpp_args+, +cpp_link_args+, +sys_root+, and
> +  +pkg_config_libdir+.
> +
>  * +FOO_NINJA_ENV+, to specify additional environment variables to pass to
>    +ninja+, meson companion tool in charge of the build operations. By default,
>    empty.
> diff --git a/package/pkg-meson.mk b/package/pkg-meson.mk
> index 6ac3f79fe9..4df1326cad 100644
> --- a/package/pkg-meson.mk
> +++ b/package/pkg-meson.mk
> @@ -80,6 +80,10 @@ define $(2)_CONFIGURE_CMDS
>  		$$(foreach x,$$($(2)_MESON_EXTRA_BINARIES), \
>  	            s:$$$$:\n$$(x): ; \
>  		) }" \
> +	    -e "/^\[properties\]$$$$/ { \
> +		$$(foreach x,$$($(2)_MESON_EXTRA_PROPERTIES), \
> +		    s:$$$$:\n$$(x): ; \
> +		) }" \
>  	    package/meson/cross-compilation.conf.in \
>  	    > $$($$(PKG)_SRCDIR)/build/cross-compilation.conf
>  	PATH=$$(BR_PATH) $$($$(PKG)_CONF_ENV) $$(MESON) \
> -- 
> 2.25.1
> 
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