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meson: add gst-full-version-script option

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Can be used to control the exact symbols exported, or not, in
libgstreamer-full.

This is useful when building a tailored libgstreamer-full aimed
to be run with some specific binaries. By using such version script
one can reduce the size of the generated lib by letting the linker
garbage collect all the unused APIs.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/195>
This commit is contained in:
Guillaume Desmottes 2020-08-11 15:49:53 +02:00 committed by GStreamer Merge Bot
parent a9731bdcb7
commit 89faf739c9
3 changed files with 21 additions and 0 deletions
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6
README.md
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@ -131,6 +131,12 @@ Since *1.20.0* `gst_init_static_plugins()` is called automatically by
`gst_init()` and applications must not call it manually any more. The header `gst_init()` and applications must not call it manually any more. The header
file has been removed from public API. file has been removed from public API.
One can use the `gst-full-version-script` option to pass a
[version script](https://www.gnu.org/software/gnulib/manual/html_node/LD-Version-Scripts.html)
to the linker. This can be used to control the exact symbols that are exported by
the gstreamer-full library, allowing the linker to garbage collect unused code
and so reduce the total library size.
This is an experimental feature, backward uncompatible changes could still be This is an experimental feature, backward uncompatible changes could still be
made in the future. made in the future.

13
meson.build
View file

@ -297,6 +297,18 @@ if get_option('default_library') == 'static'
requires = ['glib-2.0', 'gobject-2.0'] requires = ['glib-2.0', 'gobject-2.0']
endif endif
link_deps = []
if get_option('gst-full-version-script') != ''
symbol_map = meson.current_source_dir() / get_option('gst-full-version-script')
link_arg = '-Wl,--version-script=' + symbol_map
if cc.has_link_argument(link_arg)
gstfull_link_args += link_arg
else
error('Failed to link with version script (' + symbol_map + '), check logs for details')
endif
link_deps += symbol_map
endif
# Build both shared and static library # Build both shared and static library
gstfull = both_libraries('gstreamer-full-1.0', gstfull = both_libraries('gstreamer-full-1.0',
init_static_plugins_c, init_static_plugins_c,
@ -304,6 +316,7 @@ if get_option('default_library') == 'static'
link_args: gstfull_link_args, link_args: gstfull_link_args,
link_whole : exposed_libs, link_whole : exposed_libs,
dependencies : gst_dep, dependencies : gst_dep,
link_depends : link_deps,
install : true, install : true,
) )
pkgconfig.generate(gstfull, pkgconfig.generate(gstfull,

2
meson_options.txt
View file

@ -21,6 +21,8 @@ option('qt5', type : 'feature', value : 'auto', description : 'Qt5 Support')
option('custom_subprojects', type : 'string', value : '', description : 'Comma-separated project names') option('custom_subprojects', type : 'string', value : '', description : 'Comma-separated project names')
option('gst-full-libraries', type : 'array', value : [], option('gst-full-libraries', type : 'array', value : [],
description : '''List of libraries to expose in gstreamer-full's ABI. gstreamer, glib and gobject are always included.''') description : '''List of libraries to expose in gstreamer-full's ABI. gstreamer, glib and gobject are always included.''')
option('gst-full-version-script', type : 'string', value: '',
description : 'path of the version script to be used by the linker, see https://www.gnu.org/software/gnulib/manual/html_node/LD-Version-Scripts.html')
# Common options, automatically inherited by subprojects # Common options, automatically inherited by subprojects
option('tests', type : 'feature', value : 'auto', description : 'Build tests') option('tests', type : 'feature', value : 'auto', description : 'Build tests')