meson: Make private static library symbols local

Static libraries are not affected by our symbol file, so private symbols
are globally visible by default.

Use objcopy to make symbols that we do not want to expose local.

Closes: https://github.com/swaywm/wlroots/issues/1892
Closes: https://github.com/swaywm/wlroots/issues/2952

1 files changed, 22 insertions, 0 deletions

diff --git a/meson.build b/meson.build
index 36bf6e8b..6c6b2b23 100644
--- a/meson.build
+++ b/meson.build
@@ -150,8 +150,30 @@ lib_wlr = library(
 	install: true,
 	link_args: symbols_flag,
 	link_depends: symbols_file,
+	prelink: true,
 )
 
+if get_option('default_library') != 'shared'
+	lib_target = lib_wlr
+	if get_option('default_library') == 'both'
+		lib_target = lib_wlr.get_static_lib()
+	endif
+	objcopy_prog = find_program('objcopy', native: true)
+	custom_target('libwlroots',
+		input: lib_target,
+		output: lib_target.name() + '.is-stripped',
+		capture: true,
+		command: [
+			objcopy_prog.full_path(), '-w',
+			'--localize-symbol=!wlr_*',
+			'--localize-symbol=!_wlr_*',
+			'--localize-symbol=*',
+			'@INPUT@',
+		],
+		build_by_default: true,
+	)
+endif
+
 wlr_vars = {}
 foreach name, have : features
 	wlr_vars += { 'have_' + name.underscorify(): have.to_string() }