buildsys: meson: implement update-map-file target

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/461>

scripts/generate-map-file.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Generator for linker version script.
+# We use the same linker version script for all public .so files
+#
+# generate-map-file.sh where-is/map-file public_interface_1.h public_interface_2.h ... public_interface_N.h
+#
+
+CTAGS_IDENTIFIER_LIST="PA_GCC_MALLOC,PA_GCC_ALLOC_SIZE2,PA_GCC_ALLOC_SIZE,PA_GCC_PURE,PA_GCC_CONST,PA_GCC_DEPRECATED,PA_GCC_PRINTF_ATTR"
+
+print_map_file() {
+    echo "PULSE_0 {"
+    echo "global:"
+    ctags -I ${CTAGS_IDENTIFIER_LIST} -f - --c-kinds=p "$@" | awk '/^pa_/ { print $1 ";" }' | sort
+    echo "local:"
+    echo "*;"
+    echo "};"
+}
+
+TARGET_FILE=$1
+shift
+
+cd "${MESON_SOURCE_ROOT}/${MESON_SUBDIR}" && print_map_file "$@" > ${TARGET_FILE}

src/pulse/meson.build

@@ -72,7 +72,11 @@ if glib_dep.found()
   libpulse_headers += 'glib-mainloop.h'
 endif
 
-versioning_link_args = '-Wl,-version-script=' + join_paths(meson.source_root(), 'src', 'map-file')
+run_target('update-map-file',
+  command : [ join_paths(meson.source_root(), 'scripts/generate-map-file.sh'), 'map-file',
+              [ libpulse_headers, 'simple.h', join_paths(meson.build_root(), 'src', 'pulse', 'version.h') ] ])
+
+versioning_link_args = '-Wl,-version-script=' + join_paths(meson.source_root(), 'src', 'pulse', 'map-file')
 
 libpulse = shared_library('pulse',
   libpulse_sources,