glx: add a test to verify exported symbols

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34002>

src/glx/glvnd-symbols.txt

@@ -0,0 +1,10 @@
+__glx_Main
+MesaGLInteropGLXExportObject
+MesaGLInteropGLXFlushObjects
+MesaGLInteropGLXQueryDeviceInfo
+
+# TODO: These shouldn't be exported:
+glAreTexturesResidentEXT
+glDeleteTexturesEXT
+glGenTexturesEXT
+glIsTextureEXT

src/glx/meson.build

@@ -148,3 +148,18 @@ libgl = shared_library(
   darwin_versions : '4.0.0',
   install : true,
 )
+
+if with_symbols_check
+  libgl_symbols_file = with_glvnd ? 'glvnd-symbols.txt' : 'libgl-symbols.txt'
+
+  test(
+    'libGL-ABI-check',
+    symbols_check,
+    args : [
+      '--lib', libgl,
+      '--symbols-file', files(libgl_symbols_file),
+      symbols_check_args,
+    ],
+    suite : ['glx'],
+  )
+endif