[Bug middle-end/15345] [3.4 Regression] [non-unit-at-a-time] unreferenced nested inline functions not optimized away

["jakub at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Additional Comments From jakub at gcc dot gnu dot org  2004-07-19 14:11 -------
This bug is IMHO very severe, it makes GCC 3.4.x totally unusable for glibc
builds as it almost doubles the size of the dynamic linker.
Can't this decision be reconsidered?

It worked just fine until GCC 3.3.x because of the DECL_DEFER_OUTPUT setting
in rest_of_compilation (now rest_of_handle_inlining).

I have played with:
--- gcc/toplev.c.jj        2004-02-20 19:37:45.000000000 +0100
+++ gcc/toplev.c    2004-07-19 15:50:30.985366840 +0200
@@ -2714,9 +2714,13 @@ rest_of_handle_inlining (tree decl)
             for unreferenced symbols.  See g77.f-torture/execute/980520-1.f.
             But removing this line from the check breaks all languages that
             use the call graph to output symbols.  This hard-coded check is
-            the least invasive work-around.  */
+            the least invasive work-around.
+            C nested functions need to be deferred here too, otherwise
+            they will be emitted even when never used.  */
          && (flag_inline_functions
-             || strcmp (lang_hooks.name, "GNU F77") == 0)
+             || strcmp (lang_hooks.name, "GNU F77") == 0
+             || (strcmp (lang_hooks.name, "GNU C") == 0
+                 && DECL_CONTEXT (decl)))
          && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
               && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
               && ! flag_keep_inline_functions)

Honza, can you see what problems could this cause?

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15345