[llvmgcc] C front-end does not compile "extern inline" into linkonce

[lattner]

Bugzilla Link	182
Resolution	FIXED
Resolved on	Mar 06, 2010 14:00
Version	1.0
OS	All
Blocks	llvm/llvm-bugzilla-archive#202

Extended Description

llvmgcc currently compiles "extern inline" functions into "weak" linkage,
instead of linkonce linkage, preventing the optimizer from deleting the bodies
of unreferenced functions.

Testcase here: test/Regression/CFrontend/2003-12-14-ExternInlineSupport.c.tr

Another testcase:
--- test.c
#include <gmp.h>

$ llvmgcc test.c -c -o - | llvm-dis

-Chris

[lattner]

assigned to @lattner

[lattner]

Here's a fix:

$ diff -u llvm-expand.c~ llvm-expand.c
--- llvm-expand.c~ 2003-12-14 12:25:33.000000000 -0600
+++ llvm-expand.c 2004-01-08 10:53:45.000000000 -0600
@@ -6164,7 +6164,7 @@
if (!TREE_PUBLIC(subr) || lang_hooks.llvm_is_in_anon(subr))
Fn->Linkage = L_Internal;
else if (DECL_COMDAT(subr) ||

•       /* Are these two necessary?? */
  

•       (DECL_DECLARED_INLINE_P(subr) && DECL_EXTERNAL(subr)) ||
        (DECL_DECLARED_INLINE_P(subr) && DECL_ONE_ONLY(subr))) {
  

  Fn->Linkage = L_LinkOnce;
  } else if (DECL_WEAK(subr) || DECL_DECLARED_INLINE_P(subr) ||

[llvmbot]

mentioned in issue llvm/llvm-bugzilla-archive#202