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| author | Franz Sirl <Franz.Sirl-kernel@lauterbach.com> | 2002-04-28 18:31:34 +0000 |
|---|---|---|
| committer | Franz Sirl <sirl@gcc.gnu.org> | 2002-04-28 18:31:34 +0000 |
| commit | 45806a3fd4f324c7050b26980f282e1a4ef8961e (patch) | |
| tree | bf07a3136b537dc0844e7c227d87d6ade6e858ef /gcc/c-pragma.c | |
| parent | 32c8d10081ea8d106b1bf83f0ce13480c9e36910 (diff) | |
| download | gcc-45806a3fd4f324c7050b26980f282e1a4ef8961e.zip gcc-45806a3fd4f324c7050b26980f282e1a4ef8961e.tar.gz gcc-45806a3fd4f324c7050b26980f282e1a4ef8961e.tar.bz2 | |
re PR c/6343 (attribute((weak)) not working on second declaration)
2002-04-28 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
PR c/6343
* c-decl.c (duplicate_decls): Call merge_weak.
* c-pragma.c (apply_pragma_weak): Warn about misuse.
* output.h (merge_weak): Prototype merge_weak.
* varasm.c (merge_weak): New function.
(declare_weak): Make sure we don't give an error on VAR_DECLs.
Mark RTL with SYMBOL_REF_WEAK.
cp:
* decl.c (duplicate_decls): Call merge_weak.
testsuite:
* gcc.dg/weak-[2-7].c: New tests.
From-SVN: r52844
Diffstat (limited to 'gcc/c-pragma.c')
| -rw-r--r-- | gcc/c-pragma.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/c-pragma.c b/gcc/c-pragma.c index 4bf7ce2..d5df355 100644 --- a/gcc/c-pragma.c +++ b/gcc/c-pragma.c @@ -287,6 +287,10 @@ apply_pragma_weak (decl, value) decl_attributes (&decl, build_tree_list (get_identifier ("alias"), build_tree_list (NULL, value)), 0); + if (SUPPORTS_WEAK && DECL_EXTERNAL (decl) && TREE_USED (decl) + && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) + warning_with_decl (decl, "applying #pragma weak `%s' after first use results in unspecified behavior"); + declare_weak (decl); } |