libmudflap emits a global initializer that registers memory ranges for global data symbols. However, even if IPA decides not to emit a symbol because it's unused, we'd still emit registration sequences for them in some cases, which, in the PR testcase, would result in TOC references to the undefined symbols.
This patch fixes the problem, avoiding registration for symbols that are not present in the varpool. Regstrapped on x86_64-linux-gnu and i686-linux-gnu; I've also verified that it removes the TOC references on a ppc64-linux-gnu cross. Ok to install?
don't let mudflap register global symbols that won't be emitted From: Alexandre Oliva <aol...@redhat.com> for gcc/ChangeLog PR libmudflap/53359 * tree-mudflap.c (mudflap_finish_file): Skip deferred decls not found in the symtab. --- gcc/tree-mudflap.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/gcc/tree-mudflap.c b/gcc/tree-mudflap.c index 90d0448..a9caaf2 100644 --- a/gcc/tree-mudflap.c +++ b/gcc/tree-mudflap.c @@ -1335,6 +1335,10 @@ mudflap_finish_file (void) if (! TREE_PUBLIC (obj) && ! TREE_ADDRESSABLE (obj)) continue; + /* If we're not emitting the symbol, don't register it. */ + if (!symtab_get_node (obj)) + continue; + if (! COMPLETE_TYPE_P (TREE_TYPE (obj))) { warning (OPT_Wmudflap,
-- Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/ You must be the change you wish to see in the world. -- Gandhi Be Free! -- http://FSFLA.org/ FSF Latin America board member Free Software Evangelist Red Hat Brazil Compiler Engineer