Found the problem. It's nothing to do with _FORTIFY_SOURCE, and those
intructions indexing off r2 are to do with -fstack-check so no problem
there either.
Fixed as follows. Incidentally this bug was triggered by fixing the
obvious bug in no_global_regs_above
Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c (revision 152105)
+++ gcc/config/rs6000/rs6000.c (working copy)
@@ -16148,7 +16148,7 @@ rs6000_emit_prologue (void)
int using_store_multiple;
int using_static_chain_p = (cfun->static_chain_decl != NULL_TREE
&& df_regs_ever_live_p (STATIC_CHAIN_REGNUM)
- && !call_used_regs[STATIC_CHAIN_REGNUM]);
+ && call_used_regs[STATIC_CHAIN_REGNUM]);
HOST_WIDE_INT sp_offset = 0;
if (TARGET_FIX_AND_CONTINUE)
--
mountall fails, broken (powerpc?) gcc?
https://bugs.launchpad.net/bugs/432222
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