http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52642
Bug #: 52642 Summary: SH Target: libstdc++ failures due to call insn swapped before prologue frame insns Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target AssignedTo: unassig...@gcc.gnu.org ReportedBy: olege...@gcc.gnu.org CC: kkoj...@gcc.gnu.org Target: sh*-*-* Carry over from PR 51244 comment #33 ... Looking into the libstdc++ failures for sh4-unknown-linux-gnu, it seems that the call insn was swapped before prologue frame insns and then it makes unwinder confused. -fno-delayed-branch also stops that swapping for these failing cases. The patch below works for me. * config/sh/sh.c (sh_expand_prologue): Emit blockage at the end of prologue for unwinder and profiler. --- ORIG/trunk/gcc/config/sh/sh.c 2012-03-06 10:28:32.000000000 +0900 +++ trunk/gcc/config/sh/sh.c 2012-03-14 20:22:15.000000000 +0900 @@ -7234,6 +7234,13 @@ sh_expand_prologue (void) emit_insn (gen_shcompact_incoming_args ()); } + /* If we are profiling, make sure no instructions are scheduled before + the call to mcount. Similarly if some call instructions are swapped + before frame related insns, it'll make unwinder confused because + currently SH has no unwind info for function epilogues. */ + if (crtl->profile || flag_exceptions || flag_unwind_tables) + emit_insn (gen_blockage ()); + if (flag_stack_usage_info) current_function_static_stack_size = stack_usage; }