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Re: [PATCH] Fix PR56982, handle setjmp like non-local labels

Richard Biener <> writes:

> 	PR tree-optimization/56982
> 	* builtins.def (BUILT_IN_LONGJMP): longjmp is not a leaf
> 	function.
> 	* gimplify.c (gimplify_call_expr): Notice special calls.
> 	(gimplify_modify_expr): Likewise.
> 	* tree-cfg.c (make_abnormal_goto_edges): Handle setjmp-like
> 	abnormal control flow receivers.
> 	(call_can_make_abnormal_goto): Handle cfun->calls_setjmp
> 	in the same way as cfun->has_nonlocal_labels.
> 	(gimple_purge_dead_abnormal_call_edges): Likewise.
> 	(stmt_starts_bb_p): Make setjmp-like abnormal control flow
> 	receivers start a basic-block.

This breaks libgo.

../../../gcc/libgo/runtime/proc.c: In function âruntime_mcall.constprop.7â:
../../../gcc/libgo/runtime/proc.c:419:13: error: â({anonymous})â may be used uninitialized in this function [-Werror=maybe-uninitialized]


Andreas Schwab,
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"And now for something completely different."

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