From 33ca5c92dfa7e2f591a838bb768d9d6eea56793b Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Wed, 1 Mar 2023 10:01:10 +0100 Subject: debug/108772 - ICE with late debug generated with -flto When combining -g1 with -flto we run into the DIE location annotation machinery for globals calling dwarf2out_late_global_decl but not having any early generated DIE for function scope statics. In this process we'd generate a limbo DIE since also the function scope doesn't have any early generated DIE. The limbo handling then tries to force a DIE for the context chain which ultimatively fails and ICEs at the std namespace decl because at -g1 we don't represent that. The following avoids this situation by making sure to never generate any DIEs from dwarf2out_late_global_decl in the in_lto_p path for function scope globals but rely on DIE generation for the function to output a DIE for the local static (which doesn't happen for -g1). I explored a lot of other options to fix this but in the end this seems to be the most spot-on fix with the least risk of unwanted effects. PR debug/108772 * dwarf2out.cc (dwarf2out_late_global_decl): Do not generate a DIE for a function scope static. * g++.dg/lto/pr108772_0.C: New testcase. --- gcc/dwarf2out.cc | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'gcc/dwarf2out.cc') diff --git a/gcc/dwarf2out.cc b/gcc/dwarf2out.cc index 1f39df3..1711ad2 100644 --- a/gcc/dwarf2out.cc +++ b/gcc/dwarf2out.cc @@ -27282,7 +27282,10 @@ dwarf2out_late_global_decl (tree decl) /* We may have to generate full debug late for LTO in case debug was not enabled at compile-time or the target doesn't support the LTO early debug scheme. */ - if (! die && in_lto_p) + if (! die && in_lto_p + /* Function scope variables are emitted when emitting the + DIE for the function. */ + && ! local_function_static (decl)) dwarf2out_decl (decl); else if (die) { -- cgit v1.1