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[PATCH] Fix PR81940
- From: Richard Biener <rguenther at suse dot de>
- To: gcc-patches at gcc dot gnu dot org
- Date: Wed, 23 Aug 2017 14:09:47 +0200 (CEST)
- Subject: [PATCH] Fix PR81940
- Authentication-results: sourceware.org; auth=none
The following fixes PR81940 by allowing the case of missing early
debug due to compiling with -g0 and linking with -g when using LTO.
Committed as obvious.
If more intricate issues like this keep popping up another
solution is to record whether -g0 was in effect at compile-time
and override -g at link-time with that on a per function
(and variable?) basis.
Richard.
2017-08-23 Richard Biener <rguenther@suse.de>
PR lto/81940
* dwarf2out.c (dwarf2out_abstract_function): Handle LTO with
-g0 at compile-time.
* g++.dg/lto/pr81940_0.C: New testcase.
Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c (revision 251275)
+++ gcc/dwarf2out.c (working copy)
@@ -21609,7 +21578,10 @@ dwarf2out_abstract_function (tree decl)
return;
old_die = lookup_decl_die (decl);
- /* With early debug we always have an old DIE. */
+ /* With early debug we always have an old DIE unless we are in LTO
+ and the user did not compile but only link with debug. */
+ if (in_lto_p && ! old_die)
+ return;
gcc_assert (old_die != NULL);
if (get_AT (old_die, DW_AT_inline)
|| get_AT (old_die, DW_AT_abstract_origin))
Index: gcc/testsuite/g++.dg/lto/pr81940_0.C
===================================================================
--- gcc/testsuite/g++.dg/lto/pr81940_0.C (nonexistent)
+++ gcc/testsuite/g++.dg/lto/pr81940_0.C (working copy)
@@ -0,0 +1,5 @@
+// { dg-lto-do link }
+// { dg-lto-options { { -O -flto } } }
+// { dg-extra-ld-options "-r -nostdlib -g" }
+
+int a, b = a;