https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70594
Bug ID: 70594
Summary: [6 Regression] -fcompare-debug failure
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: burnus at gcc dot gnu.org
CC: ppalka at gcc dot gnu.org
Target Milestone: ---
No example as I failed to reduce one; I also tried to use a reduced set of
flags; this set worked on the original file - but not on the delta-reduced
file. All of those point to a memory-related issue. Interestingly, with
-save-temps it didn't occur while w/o -save-temps, the result differed as
follows (two lines shifted down by five lines):
--- /tmp/ccRrTlry.gkd 2016-04-08 09:12:27.463899521 +0200
+++ /tmp/ccV2i7s5.gk.gkd 2016-04-08 09:12:35.739842097 +0200
@@ -74901,2 +74900,0 @@
-29: void yyreduce = <<< error >>>;
-1861: void yyerrlab = <<< error >>>;
@@ -74906,0 +74905,2 @@
+29: void yyreduce = <<< error >>>;
+1861: void yyerrlab = <<< error >>>;
Bisecting GCC points to Patrick Palka's commit r234753:
Fix PR c++/70452 (regression in C++ parsing performance)
gcc/cp/ChangeLog:
PR c++/70452
* constexpr.c (struct fundef_copy): New struct.
(struct fundef_copies_table_t): New struct.
(fundef_copies_table): New static variable.
(maybe_initialize_fundef_copies_table): New static function.
(get_fundef_copy): New static function.
(save_fundef_copy): New static function.
(cxx_eval_call_expression): Use get_fundef_copy, and
save_fundef_copy.
(constexpr_call_table): Add "deletable" GTY marker.
gcc/testsuite/ChangeLog:
PR c++/70452
* g++.dg/ext/constexpr-vla4.C: New test.
