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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug pch/61250] New: Random pch failures on x86_64-apple-darwin13.
Date: Tue, 20 May 2014 09:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61250

            Bug ID: 61250
           Summary: Random pch failures on x86_64-apple-darwin13.
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: pch
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: iains at gcc dot gnu.org
              Host: x86_64-apple-darwin13
            Target: x86_64-apple-darwin13
             Build: x86_64-apple-darwin13

When running the test suite on x86_64-apple-darwin13 with -j8 (4 cores, 8
threads), I see random failures for the tests

g++.dg/pch/pch.C 
gcc.dg/pch/save-temps-1.c

They are either an ICE:

Internal compiler error: Error reporting routines re-entered.

(may be related to pr59877), or a "program timed out" leading to an "assembly
comparison":

WARNING: program timed out.
FAIL: g++.dg/pch/pch.C  -g -I. -Dwith_PCH (test for excess errors)
FAIL: g++.dg/pch/pch.C -g assembly comparison

AFAICT these failures occur for any set of options or -m32/-m64. The number of
failures ranges from 0 to 4/5 and seems (weakly) correlated to the machine load
(-j8+backup).