[Bug 994402] [NEW] combining -fprofile-generate and -fmudflap causes gcc to segfault

[Pauli]

Public bug reported:

$ cat minimal.c 
#include <stdint.h>

#define PERF_MAX_STACK_DEPTH            255

struct perf_callchain_entry {
	uint64_t                           nr;
	uint64_t                           ip[PERF_MAX_STACK_DEPTH];
};


struct perf_callchain_entry entry = {
	.nr = 0,
};

int main(void)
{
	int i;
	volatile unsigned long long x;
	for (i = 0; i < entry.nr; i++)
		x = entry.ip[i];

	return 0;
}

$ gcc-4.4 -fmudflap -fprofile-generate -c minimal.c -o minimal.o
$ gcc-4.6 -fmudflap -fprofile-generate -c minimal.c -o minimal.o
$ gcc-4.7 -fmudflap -fprofile-generate -c minimal.c -o minimal.o (actually gcc-snapshot but same efffect)
minimal.c: In function '_GLOBAL__sub_I_00099_1_entry':
minimal.c:23:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-snapshot/README.Bugs> for instructions.
Preprocessed source stored into /tmp/cckrXkkP.out file, please attach this to your bugreport.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gcc-snapshot 20111010-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Fri May  4 08:38:23 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gcc-snapshot
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gcc-defaults (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric running-unity

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https://bugs.launchpad.net/bugs/994402

Title:
  combining -fprofile-generate and -fmudflap causes gcc to segfault

Status in “gcc-defaults” package in Ubuntu:
  New

Bug description:
  $ cat minimal.c 
  #include <stdint.h>

  #define PERF_MAX_STACK_DEPTH            255

  struct perf_callchain_entry {
  	uint64_t                           nr;
  	uint64_t                           ip[PERF_MAX_STACK_DEPTH];
  };

  
  struct perf_callchain_entry entry = {
  	.nr = 0,
  };

  int main(void)
  {
  	int i;
  	volatile unsigned long long x;
  	for (i = 0; i < entry.nr; i++)
  		x = entry.ip[i];

  	return 0;
  }

  $ gcc-4.4 -fmudflap -fprofile-generate -c minimal.c -o minimal.o
  $ gcc-4.6 -fmudflap -fprofile-generate -c minimal.c -o minimal.o
  $ gcc-4.7 -fmudflap -fprofile-generate -c minimal.c -o minimal.o (actually gcc-snapshot but same efffect)
  minimal.c: In function '_GLOBAL__sub_I_00099_1_entry':
  minimal.c:23:1: internal compiler error: Segmentation fault
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-snapshot/README.Bugs> for instructions.
  Preprocessed source stored into /tmp/cckrXkkP.out file, please attach this to your bugreport.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gcc-snapshot 20111010-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
  Uname: Linux 3.0.0-17-generic x86_64
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  Date: Fri May  4 08:38:23 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: gcc-snapshot
  UpgradeStatus: No upgrade log present (probably fresh install)

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