[Bug lto/48055] New: FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[Bug lto/48055] New: FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48055

           Summary: FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c
                    compilation,  -O2 -flto
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ubizjak@gmail.com
              Host: alphaev68-pc-linux-gnu
            Target: alphaev68-pc-linux-gnu
             Build: alphaev68-pc-linux-gnu


Recent changes cause three of ...-chk.c lto tests to fail on alpha [1]:

Executing on host: /space/uros/gcc-build/gcc/xgcc -B/space/uros/gcc-build/gcc/
/home/uros/gcc-svn/trunk/gcc/testsuite/gcc.c-torture/execute/builtins/memcpy-chk.c
/home/uros/gcc-svn/trunk/gcc/testsuite/gcc.c-torture/execute/builtins/memcpy-chk-lib.c
/home/uros/gcc-svn/trunk/gcc/testsuite/gcc.c-torture/execute/builtins/lib/main.c
 -w  -O2 -flto   -lm   -o
/space/uros/gcc-build/gcc/testsuite/gcc5/memcpy-chk.x9    (timeout = 300)
spawn /space/uros/gcc-build/gcc/xgcc -B/space/uros/gcc-build/gcc/
/home/uros/gcc-svn/trunk/gcc/testsuite/gcc.c-torture/execute/builtins/memcpy-chk.c
/home/uros/gcc-svn/trunk/gcc/testsuite/gcc.c-torture/execute/builtins/memcpy-chk-lib.c
/home/uros/gcc-svn/trunk/gcc/testsuite/gcc.c-torture/execute/builtins/lib/main.c
-w -O2 -flto -lm -o /space/uros/gcc-build/gcc/testsuite/gcc5/memcpy-chk.x9^M
/usr/lib/gcc/alpha-unknown-linux-gnu/4.4.5/../../../../alpha-unknown-linux-gnu/bin/ld:
Warning: alignment 8 of symbol `buf5' in /tmp/ccgnDykf.ltrans1.ltrans.o is
smaller than 16 in /tmp/ccc3QsSw.o.ironly^D^M
/usr/lib/gcc/alpha-unknown-linux-gnu/4.4.5/../../../../alpha-unknown-linux-gnu/bin/ld:
Warning: alignment 8 of symbol `buf7' in /tmp/ccgnDykf.ltrans1.ltrans.o is
smaller than 16 in /tmp/ccc3QsSw.o.ironly^D^M
/usr/lib/gcc/alpha-unknown-linux-gnu/4.4.5/../../../../alpha-unknown-linux-gnu/bin/ld:
Warning: alignment 8 of symbol `buf1' in /tmp/ccgnDykf.ltrans1.ltrans.o is
smaller than 16 in /tmp/ccc3QsSw.o.ironly^D^M
output is:
/usr/lib/gcc/alpha-unknown-linux-gnu/4.4.5/../../../../alpha-unknown-linux-gnu/bin/ld:
Warning: alignment 8 of symbol `buf5' in /tmp/ccgnDykf.ltrans1.ltrans.o is
smaller than 16 in /tmp/ccc3QsSw.o.ironly^D^M
/usr/lib/gcc/alpha-unknown-linux-gnu/4.4.5/../../../../alpha-unknown-linux-gnu/bin/ld:
Warning: alignment 8 of symbol `buf7' in /tmp/ccgnDykf.ltrans1.ltrans.o is
smaller than 16 in /tmp/ccc3QsSw.o.ironly^D^M
/usr/lib/gcc/alpha-unknown-linux-gnu/4.4.5/../../../../alpha-unknown-linux-gnu/bin/ld:
Warning: alignment 8 of symbol `buf1' in /tmp/ccgnDykf.ltrans1.ltrans.o is
smaller than 16 in /tmp/ccc3QsSw.o.ironly^D^M

FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation,  -O2 -flto
UNRESOLVED: gcc.c-torture/execute/builtins/memcpy-chk.c execution,  -O2 -flto

[1] http://gcc.gnu.org/ml/gcc-testresults/2011-03/msg00887.html

[Bug lto/48055] FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48055

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-10 10:18:52 UTC ---
This looks like a linker issue.  I remember seeing similar errors when
using GNU ld and not gold.

And I don't think GCC produces intermediate files named ccc3QsSw.o.ironly.

[Bug testsuite/48055] FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48055

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|lto                         |testsuite

--- Comment #2 from Uros Bizjak <ubizjak at gmail dot com> 2011-03-10 11:08:00 UTC ---
(In reply to comment #1)
> This looks like a linker issue.  I remember seeing similar errors when
> using GNU ld and not gold.
> 
> And I don't think GCC produces intermediate files named ccc3QsSw.o.ironly.

Indeed. The new warning is generated due to the upgrade to binutils-2.21.

Following testsuite patch fixes the problem:

Index: gcc.c-torture/execute/builtins/memcpy-chk.c
===================================================================
--- gcc.c-torture/execute/builtins/memcpy-chk.c    (revision 170823)
+++ gcc.c-torture/execute/builtins/memcpy-chk.c    (working copy)
@@ -78,10 +78,10 @@
     abort ();
 }

-long buf1[64];
+static long buf1[64];
 char *buf2 = (char *) (buf1 + 32);
-long buf5[20];
-char buf7[20];
+static long buf5[20];
+static char buf7[20];

 void
 __attribute__((noinline))
Index: gcc.c-torture/execute/builtins/memmove-chk.c
===================================================================
--- gcc.c-torture/execute/builtins/memmove-chk.c    (revision 170823)
+++ gcc.c-torture/execute/builtins/memmove-chk.c    (working copy)
@@ -81,10 +81,10 @@
     abort ();
 }

-long buf1[64];
+static long buf1[64];
 char *buf2 = (char *) (buf1 + 32);
-long buf5[20];
-char buf7[20];
+static long buf5[20];
+static char buf7[20];

 void
 __attribute__((noinline))
Index: gcc.c-torture/execute/builtins/mempcpy-chk.c
===================================================================
--- gcc.c-torture/execute/builtins/mempcpy-chk.c    (revision 170823)
+++ gcc.c-torture/execute/builtins/mempcpy-chk.c    (working copy)
@@ -84,10 +84,10 @@
   mempcpy_disallowed = 0;
 }

-long buf1[64];
+static long buf1[64];
 char *buf2 = (char *) (buf1 + 32);
-long buf5[20];
-char buf7[20];
+static long buf5[20];
+static char buf7[20];

 void
 __attribute__((noinline))

[Bug testsuite/48055] FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48055

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-10 11:14:41 UTC ---
Are there conflicting definitions somewhere?  Then it would indeed be a
testsuite bug.

[Bug testsuite/48055] FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48055

--- Comment #4 from Uros Bizjak <ubizjak at gmail dot com> 2011-03-10 12:09:50 UTC ---
(In reply to comment #3)
> Are there conflicting definitions somewhere?  Then it would indeed be a
> testsuite bug.

No, these are the only definitions for the particular testcase.

Re: [Bug testsuite/48055] FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[Jan Hubicka]

> No, these are the only definitions for the particular testcase.
Hmm, in every case it is GNU ld bug - the GNU ld internal ironly section should not be leaking
to user warnings. Please fill in GNU ld PR.

Honza

[Bug testsuite/48055] FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48055

--- Comment #5 from Jan Hubicka <hubicka at ucw dot cz> 2011-03-10 12:56:56 UTC ---
> No, these are the only definitions for the particular testcase.
Hmm, in every case it is GNU ld bug - the GNU ld internal ironly section should
not be leaking
to user warnings. Please fill in GNU ld PR.

Honza

[Bug testsuite/48055] FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48055

--- Comment #6 from Uros Bizjak <ubizjak at gmail dot com> 2011-03-10 14:39:57 UTC ---
(In reply to comment #5)
> > No, these are the only definitions for the particular testcase.
> Hmm, in every case it is GNU ld bug - the GNU ld internal ironly section should
> not be leaking
> to user warnings. Please fill in GNU ld PR.

Submitted as binutils PR 12564.

Anyway, should the patch be committed to gcc testsuite, since it doesn't change
the test and avoids the linker bug at the same time?

[1] http://sourceware.org/bugzilla/show_bug.cgi?id=12564

[Bug testsuite/48055] FAIL: gcc.c-torture/execute/builtins/memcpy-chk.c compilation, -O2 -flto

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48055

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #7 from Uros Bizjak <ubizjak at gmail dot com> 2011-03-10 16:51:35 UTC ---
Linker bug, see also [1].

[1] http://gcc.gnu.org/ml/gcc-patches/2011-03/msg00521.html