[Bug testsuite/29240] New: [gcc 4.8] FAIL: gdb.base/align-c.exp: print _Alignof(long long)

[Bug testsuite/29240] New: [gcc 4.8] FAIL: gdb.base/align-c.exp: print _Alignof(long long)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29240

            Bug ID: 29240
           Summary: [gcc 4.8] FAIL: gdb.base/align-c.exp: print
                    _Alignof(long long)
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

With gcc 4.8 and target board unix/-m32, I run into:
...
FAIL: gdb.base/align-c.exp: print _Alignof(long long)
FAIL: gdb.base/align-c.exp: print _Alignof(unsigned long long)
FAIL: gdb.base/align-c.exp: print _Alignof(double)
...

First FAIL in more detail:
...
(gdb) align_pair_unsigned_long_x_long_double)
print /d a_long_long^M
$225 = 8^M
(gdb) PASS: gdb.base/align-c.exp: get integer valueof "a_long_long"
print _Alignof(long long)^M
$226 = 4^M
(gdb) FAIL: gdb.base/align-c.exp: print _Alignof(long long)
...

This looks like https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69560 , which was
fixed in gcc 8.1.0.  Curious that I don't run into it with system gcc 7.5.0,
but perhaps it was backported in the package.

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[Bug testsuite/29240] [gcc 4.8, m32] FAIL: gdb.base/align-c.exp: print _Alignof(long long)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29240

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[gcc 4.8] FAIL:             |[gcc 4.8, m32] FAIL:
                   |gdb.base/align-c.exp: print |gdb.base/align-c.exp: print
                   |_Alignof(long long)         |_Alignof(long long)

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[Bug testsuite/29240] [gcc 4.8, m32] FAIL: gdb.base/align-c.exp: print _Alignof(long long)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29240

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> This looks like https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69560 , which
> was fixed in gcc 8.1.0.  Curious that I don't run into it with system gcc
> 7.5.0, but perhaps it was backported in the package.

A standalone reproducer:
...
$ cat align.c
#include <stdio.h>

unsigned a_long_long
  = _Alignof (long long);

int
main ()
{
  printf ("%d\n", a_long_long);
  return 0;
}
...

Fails with gcc 4.8 (prints 8):
...
$ gcc-4.8 align.c -m32 && ./a.out
8
...

Passes with system gcc 7.5.0 (prints 4):
...
$ gcc align.c -m32 && ./a.out
4
...


Also passes (prints 4) with a regular gcc 7.5.0 build:
...
$ ./install/bin/gcc /home/vries/gdb_versions/devel/align.c -m32
$ ./a.out 
4
....
so this is not related to the package.

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[Bug testsuite/29240] [gcc 4.8, m32] FAIL: gdb.base/align-c.exp: print _Alignof(long long)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29240

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
This is probably https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023 , which was
fixed in gcc 4.9.0

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