[Bug c/35992] New: Linux kernel code fails to compile with -Os

[Bug c/35992] New: Linux kernel code fails to compile with -Os

[dcb314 at hotmail dot com]

I just tried to compile the new Linux kernel 2.6.25
with the new GNU C compiler version 4.4 snapshot 20080418

The GNU C compiler said

drivers/char/cyclades.c: In function 'cyz_load_fw':
drivers/char/cyclades.c:5421: error: invalid use of void expression
drivers/char/cyclades.c:5421: error: invalid use of void expression
drivers/char/cyclades.c:5421: error: invalid use of void expression
drivers/char/cyclades.c:5421: error: invalid use of void expression

Preprocessed source code attached. Flag -Os required


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           Summary: Linux kernel code fails to compile with -Os
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dcb314 at hotmail dot com
  GCC host triplet: suse-linux-x86_64


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992

[Bug c/35992] Linux kernel code fails to compile with -Os

[dcb314 at hotmail dot com]

------- Comment #1 from dcb314 at hotmail dot com  2008-04-20 19:46 -------
Created an attachment (id=15501)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15501&action=view)
C source code


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992

[Bug middle-end/35992] [4.4 Regression] Linux kernel code fails to compile with -Os

[pinskia at gcc dot gnu dot org]

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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ian at gcc dot gnu dot org
           Severity|normal                      |blocker
          Component|c                           |middle-end
           Keywords|                            |rejects-valid
            Summary|Linux kernel code fails to  |[4.4 Regression] Linux
                   |compile with -Os            |kernel code fails to compile
                   |                            |with -Os
   Target Milestone|---                         |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992

[Bug middle-end/35992] [4.4 Regression] Linux kernel code fails to compile with -Os

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2008-04-20 19:50 -------
Caused by:
  size = size_in_bytes (TREE_TYPE (TREE_TYPE (base)));
  if (size == NULL_TREE || TREE_CODE (size) != INTEGER_CST)
    return true;

in pointer_may_wrap_p.

a simple s/size_in_bytes/TYPE_SIZE_UNIT/ should fix the problem.


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-04-20 19:50:29
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992

[Bug middle-end/35992] [4.4 Regression] Linux kernel code fails to compile with -Os

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-04-20 20:34 -------
Isn't pointer_may_wrap_p just get_ref_base_and_extent () and checking for
max_size != -1?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992

[Bug middle-end/35992] [4.4 Regression] Linux kernel code fails to compile with -Os

[rguenth at gcc dot gnu dot org]

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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992

[Bug middle-end/35992] [4.4 Regression] Linux kernel code fails to compile with -Os

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2008-04-21 09:27 -------
Btw, glibc build fails the same way.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992

[Bug middle-end/35992] [4.4 Regression] Linux kernel code fails to compile with -Os

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2008-04-22 08:58 -------
*** Bug 36005 has been marked as a duplicate of this bug. ***


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marcus at jet dot franken
                   |                            |dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992

[Bug middle-end/35992] [4.4 Regression] Linux kernel code fails to compile with -Os

[ian at airs dot com]

------- Comment #6 from ian at airs dot com  2008-04-23 22:46 -------
This is fixed by this patch:

2008-04-22  Ian Lance Taylor  <iant@google.com>

        * fold-const.c (pointer_may_wrap_p): Call int_size_in_bytes rather
        than size_in_bytes.

Sorry about the difficulties.


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ian at airs dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35992