[Bug c/55383] New: -Wcast-qual reports incorrect message

[Bug c/55383] New: -Wcast-qual reports incorrect message

[gcc.hall at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

             Bug #: 55383
           Summary: -Wcast-qual reports incorrect message
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gcc.hall@gmail.com


------------------------------------------------------
#include <string.h>
int
main( int argc, char *argv[] )
{
  volatile double val;
  memset( (void*)&val, 0, sizeof(double) );
}
---------------------------------------------------------

 gcc -Wcast-qual bug.c
bug.c: In function 'main':
bug.c:7:11: warning: cast discards '__attribute__((noreturn))' qualifier from
pointer target type [-Wcast-qual]

~/j/ge* gcc -v               
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.7.2/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla
--enable-bootstrap --enable-shared --enable-threads=posix
--enable-checking=release --disable-build-with-cxx
--disable-build-poststage1-with-cxx --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id --with-linker-hash-style=gnu
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin
--enable-initfini-array --enable-java-awt=gtk --disable-dssi
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib
--with-ppl --with-cloog --with-tune=generic --with-arch_32=i686
--build=x86_64-redhat-linux
Thread model: posix
gcc version 4.7.2 20120921 (Red Hat 4.7.2-2) (GCC)

[Bug c/55383] -Wcast-qual reports incorrect message

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-11-18
                 CC|                            |manu at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-11-18 21:15:09 UTC ---
Confirmed. The warning call is wrong:

c/c-typeck.c-4468-    /* There are qualifiers present in IN_OTYPE that are not
present
c/c-typeck.c-4469-       in IN_TYPE.  */
c/c-typeck.c-4470-    warning_at (loc, OPT_Wcast_qual,
c/c-typeck.c:4471:              "cast discards %q#v qualifier from pointer
target type",
c/c-typeck.c-4472-              discarded);
c/c-typeck.c-4473-
c/c-typeck.c-4474-  if (added || discarded)

It should use %qv for non-function types. Patch:


Index: c/c-typeck.c
===================================================================
--- c/c-typeck.c        (revision 192847)
+++ c/c-typeck.c        (working copy)
@@ -4466,11 +4466,11 @@ handle_warn_cast_qual (location_t loc, t

   if (discarded)
     /* There are qualifiers present in IN_OTYPE that are not present
        in IN_TYPE.  */
     warning_at (loc, OPT_Wcast_qual,
-               "cast discards %q#v qualifier from pointer target type",
+               "cast discards %qv qualifier from pointer target type",
                discarded);

   if (added || discarded)
     return;

Index: testsuite/c-c++-common/Wcast-qual-1.c
===================================================================
--- testsuite/c-c++-common/Wcast-qual-1.c       (revision 192847)
+++ testsuite/c-c++-common/Wcast-qual-1.c       (working copy)
@@ -83,15 +83,15 @@ f3 (void ***bar)
 }

 void
 f4 (void * const **bar)
 {
-  const void ***p9 = (const void ***) bar; /* { dg-warning "cast" } */
+  const void ***p9 = (const void ***) bar; /* { dg-warning "cast discards
.const. qualifier" } */
   void * const **p11 = (void * const **) bar;
-  void ** const *p13 = (void ** const *) bar; /* { dg-warning "cast" } */
+  void ** const *p13 = (void ** const *) bar; /* { dg-warning "cast discards
.const. qualifier" } */
   const void * const **p15 = (const void * const **) bar; /* { dg-warning
"cast" } */
-  const void ** const *p17 = (const void ** const *) bar; /* { dg-warning
"cast" } */
+  const void ** const *p17 = (const void ** const *) bar; /* { dg-warning
"cast discards .const. qualifier" } */
   void * const * const * p19 = (void * const * const *) bar;
   const void * const * const *p21 = (const void * const * const *) bar;
 }

[Bug c/55383] -Wcast-qual reports incorrect message

[gerald at pfeifer dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #2 from Gerald Pfeifer <gerald at pfeifer dot com> ---
Hi Manuel, I also got pinged by a FreeBSD user of one of my ports
about this.

Somehow I cannot find your patch submission on gcc-patches -- is it
possible you haven't submitted it there yet?  Will you be doing that,
or is it fine if I do?

[Bug c/55383] -Wcast-qual reports incorrect message

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Gerald Pfeifer from comment #2)
> Somehow I cannot find your patch submission on gcc-patches -- is it
> possible you haven't submitted it there yet?  Will you be doing that,
> or is it fine if I do?

I don't remember what happened with this patch. Please feel free to adopt it if
it works. Thanks for taking care of it.
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Subject: [Bug rtl-optimization/57468] [4.9 Regression] 26% performance drop on important benchmark after r199298.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idW468

--- Comment #4 from Igor Zamyatin <izamyatin at gmail dot com> ---
So following commit fixed the issue

commit 3620f4de1b49b0bfffe5f812b2d259e5c72c5c61
Author: vmakarov <vmakarov@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Jun 6 21:12:06 2013 +0000

    2013-06-06  Vladimir Makarov  <vmakarov@redhat.com>

        PR rtl-optimization/57468
        * config/i386/i386.c (inline_secondary_memory_needed): Ignore
        spilled pseudos.



    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@199764
138bc75d-0d04-0410-961f-82ee72b054a4

[Bug c/55383] -Wcast-qual reports incorrect message

[magnus.reftel at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

Magnus Reftel <magnus.reftel at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |magnus.reftel at gmail dot com

--- Comment #4 from Magnus Reftel <magnus.reftel at gmail dot com> ---
Also affects 4.6, 4.8 and trunk as of version
96c7d4b1727c5f9ddcbb02fb69f727a0f2f3572e. 4.4 correctly prints just "error:
cast discards qualifiers from pointer target type". Did not check with version
4.5.

Since 4.4 had it right, does this count as a 4.6/4.7/4.8/4.9 regression?

[Bug c/55383] -Wcast-qual reports incorrect message

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #5 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Magnus Reftel from comment #4)
> Also affects 4.6, 4.8 and trunk as of version
> 96c7d4b1727c5f9ddcbb02fb69f727a0f2f3572e. 4.4 correctly prints just "error:
> cast discards qualifiers from pointer target type". Did not check with
> version 4.5.
> 
> Since 4.4 had it right, does this count as a 4.6/4.7/4.8/4.9 regression?

This just needs someone willing to test the patch in comment #1 and submit it.
It is such a trivial patch that I cannot claim any authorship, so please adopt
it and get it fixed. If you are fast enough, you may be able to sneak it in GCC
4.9. (The time it took you to do all those tests would have been better spent
fixing the bug.)
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Subject: [Bug c/55383] -Wcast-qual reports incorrect message
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idU383

--- Comment #6 from Magnus Reftel <magnus.reftel at gmail dot com> ---
Sorry, I'm not a GCC developer - just another user aflicted by the bug.

[Bug c/55383] -Wcast-qual reports incorrect message

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch

--- Comment #7 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Magnus Reftel from comment #6)
> Sorry, I'm not a GCC developer - just another user aflicted by the bug.

Everybody can be a GCC developer. You don't need special powers, just some free
time and willing to be. For such a small patch, you don't need any copyright
assignment. Just check out svn trunk, set up a bootstrap, test without the
patch, apply the patch, bootstrap and test with the patch and compare the
results. (Check the gccfarming script here:
http://gcc.gnu.org/wiki/ManuelL%C3%B3pezIb%C3%A1%C3%B1ez for all the details).

If the patch does not produce any new FAILs in the testsuite, submit to
gcc-patches with a changelog and ask the reviewer to commit it once accepted.

(You don't even need a powerful computer to do all this, just get an account on
the compile farm: http://gcc.gnu.org/wiki/CompileFarm )
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`429

--- Comment #19 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Yes, looks like the reduced testcase is invalid and contains a few
buffer overflows.

[Bug c/55383] -Wcast-qual reports incorrect message

[gerald at pfeifer dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

Gerald Pfeifer <gerald at pfeifer dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #8 from Gerald Pfeifer <gerald at pfeifer dot com> ---
I'll see what I can do.

[Bug c/55383] -Wcast-qual reports incorrect message

[magnus.reftel at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #9 from Magnus Reftel <magnus.reftel at gmail dot com> ---
Created attachment 32331
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32331&action=edit
Patch from comment #1, updated to apply on trunk

[Bug c/55383] -Wcast-qual reports incorrect message

[magnus.reftel at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #10 from Magnus Reftel <magnus.reftel at gmail dot com> ---
Applied Manuel López-Ibáñez's patch on top of trunk and tested Jeremy's
testcase. Without the patch, the error message says that
"__attribute__((noreturn))" is being cast away. With the patch, the error
message says that "volatile" is being cast away. Running "make check" to see if
there were any regressions.
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Subject: [Bug libstdc++/60497] unique_ptr<T> tries to complete its type T even though it's not required to be a complete type
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`497

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-03-11
          Component|c++                         |libstdc++
     Ever confirmed|0                           |1

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Whether it is required or not, qualifying the call to __get_helper is easy
enough (it may even be slightly faster to compile), it seems worth doing.

Now the question would be: are there similar statements throughout the library
that could benefit from the same treatment, or is this a special case?

Thanks for the detailed analysis.

[Bug c/55383] -Wcast-qual reports incorrect message

[magnus.reftel at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #11 from Magnus Reftel <magnus.reftel at gmail dot com> ---
No regressions seen. Sent en email with the patch to gcc-patches as requested (
http://gcc.gnu.org/ml/gcc-patches/2014-03/msg00517.html ).

[Bug c/55383] -Wcast-qual reports incorrect message

[magnus.reftel at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #12 from Magnus Reftel <magnus.reftel at gmail dot com> ---
Any suggestions on how to progress with this one?

[Bug c/55383] -Wcast-qual reports incorrect message

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #13 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Magnus Reftel from comment #12)
> Any suggestions on how to progress with this one?

Looking at the testcases modified by the patch, I don't know why there is no
test for volatile (which is what triggers this bug). I will take a look at the
output of the testsuite this weekend. It is probable that there is a testcase
for this, but the test matching text is not precise enough. Once I check this,
I will commit the patch since it was approved by Joseph here:

http://gcc.gnu.org/ml/gcc-patches/2014-03/msg00532.html
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`459

Raghu <raghupv30 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical

[Bug c/55383] -Wcast-qual reports incorrect message

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #14 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Author: manu
Date: Tue Mar 18 19:58:39 2014
New Revision: 208661

URL: http://gcc.gnu.org/viewcvs?rev=208661&root=gcc&view=rev
Log:
2014-03-18  Manuel López-Ibáñez  <manu@gcc.gnu.org>

    PR c/55383
c/
    * c-typeck.c: Use correct format string in cast-qual warning
testsuite/
    * c-c++-common/Wcast-qual-1.c: More precise match text.

Modified:
    trunk/gcc/c/ChangeLog
    trunk/gcc/c/c-typeck.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/c-c++-common/Wcast-qual-1.c
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Subject: [Bug target/60562] [4.9 Regression] FAIL: gcc.target/i386/excess-precision-3.c execution test after r208587
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`562

--- Comment #5 from Richard Henderson <rth at gcc dot gnu.org> ---
Author: rth
Date: Tue Mar 18 19:59:54 2014
New Revision: 208662

URL: http://gcc.gnu.org/viewcvs?rev 8662&root=gcc&view=rev
Log:
PR target/60562

        * config/i386/i386.md (*float<SWI48x><MODEF>2_i387): Move down to
        be shadowed by *float<SWI48><MODEF>2_sse.  Test X87_ENABLE_FLOAT.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md

[Bug c/55383] -Wcast-qual reports incorrect message

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

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

--- Comment #15 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Of course, the bug affects all qualifiers, not just volatile, so the updated
testcase would be enough to catch this in case we regress. So I went ahead and
committed the patch. This will be fixed in GCC 4.9. For earlier versions,
you'll have to ask Jakub or Joseph in the mailing list about backporting the
patch, since it is not technically a regression but it is a trivial fix. Unless
someone steps up to take care of backporting, I'd consider this FIXED.

Thanks Magnus for following up on this. I know some other bugs with patches in
case you are interested (and plenty of trivial bugs without a patch!).
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Subject: [Bug rtl-optimization/56356] [4.7/4.8/4.9 Regression] DJGPP compiler crashing
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idV356

--- Comment #6 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Author: ktietz
Date: Tue Mar 18 20:06:37 2014
New Revision: 208664

URL: http://gcc.gnu.org/viewcvs?rev 8664&root=gcc&view=rev
Log:
    PR rtl-optimization/56356
    * sdbout.c (sdbout_parms): Verify that parms'
    incoming argument is valid.
    (sdbout_reg_parms): Likewise.


Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/sdbout.c

[Bug c/55383] -Wcast-qual reports incorrect message

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #16 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
It seems the patch was not tested in C++:

Tests that now fail, but worked before:

unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++11  (test for warnings, line
88)
unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++11  (test for warnings, line
92)
unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++11 (test for excess errors)
unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++1y  (test for warnings, line
88)
unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++1y  (test for warnings, line
92)
unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++1y (test for excess errors)
unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++98  (test for warnings, line
88)
unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++98  (test for warnings, line
92)
unix//-m32: c-c++-common/Wcast-qual-1.c -std=gnu++98 (test for excess errors)
unix//-m64: c-c++-common/Wcast-qual-1.c -std=gnu++11  (test for warnings, line
88)
unix//-m64: c-c++-common/Wcast-qual-1.c -std=gnu++11  (test for warnings, line
92)
unix//-m64: c-c++-common/Wcast-qual-1.c -std=gnu++11 (test for excess errors)
unix//-m64: c-c++-common/Wcast-qual-1.c -std=gnu++1y  (test for warnings, line
88)
unix//-m64: c-c++-common/Wcast-qual-1.c -std=gnu++1y  (test for warnings, line
92)
unix//-m64: c-c++-common/Wcast-qual-1.c -std=gnu++1y (test for excess errors)
unix//-m64: c-c++-common/Wcast-qual-1.c -std=gnu++98  (test for warnings, line
88)
unix//-m64: c-c++-common/Wcast-qual-1.c -std=gnu++98  (test for warnings, line
92)

I guess my patch should have not touched an already existing testcase but
instead add a new one for C only.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #17 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Author: manu
Date: Tue Mar 18 23:22:02 2014
New Revision: 208669

URL: http://gcc.gnu.org/viewcvs?rev=208669&root=gcc&view=rev
Log:
2014-03-19  Manuel López-Ibáñez  <manu@gcc.gnu.org>

    PR c/55383
    * gcc.dg/cast-qual-3.c: New.
    Revert:
    2014-03-18  Manuel López-Ibáñez  <manu@gcc.gnu.org>
    * c-c++-common/Wcast-qual-1.c: More precise match text.

Added:
    trunk/gcc/testsuite/gcc.dg/cast-qual-3.c
Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/c-c++-common/Wcast-qual-1.c
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Adam Butcher <abutcher at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-03-19
           Assignee|unassigned at gcc dot gnu.org      |abutcher at gcc dot gnu.org
   Target Milestone|---                         |4.9.0
     Ever confirmed|0                           |1