[Bug c/55651] New: gcc hangs when "-Wp," is passed on the command line

[Bug c/55651] New: gcc hangs when "-Wp," is passed on the command line

[steve.ulrich at broadcom dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55651

             Bug #: 55651
           Summary: gcc hangs when "-Wp," is passed on the command line
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: steve.ulrich@broadcom.com


If a user neglects to add the required parameter at the end of the "-Wp,"
prefix and just lists "-Wp," on the command line, gcc hangs.  To reproduce,
issue the following commands:

$ cp /dev/null testfile.c
$ gcc -Wp, -c testfile.c

This has been reproduced on a GCC cross compiler for PowerPC, and also for ARM,
so is believed to be reproducible regardless of the target CPU architecture.

"gcc -v" output:

Using built-in specs.
COLLECT_GCC=/projects/nwsoft-toolchains/brl/brl_2.1/brl_2.1.0/northstar/usr/bin/arm-broadcom-linux-uclibcgnueabi-gcc
COLLECT_LTO_WRAPPER=/projects/nwsoft-toolchains/brl/brl_2.1/brl_2.1.0/northstar/usr/libexec/gcc/arm-broadcom-linux-uclibcgnueabi/4.7.2/lto-wrapper
Target: arm-broadcom-linux-uclibcgnueabi
Configured with:
/projects/broadcom-linux/Northstar/tools/output/toolchain/gcc-4.7.2/configure
--prefix=/projects/nwsoft-toolchains/brl/brl_2.1/brl_2.1.0/northstar/usr
--build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
--target=arm-broadcom-linux-uclibcgnueabi --enable-languages=c,c++
--with-sysroot=/projects/nwsoft-toolchains/brl/brl_2.1/brl_2.1.0/northstar/usr/arm-broadcom-linux-uclibcgnueabi/sysroot
--with-build-time-tools=/projects/nwsoft-toolchains/brl/brl_2.1/brl_2.1.0/northstar/usr/arm-broadcom-linux-uclibcgnueabi/bin
--disable-__cxa_atexit --enable-target-optspace --disable-libgomp --with-gnu-ld
--disable-libssp --disable-multilib --enable-tls --enable-shared
--with-gmp=/projects/nwsoft-toolchains/brl/brl_2.1/brl_2.1.0/northstar/usr
--with-mpfr=/projects/nwsoft-toolchains/brl/brl_2.1/brl_2.1.0/northstar/usr
--with-mpc=/projects/nwsoft-toolchains/brl/brl_2.1/brl_2.1.0/northstar/usr
--disable-nls --enable-threads --disable-decimal-float --with-float=soft
--with-abi=aapcs-linux --with-arch=armv7-a --with-tune=cortex-a9
--with-pkgversion='Buildroot 2012.11-git-00621-gc13e2bc-dirty'
--with-bugurl=http://bugs.buildroot.net/ --with-pkgversion='Broadcom Linux
v2.1'
Thread model: posix
gcc version 4.7.2

[Bug driver/55651] gcc hangs when "-Wp," is passed on the command line

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55651

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-12-12
          Component|c                           |driver
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-12 10:07:21 UTC ---
It looks like cc1 treats

/usr/lib64/gcc/x86_64-suse-linux/4.6/cc1 -quiet -v "" t.c -quiet -dumpbase t.c
-mtune=generic -march=x86-64 -auxbase t -version -o /tmp/ccYYppXF.s

as reading from stdin?  Yes, it does,

gcc -Wp, -c t.c < /dev/null

works just fine.

Somewhat odd behavior though ;)  Confirmed.  The driver should either
drop empty -Wp, or error.

[Bug driver/55651] gcc hangs when "-Wp," is passed on the command line

[mingjie.xing at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55651

Mingjie Xing <mingjie.xing at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mingjie.xing at gmail dot com

--- Comment #2 from Mingjie Xing <mingjie.xing at gmail dot com> ---
Created attachment 31146
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31146&action=edit
This patch can fix the bug.

2013-11-04  Mingjie Xing  <mingjie.xing@gmail.com>

        * common.opt (Wa, Wl, Wp,): Change JoinedOrMissing to Joined.

[Bug driver/55651] gcc hangs when "-Wp," is passed on the command line

[joseph at codesourcery dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55651

--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Mon, 4 Nov 2013, mingjie.xing at gmail dot com wrote:

> 2013-11-04  Mingjie Xing  <mingjie.xing@gmail.com>
> 
>         * common.opt (Wa, Wl, Wp,): Change JoinedOrMissing to Joined.

That sounds wrong.  Empty arguments are valid here and should be passed 
down as such.  See the thread starting at 
<http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00848.html> where a change 
to the handling of empty arguments was rejected.

[Bug driver/55651] gcc hangs when "-Wp," is passed on the command line

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55651

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
As reported this is correct behavior.