RE: preprocessor/6084: cpp Segmentation Fault

["Gerwin, Joshua A" <joshua dot a dot gerwin at intel dot com>]

The following reply was made to PR preprocessor/6084; it has been noted by GNATS.

From: "Gerwin, Joshua A" <joshua.a.gerwin@intel.com>
To: "'neil@gcc.gnu.org'" <neil@gcc.gnu.org>,
   "'gcc-bugs@gcc.gnu.org'"<gcc-bugs@gcc.gnu.org>,
   "'gcc-prs@gcc.gnu.org'" <gcc-prs@gcc.gnu.org>,
   "'joshg@hf.intel.com'" <joshg@hf.intel.com>,
   "'nobody@gcc.gnu.org'"<nobody@gcc.gnu.org>,
   "'rnesius@ichips.intel.com'"<rnesius@ichips.intel.com>,
   "Nguyen, Tuan" <tuan.nguyen@intel.com>,
   "'gcc-gnats@gcc.gnu.org'" <gcc-gnats@gcc.gnu.org>
Cc:  
Subject: RE: preprocessor/6084: cpp Segmentation Fault
Date: Fri, 29 Mar 2002 11:35:17 -0800

 > -----Original Message-----
 > From: neil@gcc.gnu.org [mailto:neil@gcc.gnu.org]
 > Sent: Friday, March 29, 2002 12:20 AM
 > To: gcc-bugs@gcc.gnu.org; gcc-prs@gcc.gnu.org; joshg@hf.intel.com;
 > nobody@gcc.gnu.org; rnesius@ichips.intel.com; tuan.nguyen@intel.com
 > Subject: Re: preprocessor/6084: cpp Segmentation Fault
 > 
 > 
 > Synopsis: cpp Segmentation Fault
 > 
 > State-Changed-From-To: open->feedback
 > State-Changed-By: neil
 > State-Changed-When: Fri Mar 29 00:20:22 2002
 > State-Changed-Why:
 >     Changed to category preprocessor; not a front end issue.
 >     
 >     Quite a surpise to me, too.  I take pride in cpp not 
 > segfaulting 8-)
 >     
 >     Could you give me a testcase?  I can't reproduce it with
 >     the information supplied.
 >     Or, could you try 3.0.4?  There was a segfault fixed in the
 >     later 3.0 cycle, triggered by a combination of command
 >     line options, but I'm not sure which 3.0.x got it.
 >     Judging by your command line, I suspect it is caused by
 >     a certain combination of switches; can you reproduce it
 >     on a simple file like #include <stdio.h> or something?
 >     
 >     Alternatively, if you can't produce a simple testcase, 
 > but can get it to happen on Linux, then please send me the 
 > files so I can track this down, or tell me where it happens 
 > when you're debugging the cpp0 binary.
 >     
 >     Thanks!
 > 
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&;
 database=gcc&pr=6084
 
 Sorry about the category thing, I didn't notice a preprocessor category on
 the submit form.  
 
 The first sighting of the cpp segfault was in a troublesome build of op.c in
 the vanilla perl 5.6.1 distribution from CPAN.  However, you need not go
 there.  Using the same command line options, I can get it to segfault
 without any source at all, simply by using ^D for stdin.  Since an empty
 file may be aesthetically unsatisfying, I submit the following:
 
 $ cat ../../../../accessories/hello.c 
 #include <stdio.h>
 #ifdef MATHTEST
 #include <math.h>
 #endif
 
 main() {
 float X;
 printf("Hello, World! \n");
 #ifdef MATHTEST
 X = sqrt(4);
 printf("the sqrt of 4 is %f \n", X);
 #endif
 }
 
 $ /(path/to)/gcc/3.0.3-64/bin/cpp -DPERL_CORE -fno-strict-aliasing
 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -mcpu=v9 -m64 -Wa,-xarch=v9 -O3
 -m64 -dM -dD -dI -v ../../../../accessories/hello.c
 Reading specs from
 /(path/to)/gcc/3.0.3-64/lib/gcc-lib/sparcv9-sun-solaris2/3.0.3/specs
 Configured with: ../gcc-3.0.3/configure --host=sparcv9-sun-solaris2
 --prefix=
 /(path/to)/gcc/3.0.3-64 --with-as=/usr/ccs/bin/as
 --with-nm=/(path/to)/gcc/3.0.3-64/bin/nm --with-ld=/usr/ccs/bin/ld
 Thread model: posix
 gcc version 3.0.3
  /(path/to)/gcc/3.0.3-64/lib/gcc-lib/sparcv9-sun-solaris2/3.0.3/cpp0 -lang-c
 -v -Dsparc -Dsun -Dunix -D__svr4__ -D__SVR4 -D__sparc__ -D__sun__ -D__unix__
 -D__svr4__ -D__SVR4 -D__sparc -D__sun -D__unix -Asystem=unix -Asystem=svr4
 -D__OPTIMIZE__ -D__STDC_HOSTED__=1 -dM -dD -dI -D__SIZE_TYPE__=long unsigned
 int -D__PTRDIFF_TYPE__=long int -D__WCHAR_TYPE__=int -D__WINT_TYPE__=int
 -D__arch64__ -Acpu=sparc64 -Amachine=sparcv9 -D__sparcv9 -DPERL_CORE
 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 ../../../../accessories/hello.c
 GNU CPP version 3.0.3 (cpplib) (sparc)
 ignoring nonexistent directory
 "/(path/to)/gcc/3.0.3-64/sparcv9-sun-solaris2/include"
 #include "..." search starts here:
 #include <...> search starts here:
  /usr/local/include
  /(path/to)/gcc/3.0.3-64/lib/gcc-lib/sparcv9-sun-solaris2/3.0.3/include
  /usr/include
 End of search list.
 cpp: Internal error: Segmentation Fault (program cpp0)
 Please submit a full bug report.
 See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
 
 A minor experiment in option removal shows that the problem is potentially
 tied to the 
 -dD tag.  Compare:
 
 $ /(path/to)/gcc/3.0.3-64/bin/cpp -mcpu=v9 -m64 -Wa,-xarch=v9 -O3 -m64 -dM
 -dD ../../../../accessories/hello.c
 cpp: Internal error: Segmentation Fault (program cpp0)
 Please submit a full bug report.
 See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
 
 $ /usr/intel/pkgs/gcc/3.0.3-64/bin/cpp -mcpu=v9 -m64 -Wa,-xarch=v9 -O3 -m64
 -dM ../../../../accessories/hello.c
 #define __USER_LABEL_PREFIX__
 #define _LONG_LONG_HTOL
 #define __SIZE_TYPE__ long unsigned int
 #define _LONG_ALIGNMENT 8
 #define _LONG_DOUBLE_ALIGNMENT 16
 #define P_tmpdir "/var/tmp/"
 #define _SSIZE_T
 #define __arch64__ 1
 #define __PTRDIFF_TYPE__ long int
 #define _FILE_OFFSET_BITS 64
 #define _ALIGNMENT_REQUIRED 1
 #define __HAVE_BUILTIN_SETJMP__ 1
 #define _SHORT_ALIGNMENT 2
 #define SEEK_SET 0
 #define _DOUBLE_ALIGNMENT 8
 #define freopen64 freopen
 #define putchar(x) putc((x), stdout)
 #define ftello64 ftello
 #define _NO_FDISK_PRESENT
 #define _BIT_FIELDS_HTOL
 #define _LONG_LONG_ALIGNMENT 8
 etcetera etcetera etcetera
 
 A clue, no?
 
 Josh Gerwin, System Programmer/Analyst
 joshua.a.gerwin@intel.com
 Intel Corp.
 NorthWest Engineering Computing