Mailinglist Archive: opensuse-bugs (3328 mails)

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https://bugzilla.novell.com/show_bug.cgi?id=697719

https://bugzilla.novell.com/show_bug.cgi?id=697719#c0


           Summary: g++ -ftemplate-depth=4496 segfaults.  4495 ok.
    Classification: openSUSE
           Product: openSUSE 11.3
           Version: Final
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Development
        AssignedTo: pth@xxxxxxxxxx
        ReportedBy: malcolm.douglas@xxxxxxxxx
         QAContact: qa@xxxxxxx
          Found By: ---
           Blocker: ---


Created an attachment (id=432692)
 --> (http://bugzilla.novell.com/attachment.cgi?id=432692)
C++ source file that causes g++ to bug out.

User-Agent:       Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML,
like Gecko) Chrome/11.0.696.68 Safari/534.24

When compiling attachment with the command:

g++ -ftemplate-depth=4496 -o submission submission.cc

I get a segfault.  Doesn't segfault with -ftemplate-depth=4495, in that case I
get an error saying I'm above the recursive depth for templates, and that I
need to increase it.  On my system I guess this is the breaking point.  




Reproducible: Always

Steps to Reproduce:
1.try to compile the attached source code with the command source code.  The
command I used is:

g++ -ftemplate-depth=4496 -o submission submission.cc

2.If it doesn't seg fault on your system, maybe try to increase the
-ftemplate-depth and add a bigger integer to check the primeness of in the
source code in the main function.

My system is:
gcc -v :
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib64/gcc/x86_64-suse-linux/4.5/lto-wrapper
Target: x86_64-suse-linux
Configured with: ../configure --prefix=/usr --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64
--enable-languages=c,c++,objc,fortran,obj-c++,java,ada
--enable-checking=release --with-gxx-include-dir=/usr/include/c++/4.5
--enable-ssp --disable-libssp --disable-plugin
--with-bugurl=http://bugs.opensuse.org/ --with-pkgversion='SUSE Linux'
--disable-libgcj --disable-libmudflap --with-slibdir=/lib64 --with-system-zlib
--enable-__cxa_atexit --enable-libstdcxx-allocator=new --disable-libstdcxx-pch
--enable-version-specific-runtime-libs --program-suffix=-4.5
--enable-linux-futex --without-system-libunwind --enable-gold
--with-plugin-ld=/usr/bin/gold --with-arch-32=i586 --with-tune=generic
--build=x86_64-suse-linux
Thread model: posix
gcc version 4.5.0 20100604 [gcc-4_5-branch revision 160292] (SUSE Linux) 

uname -a:
Linux linux-o9py 2.6.34.7-0.7-desktop #1 SMP PREEMPT 2010-12-13 11:13:53 +0100
x86_64 x86_64 x86_64 GNU/Linux

3.
Actual Results:  
g++ -ftemplate-depth=4496 -o submission submission.cc
g++: Internal error: Segmentation fault (program cc1plus)
Please submit a full bug report.
See <http://bugs.opensuse.org/> for instructions.

Compilation exited abnormally with code 1 at Thu Jun  2 11:11:04

Expected Results:  
Segfaults!  Eep!  Might be upstream though, don't have an upstream gcc to try
it on.

I don't really care about this at present because I was just experimenting with
template meta-programming.  That being said, in my case it was pretty easy to
determine the cause of the segfault, which I suppose isn't always true. Since
this can be caused by an increased constant in a parameter of the template, and
sometimes template stuff gets buried by typedefs and inheritance, this might be
hard to pinpoint in a larger project.  And the error message said to report the
bug, so I figured I would do so.  But as far as I'm concerned it's not
important.  I will respond to follow up correspondence if I can help, however.

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