Summary: Probable mmap() bug that breaks cpp-3.2
Product: Linux XFS
Component: XFS kernel code
If this is a userspace bug, what version of the package are you using:
The problem occurs in the user space, but I am not certain where it comes from
(it's not a crash)
What kernel are you using:
orion:qmake$ uname -a
Linux orion 2.4.20-xfs #4 Sun Feb 9 18:07:50 EET 2003 i686 unknown
Where did the XFS code come from? (CVS, Linus, your distribution, etc):
I'm using CVS HEAD from SGI.
Description of Problem:
Problem is that cpp-3.2 will malfunct when using XFS. It has been suggested
that there might be a problem with mmap() in XFS, not properly null-padding
mmap() and that might indeed be the case....
Here is a typical manifestation of the problem:
/home-aux/exa/code/kde/qt-copy/include/qcstring.h:394: parse error before `/'
In that source code 394 is the last line and there is no such character as '/'
So if I inspect closely and run just the preprocessor:
g++-3.2 -E ....
g++-3.2: Internal error: Segmentation fault (program cpp0)
Please submit a full bug report
Now, it might seem that this is a GCC bug, but that isn't the case. When I try
to compile the same code on tmpfs or ext2 everything works fine.
You will hate me for this :)
It's very reproducible but it might be hard for you to find a test system.
The bug pertains to version 2:2.95.4-17 of gcc packages in debian (other
versions might not manifest this bug)
I have been able to spot the problem only in compilation of Qt from qt-copy in
KDE CVS. I think trying to compile Qt 3.1 will be a good start.
I've tried other sources I have to reproduce the bug in a minimal setting but so
far I have failed. If I can find an easier test case I will send the details.
Of course, I would like to hear from you what else I can do to locate the bug or
reproduce it in alternative ways.
Here is my qt configuration if needed:
export YACC='byacc -d'
make -f Makefile.cvs
./configure -system-zlib -qt-gif -system-libpng -system-libjpeg \
-plugin-imgfmt-mng -thread -no-stl -no-xinerama -no-g++-exceptions \
-fast -platform linux-g++-i686
Here linux-g++-i686 is standard g++ configuration with some optimization flags
and using g++-3.2....
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