testcase.cpp: internal compiler error: Segmentation fault.

[Sjors Gielen]

I'm using qt4-x11 version 4.4.3-0ubuntu1.2 from intrepid-proposed. I was trying to compile KMess when I noticed an internal compiler error on using QMaps. I read in the gcc FAQ that these are usually because of errors in any of the code it is trying to compile or link, therefore I am reporting here. Please tell me if I should bugreport against gcc instead.

I wrote a test case which I have attached. The gcc-testcase.pro file was simply generated by qmake -project. Compiling this project gives the following output:

$ make
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -I. -o testcase.o testcase.cpp
testcase.cpp:6: warning: unused parameter 'argc'
testcase.cpp:6: warning: unused parameter 'argv'
testcase.cpp: In member function 'bool QBasicAtomicInt::operator!=(int) const':
testcase.cpp:18: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.3/README.Bugs> for instructions.
make: *** [testcase.o] Error 1

FWIW, this is the version table and policy of some of my packages:
ii libqtcore4 4.4.3-0ubuntu1.2 Qt 4 core module
ii gcc-4.3 4.3.2-1ubuntu12 The GNU C compiler
ii binutils 2.18.93.20081009-0ubuntu1 The GNU assembler, linker and binary utilities
libqtcore4:
  Installed: 4.4.3-0ubuntu1.2
  Candidate: 4.4.3-0ubuntu1.2
  Version table:
 *** 4.4.3-0ubuntu1.2 0
        500 http://ftp.tiscali.nl intrepid-proposed/main Packages
        100 /var/lib/dpkg/status
     4.4.3-0ubuntu1.1 0
        500 http://ftp.tiscali.nl intrepid-updates/main Packages
     4.4.3-0ubuntu1 0
        500 http://ftp.tiscali.nl intrepid/main Packages
gcc-4.3:
  Installed: 4.3.2-1ubuntu12
  Candidate: 4.3.2-1ubuntu12
  Version table:
 *** 4.3.2-1ubuntu12 0
        500 http://ftp.tiscali.nl intrepid-updates/main Packages
        100 /var/lib/dpkg/status
     4.3.2-1ubuntu11 0
        500 http://ftp.tiscali.nl intrepid/main Packages
binutils:
  Installed: 2.18.93.20081009-0ubuntu1
  Candidate: 2.18.93.20081009-0ubuntu1
  Version table:
 *** 2.18.93.20081009-0ubuntu1 0
        500 http://ftp.tiscali.nl intrepid/main Packages
        100 /var/lib/dpkg/status

Also:
lrwxrwxrwx 1 root root 7 Nov 8 22:13 /usr/bin/gcc -> gcc-4.3

[Jonathan Thomas (echidnaman)]

Seems to work with Qt 4.5.1 and GCC 4.4:
(I did have to add #include <iostream.h> before it'd compile, but it didn't segfault there either)

jonathan@jonathan-desktop:~/Documents/sauce/testcase$ make
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -o testcase.o testcase.cpp
testcase.cpp:7: warning: unused parameter ‘argc’
testcase.cpp:7: warning: unused parameter ‘argv’
/usr/include/qt4/QtCore/qmap.h: In function ‘int main(int, char**)’:
/usr/include/qt4/QtCore/qmap.h:704: warning: dereferencing pointer ‘pretmp.136’ does break strict-aliasing rules
cc1plus: note: initialized from here
g++ -Wl,-O1 -o testcase\ testcase testcase.o -L/usr/lib -lQtGui -lQtCore -lpthread
jonathan@jonathan-desktop:~/Documents/sauce/testcase$