Re: problem with iostream

["Martin Berger" <martin.berger@orange.net>]

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> > hello, i have just upgraded to the latest 
version of redhat linux > > and suddenly my g++ compiled programs fall 
over.
 
> From your description, it was not clear 
whether the old binaries > stopped working on the new system, or whether 
binaries created on the > new system with the new compiler would 
break.
 
thank you for your help. old binaries still work. 
Only newly compiled ones coredump. 
 
> Also, it is not clear to me whether you have 
installed the latest > redhat version "from scratch", or overwritten your 
previous > installation. It may well be that there were still some old 
files > lying around which should have been removed but 
weren't.
 
i have overwritten my previous (2 year old) 
installation.  i suspect that your analysis is correct. alas i am not 
familiar enough with the g++ library system to work out which files are the 
troublemakers. (btw: is there an easily accessible description of the 
structure of g++ and its libraries, or do i have to read the code/man pages 
to get the picture?)
 
> To investigate this further, please try the 
following commands:
 
> ldd <your compiled program> > g++ 
-o <output file> <your source file> -v --trace-includes
 
> rpm -qf <library name>
 
the output is quoted below.
 
thanks, martin
 
i am using redhat release 6.1, kernel 2.2.12.20. 
the output of ldd is:
 
--------------------------------------------------------------------------
 
  libm.so.6 => /lib/libm.so.6 
(0x40018000)   libc.so.6 => /lib/libc.so.6 (0x40035000)   
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
 
--------------------------------------------------------------------------
 
  lsl /lib/libm.so.6   
lrwxrwxrwx   1 root     
root           13 Mar 21 23:46 
/lib/libm.so.6 -> libm-2.1.2.so   lsl /lib/libc.so.6   
lrwxrwxrwx   1 root     
root           13 Mar 21 23:46 
/lib/libc.so.6 -> libc-2.1.2.so   lsl /lib/ld-linux.so.2   
lrwxrwxrwx   1 root     
root           11 Mar 21 23:46 
/lib/ld-linux.so.2 -> ld-2.1.2.so
 
  /lib> rpm -qf libm-2.1.2.so   
glibc-2.1.2-11   /lib> rpm -qf libc-2.1.2.so   
glibc-2.1.2-11   /lib> rpm -qf ld-2.1.2.so    
glibc-2.1.2-11
 
the output of g++ with the aforementioned command 
line options is 
as follows. --------------------------------------------------------------------------
 
  Reading specs from 
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/specs   gcc 
version egcs-2.91.66 19990314 (egcs-1.1.2 release)   
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/cpp -lang-c++ -v -undef 
-D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -D__GNUC_MINOR__=91 -D__ELF__ -Dunix 
-Di386 -D__i386__ -Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__i386__ -D__linux__ 
-D__unix -D__i386 -D__linux -Asystem(posix) -D__EXCEPTIONS -H -Asystem(unix) 
-Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -Di586 -Dpentium -D__i586 
-D__i586__ -D__pentium -D__pentium__ test.cpp /tmp/ccBN0ncc.ii   GNU CPP 
version egcs-2.91.66 19990314 (egcs-1.1.2 release) (i386 Linux/ELF)   
#include "..." search starts here:   #include <...> search starts 
here:    /usr/local/include/g++    
/usr/local/include    
/usr/local/i586-pc-linux-gnu/include    
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/include    
/usr/include   End of search list.   
/usr/local/include/g++/iostream    
/usr/local/include/g++/iostream.h     
/usr/local/include/g++/streambuf.h      
/usr/include/libio.h       
/usr/include/_G_config.h        
/usr/include/bits/types.h         
/usr/include/features.h          
/usr/include/sys/cdefs.h          
/usr/include/gnu/stubs.h         
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/include/stddef.h        
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/include/stddef.h       
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/include/stdarg.h      
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/include/stdarg.h    
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/cc1plus /tmp/ccBN0ncc.ii 
-quiet -dumpbase test.cc -version -o /tmp/ccIKwR7h.s   GNU C++ version 
egcs-2.91.66 19990314 (egcs-1.1.2 release) (i586-pc-linux-gnu) compiled by GNU C 
version egcs-2.91.66 19990314 (egcs-1.1.2 release).    as -V -Qy -o 
/tmp/ccVMJY2e.o /tmp/ccIKwR7h.s   GNU assembler version 2.9.1 
(i386-redhat-linux), using BFD version 2.9.1.0.24    
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/collect2 -m elf_i386 
-dynamic-linker /lib/ld-linux.so.2 -o a.out /usr/lib/crt1.o /usr/lib/crti.o 
/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/crtbegin.o 
-L/usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66 
-L/usr/local/i586-pc-linux-gnu/lib -L/usr/local/lib /tmp/ccVMJY2e.o -lstdc++ -lm 
-lgcc -lc -lgcc /usr/local/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.66/crtend.o 
/usr/lib/crtn.o