c++/76: Re: g++ 2.95.2 bug report

["Martin v. Loewis" <martin at loewis dot home dot cs dot tu-berlin dot de>]

	Note: There was a bad value `[bad' for the field `>Severity:'.
	It was set to the default value of `serious'.


>Number:         76
>Category:       c++
>Synopsis:       g++ 2.95.2 bug report
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 05 12:36:01 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     Jay Baus <baus@roguewave.com>
>Release:        2.95.2
>Organization:
>Environment:
>Description:
 Original-Message-ID: <51C9F3C392D0D111A15600A0C99E64A9015189BB@localhost>
 Date: Mon, 29 Nov 1999 14:40:37 -0700

 Hello,

 The following is a bug report for the g++ 2.95.2 compiler.  

 It appears that template functions incorrectly handle const char array
 arguments.  Here's the example program:

 $ cat bug.cpp

 #include <stdio.h>

 template <class charT>
 void foo(const charT* b){
   printf("\npointer address inside foo()        -->%x\n",b);
 }

 int main(){

   char a[]="char arrays -- ok.";
   char *b="char ptrs -- ok";
   const char c[]="const char arrays -- addresses not equal";

   printf("\n%s:\npointer address passed to foo() -->%x",a,a);
   foo(a);
   printf("\n%s\npointer address passed to foo() -->%x",b,b);
   foo(b);
   printf("\n%s\npointer address passed to foo() -->%x",c,c);
   foo(c);

   return 0;
 }



 The output on my machine is:


 $ ./bug

 char arrays -- ok.:
 pointer address passed to foo() -->bffffa14
 pointer address inside foo()       -->bffffa14

 char ptrs -- ok
 pointer address passed to foo() -->8048933
 pointer address inside foo()       -->8048933

 const char arrays -- addresses not equal
 pointer address passed to foo() -->bffff9e4
 pointer address inside foo()       -->8048960



 Compilation details:


 $ g++ -v -c bug.cpp

 Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/specs
 gcc version 2.95.2 19991024 (release)
  /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/cpp -lang-c++ -v -D__GNUC__=2
 -D__GNU
 G__=2 -D__GNUC_MINOR__=95 -D__cplusplus -D__ELF__ -Dunix -D__i386__ -Dlinux
 -D__
 ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__linux -Asystem(posix)
 -D__E
 XCEPTIONS -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -Di686
 -Dpentiu
 mpro -D__i686 -D__i686__ -D__pentiumpro -D__pentiumpro__ bug.cpp
 /tmp/ccKPQffp.i
 i
 GNU CPP version 2.95.2 19991024 (release) (i386 Linux/ELF)
 #include "..." search starts here:
 #include <...> search starts here:
  /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/../../../../include/g++-3
  /usr/local/include

 /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/../../../../i686-pc-linux-gnu/incl
 ude
  /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/include
  /usr/include
 End of search list.
 The following default directories have been omitted from the search path:
 End of omitted list.
  /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/cc1plus /tmp/ccKPQffp.ii -quiet
 -dump
 base bug.cc -version -o /tmp/ccYxuoeF.s
 GNU C++ version 2.95.2 19991024 (release) (i686-pc-linux-gnu) compiled by
 GNU C
 version 2.95.2 19991024 (release).
  as -V -Qy -o bug.o /tmp/ccYxuoeF.s
 GNU assembler version 2.9.1 (i386-redhat-linux), using BFD version
 2.9.1.0.23

 $ g++ -v bug.o -o bug

 Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/specs
 gcc version 2.95.2 19991024 (release)
  /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/collect2 -m elf_i386
 -dynamic-linker
 /lib/ld-linux.so.2 -o bug /usr/lib/crt1.o /usr/lib/crti.o
 /usr/lib/gcc-lib/i686-
 pc-linux-gnu/2.95.2/crtbegin.o -L/usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2
 bug.o
  -lstdc++ -lm -lgcc -lc -lgcc
 /usr/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/crtend.o
  /usr/lib/crtn.o


 Thank You,
 Jay Baus

 =========================
 Jay M. Baus, Software Engineer
 Rogue Wave Software, Inc.   
 (303)545-3197 baus@roguewave.com  
 =========================

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