[Bug 629092] Re: gcc 4.3.2 compiler included with kubuntu fails on simple structure

[Matthias Klose]

** Changed in: gcc-defaults (Ubuntu)
       Status: New => Invalid

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Title:
  gcc 4.3.2 compiler included with kubuntu fails on simple structure

Status in “gcc-defaults” package in Ubuntu:
  Invalid

Bug description:
  I have simple test case of a program which manifests a problem I have
  in a much larger program.

  The problem is something to do with structure member access when one
  of he members is 64 bits long.  I've (tried to) include three files
  which easily reproduce the problem: main.c testrio.c and testrio.h

  I got kubuntu from a CD in "The official Ubuntu Book".  I don't know which version it is.  I subsequently installed the the gcc compiler via the GUI.  Things seemed to work well.  In fact I tested it on several simple programs.  When I started to build my main project - I had problems which I have distilled to this simple test.  You can only imagine the amount of time it takes to isolate this.  gcc -v produces
  ramey at Robert-Desktop:~/psort/nix/linux/testrio$ gcc -v
  Using built-in specs.
  Target: i486-linux-gnu
  Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.2-1ubuntu12'
  --with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs --enable-languages=c,c++
  ,fortran,objc,obj-c++ --prefix=/usr --enable-shared --with-system-zlib --libexec
  dir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --wi
  th-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3 --enable-clocale=g
  nu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all
  --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=
  i486-linux-gnu
  Thread model: posix
  gcc version 4.3.2 (Ubuntu 4.3.2-1ubuntu12)

  The attachment system here only lets me include one file.  I've
  concatonated the three files here instead:

  /******** testrio.h **********/
  #ifndef __TESTRIO__
  #define __TESTRIO__

  #define _FILE_OFFSET_BITS 64
  #include <sys/types.h> /* off_t */

  typedef struct {
  	off_t fs;
  	unsigned int i1;
  	unsigned int i2;
  } TESTRIO;

  extern int
  rio_init(TESTRIO *rio);

  #endif /* __TESTRIO__ */

  /********* testrio.c ***********/
  #include "testrio.h"

  extern int
  rio_init(TESTRIO *rio){
      rio->fs = (off_t)(-1);
      rio->i1 = 1;
      rio->i2 = 2;
      return 0;
  }

  /********* main.c ************/
  #include <stdio.h> /* printf */
  #include "testrio.h"

  int
  main(
  	int argc,
  	char *argv[]
  ){
  	TESTRIO rio; 
      rio_init(&rio);

      printf("i1=%u, i2=%u\n", rio.i1, rio.i2);
  	return 0;
  }

  I use the following command line to build this test:

  gcc -ggdb  -o testrio main.c testrio.c

  I run the test with:

  ramey at Robert-Desktop:~/psort/nix/linux/testrio$ ./testrio
  i1=4294967295, i2=1
  Bus error

  As you can see, the output is not what one would expect from looking
  at testrio.c

  Please suggest to me what I should do.

  Thank you.

  Robert Ramey

  PS.  I've compiled the same programs on my cygwin gcc 4.32 compiler with no surprises or problems. It is for this reason I suspect the gcc version distributed with ubuntu.
  RR

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