[Bug c/32531] New: erroneous enum comparison results

[entrophage at gmail dot com]

$ gcc -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --with-cpu=generic
--host=i386-redhat-linux
Thread model: posix
gcc version 4.1.2 20070502 (Red Hat 4.1.2-12)

$ uname -a
Linux localhost.localdomain 2.6.21-1.3228.fc7 #1 SMP Tue Jun 12 15:37:31 EDT
2007 i686 i686 i386 GNU/Linux

the following code:

#include <stdio.h>


enum X
{
    A = 3,
    B = 1,
    C,
    D,
    E
};


int main()
{
    printf("%d;\n", B == A);
    printf("%d;\n", C == A);
    printf("%d;\n", D == A);
    printf("%d;\n", E == A);

    return 0;
}

compiled with:
$ gcc -Wall -Wextra -ansi -pedantic -save-temps -o foo foo.c

gives as output:
$ ./foo
0;
0;
1;
0;


-- 
           Summary: erroneous enum comparison results
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: entrophage at gmail dot com
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i386-redhat-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32531