segfault with bitfields in structs

[Michael Walle]

>Submitter-Id:  net
>Originator:    Michael Walle
>Organization:  
>Confidential:  no
>Synopsis:      segfault with bitfields in structs
>Severity:      serious
>Priority:      medium
>Category:      c
>Class:         ice-on-legal-code
>Release:       gcc (Debian 4.3.2-1.1) 4.3.2
>Environment:
System: Linux thanatos 2.6.26-2-686-bigmem #1 SMP Thu Mar 26 02:03:34 UTC 2009 
i686 GNU/Linux
>Description:
        Compiling the following (nonsense but valid) code triggers an internal
        compiler error.
>How-To-Repeat:
        Compile the following:
        
        -- snip --
        struct s {
            unsigned int a : 4;
            unsigned int b : 28;
        };
        
        void f()
        {
            char c;
            struct s s;
            s.a = (c >> 4) & ~(1<<4);
        }
        -- snip --

        $ gcc -Wall -c bug.c 
        gcc: Internal error: Segmentation fault (program cc1)
        Please submit a full bug report.
        See <file:///usr/share/doc/gcc-4.3/README.Bugs> for instructions.
>Fix:
        not known


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