possible egcs c compiler bug

Franz Sirl Franz.Sirl-kernel at lauterbach.com
Thu May 20 07:26:37 EST 1999

Am Wed, 19 May 1999 schrieb Thomas C. Allison:
>I have found what *appears* to be a bug in the C compiler.  I have experienced
>this bug in R4 (regardless of the compiler/library installed) as well as in
>the latest (i.e. all the latest packages through 5/15/1999) pre-R5
>installation.  I include a short program below which illustrates the problem
>I am having.  The code compiles without error on my i386 machine
>running RHL 5.2.  The version of EGCS on the PC is 1.0.3 versus 1.1.2 on my
>PowerMac, so I don't know if this is a PPC problem or an EGCS problem.
>Any input is greatly appreciated.
>The code is as follows:
>     #include <stdio.h>
>     #include <stdarg.h>
>     static int myFunction(va_list inList)
>     {
>        va_list newList;
>        newList = inList;
>     }
>When I try to compile the code
>     % gcc -c test.c
>I get the following error message
>     test.c: In function `myFunction':
>     test.c:7: incompatible types in assignment
>Any ideas?

That is simply unportable code. va_list maybe of any underlying type, and is in
this case an array. If you want portable code, use:

     static int myFunction(va_list inList)
        va_list newList;
        __va_copy(newList, inList);

If you use varargs extensively in your application, I strongly recommend you to
use egcs-*1.1.2-12c or later on DRR1/preR5, which fixes some annoying bugs
in the ppc-linux varargs handling.


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