sweetmr@sct60a.sunyct.EDU (michael sweet) (03/29/91)
I seem to have run into a nasty bug in the MIPS C compiler. When using the
'-prototypes' flag (to use function prototypes), the compiler allows local
variables to override the function's arguments. A little bit of code to
demonstrate:
TASC_CNY:~/c cat cc_proto.c
#include <stdio.h>
void somefunction(char *string)
{
int string[500];
puts(string);
}
void main()
{
somefunction("Hello World");
}
TASC_CNY:~/c cc -prototypes cc_proto.c -o cc_proto
ccom: Warning: cc_proto.c, line 7: Argument Type Doesn't Match prototype description; prototype: pointer to const unsigned char is different from actual: pointer to int
puts(string);
------------^
TASC_CNY:~/c cc_proto
TASC_CNY:~/c
As you can see from the compiler error, the local array 'string' overrides
the argument 'string'. This happens whether or not I put the declaration as
a prototype or in the old K&R format. If I omit the '-prototypes' option,
the compiler doesn't say anything at all!
Is this bug fixed in IRIX 4.0? In the meantime, I guess I'll just use the
GNU C compiler for development (and watch out for ANSI things that the MIPS
compiler doesn't support yet!)
-Mike Sweet
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