Bizarre warning about width of argument

[Trevor Jenkins <trevor dot jenkins at suneidesis dot com>]

When the following example is compiled we get a warning:

foo.c: In function `foo':
foo.c:8: warning: passing arg 1 of `bar' with different width due to prototype

This test case is extracted from a large system where these "errors" are
being reported all over the place. The gcc comand being used is

gcc -c -ansi -fno-nonansi-builtins -Wshadow -Wconversion foo.c

Here's the real gcc command taken from the system make file:

gcc -c -Wall -Wpointer-arith -Wshadow -Wcast-qual -Wcast-align \
-Wconversion -Wid-clash-32 -Winline   -Woverloaded-virtual \
-Wmissing-prototypes -Wstrict-prototypes -Waggregate-return -Wno-implicit \
foo.c

and here's the simplest test case we can find as foo.c:

#include <string.h>

void foo(unsigned short);
void bar(unsigned short);

void foo(unsigned short zindex)
{
bar(zindex);
}

void bar(unsigned short a)
{
}

Regards, Trevor

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