[GCC 3.2] Unexpected warning 'strchr' defined but not used

[Sam Ravnborg]

gcc emits a warning about 'strchr' being defined but not used when
compiling the following piece of code in the linux kernel:

foo.c:
#include <linux/string.h>
void foo(void)
{
	strstr(NULL, "%");
}

Inspecting the .lst file I could see that gcc recognises the
strstr with a one char string as second argument is better served with strchr.
Therefore the static extern inline version is included.

But gcc emits a warning that strchr is defined but never used in this case.

Use the following command to reproduce:

gcc -D__KERNEL__ -Iinclude -Wall -O2 -c  foo.c


Executed in the top level directory of the linux kernel (2.5.69).

Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --host=i386-redhat-linux --with-system-zlib --enable-__cxa_atexit
Thread model: posix
gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)

	Sam