Assaf Gordon wrote:

> the following occur on Mac OS X 10.10.4 (and perhaps others, didn't check):
> ===
>    CC       error.o
> error.c:386:12: error: data argument not used by format string [-Werror,-Wformat-extra-args]
>             file_name, line_number);
>             ^
 > ...
>    CC       memrchr.o
> memrchr.c:71:18: error: cast from 'const unsigned char *' to 'const longword *' (aka 'const unsigned long *')
>        increases required alignment from 1 to 8 [-Werror,-Wcast-align]
>    longword_ptr = (const longword *) char_ptr;
>                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~

The above are longstanding Clang false alarms, not easily worked around as far 
as I know. We can safely ignore them.

> ===
>    CC       gzip.o
> gzip.c:1770:20: error: adding 'int' to a string does not append to the string [-Werror,-Wstring-plus-int]
>                     + 4 * tm->tm_mon),
>                     ^~~~~~~~~~~~~~~~
> gzip.c:1770:20: note: use array indexing to silence this warning
>                     + 4 * tm->tm_mon),
>                     ^

Thanks, I reproduced that with clang on Fedora 23 and worked around it by 
installing the attached patch.