undefined reference to `strlwr' on 64bit Cygwin

[Ken Brown]

On 3/17/2013 5:51 AM, Corinna Vinschen wrote:
> On Mar 16 22:08, Ken Brown wrote:
>> $ uname -a
>> CYGWIN_NT-6.1 fiona 1.7.18(0.263/5/3) 2013-03-15 16:35 x86_64 Cygwin
>>
>> $ gcc --version
>> gcc (GCC) 4.8.0 20130307 (experimental)
>>
>> $ cat strlwr_test.c
>> #include <string.h>
>> #include <stdio.h>
>>
>> int
>> main ()
>> {
>>    char str[] = "FRED";
>>    printf ("%s\n", strlwr (str));
>> }
>>
>> $ gcc strlwr_test.c
>> /tmp/ccW2SOn8.o:strlwr_test.c:(.text+0x20): undefined reference to `strlwr'
>> /tmp/ccW2SOn8.o:strlwr_test.c:(.text+0x20): relocation truncated to
>> fit: R_X86_64_PC32 against undefined symbol `strlwr'
>> /usr/lib/gcc/x86_64-pc-cygwin/4.8.0/../../../../x86_64-pc-cygwin/bin/ld:
>> /tmp/ccW2SOn8.o: bad reloc address 0x0 in section `.pdata'
>> /usr/lib/gcc/x86_64-pc-cygwin/4.8.0/../../../../x86_64-pc-cygwin/bin/ld:
>> final link failed: Invalid operation
>> collect2: error: ld returned 1 exit status
>
> Thanks for the hint, I added it back to cygwin64.din.
>
> However, do you really use this function?  It's broken by design.  In
> theory it's one of those functions which should never have been exported
> since it only works on single-byte charsets and glibc rightfully doesn't
> provide it at all.  If you use it with UTF-8 non-ASCII chars, the result
> is random nonsense.

It's used in the cygw32 build of emacs, in w32font.c.  The native 
Windows build uses _strlwr, and Daniel added `#define _strlwr strlwr' 
for Cygwin.  Maybe he can comment on this.

Ken