bug#16825: 24.3: conflicting types for `rpl_readlink' on powerpc-apple-darwin

[Klaus Zeitler]

Building emacs 24.3 on powerpc-apple-darwin gives me the
following error:

--- snip ---

gcc -std=gnu99 -DHAVE_CONFIG_H -I. 
-I/Volumes/UFS_exp2/exptools/expmake/build/gnuemacs2src/emacs-24.3/lib -I../src 
-I/Volumes/UFS_exp2/exptools/expmake/build/gnuemacs2src/emacs-24.3/src   
-I/opt/exp/gnu/include   -g3 -O2 -MT careadlinkat.o -MD -MP -MF 
.deps/careadlinkat.Tpo -c -o careadlinkat.o careadlinkat.c
In file included from unistd.h:43,
                 from careadlinkat.h:24,
                 from careadlinkat.c:23:
/usr/include/unistd.h:240: error: conflicting types for `rpl_readlink'
unistd.h:1559: error: previous declaration of `rpl_readlink'

--- snip ---


Looking at the 2 definitions of readlink I see in /usr/include/unistd.h:

int      readlink(const char *, char *, int);


and in emacs-24.3/lib/unistd.h

_GL_FUNCDECL_RPL (readlink, ssize_t,
                  (const char *file, char *buf, size_t bufsize)
                  _GL_ARG_NONNULL ((1, 2)));


So it seems the 3rd parameter is different. Also I wonder why we include
2 different unistd.h files in the first place.


Attached is the complete configure/compile log.

expmakeout.powerpc-apple-darwin
Description: Binary data

-- 
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|  Klaus Zeitler              Alcatel-Lucent                        |
|  Lorenzstrasse 10           D-70435 Stuttgart, Germany            |
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|  Email:                     klaus.zeitler@alcatel-lucent.com      |
|                                                                   |
| Alcatel-Lucent Deutschland AG                                     |
| Sitz der Gesellschaft: Stuttgart · Amtsgericht Stuttgart HRB 4026 |
| Vorsitzender des Aufsichtsrates: Michael Oppenhoff                |
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|           Andreas Gehe                                            |
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