pwrite warnings

[Bruno Haible]

On AIX 6.1 and 7.1, with cc, I'm seeing warnings like this:

"./../gllib/unistd.h", line 1411.12: 1506-236 (W) Macro name pwrite has been 
redefined.
"./../gllib/unistd.h", line 1411.12: 1506-358 (I) "pwrite" is defined on line 
965 of /usr/include/unistd.h.

The reason is that pwrite is #defined to pwrite64.

This should fix the warnings. Note that our pwrite already supports large files
if LFS is enabled.


2011-06-17  Bruno Haible  <address@hidden>

        pread, pwrite: Avoid cc warning on AIX.
        * lib/unistd.in.h (pread): Undefine before defining as a macro.
        (pwrite): Likewise.

--- lib/unistd.in.h.orig        Sat Jun 18 00:28:42 2011
+++ lib/unistd.in.h     Sat Jun 18 00:26:54 2011
@@ -1062,6 +1062,7 @@
    specification <http://www.opengroup.org/susv3xsh/pread.html>.  */
 # if @REPLACE_PREAD@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef pread
 #   define pread rpl_pread
 #  endif
 _GL_FUNCDECL_RPL (pread, ssize_t,
@@ -1096,6 +1097,7 @@
    <http://www.opengroup.org/susv3xsh/pwrite.html>.  */
 # if @REPLACE_PWRITE@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef pwrite
 #   define pwrite rpl_pwrite
 #  endif
 _GL_FUNCDECL_RPL (pwrite, ssize_t,

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