The file pyport.h contains the lines:

#ifdef SOLARIS
/* Unchecked */
extern int gethostname(char *, int);
#endif

However, Solaris already defines gethostname() 
in /usr/include/unistd.h [I only have access to Solaris 
2.6 and 2.8 so I can't vouch for other versions].

This in iteself is not a problem. However, under 
Python2.3, pyconfig.h defines _XOPEN_SOURCE and 
_XOPEN_SOURCE_EXTENDED which cause (indirectly) 
the following prototype to be selected from unitstd.h:

extern int gethostname(char *, size_t);

Since size_t is an unsigned char, a compiler error 
message is generated (both by the native compiler and 
gcc) saying that the function has been redefined.
This means that no python program can be compiled if 
SOLARIS is #defined.

I imagine that the above code from pyport.h is only 
applicable to an earlier version of Solaris than 2.6, and 
so should either be removed or qualified somehow.

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"Since size_t is an unsigned char" should read "Since size_t is 
an unsigned int".

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I can verify this issue on Solaris 10 (SunOS 5.10).  Not
only does this code seem unnecessary, but there is no
configury nor make magic which _can_ ever set the SOLARIS
preprocessor define.  If I run 'make' as follows, I can
trigger a hard compilation error:

[Python-2.4.2]$ make CFLAGS='$(BASECFLAGS) $(OPT)
-DSOLARIS=true'
...
In file included from ./Include/Python.h:55,
                 from Objects/complexobject.c:8:
./Include/pyport.h:382: error: conflicting types for
'gethostname'
/usr/include/unistd.h:319: error: previous declaration of
'gethostname' was here./Include/pyport.h:382: error:
conflicting types for 'gethostname'
/usr/include/unistd.h:319: error: previous declaration of
'gethostname' was here*** Error code 1
make: Fatal error: Command failed for target
`Objects/complexobject.o'

I recommend removing this snippet from pyport.h:

--- Include/pyport.h	(revision 41772)
+++ Include/pyport.h	(working copy)
@@ -372,11 +372,6 @@
 in platform-specific #ifdefs.
 **************************************************************************/
 
-#ifdef SOLARIS
-/* Unchecked */
-extern int gethostname(char *, int);
-#endif
-
 #ifdef __BEOS__
 /* Unchecked */
 /* It's in the libs, but not the headers... - [cjh] */

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Closed #1257687 as a duplicate.

I'll close in a couple of weeks unless someone states this is still a problem.

No reply to msg114296.

I'm not sure it was appropriate to close this bug in isolation without confirmation that it is no longer a problem, but I'm also guessing that it is in fact no longer a problem due to the fix to issue 1759169.  So because that seems likely I'm leaving it closed as out of date.