Try to further reduce the PORT dependencies.

Essentially, config.h now includes an 'os.h', which is created via
configure by linking a "port.h" file from the port directory to the
include directory.

Going to try to merge backend/port in similar ways

src/configure.in

@@ -9,7 +9,7 @@ case "$host_os" in
         esac ;;
    linux*) PORTNAME='linux' ;;
     bsdi*) PORTNAME='bsdi' ;;
- freebsd*|netbsd*) PORTNAME='BSD44_derived' ;;
+ freebsd*|netbsd*) PORTNAME='BSD44_derived';;
     dgux*) PORTNAME='dgux';;
      aix*) PORTNAME='aix';;
 nextstep*) PORTNAME='nextstep';;
@@ -25,6 +25,7 @@ nextstep*) PORTNAME='nextstep';;
    echo ""
    exit;;
 esac
+AC_LINK_FILES(port/${PORTNAME}.h, include/os.h)
 AC_SUBST(PORTNAME)
 AC_SUBST(LDFLAGS)
 AC_SUBST(CPPFLAGS)

src/include/config.h.in

@@ -93,149 +93,7 @@
  * Code below this point should not require changes
  */
 
-#if defined(aix)
-#  define CLASS_CONFLICT 
-#  define DISABLE_XOPEN_NLS 
-#  define HAVE_ANSI_CPP
-#  define HAS_TEST_AND_SET
-   typedef unsigned int slock_t;
-#endif
-
-#if defined(alpha)
-#  define USE_POSIX_TIME 
-#  define USE_POSIX_SIGNALS
-#  define DISABLE_XOPEN_NLS 
-#  define HAS_LONG_LONG
-#  define HAS_TEST_AND_SET
-#  include <sys/mman.h>  /* for msemaphore */
-   typedef msemaphore slock_t;
-#endif
-
-#if defined(BSD44_derived)
-#  define USE_POSIX_TIME
-#  define NEED_I386_TAS_ASM
-#  define HAS_TEST_AND_SET
-#  if defined(__mips__)
-/* #    undef HAS_TEST_AND_SET */
-#  endif
-   typedef unsigned char slock_t;
-#endif
-
-#if defined(bsdi)
-#  if defined(i386)
-#    define NEED_I386_TAS_ASM
-#  endif
-#  if defined(sparc)
-#    define NEED_SPARC_TAS_ASM
-#  endif
-#  define USE_POSIX_TIME
-#  define HAS_TEST_AND_SET
-   typedef unsigned char slock_t;
-#endif
-
-
-#if defined(dgux)
-#  define LINUX_ELF
-#  define USE_POSIX_SIGNALS
-#endif
-
-#if defined(hpux)
-#  define JMP_BUF
-#  define USE_POSIX_TIME
-#  define HAS_TEST_AND_SET
-   typedef struct { int sem[4]; } slock_t;
-#endif
-
-#if defined(i386_solaris) 
-#  define USE_POSIX_TIME 
-#  define USE_POSIX_SIGNALS
-#  define NO_EMPTY_STMTS
-#  define SYSV_DIRENT
-#  define HAS_TEST_AND_SET
-   typedef unsigned char slock_t;
-#endif
-
-#if defined(irix5)
-#  define USE_POSIX_TIME 
-#  define USE_POSIX_SIGNALS
-#  define NO_EMPTY_STMTS
-#  define SYSV_DIRENT
-#  define HAS_TEST_AND_SET
-#  include <abi_mutex.h>
-   typedef abilock_t slock_t;
-#endif
-
-#if defined(linux)
-/* __USE_POSIX, __USE_BSD, and __USE_BSD_SIGNAL used to be defined either
-   here or with -D compile options, but __ macros should be set and used by C
-   library macros, not Postgres code.  __USE_POSIX is set by features.h,
-   __USE_BSD is set by bsd/signal.h, and __USE_BSD_SIGNAL appears not to
-   be used.
-*/
-#  define JMP_BUF
-#  define USE_POSIX_TIME
-#  if !defined(PPC)
-#    define NEED_I386_TAS_ASM
-#    define HAS_TEST_AND_SET
-     typedef unsigned char slock_t;
-#  endif
-#endif
-
-#if defined(nextstep)
-# include <sys/ioctl.h>
-# if defined(__STRICT_ANSI__)
-#  define isascii(c)  ((unsigned)(c)<=0177)
-# endif
-  extern char* strdup (const char* string);
-# ifndef _POSIX_SOURCE
-  typedef unsigned short mode_t;
-  typedef int sigset_t;
-#  define SIG_BLOCK	00
-#  define SIG_UNBLOCK	01
-#  define SIG_SETMASK	02
-#  define NEED_SIG_JMP
-# endif
-
-# define JMP_BUF
-# define NO_WAITPID
-  typedef struct mutex slock_t;
-#endif
-
-#if defined(sparc_solaris)
-#  define USE_POSIX_TIME 
-#  define USE_POSIX_SIGNALS
-#  define NO_EMPTY_STMTS
-#  define SYSV_DIRENT
-#  define HAS_TEST_AND_SET
-typedef unsigned char slock_t;
-#endif
-
-#if defined(sunos4)
-#  define USE_POSIX_TIME
-#endif
-
-#if defined(svr4) 
-#  define USE_POSIX_TIME 
-#  define USE_POSIX_SIGNALS
-#  define NO_EMPTY_STMTS
-#  define SYSV_DIRENT
-#endif
-
-#if defined(win32)
-#  define JMP_BUF
-#  define NEED_SIG_JMP
-#  define NO_UNISTD_H
-#  define USES_WINSOCK 
-#  define NOFILE	100
-#  ifndef MAXPATHLEN
-#  define MAXPATHLEN    250
-#  endif
-#endif /* WIN32 */
-
-#if defined(ultrix4)
-#  define USE_POSIX_TIME
-#  define NEED_STRDUP
-#endif
+#include "os.h"
 
 /* This patch changes the behavior of aclcheck for groups. Currently an user
  * can access a table only if he has the required permission for ALL the groups

src/port/aix.h

+#  define CLASS_CONFLICT 
+#  define DISABLE_XOPEN_NLS 
+#  define HAVE_ANSI_CPP
+#  define HAS_TEST_AND_SET
+   typedef unsigned int slock_t;

src/port/alpha.h

+#  define USE_POSIX_TIME 
+#  define USE_POSIX_SIGNALS
+#  define DISABLE_XOPEN_NLS 
+#  define HAS_LONG_LONG
+#  define HAS_TEST_AND_SET
+#  include <sys/mman.h>  /* for msemaphore */
+   typedef msemaphore slock_t;

src/port/bsdi.h

+#  if defined(i386)
+#    define NEED_I386_TAS_ASM
+#  endif
+#  if defined(sparc)
+#    define NEED_SPARC_TAS_ASM
+#  endif
+#  define USE_POSIX_TIME
+#  define HAS_TEST_AND_SET
+   typedef unsigned char slock_t;

src/port/dgux.h

+#  define LINUX_ELF
+#  define USE_POSIX_SIGNALS

src/port/hpux.h

+#  define JMP_BUF
+#  define USE_POSIX_TIME
+#  define HAS_TEST_AND_SET
+   typedef struct { int sem[4]; } slock_t;

src/port/i386_solaris.h

+#  define USE_POSIX_TIME 
+#  define USE_POSIX_SIGNALS
+#  define NO_EMPTY_STMTS
+#  define SYSV_DIRENT
+#  define HAS_TEST_AND_SET
+   typedef unsigned char slock_t;

src/port/irix5.h

+#  define USE_POSIX_TIME 
+#  define USE_POSIX_SIGNALS
+#  define NO_EMPTY_STMTS
+#  define SYSV_DIRENT
+#  define HAS_TEST_AND_SET
+#  include <abi_mutex.h>
+   typedef abilock_t slock_t;

src/port/linux.h

+/* __USE_POSIX, __USE_BSD, and __USE_BSD_SIGNAL used to be defined either
+   here or with -D compile options, but __ macros should be set and used by C
+   library macros, not Postgres code.  __USE_POSIX is set by features.h,
+   __USE_BSD is set by bsd/signal.h, and __USE_BSD_SIGNAL appears not to
+   be used.
+*/
+#  define JMP_BUF
+#  define USE_POSIX_TIME
+#  if !defined(PPC)
+#    define NEED_I386_TAS_ASM
+#    define HAS_TEST_AND_SET
+     typedef unsigned char slock_t;
+#  endif

src/port/nextstep.h

+# include <sys/ioctl.h>
+# if defined(__STRICT_ANSI__)
+#  define isascii(c)  ((unsigned)(c)<=0177)
+# endif
+  extern char* strdup (const char* string);
+# ifndef _POSIX_SOURCE
+  typedef unsigned short mode_t;
+  typedef int sigset_t;
+#  define SIG_BLOCK	00
+#  define SIG_UNBLOCK	01
+#  define SIG_SETMASK	02
+#  define NEED_SIG_JMP
+# endif
+
+# define JMP_BUF
+# define NO_WAITPID
+  typedef struct mutex slock_t;

src/port/sparc_solaris.h

+#  define USE_POSIX_TIME 
+#  define USE_POSIX_SIGNALS
+#  define NO_EMPTY_STMTS
+#  define SYSV_DIRENT
+#  define HAS_TEST_AND_SET
+   typedef unsigned char slock_t;

src/port/sunos4.h

+#  define USE_POSIX_TIME

src/port/svr4.h

+#  define USE_POSIX_TIME 
+#  define USE_POSIX_SIGNALS
+#  define NO_EMPTY_STMTS
+#  define SYSV_DIRENT

src/port/ultrix4.h

+#  define USE_POSIX_TIME
+#  define NEED_STRDUP

src/port/win32.h

+#  define JMP_BUF
+#  define NEED_SIG_JMP
+#  define NO_UNISTD_H
+#  define USES_WINSOCK 
+#  define NOFILE	100
+#  ifndef MAXPATHLEN
+#  define MAXPATHLEN    250
+#  endif