Update.

	* posix/Makefile (install-others): Add $(inst_libexecdir)/getconf.
	(CFLAGS-sysconf.c): Add -D_GETCONF_DIR.
	(CFLAGS-getconf.c): New.
	($(inst_libexecdir)/getconf): New.
	* posix/confstr.c (confstr): Use __sysconf to query specifications
	that don't have _POSIX_V6_* macros defined.  Use __*_{C,LD}FLAGS
	macros defined in bits/environments.h.
	* sysdeps/posix/sysconf.c: Include stdlib.h, string.h and
	sys/stat.h.
	(__sysconf_check_spec): New routine.
	(__sysconf): Use it.
	* posix/getconf.c (specs): Change into structure array.
	(main): If -v is not given, try to get default from
	$(libexecdir)/getconf/default.  If specification is not
	supported by this getconf, try to execute
	$(libexecdir)/getconf/$(specification).
	* sysdeps/unix/bsd/bsd4.4/freebsd/bits/environments.h: New file.
	* sysdeps/unix/sysv/linux/s390/bits/environments.h: New file.
	* sysdeps/unix/sysv/linux/powerpc/bits/environments.h: New file.
	* sysdeps/unix/sysv/linux/sparc/bits/environments.h: New file.
	* sysdeps/unix/sysv/linux/i386/bits/environments.h: New file.
	* sysdeps/unix/sysv/linux/x86_64/bits/environments.h: New file.
	* sysdeps/generic/bits/environments.h (__ILP32_OFFBIG_CFLAGS):
	Define.

2004-11-26  Jakub Jelinek  <jakub@redhat.com>

13 files changed, 763 insertions, 71 deletions

diff --git a/ChangeLog b/ChangeLog
index e04b490a6e..b519ffd858 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,32 @@
 2004-11-26  Jakub Jelinek  <jakub@redhat.com>
 
+	* posix/Makefile (install-others): Add $(inst_libexecdir)/getconf.
+	(CFLAGS-sysconf.c): Add -D_GETCONF_DIR.
+	(CFLAGS-getconf.c): New.
+	($(inst_libexecdir)/getconf): New.
+	* posix/confstr.c (confstr): Use __sysconf to query specifications
+	that don't have _POSIX_V6_* macros defined.  Use __*_{C,LD}FLAGS
+	macros defined in bits/environments.h.
+	* sysdeps/posix/sysconf.c: Include stdlib.h, string.h and
+	sys/stat.h.
+	(__sysconf_check_spec): New routine.
+	(__sysconf): Use it.
+	* posix/getconf.c (specs): Change into structure array.
+	(main): If -v is not given, try to get default from
+	$(libexecdir)/getconf/default.  If specification is not
+	supported by this getconf, try to execute
+	$(libexecdir)/getconf/$(specification).
+	* sysdeps/unix/bsd/bsd4.4/freebsd/bits/environments.h: New file.
+	* sysdeps/unix/sysv/linux/s390/bits/environments.h: New file.
+	* sysdeps/unix/sysv/linux/powerpc/bits/environments.h: New file.
+	* sysdeps/unix/sysv/linux/sparc/bits/environments.h: New file.
+	* sysdeps/unix/sysv/linux/i386/bits/environments.h: New file.
+	* sysdeps/unix/sysv/linux/x86_64/bits/environments.h: New file.
+	* sysdeps/generic/bits/environments.h (__ILP32_OFFBIG_CFLAGS):
+	Define.
+
+2004-11-26  Jakub Jelinek  <jakub@redhat.com>
+
 	* stdlib/stdlib.h (setenv): Use nonnull only for second argument.
 	(unsetenv): Remove.
 
diff --git a/bits/environments.h b/bits/environments.h
index c3829927bc..4617dc45f2 100644
--- a/bits/environments.h
+++ b/bits/environments.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1999, 2001 Free Software Foundation, Inc.
+/* Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -72,4 +72,7 @@
 # define _XBS5_LP64_OFF64	-1
 # define _XBS5_LPBIG_OFFBIG	-1
 
+/* CFLAGS.  */
+#define __ILP32_OFFBIG_CFLAGS   "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
+
 #endif /* __WORDSIZE == 32 */
diff --git a/posix/Makefile b/posix/Makefile
index c89cfc0b41..faee4bbd54 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -91,6 +91,7 @@ tests           += wordexp-test tst-exec tst-spawn
 endif
 others		:= getconf
 install-bin	:= getconf
+install-others	:= $(inst_libexecdir)/getconf
 
 before-compile	:= testcases.h ptestcases.h
 
@@ -138,7 +139,7 @@ CFLAGS-waitid.c = -fexceptions
 CFLAGS-waitpid.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-getopt.c = -fexceptions
 CFLAGS-wordexp.c = -fexceptions
-CFLAGS-sysconf.c = -fexceptions
+CFLAGS-sysconf.c = -fexceptions -DGETCONF_DIR='"$(libexecdir)/getconf"'
 CFLAGS-pathconf.c = -fexceptions
 CFLAGS-fpathconf.c = -fexceptions
 CFLAGS-spawn.c = -fexceptions
@@ -147,6 +148,7 @@ CFLAGS-spawni.c = -fexceptions
 CFLAGS-pause.c = -fexceptions
 CFLAGS-glob.c = $(uses-callbacks) -fexceptions
 CFLAGS-glob64.c = $(uses-callbacks) -fexceptions
+CFLAGS-getconf.c = -DGETCONF_DIR='"$(libexecdir)/getconf"'
 
 tstgetopt-ARGS = -a -b -cfoobar --required foobar --optional=bazbug \
 		--none random --col --color --colour
@@ -260,3 +262,13 @@ bug-glob2-ENV = MALLOC_TRACE=$(objpfx)bug-glob2.mtrace
 
 $(objpfx)bug-glob2-mem: $(objpfx)bug-glob2.out
 	$(common-objpfx)malloc/mtrace $(objpfx)bug-glob2.mtrace > $@
+
+$(inst_libexecdir)/getconf: $(objpfx)getconf FORCE
+	$(addprefix $(..)./scripts/mkinstalldirs ,\
+		    $(filter-out $(wildcard $@),$@))
+	for spec in `LC_ALL=C GETCONF_DIR=/dev/null \
+		     $(run-program-prefix) $< \
+		     _POSIX_V6_WIDTH_RESTRICTED_ENVS`; do \
+		$(INSTALL_PROGRAM) $< $@/$$spec.new; \
+		mv -f $@/$$spec.new $@/$$spec; \
+	done
diff --git a/posix/confstr.c b/posix/confstr.c
index ace60fd273..6b0dcf0c20 100644
--- a/posix/confstr.c
+++ b/posix/confstr.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1991,96,97,2000-2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1996, 1997, 2000-2002, 2003, 2004
+   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -54,50 +55,153 @@ confstr (name, buf, len)
 
 	 Currently this means all environment which the system allows.  */
       {
-	static const char restenvs[] =
-#if _POSIX_V6_ILP32_OFF32 > 0
-	"_POSIX_V6_ILP32_OFF32"
+	char restenvs[4 * sizeof "_POSIX_V6_LPBIG_OFFBIG"];
+
+	string_len = 0;
+#ifndef _POSIX_V6_ILP32_OFF32
+        if (__sysconf (_SC_V6_ILP32_OFF32) > 0)
 #endif
-#if _POSIX_V6_ILP32_OFFBIG > 0
-# if _POSIX_V6_ILP32_OFF32 > 0
-	"\n"
-# endif
-	"_POSIX_V6_ILP32_OFFBIG"
+#if !defined _POSIX_V6_ILP32_OFF32 || _POSIX_V6_ILP32_OFF32 > 0
+          {
+            memcpy (restenvs + string_len, "_POSIX_V6_ILP32_OFF32",
+                    sizeof "_POSIX_V6_ILP32_OFF32" - 1);
+            string_len += sizeof "_POSIX_V6_ILP32_OFF32" - 1;
+          }
 #endif
-#if _POSIX_V6_LP64_OFF64 > 0
-# if _POSIX_V6_ILP32_OFF32 > 0 || _POSIX_V6_ILP32_OFFBIG > 0
-	"\n"
-# endif
-	"_POSIX_V6_LP64_OFF64"
+#ifndef _POSIX_V6_ILP32_OFFBIG
+        if (__sysconf (_SC_V6_ILP32_OFFBIG) > 0)
 #endif
-#if _POSIX_V6_LPBIG_OFFBIG > 0
-# if _POSIX_V6_ILP32_OFF32 > 0 || _POSIX_V6_ILP32_OFFBIG > 0 \
-     || _POSIX_V6_LP64_OFF64 > 0
-	"\n"
-# endif
-	"_POSIX_V6_LPBIG_OFFBIG"
+#if !defined _POSIX_V6_ILP32_OFFBIG || _POSIX_V6_ILP32_OFFBIG > 0
+          {
+            if (string_len)
+              restenvs[string_len++] = '\n';
+            memcpy (restenvs + string_len, "_POSIX_V6_ILP32_OFFBIG",
+                    sizeof "_POSIX_V6_ILP32_OFFBIG" - 1);
+            string_len += sizeof "_POSIX_V6_ILP32_OFFBIG" - 1;
+          }
+#endif
+#ifndef _POSIX_V6_LP64_OFF64
+        if (__sysconf (_SC_V6_LP64_OFF64) > 0)
+#endif
+#if !defined _POSIX_V6_LP64_OFF64 || _POSIX_V6_LP64_OFF64 > 0
+          {
+            if (string_len)
+              restenvs[string_len++] = '\n';
+            memcpy (restenvs + string_len, "_POSIX_V6_LP64_OFF64",
+                    sizeof "_POSIX_V6_LP64_OFF64" - 1);
+            string_len += sizeof "_POSIX_V6_LP64_OFF64" - 1;
+          }
+#endif
+#ifndef _POSIX_V6_LPBIG_OFFBIG
+        if (__sysconf (_SC_V6_LPBIG_OFFBIG) > 0)
+#endif
+#if !defined _POSIX_V6_LPBIG_OFFBIG || _POSIX_V6_LPBIG_OFFBIG > 0
+          {
+            if (string_len)
+              restenvs[string_len++] = '\n';
+            memcpy (restenvs + string_len, "_POSIX_V6_LPBIG_OFFBIG",
+                    sizeof "_POSIX_V6_LPBIG_OFFBIG" - 1);
+            string_len += sizeof "_POSIX_V6_LPBIG_OFFBIG" - 1;
+          }
 #endif
-	  ;
+        restenvs[string_len++] = '\0';
 	string = restenvs;
-	string_len = sizeof (restenvs);
       }
       break;
 
+    case _CS_XBS5_ILP32_OFF32_CFLAGS:
+    case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
+#ifdef __ILP32_OFF32_CFLAGS
+# if _POSIX_V6_ILP32_OFF32 == -1
+#  error __ILP32_OFF32_CFLAGS shouldn't be defined
+# elif !defined _POSIX_V6_ILP32_OFF32
+      if (__sysconf (_SC_V6_ILP32_OFF32) < 0)
+        break;
+# endif
+      string = __ILP32_OFF32_CFLAGS;
+      string_len = sizeof (__ILP32_OFF32_CFLAGS);
+#endif
+      break;
+
     case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
     case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
+#ifdef __ILP32_OFFBIG_CFLAGS
+# if _POSIX_V6_ILP32_OFFBIG == -1
+#  error __ILP32_OFFBIG_CFLAGS shouldn't be defined
+# elif !defined _POSIX_V6_ILP32_OFFBIG
+      if (__sysconf (_SC_V6_ILP32_OFFBIG) < 0)
+        break;
+# endif
+      string = __ILP32_OFFBIG_CFLAGS;
+      string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
+#endif
+      break;
+
+    case _CS_XBS5_LP64_OFF64_CFLAGS:
+    case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
+#ifdef __LP64_OFF64_CFLAGS
+# if _POSIX_V6_LP64_OFF64 == -1
+#  error __LP64_OFF64_CFLAGS shouldn't be defined
+# elif !defined _POSIX_V6_LP64_OFF64
+      if (__sysconf (_SC_V6_LP64_OFF64) < 0)
+        break;
+# endif
+      string = __LP64_OFF64_CFLAGS;
+      string_len = sizeof (__LP64_OFF64_CFLAGS);
+#endif
+      break;
+
+    case _CS_XBS5_ILP32_OFF32_LDFLAGS:
+    case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
+#ifdef __ILP32_OFF32_LDFLAGS
+# if _POSIX_V6_ILP32_OFF32 == -1
+#  error __ILP32_OFF32_LDFLAGS shouldn't be defined
+# elif !defined _POSIX_V6_ILP32_OFF32
+      if (__sysconf (_SC_V6_ILP32_OFF32) < 0)
+        break;
+# endif
+      string = __ILP32_OFF32_LDFLAGS;
+      string_len = sizeof (__ILP32_OFF32_LDFLAGS);
+#endif
+      break;
+
+    case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
+    case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
+#ifdef __ILP32_OFFBIG_LDFLAGS
+# if _POSIX_V6_ILP32_OFFBIG == -1
+#  error __ILP32_OFFBIG_LDFLAGS shouldn't be defined
+# elif !defined _POSIX_V6_ILP32_OFFBIG
+      if (__sysconf (_SC_V6_ILP32_OFFBIG) < 0)
+        break;
+# endif
+      string = __ILP32_OFFBIG_LDFLAGS;
+      string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
+#endif
+      break;
+
+    case _CS_XBS5_LP64_OFF64_LDFLAGS:
+    case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
+#ifdef __LP64_OFF64_LDFLAGS
+# if _POSIX_V6_LP64_OFF64 == -1
+#  error __LP64_OFF64_LDFLAGS shouldn't be defined
+# elif !defined _POSIX_V6_LP64_OFF64
+      if (__sysconf (_SC_V6_LP64_OFF64) < 0)
+        break;
+# endif
+      string = __LP64_OFF64_LDFLAGS;
+      string_len = sizeof (__LP64_OFF64_LDFLAGS);
+#endif
+      break;
+
     case _CS_LFS_CFLAGS:
     case _CS_LFS_LINTFLAGS:
-#if _XBS5_LP64_OFF64 == -1 && _XBS5_LPBIG_OFFBIG == -1 && _XBS5_ILP32_OFFBIG == 1
+#if _POSIX_V6_ILP32_OFF32 == 1 && _POSIX_V6_ILP32_OFFBIG == 1
+# define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
       /* Signal that we want the new ABI.  */
-      {
-	static const char file_offset[]
-	  = "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64";
-	string = file_offset;
-	string_len = sizeof (file_offset);
-      }
-      break;
+      string = __LFS_CFLAGS;
+      string_len = sizeof (__LFS_CFLAGS);
 #endif
-      /* FALLTHROUGH */
+      break;
 
     case _CS_LFS_LDFLAGS:
     case _CS_LFS_LIBS:
@@ -106,12 +210,9 @@ confstr (name, buf, len)
 
     case _CS_LFS64_CFLAGS:
     case _CS_LFS64_LINTFLAGS:
-      if (sizeof (off_t) != sizeof (off64_t))
-	{
-	  static const char lf64_source[] = "-D_LARGEFILE64_SOURCE";
-	  string = lf64_source;
-	  string_len = sizeof (lf64_source);
-	}
+#define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
+      string = __LFS64_CFLAGS;
+      string_len = sizeof (__LFS64_CFLAGS);
       break;
 
     case _CS_LFS64_LDFLAGS:
@@ -119,15 +220,10 @@ confstr (name, buf, len)
       /* No special libraries or linker flags needed.  */
       break;
 
-    case _CS_XBS5_ILP32_OFF32_CFLAGS:
-    case _CS_XBS5_ILP32_OFF32_LDFLAGS:
     case _CS_XBS5_ILP32_OFF32_LIBS:
     case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
-    case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
     case _CS_XBS5_ILP32_OFFBIG_LIBS:
     case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
-    case _CS_XBS5_LP64_OFF64_CFLAGS:
-    case _CS_XBS5_LP64_OFF64_LDFLAGS:
     case _CS_XBS5_LP64_OFF64_LIBS:
     case _CS_XBS5_LP64_OFF64_LINTFLAGS:
     case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
@@ -135,15 +231,10 @@ confstr (name, buf, len)
     case _CS_XBS5_LPBIG_OFFBIG_LIBS:
     case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
 
-    case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
-    case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
     case _CS_POSIX_V6_ILP32_OFF32_LIBS:
     case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
-    case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
     case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
     case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
-    case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
-    case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
     case _CS_POSIX_V6_LP64_OFF64_LIBS:
     case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
     case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
diff --git a/posix/getconf.c b/posix/getconf.c
index 2f68003ff3..6175dfec26 100644
--- a/posix/getconf.c
+++ b/posix/getconf.c
@@ -917,12 +917,12 @@ static const struct conf vars[] =
   };
 
 
-static const char *specs[] =
+static struct { const char *name; int num; } specs[] =
   {
-    "POSIX_V6_ILP32_OFF32",
-    "POSIX_V6_ILP32_OFFBIG",
-    "POSIX_V6_LP64_OFF64",
-    "POSIX_V6_LPBIG_OFFBIG"
+    { "POSIX_V6_ILP32_OFF32", _SC_V6_ILP32_OFF32 },
+    { "POSIX_V6_ILP32_OFFBIG", _SC_V6_ILP32_OFFBIG },
+    { "POSIX_V6_LP64_OFF64", _SC_V6_LP64_OFF64 },
+    { "POSIX_V6_LPBIG_OFFBIG", _SC_V6_LPBIG_OFFBIG }
   };
 static const int nspecs = sizeof (specs) / sizeof (specs[0]);
 
@@ -963,11 +963,14 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
       return 0;
     }
 
+  const char *getconf_dir = getenv ("GETCONF_DIR") ?: GETCONF_DIR;
+  size_t getconf_dirlen = strlen (getconf_dir);
+
+  const char *spec = NULL;
+  char buf[sizeof "POSIX_V6_LPBIG_OFFBIG"];
+  char *argv0 = argv[0];
   if (argc > 1 && strncmp (argv[1], "-v", 2) == 0)
     {
-      const char *spec;
-      int i;
-
       if (argv[1][2] == '\0')
 	{
 	  if (argc < 3)
@@ -983,18 +986,62 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
 	  argv += 1;
 	  argc += 1;
 	}
+    }
+  else
+    {
+      char default_name[getconf_dirlen + sizeof "/default"];
+      memcpy (mempcpy (default_name, getconf_dir, getconf_dirlen),
+              "/default", sizeof "/default");
+      int len = readlink (default_name, buf, sizeof buf - 1);
+      if (len > 0)
+	{
+	  buf[len] = '\0';
+	  spec = buf;
+	}
+    }
 
-      /* Check for the specifications we know.  This is simple in the
-	 moment.  */
+  /* Check for the specifications we know.  */
+  if (spec != NULL)
+    {
+      int i;
       for (i = 0; i < nspecs; ++i)
-	if (strcmp (spec, specs[i]) == 0)
+	if (strcmp (spec, specs[i].name) == 0)
 	  break;
 
       if (i == nspecs)
 	error (2, 0, _("unknown specification \"%s\""), spec);
 
-      /* And now we forget the specification.  We don't do anything different
-	 with or without it.  */
+      switch (specs[i].num)
+	{
+#ifndef _POSIX_V6_ILP32_OFF32
+	  case _SC_V6_ILP32_OFF32:
+#endif
+#ifndef _POSIX_V6_ILP32_OFFBIG
+	  case _SC_V6_ILP32_OFFBIG:
+#endif
+#ifndef _POSIX_V6_LP64_OFF64
+	  case _SC_V6_LP64_OFF64:
+#endif
+#ifndef _POSIX_V6_LPBIG_OFFBIG
+	  case _SC_V6_LPBIG_OFFBIG:
+#endif
+	    {
+	      const char *args[argc + 3];
+	      size_t spec_len = strlen (spec);
+	      char getconf_name[getconf_dirlen + 2 + spec_len + 1];
+	      memcpy (mempcpy (mempcpy (getconf_name, getconf_dir,
+	                                getconf_dirlen),
+                               "/_", 2), spec, spec_len + 1);
+	      args[0] = argv0;
+	      args[1] = "-v";
+	      args[2] = spec;
+	      memcpy (&args[3], &argv[1], argc * sizeof (argv[1]));
+	      execv (getconf_name, (char * const *) args);
+	      error (4, errno, _("Couldn't execute %s"), getconf_name);
+	    }
+	  default:
+	    break;
+	}
     }
 
   if (argc < 2 || argc > 3)
diff --git a/sysdeps/generic/bits/environments.h b/sysdeps/generic/bits/environments.h
index c3829927bc..4617dc45f2 100644
--- a/sysdeps/generic/bits/environments.h
+++ b/sysdeps/generic/bits/environments.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1999, 2001 Free Software Foundation, Inc.
+/* Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -72,4 +72,7 @@
 # define _XBS5_LP64_OFF64	-1
 # define _XBS5_LPBIG_OFFBIG	-1
 
+/* CFLAGS.  */
+#define __ILP32_OFFBIG_CFLAGS   "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
+
 #endif /* __WORDSIZE == 32 */
diff --git a/sysdeps/posix/sysconf.c b/sysdeps/posix/sysconf.c
index d1286a06fe..de81c2120b 100644
--- a/sysdeps/posix/sysconf.c
+++ b/sysdeps/posix/sysconf.c
@@ -23,14 +23,20 @@
 #include <pwd.h>
 #include <stddef.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <time.h>
 #include <unistd.h>
 #include <sys/param.h>
+#include <sys/stat.h>
 #include <sys/sysinfo.h>
 #include <sys/types.h>
 #include <regex.h>
 
 
+static long int __sysconf_check_spec (const char *spec);
+
+
 /* Get the value of the system variable NAME.  */
 long int
 __sysconf (name)
@@ -781,50 +787,50 @@ __sysconf (name)
 #ifdef _XBS5_ILP32_OFF32
       return _XBS5_ILP32_OFF32;
 #else
-      return -1;
+      return __sysconf_check_spec ("ILP32_OFF32");
 #endif
     case _SC_XBS5_ILP32_OFFBIG:
 #ifdef _XBS5_ILP32_OFFBIG
       return _XBS5_ILP32_OFFBIG;
 #else
-      return -1;
+      return __sysconf_check_spec ("ILP32_OFFBIG");
 #endif
     case _SC_XBS5_LP64_OFF64:
 #ifdef _XBS5_LP64_OFF64
       return _XBS5_LP64_OFF64;
 #else
-      return -1;
+      return __sysconf_check_spec ("LP64_OFF64");
 #endif
     case _SC_XBS5_LPBIG_OFFBIG:
 #ifdef _XBS5_LPBIG_OFFBIG
       return _XBS5_LPBIG_OFFBIG;
 #else
-      return -1;
+      return __sysconf_check_spec ("LPBIG_OFFBIG");
 #endif
 
     case _SC_V6_ILP32_OFF32:
 #ifdef _POSIX_V6_ILP32_OFF32
       return _POSIX_V6_ILP32_OFF32;
 #else
-      return -1;
+      return __sysconf_check_spec ("ILP32_OFF32");
 #endif
     case _SC_V6_ILP32_OFFBIG:
 #ifdef _POSIX_V6_ILP32_OFFBIG
       return _POSIX_V6_ILP32_OFFBIG;
 #else
-      return -1;
+      return __sysconf_check_spec ("ILP32_OFFBIG");
 #endif
     case _SC_V6_LP64_OFF64:
 #ifdef _POSIX_V6_LP64_OFF64
       return _POSIX_V6_LP64_OFF64;
 #else
-      return -1;
+      return __sysconf_check_spec ("LP64_OFF64");
 #endif
     case _SC_V6_LPBIG_OFFBIG:
 #ifdef _POSIX_V6_LPBIG_OFFBIG
       return _POSIX_V6_LPBIG_OFFBIG;
 #else
-      return -1;
+      return __sysconf_check_spec ("LPBIG_OFFBIG");
 #endif
 
     case _SC_XOPEN_LEGACY:
@@ -1189,3 +1195,24 @@ __sysconf (name)
 #undef __sysconf
 weak_alias (__sysconf, sysconf)
 libc_hidden_def (__sysconf)
+
+static long int
+__sysconf_check_spec (const char *spec)
+{
+  int save_errno = errno;
+
+  const char *getconf_dir = __secure_getenv ("GETCONF_DIR") ?: GETCONF_DIR;
+  size_t getconf_dirlen = strlen (getconf_dir);
+  size_t speclen = strlen (spec);
+
+  char name[getconf_dirlen + sizeof ("/_POSIX_V6_") + speclen];
+  memcpy (mempcpy (mempcpy (name, getconf_dir, getconf_dirlen),
+		   "/_POSIX_V6_", sizeof ("/_POSIX_V6_") - 1),
+	  spec, speclen + 1);
+
+  struct stat64 st;
+  long int ret = __xstat64 (_STAT_VER, name, &st) >= 0 ? 1 : -1;
+
+  __set_errno (save_errno);
+  return ret;
+}
diff --git a/sysdeps/unix/bsd/bsd4.4/freebsd/bits/environments.h b/sysdeps/unix/bsd/bsd4.4/freebsd/bits/environments.h
new file mode 100644
index 0000000000..92112b554c
--- /dev/null
+++ b/sysdeps/unix/bsd/bsd4.4/freebsd/bits/environments.h
@@ -0,0 +1,72 @@
+/* Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _UNISTD_H
+# error "Never include this file directly.  Use <unistd.h> instead"
+#endif
+
+#include <bits/wordsize.h>
+
+/* This header should define the following symbols under the described
+   situations.  A value `1' means that the model is always supported,
+   `-1' means it is never supported.  Undefined means it cannot be
+   statically decided.
+
+   _POSIX_V6_ILP32_OFF32   32bit int, long, pointers, and off_t type
+   _POSIX_V6_ILP32_OFFBIG  32bit int, long, and pointers and larger off_t type
+
+   _POSIX_V6_LP64_OFF32	   64bit long and pointers and 32bit off_t type
+   _POSIX_V6_LPBIG_OFFBIG  64bit long and pointers and large off_t type
+
+   The macros _XBS5_ILP32_OFF32, _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and
+   _XBS5_LPBIG_OFFBIG were used in previous versions of the Unix standard
+   and are available only for compatibility.
+*/
+
+#if __WORDSIZE == 64
+
+/* We can never provide environments with 32-bit wide pointers.  */
+# define _POSIX_V6_ILP32_OFF32	-1
+# define _POSIX_V6_ILP32_OFFBIG	-1
+# define _XBS5_ILP32_OFF32	-1
+# define _XBS5_ILP32_OFFBIG	-1
+/* We also have no use (for now) for an environment with bigger pointers
+   and offsets.  */
+# define _POSIX_V6_LPBIG_OFFBIG	-1
+# define _XBS5_LPBIG_OFFBIG	-1
+
+/* By default we have 64-bit wide `long int', pointers and `off_t'.  */
+# define _POSIX_V6_LP64_OFF64	1
+# define _XBS5_LP64_OFF64	1
+
+#else /* __WORDSIZE == 32 */
+
+/* By default we have 32-bit wide `int', `long int', pointers
+   and 64-bit `off_t'.  */
+# define _POSIX_V6_ILP32_OFF32	-1
+# define _POSIX_V6_ILP32_OFFBIG	1
+# define _XBS5_ILP32_OFF32	-1
+# define _XBS5_ILP32_OFFBIG	1
+
+/* We can never provide environments with 64-bit wide pointers.  */
+# define _POSIX_V6_LP64_OFF64	-1
+# define _POSIX_V6_LPBIG_OFFBIG	-1
+# define _XBS5_LP64_OFF64	-1
+# define _XBS5_LPBIG_OFFBIG	-1
+
+#endif /* __WORDSIZE == 32 */
diff --git a/sysdeps/unix/sysv/linux/i386/bits/environments.h b/sysdeps/unix/sysv/linux/i386/bits/environments.h
new file mode 100644
index 0000000000..16f7732aad
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/i386/bits/environments.h
@@ -0,0 +1,62 @@
+/* Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _UNISTD_H
+# error "Never include this file directly.  Use <unistd.h> instead"
+#endif
+
+/* This header should define the following symbols under the described
+   situations.  A value `1' means that the model is always supported,
+   `-1' means it is never supported.  Undefined means it cannot be
+   statically decided.
+
+   _POSIX_V6_ILP32_OFF32   32bit int, long, pointers, and off_t type
+   _POSIX_V6_ILP32_OFFBIG  32bit int, long, and pointers and larger off_t type
+
+   _POSIX_V6_LP64_OFF32	   64bit long and pointers and 32bit off_t type
+   _POSIX_V6_LPBIG_OFFBIG  64bit long and pointers and large off_t type
+
+   The macros _XBS5_ILP32_OFF32, _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and
+   _XBS5_LPBIG_OFFBIG were used in previous versions of the Unix standard
+   and are available only for compatibility.
+*/
+
+/* By default we have 32-bit wide `int', `long int', pointers and `off_t'
+   and all platforms support LFS.  */
+#define _POSIX_V6_ILP32_OFF32	1
+#define _POSIX_V6_ILP32_OFFBIG	1
+#define _XBS5_ILP32_OFF32	1
+#define _XBS5_ILP32_OFFBIG	1
+
+/* We optionally provide an environment with the above size but an 64-bit
+   side `off_t'.  Therefore we don't define _XBS5_ILP32_OFFBIG.  */
+
+/* Environments with 64-bit wide pointers can be provided,
+   so these macros aren't defined:
+   # undef _POSIX_V6_LP64_OFF64
+   # undef _POSIX_V6_LPBIG_OFFBIG
+   # undef _XBS5_LP64_OFF64
+   # undef _XBS5_LPBIG_OFFBIG
+   and sysconf tests for it at runtime.  */
+
+#define __ILP32_OFF32_CFLAGS	"-m32"
+#define __ILP32_OFFBIG_CFLAGS	"-m32 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
+#define __ILP32_OFF32_LDFLAGS	"-m32"
+#define __ILP32_OFFBIG_LDFLAGS	"-m32"
+#define __LP64_OFF64_CFLAGS	"-m64"
+#define __LP64_OFF64_LDFLAGS	"-m64"
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/environments.h b/sysdeps/unix/sysv/linux/powerpc/bits/environments.h
new file mode 100644
index 0000000000..a51a564cbb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/environments.h
@@ -0,0 +1,87 @@
+/* Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _UNISTD_H
+# error "Never include this file directly.  Use <unistd.h> instead"
+#endif
+
+#include <bits/wordsize.h>
+
+/* This header should define the following symbols under the described
+   situations.  A value `1' means that the model is always supported,
+   `-1' means it is never supported.  Undefined means it cannot be
+   statically decided.
+
+   _POSIX_V6_ILP32_OFF32   32bit int, long, pointers, and off_t type
+   _POSIX_V6_ILP32_OFFBIG  32bit int, long, and pointers and larger off_t type
+
+   _POSIX_V6_LP64_OFF32	   64bit long and pointers and 32bit off_t type
+   _POSIX_V6_LPBIG_OFFBIG  64bit long and pointers and large off_t type
+
+   The macros _XBS5_ILP32_OFF32, _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and
+   _XBS5_LPBIG_OFFBIG were used in previous versions of the Unix standard
+   and are available only for compatibility.
+*/
+
+#if __WORDSIZE == 64
+
+/* Environments with 32-bit wide pointers are optionally provided.
+   Therefore following macros aren't defined:
+   # undef _POSIX_V6_ILP32_OFF32
+   # undef _POSIX_V6_ILP32_OFFBIG
+   # undef _XBS5_ILP32_OFF32
+   # undef _XBS5_ILP32_OFFBIG
+   and users need to check at runtime.  */
+
+/* We also have no use (for now) for an environment with bigger pointers
+   and offsets.  */
+# define _POSIX_V6_LPBIG_OFFBIG	-1
+# define _XBS5_LPBIG_OFFBIG	-1
+
+/* By default we have 64-bit wide `long int', pointers and `off_t'.  */
+# define _POSIX_V6_LP64_OFF64	1
+# define _XBS5_LP64_OFF64	1
+
+#else /* __WORDSIZE == 32 */
+
+/* By default we have 32-bit wide `int', `long int', pointers and `off_t'
+   and all platforms support LFS.  */
+# define _POSIX_V6_ILP32_OFF32	1
+# define _POSIX_V6_ILP32_OFFBIG	1
+# define _XBS5_ILP32_OFF32	1
+# define _XBS5_ILP32_OFFBIG	1
+
+/* We optionally provide an environment with the above size but an 64-bit
+   side `off_t'.  Therefore we don't define _XBS5_ILP32_OFFBIG.  */
+
+/* Environments with 64-bit wide pointers can be provided,
+   so these macros aren't defined:
+   # undef _POSIX_V6_LP64_OFF64
+   # undef _POSIX_V6_LPBIG_OFFBIG
+   # undef _XBS5_LP64_OFF64
+   # undef _XBS5_LPBIG_OFFBIG
+   and sysconf tests for it at runtime.  */
+
+#endif /* __WORDSIZE == 32 */
+
+#define __ILP32_OFF32_CFLAGS	"-m32"
+#define __ILP32_OFFBIG_CFLAGS	"-m32 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
+#define __ILP32_OFF32_LDFLAGS	"-m32"
+#define __ILP32_OFFBIG_LDFLAGS	"-m32"
+#define __LP64_OFF64_CFLAGS	"-m64"
+#define __LP64_OFF64_LDFLAGS	"-m64"
diff --git a/sysdeps/unix/sysv/linux/s390/bits/environments.h b/sysdeps/unix/sysv/linux/s390/bits/environments.h
new file mode 100644
index 0000000000..713d21c9a5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/s390/bits/environments.h
@@ -0,0 +1,87 @@
+/* Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _UNISTD_H
+# error "Never include this file directly.  Use <unistd.h> instead"
+#endif
+
+#include <bits/wordsize.h>
+
+/* This header should define the following symbols under the described
+   situations.  A value `1' means that the model is always supported,
+   `-1' means it is never supported.  Undefined means it cannot be
+   statically decided.
+
+   _POSIX_V6_ILP32_OFF32   32bit int, long, pointers, and off_t type
+   _POSIX_V6_ILP32_OFFBIG  32bit int, long, and pointers and larger off_t type
+
+   _POSIX_V6_LP64_OFF32	   64bit long and pointers and 32bit off_t type
+   _POSIX_V6_LPBIG_OFFBIG  64bit long and pointers and large off_t type
+
+   The macros _XBS5_ILP32_OFF32, _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and
+   _XBS5_LPBIG_OFFBIG were used in previous versions of the Unix standard
+   and are available only for compatibility.
+*/
+
+#if __WORDSIZE == 64
+
+/* Environments with 32-bit wide pointers are optionally provided.
+   Therefore following macros aren't defined:
+   # undef _POSIX_V6_ILP32_OFF32
+   # undef _POSIX_V6_ILP32_OFFBIG
+   # undef _XBS5_ILP32_OFF32
+   # undef _XBS5_ILP32_OFFBIG
+   and users need to check at runtime.  */
+
+/* We also have no use (for now) for an environment with bigger pointers
+   and offsets.  */
+# define _POSIX_V6_LPBIG_OFFBIG	-1
+# define _XBS5_LPBIG_OFFBIG	-1
+
+/* By default we have 64-bit wide `long int', pointers and `off_t'.  */
+# define _POSIX_V6_LP64_OFF64	1
+# define _XBS5_LP64_OFF64	1
+
+#else /* __WORDSIZE == 32 */
+
+/* By default we have 32-bit wide `int', `long int', pointers and `off_t'
+   and all platforms support LFS.  */
+# define _POSIX_V6_ILP32_OFF32	1
+# define _POSIX_V6_ILP32_OFFBIG	1
+# define _XBS5_ILP32_OFF32	1
+# define _XBS5_ILP32_OFFBIG	1
+
+/* We optionally provide an environment with the above size but an 64-bit
+   side `off_t'.  Therefore we don't define _XBS5_ILP32_OFFBIG.  */
+
+/* Environments with 64-bit wide pointers can be provided,
+   so these macros aren't defined:
+   # undef _POSIX_V6_LP64_OFF64
+   # undef _POSIX_V6_LPBIG_OFFBIG
+   # undef _XBS5_LP64_OFF64
+   # undef _XBS5_LPBIG_OFFBIG
+   and sysconf tests for it at runtime.  */
+
+#endif /* __WORDSIZE == 32 */
+
+#define __ILP32_OFF32_CFLAGS	"-m31"
+#define __ILP32_OFFBIG_CFLAGS	"-m31 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
+#define __ILP32_OFF32_LDFLAGS	"-m31"
+#define __ILP32_OFFBIG_LDFLAGS	"-m31"
+#define __LP64_OFF64_CFLAGS	"-m64"
+#define __LP64_OFF64_LDFLAGS	"-m64"
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/environments.h b/sysdeps/unix/sysv/linux/sparc/bits/environments.h
new file mode 100644
index 0000000000..a51a564cbb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sparc/bits/environments.h
@@ -0,0 +1,87 @@
+/* Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _UNISTD_H
+# error "Never include this file directly.  Use <unistd.h> instead"
+#endif
+
+#include <bits/wordsize.h>
+
+/* This header should define the following symbols under the described
+   situations.  A value `1' means that the model is always supported,
+   `-1' means it is never supported.  Undefined means it cannot be
+   statically decided.
+
+   _POSIX_V6_ILP32_OFF32   32bit int, long, pointers, and off_t type
+   _POSIX_V6_ILP32_OFFBIG  32bit int, long, and pointers and larger off_t type
+
+   _POSIX_V6_LP64_OFF32	   64bit long and pointers and 32bit off_t type
+   _POSIX_V6_LPBIG_OFFBIG  64bit long and pointers and large off_t type
+
+   The macros _XBS5_ILP32_OFF32, _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and
+   _XBS5_LPBIG_OFFBIG were used in previous versions of the Unix standard
+   and are available only for compatibility.
+*/
+
+#if __WORDSIZE == 64
+
+/* Environments with 32-bit wide pointers are optionally provided.
+   Therefore following macros aren't defined:
+   # undef _POSIX_V6_ILP32_OFF32
+   # undef _POSIX_V6_ILP32_OFFBIG
+   # undef _XBS5_ILP32_OFF32
+   # undef _XBS5_ILP32_OFFBIG
+   and users need to check at runtime.  */
+
+/* We also have no use (for now) for an environment with bigger pointers
+   and offsets.  */
+# define _POSIX_V6_LPBIG_OFFBIG	-1
+# define _XBS5_LPBIG_OFFBIG	-1
+
+/* By default we have 64-bit wide `long int', pointers and `off_t'.  */
+# define _POSIX_V6_LP64_OFF64	1
+# define _XBS5_LP64_OFF64	1
+
+#else /* __WORDSIZE == 32 */
+
+/* By default we have 32-bit wide `int', `long int', pointers and `off_t'
+   and all platforms support LFS.  */
+# define _POSIX_V6_ILP32_OFF32	1
+# define _POSIX_V6_ILP32_OFFBIG	1
+# define _XBS5_ILP32_OFF32	1
+# define _XBS5_ILP32_OFFBIG	1
+
+/* We optionally provide an environment with the above size but an 64-bit
+   side `off_t'.  Therefore we don't define _XBS5_ILP32_OFFBIG.  */
+
+/* Environments with 64-bit wide pointers can be provided,
+   so these macros aren't defined:
+   # undef _POSIX_V6_LP64_OFF64
+   # undef _POSIX_V6_LPBIG_OFFBIG
+   # undef _XBS5_LP64_OFF64
+   # undef _XBS5_LPBIG_OFFBIG
+   and sysconf tests for it at runtime.  */
+
+#endif /* __WORDSIZE == 32 */
+
+#define __ILP32_OFF32_CFLAGS	"-m32"
+#define __ILP32_OFFBIG_CFLAGS	"-m32 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
+#define __ILP32_OFF32_LDFLAGS	"-m32"
+#define __ILP32_OFFBIG_LDFLAGS	"-m32"
+#define __LP64_OFF64_CFLAGS	"-m64"
+#define __LP64_OFF64_LDFLAGS	"-m64"
diff --git a/sysdeps/unix/sysv/linux/x86_64/bits/environments.h b/sysdeps/unix/sysv/linux/x86_64/bits/environments.h
new file mode 100644
index 0000000000..a51a564cbb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/bits/environments.h
@@ -0,0 +1,87 @@
+/* Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _UNISTD_H
+# error "Never include this file directly.  Use <unistd.h> instead"
+#endif
+
+#include <bits/wordsize.h>
+
+/* This header should define the following symbols under the described
+   situations.  A value `1' means that the model is always supported,
+   `-1' means it is never supported.  Undefined means it cannot be
+   statically decided.
+
+   _POSIX_V6_ILP32_OFF32   32bit int, long, pointers, and off_t type
+   _POSIX_V6_ILP32_OFFBIG  32bit int, long, and pointers and larger off_t type
+
+   _POSIX_V6_LP64_OFF32	   64bit long and pointers and 32bit off_t type
+   _POSIX_V6_LPBIG_OFFBIG  64bit long and pointers and large off_t type
+
+   The macros _XBS5_ILP32_OFF32, _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and
+   _XBS5_LPBIG_OFFBIG were used in previous versions of the Unix standard
+   and are available only for compatibility.
+*/
+
+#if __WORDSIZE == 64
+
+/* Environments with 32-bit wide pointers are optionally provided.
+   Therefore following macros aren't defined:
+   # undef _POSIX_V6_ILP32_OFF32
+   # undef _POSIX_V6_ILP32_OFFBIG
+   # undef _XBS5_ILP32_OFF32
+   # undef _XBS5_ILP32_OFFBIG
+   and users need to check at runtime.  */
+
+/* We also have no use (for now) for an environment with bigger pointers
+   and offsets.  */
+# define _POSIX_V6_LPBIG_OFFBIG	-1
+# define _XBS5_LPBIG_OFFBIG	-1
+
+/* By default we have 64-bit wide `long int', pointers and `off_t'.  */
+# define _POSIX_V6_LP64_OFF64	1
+# define _XBS5_LP64_OFF64	1
+
+#else /* __WORDSIZE == 32 */
+
+/* By default we have 32-bit wide `int', `long int', pointers and `off_t'
+   and all platforms support LFS.  */
+# define _POSIX_V6_ILP32_OFF32	1
+# define _POSIX_V6_ILP32_OFFBIG	1
+# define _XBS5_ILP32_OFF32	1
+# define _XBS5_ILP32_OFFBIG	1
+
+/* We optionally provide an environment with the above size but an 64-bit
+   side `off_t'.  Therefore we don't define _XBS5_ILP32_OFFBIG.  */
+
+/* Environments with 64-bit wide pointers can be provided,
+   so these macros aren't defined:
+   # undef _POSIX_V6_LP64_OFF64
+   # undef _POSIX_V6_LPBIG_OFFBIG
+   # undef _XBS5_LP64_OFF64
+   # undef _XBS5_LPBIG_OFFBIG
+   and sysconf tests for it at runtime.  */
+
+#endif /* __WORDSIZE == 32 */
+
+#define __ILP32_OFF32_CFLAGS	"-m32"
+#define __ILP32_OFFBIG_CFLAGS	"-m32 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
+#define __ILP32_OFF32_LDFLAGS	"-m32"
+#define __ILP32_OFFBIG_LDFLAGS	"-m32"
+#define __LP64_OFF64_CFLAGS	"-m64"
+#define __LP64_OFF64_LDFLAGS	"-m64"