make sys/stat.h self-contained

[Bruno Haible]

This makes the generated sys/stat.h more self-contained (no need to include
<config.h> first, except for typedefs).

2007-05-01  Bruno Haible  <address@hidden>

        * lib/sys_stat_.h: Test HAVE_LSTAT, HAVE_DECL_MKDIR, HAVE_IO_H at
        configure time.
        * m4/sys_stat_h.m4 (gl_HEADER_SYS_STAT_H): Substitute HAVE_LSTAT,
        HAVE_DECL_MKDIR, HAVE_IO_H via AC_SUBST.
        * modules/sys_stat (Makefile.am): Substitute their values into
        sys/stat.h.

*** lib/sys_stat_.h     27 Apr 2007 18:17:05 -0000      1.1
--- lib/sys_stat_.h     1 May 2007 18:09:15 -0000
***************
*** 253,266 ****
  
  /* mingw does not support symlinks, therefore it does not have lstat.  But
     without links, stat does just fine.  */
! #if ! HAVE_LSTAT
  # define lstat stat
  #endif
  
  /* mingw's _mkdir() function has 1 argument, but we pass 2 arguments.
     Additionally, it declares _mkdir (and depending on compile flags, an
     alias mkdir), only in the nonstandard io.h.  */
! #if ! HAVE_DECL_MKDIR && HAVE_IO_H
  # include <io.h>
  
  static inline int
--- 253,266 ----
  
  /* mingw does not support symlinks, therefore it does not have lstat.  But
     without links, stat does just fine.  */
! #if ! @HAVE_LSTAT@
  # define lstat stat
  #endif
  
  /* mingw's _mkdir() function has 1 argument, but we pass 2 arguments.
     Additionally, it declares _mkdir (and depending on compile flags, an
     alias mkdir), only in the nonstandard io.h.  */
! #if ! @HAVE_DECL_MKDIR@ && @HAVE_IO_H@
  # include <io.h>
  
  static inline int
*** m4/sys_stat_h.m4    27 Oct 2006 20:46:43 -0000      1.6
--- m4/sys_stat_h.m4    1 May 2007 18:09:15 -0000
***************
*** 1,5 ****
! # sys_stat_h.m4 serial 4   -*- Autoconf -*-
! dnl Copyright (C) 2006 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
--- 1,5 ----
! # sys_stat_h.m4 serial 5   -*- Autoconf -*-
! dnl Copyright (C) 2006-2007 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
***************
*** 12,17 ****
--- 12,23 ----
    dnl Check for lstat.  Systems that lack it (mingw) also lack symlinks, so
    dnl stat is a good replacement.
    AC_CHECK_FUNCS_ONCE([lstat])
+   if test $ac_cv_func_lstat = yes; then
+     HAVE_LSTAT=1
+   else
+     HAVE_LSTAT=0
+   fi
+   AC_SUBST([HAVE_LSTAT])
  
    dnl Check for mkdir.  Mingw has _mkdir(name) in the nonstandard <io.h>
    dnl instead.
***************
*** 19,24 ****
--- 25,42 ----
      [],
      [AC_CHECK_HEADERS([io.h])],
      [#include <sys/stat.h>])
+   if test $ac_cv_have_decl_mkdir = yes; then
+     HAVE_DECL_MKDIR=1
+   else
+     HAVE_DECL_MKDIR=0
+   fi
+   AC_SUBST([HAVE_DECL_MKDIR])
+   if test "$ac_cv_header_io_h" = yes; then
+     HAVE_IO_H=1
+   else
+     HAVE_IO_H=0
+   fi
+   AC_SUBST([HAVE_IO_H])
    AC_REQUIRE([AC_C_INLINE])
  
    dnl Check for broken stat macros.
*** modules/sys_stat    27 Apr 2007 18:18:49 -0000      1.13
--- modules/sys_stat    1 May 2007 18:09:15 -0000
***************
*** 22,27 ****
--- 22,30 ----
        rm -f address@hidden $@
        { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
          sed -e 's|@''ABSOLUTE_SYS_STAT_H''@|$(ABSOLUTE_SYS_STAT_H)|g' \
+             -e 's|@''HAVE_IO_H''@|$(HAVE_IO_H)|g' \
+             -e 's|@''HAVE_LSTAT''@|$(HAVE_LSTAT)|g' \
+             -e 's|@''HAVE_DECL_MKDIR''@|$(HAVE_DECL_MKDIR)|g' \
              < $(srcdir)/sys_stat_.h; \
        } > address@hidden
        mv address@hidden $@