[Patch] Don't provide lstat gfortran intrinsic if target doesn't support lstat.

[Danny Smith]

> From: FX Coudert
> Sent: Monday, 23 October 2006 12:27 a.m.
> 
> 
> > Sure that could be done.  However, I think it is simpler 
> just to test 
> > for existence of of lstat without presuming that "LSTAT is formally
> > the
> > same as STAT" on windows.  gfortran should not be making such  
> > decisions
> > for any target.

FX wrote: 
> I know that it's easier to test for the existence of lstat, and if  
> lstat is not available, make the libgfortran LSTAT internally call  
> stat instead.
> 
> FX
> 

OK, This is what g77 used to do and is what signal intrinsic still does:
keep the fortran intrinsic but set errno to ENOSYS and return an invalid
value 
if function is not supported.

2006-10-22  Danny Smith  <dannysmith@users.sourceforge.net>

	* configure.ac: Test for lstat.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* instrinsics/stat.c: Set errno to ENOSYS when lstat intrinsic
	called on target with no lstat support.
 

Index: configure.ac
===================================================================
--- configure.ac	(revision 117900)
+++ configure.ac	(working copy)
@@ -172,7 +172,7 @@
 AC_CHECK_FUNCS(getrusage times mkstemp strtof strtold snprintf
ftruncate chsize)
 AC_CHECK_FUNCS(chdir strerror getlogin gethostname kill link symlink
perror)
 AC_CHECK_FUNCS(sleep time ttyname signal alarm ctime clock access fork
execl)
-AC_CHECK_FUNCS(wait setmode)
+AC_CHECK_FUNCS(wait setmode lstat)
 
 # Check for types
 AC_CHECK_TYPES([intptr_t])
Index: intrinsics/stat.c
===================================================================
--- intrinsics/stat.c	(revision 117900)
+++ intrinsics/stat.c	(working copy)
@@ -89,7 +89,14 @@
   str[name_len] = '\0';
 
   if (is_lstat)
+#ifdef HAVE_LSTAT
     val = lstat(str, &sb);
+#else
+      {
+	val = -1;
+	errno = ENOSYS;
+      }
+#endif
   else
     val = stat(str, &sb);
 
@@ -178,7 +185,6 @@
 iexport(lstat_i4_sub);
 
 
-
 static void
 stat_i8_sub_0 (char *name, gfc_array_i8 *sarray, GFC_INTEGER_8 *status,
 	       gfc_charlen_type name_len, int is_lstat)
@@ -205,7 +211,14 @@
   str[name_len] = '\0';
 
   if (is_lstat)
+#ifdef HAVE_LSTAT
     val = lstat(str, &sb);
+#else
+      {
+	val = -1;
+	errno = ENOSYS;
+      }
+#endif
   else
     val = stat(str, &sb);