[patch] Building simulators on windows hosts

[Paul Brook <paul@codesourcery.com>]

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The attached patch allows building the gdb simulators on windows hosts. These 
do not provide the lstat(2) or ftruncate(2) functions. truncate(2) is not 
implemented in older mingw releases.

Windows doesn't have symbolic links, so we use stat in place of lstat. For the 
missing truncate functions we just fail.

Applied to csl-arm-20050325-branch.
Ok for mainline?

Paul

2005-04-29  Paul Brook  <paul@codesourcery.com>

	* common/callback.c (PIPE_BUF): Provide default refinition.
	(os_lstat): Use stat if lstat is not available on the host.
	(os_ftruncate): Return EINVAL if not available on the host.
	(os_truncate): Ditto.
	* common/configure.ac: Check for lstat, truncate and ftruncate.
	* common/configure: Regenerate.
	* common/config.in: Regenerate.

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Index: sim/common/callback.c
===================================================================
RCS file: /var/cvsroot/src-cvs/src/sim/common/callback.c,v
retrieving revision 1.16
diff -u -p -r1.16 callback.c
--- sim/common/callback.c	21 Feb 2005 21:59:54 -0000	1.16
+++ sim/common/callback.c	28 Apr 2005 15:01:39 -0000
@@ -60,6 +60,10 @@
 #include <unistd.h>
 #endif
 
+#ifndef PIPE_BUF
+#define PIPE_BUF 512
+#endif
+
 /* ??? sim_cb_printf should be cb_printf, but until the callback support is
    broken out of the simulator directory, these are here to not require
    sim-utils.h.  */
@@ -577,7 +581,11 @@ os_lstat (p, file, buf)
      struct stat *buf;
 {
   /* NOTE: hpn/2004-12-12: Same issue here as with os_fstat.  */
+#ifdef HAVE_LSTAT
   return wrap (p, lstat (file, buf));
+#else
+  return wrap (p, stat (file, buf));
+#endif
 }
 
 static int 
@@ -596,7 +604,12 @@ os_ftruncate (p, fd, len)
     }
   if (result)
     return result;
+#ifdef HAVE_FTRUNCATE
   result = wrap (p, ftruncate (fdmap (p, fd), len));
+#else
+  p->last_errno = EINVAL;
+  result = -1;
+#endif
   return result;
 }
 
@@ -606,7 +619,12 @@ os_truncate (p, file, len)
      const char *file;
      long len;
 {
+#ifdef HAVE_TRUNCATE
   return wrap (p, truncate (file, len));
+#else
+  p->last_errno = EINVAL;
+  return -1;
+#endif
 }
 
 static int
Index: sim/common/configure.ac
===================================================================
RCS file: /var/cvsroot/src-cvs/src/sim/common/configure.ac,v
retrieving revision 1.2
diff -u -p -r1.2 configure.ac
--- sim/common/configure.ac	14 Jan 2005 20:05:40 -0000	1.2
+++ sim/common/configure.ac	28 Apr 2005 15:02:29 -0000
@@ -37,7 +37,7 @@ AC_SUBST(TARGET_SUBDIR)
 
 # These aren't all needed yet, but will be eventually.
 AC_CHECK_HEADERS(stdlib.h string.h strings.h time.h sys/times.h sys/stat.h sys/mman.h)
-AC_CHECK_FUNCS(mmap munmap)
+AC_CHECK_FUNCS(mmap munmap lstat truncate ftruncate)
 SIM_CHECK_MEMBERS([[struct stat.st_dev], [struct stat.st_ino],
 [struct stat.st_mode], [struct stat.st_nlink], [struct stat.st_uid],
 [struct stat.st_gid], [struct stat.st_rdev], [struct stat.st_size],