configure.ac: Check for ftruncate and chsize.

	* configure.ac: Check for ftruncate and chsize.
	* io/unix.c (fd_truncate): Provide chsize as alternative to
	ftruncate.
	* config.h.in: Regenerate.
	* configure: Regenerate.

From-SVN: r98989

libgfortran/ChangeLog

+2005-04-29  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
+
+	* configure.ac: Check for ftruncate and chsize.
+	* io/unix.c (fd_truncate): Provide chsize as alternative to
+	ftruncate.
+	* config.h.in: Regenerate.
+	* configure: Regenerate.
+
 2004-04-29  Tobias Schl"uter  <tobias.schlueter@physik.uni-muenchen.de>
 
 	* intrinsics/rename.c: Add missing #includes.

libgfortran/config.h.in

@@ -30,6 +30,9 @@
 /* Define to 1 if you have the `chdir' function. */
 #undef HAVE_CHDIR
 
+/* Define to 1 if you have the `chsize' function. */
+#undef HAVE_CHSIZE
+
 /* complex.h exists */
 #undef HAVE_COMPLEX_H
 
@@ -69,6 +72,9 @@
 /* libm includes frexpf */
 #undef HAVE_FREXPF
 
+/* Define to 1 if you have the `ftruncate' function. */
+#undef HAVE_FTRUNCATE
+
 /* libc includes getgid */
 #undef HAVE_GETGID
 

libgfortran/configure.ac

@@ -166,7 +166,7 @@ AC_CHECK_MEMBERS([struct stat.st_rdev])
 AC_CHECK_LIB([m],[csin],[need_math="no"],[need_math="yes"])
 
 # Check for library functions.
-AC_CHECK_FUNCS(getrusage times mkstemp strtof snprintf)
+AC_CHECK_FUNCS(getrusage times mkstemp strtof snprintf ftruncate chsize)
 AC_CHECK_FUNCS(chdir strerror getlogin gethostname kill link symlink perror)
 AC_CHECK_FUNCS(sleep time)
 

libgfortran/io/unix.c

@@ -513,8 +513,15 @@ fd_truncate (unix_stream * s)
   /* non-seekable files, like terminals and fifo's fail the lseek.
      the fd is a regular file at this point */
 
+#ifdef HAVE_FTRUNCATE
   if (ftruncate (s->fd, s->logical_offset))
     return FAILURE;
+#else
+#ifdef HAVE_CHSIZE
+  if (chsize (s->fd, s->logical_offset))
+    return FAILURE;
+#endif
+#endif
 
   s->physical_offset = s->file_length = s->logical_offset;