X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fftruncate.m4;h=ec593a96de068eda24748dc44e8e868b3ee65547;hb=10d07d3dae308f7bcfb60f319ccbb2f3ff9f1275;hp=bcb4ba1ed9f0bad99c3fef466c201a0273902e39;hpb=19ed461a6c9d44f93a1cb74bf10c8d2eb0f4e704;p=gnulib.git

diff --git a/m4/ftruncate.m4 b/m4/ftruncate.m4
index bcb4ba1ed..ec593a96d 100644
--- a/m4/ftruncate.m4
+++ b/m4/ftruncate.m4
@@ -1,27 +1,18 @@
-#serial 1
+#serial 5
 
-# See if we need to emulate a missing ftruncate function using fcntl.
+# See if we need to emulate a missing ftruncate function using fcntl or chsize.
 
-AC_DEFUN(jm_FUNC_FTRUNCATE,
+AC_DEFUN([jm_FUNC_FTRUNCATE],
 [
-  AC_CHECK_FUNCS(ftruncate, , [ftruncate_missing=yes])
-
-  if test "$ftruncate_missing" = yes; then
-    AC_CHECK_HEADERS(unistd.h)
-    AC_MSG_CHECKING([fcntl emulation of ftruncate])
-    AC_CACHE_VAL(fu_cv_sys_ftruncate_emulation,
-    [AC_TRY_LINK([
-#include <sys/types.h>
-#include <fcntl.h>], [
-#if !defined(F_CHSIZE) && !defined(F_FREESP)
-  chsize();
-#endif
-  ],
-      fu_cv_sys_ftruncate_emulation=yes,
-      fu_cv_sys_ftruncate_emulation=no)])
-    AC_MSG_RESULT($fu_cv_sys_ftruncate_emulation)
-    if test $fu_cv_sys_ftruncate_emulation = yes; then
-      LIBOBJS="$LIBOBJS ftruncate.$ac_objext"
-    fi
+  AC_REPLACE_FUNCS(ftruncate)
+  if test $ac_cv_func_ftruncate = no; then
+    gl_PREREQ_FTRUNCATE
   fi
 ])
+
+# Prerequisites of lib/ftruncate.c.
+AC_DEFUN([gl_PREREQ_FTRUNCATE],
+[
+  AC_CHECK_HEADERS_ONCE(unistd.h)
+  AC_CHECK_FUNCS(chsize)
+])