Improved 'fatal-signal' module.

[gnulib.git] / m4 / ftruncate.m4

diff --git a/m4/ftruncate.m4 b/m4/ftruncate.m4
index 0397a00..ec593a9 100644 (file)
--- a/m4/ftruncate.m4
+++ b/m4/ftruncate.m4
@@ -1,14 +1,18 @@
-#serial 4
+#serial 5
 
 # See if we need to emulate a missing ftruncate function using fcntl or chsize.
 
 AC_DEFUN([jm_FUNC_FTRUNCATE],
 [
-  AC_CHECK_FUNCS(ftruncate, , [ftruncate_missing=yes])
-
-  if test "$ftruncate_missing" = yes; then
-    AC_CHECK_HEADERS([unistd.h])
-    AC_CHECK_FUNCS([chsize])
-    AC_LIBOBJ(ftruncate)
+  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)
+])