(generate_makefile): Detect write/close failure.

diff --git a/automake.in b/automake.in
index 5f666c1..da265cf 100755 (executable)
--- a/automake.in
+++ b/automake.in
@@ -687,7 +687,12 @@ sub generate_makefile
     print GM_FILE $output_rules;
     print GM_FILE $output_trailer;
 
-    close (GM_FILE);
+    if (! close (GM_FILE))
+      {
+       warn "automake: $am_file.in: cannot close: $!\n";
+       $exit_status = 1;
+       return;
+      }
 }
 
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