Makefile: do not recompile main programs when libraries have changed.

diff --git a/merge-index.c b/merge-index.c
index 024196e7ac53cb9ad09b38ea646bad81aff33306..190e12fb7ceeb012a063f8c97b574e9650d95cc1 100644 (file)
--- a/merge-index.c
+++ b/merge-index.c
@@ -99,6 +99,11 @@ int main(int argc, char **argv)
 {
        int i, force_file = 0;
 
+       /* Without this we cannot rely on waitpid() to tell
+        * what happened to our children.
+        */
+       signal(SIGCHLD, SIG_DFL);
+
        if (argc < 3)
                usage("git-merge-index [-o] [-q] <merge-program> (-a | <filename>*)");