From: erg <devnull@localhost>
Date: Thu, 24 Apr 2008 14:51:15 +0000 (+0000)
Subject: Ensure that a graph is output when -c is used, even if the graph is empty.
X-Git-Tag: LAST_LIBGRAPH~32^2~4215
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=33048db276210b240c4f091ca1387d68fc681f59;p=graphviz

Ensure that a graph is output when -c is used, even if the graph is empty.
---

diff --git a/cmd/gvpr/gvpr.c b/cmd/gvpr/gvpr.c
index 1421ece4f..4628628bb 100644
--- a/cmd/gvpr/gvpr.c
+++ b/cmd/gvpr/gvpr.c
@@ -702,9 +702,13 @@ int main(int argc, char *argv[])
 		(state->target) && !agnnodes(state->target))
 		agdelete(state->curgraph, state->target);
 
-	    /* output graph, if necessary */
-	    if (state->outgraph && agnnodes(state->outgraph))
-		agwrite(state->outgraph, options.outFile);
+	    /* output graph, if necessary
+             * For this, the outgraph must be defined, and either
+             * be non-empty or the -c option was used.
+             */
+	    if (state->outgraph && 
+		(agnnodes(state->outgraph) || (options.compflags & SRCOUT)))
+		    agwrite(state->outgraph, options.outFile);
 
 	    chkClose(state->curgraph);
 	    state->target = 0;