p4merge does not properly handle the case where "/dev/null"
is passed as a filename.

Workaround it by creating a temporary file for this purpose.

Reported-by: Jeremy Morton <ad...@game-point.net>
Signed-off-by: David Aguilar <dav...@gmail.com>
---
Jeremy, can you test this?

 mergetools/p4merge | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/mergetools/p4merge b/mergetools/p4merge
index 1a45c1b..295361a 100644
--- a/mergetools/p4merge
+++ b/mergetools/p4merge
@@ -1,5 +1,30 @@
 diff_cmd () {
+       # p4merge does not like /dev/null
+       rm_local=
+       rm_remote=
+       if test "/dev/null" = "$LOCAL"
+       then
+               LOCAL="./p4merge-dev-null.LOCAL.$$"
+               >"$LOCAL"
+               rm_local=true
+       fi
+       if test "/dev/null" = "$REMOTE"
+       then
+               REMOTE="./p4merge-dev-null.REMOTE.$$"
+               >"$REMOTE"
+               rm_remote=true
+       fi
+
        "$merge_tool_path" "$LOCAL" "$REMOTE"
+
+       if test -n "$rm_local"
+       then
+               rm -f "$LOCAL"
+       fi
+       if test -n "$rm_remote"
+       then
+               rm -f "$REMOTE"
+       fi
 }
 
 merge_cmd () {
-- 
1.8.0.rc1

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