From 699e1881107f952c41800dcfed128be38fc27cf9 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Mon, 26 Aug 2013 23:03:39 +1000
Subject: [PATCH] build: only use a build in $SKETCHBOOK for px4

for others it is more convenient to use /tmp, as quite a few scripts
rely on this
---
 mk/environ.mk | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mk/environ.mk b/mk/environ.mk
index 452a0acd54..06c22f57e1 100644
--- a/mk/environ.mk
+++ b/mk/environ.mk
@@ -64,7 +64,15 @@ endif
 # Work out where we are going to be building things
 #
 TMPDIR			?=	/tmp
+
+ifneq ($(findstring px4, $(MAKECMDGOALS)),)
+# when building px4 we need all sources to be inside the sketchbook directory
+# as the NuttX build system relies on it
 BUILDROOT		:=	$(SKETCHBOOK)/Build.$(SKETCH)
+else
+BUILDROOT		:=	$(abspath $(TMPDIR)/$(SKETCH).build)
+endif
+
 ifneq ($(findstring CYGWIN, $(SYSTYPE)),)
   # Workaround a $(abspath ) bug on cygwin
   ifeq ($(BUILDROOT),)