autotest: use build path on faster filesystem

Tools/scripts/build_autotest.sh

@@ -118,6 +118,9 @@ killall -9 JSBSim || /bin/true
 # raise core limit
 ulimit -c 10000000
 
+# build in home dir, as on faster storage
+export BUILD_BINARIES_PATH=$HOME/build/tmp
+
 timelimit 32000 APM/Tools/autotest/autotest.py --timeout=30000 > buildlogs/autotest-output.txt 2>&1
 
 (cd buildlogs && cp -f *.txt *.flashlog *.tlog *.km[lz] *.gpx *.html *.png *.bin *.BIN *.elf "history/$hdate/")

Tools/scripts/build_binaries.py

@@ -680,7 +680,10 @@ is bob we will attempt to checkout bob-AVR'''
         origin_env_path = os.environ.get("PATH")
         os.environ["PATH"] = ':'.join([prefix_bin_dirpath, origin_env_path,
                                        "/bin", "/usr/bin"])
-        self.tmpdir = os.path.join(os.getcwd(), 'build.tmp.binaries')
+        if 'BUILD_BINARIES_PATH' in os.environ:
+            self.tmpdir = os.environ['BUILD_BINARIES_PATH']
+        else:
+            self.tmpdir = os.path.join(os.getcwd(), 'build.tmp.binaries')
         os.environ["TMPDIR"] = self.tmpdir
 
         print(self.tmpdir)