scripts/Xspice: which: warn if executable is not found

Also handle None parameter case.

1 files changed, 3 insertions, 0 deletions

diff --git a/scripts/Xspice b/scripts/Xspice
index b8a7b78..fee2b0e 100755
--- a/scripts/Xspice
+++ b/scripts/Xspice
@@ -26,12 +26,15 @@ import signal
 from subprocess import Popen, PIPE
 
 def which(x):
+    if not x:
+        return x
     if os.path.exists(x):
         return x
     for p in os.environ['PATH'].split(':'):
         candidate = os.path.join(p, x)
         if os.path.exists(candidate):
             return candidate
+    print 'Warning: failed to find executable %s' % x
     return None
 
 if 'XSPICE_ENABLE_GDB' in os.environ: