From 0bf5c27b64d650042d08ab4162307dce265c62bf Mon Sep 17 00:00:00 2001
From: Marvin Scholz <epirat07@gmail.com>
Date: Thu, 4 Jul 2019 22:05:42 +0200
Subject: [PATCH] env: Do not return empty tool env vars

A compiler or other tool with an empty string as name does not make
sense as it anyway can not be used and causes a failure later in
parse_entry.

Fix #5451
---
 mesonbuild/envconfig.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mesonbuild/envconfig.py b/mesonbuild/envconfig.py
index 03c6346a5..cec50599e 100644
--- a/mesonbuild/envconfig.py
+++ b/mesonbuild/envconfig.py
@@ -340,6 +340,10 @@ This is probably wrong, it should always point to the native compiler.''' % evar
             command = os.environ.get(evar)
             if command is not None:
                 command = shlex.split(command)
+
+        # Do not return empty string entries
+        if command is not None and len(command) == 0:
+            return None
         return command
 
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