From: Salvador E. Tropea <salvador@inti.gob.ar>
Date: Thu, 13 Oct 2016 20:51:14 +0000 (-0300)
Subject: Allow to overwrite ABCEXTERNAL from the environment.
X-Git-Tag: yosys-0.7~33^2^2~1
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cc8f29a1e60030dc81099c40a99a1f8731bbf114;p=yosys.git

Allow to overwrite ABCEXTERNAL from the environment.
In this way Debian scripts can define it as berkeley-abc from the shell.
---

diff --git a/Makefile b/Makefile
index 4534d619e..9f16a4fb7 100644
--- a/Makefile
+++ b/Makefile
@@ -90,7 +90,7 @@ ABCMKARGS = CC="$(CXX)" CXX="$(CXX)"
 
 # set ABCEXTERNAL = <abc-command> to use an external ABC instance
 # Note: The in-tree ABC (yosys-abc) will not be installed when ABCEXTERNAL is set.
-ABCEXTERNAL =
+ABCEXTERNAL ?=
 
 define newline