From d31b4725d27977c96b1ee51b26936e31c2178c40 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Mon, 29 May 2017 11:03:01 -0400
Subject: [PATCH] add LEXSUFFIX, YACCSUFFIX construction variables - close #31

---
 lib/rscons/builders/cfile.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/rscons/builders/cfile.rb b/lib/rscons/builders/cfile.rb
index b935337..e8c061f 100644
--- a/lib/rscons/builders/cfile.rb
+++ b/lib/rscons/builders/cfile.rb
@@ -18,9 +18,11 @@ module Rscons
           "YACC" => "bison",
           "YACC_FLAGS" => ["-d"],
           "YACC_CMD" => ["${YACC}", "${YACC_FLAGS}", "-o", "${_TARGET}", "${_SOURCES}"],
+          "YACCSUFFIX" => [".y", ".yy"],
           "LEX" => "flex",
           "LEX_FLAGS" => [],
           "LEX_CMD" => ["${LEX}", "${LEX_FLAGS}", "-o", "${_TARGET}", "${_SOURCES}"],
+          "LEXSUFFIX" => [".l", ".ll"],
         }
       end
 
@@ -41,9 +43,9 @@ module Rscons
         })
         cmd =
           case
-          when sources.first.end_with?(".l", ".ll")
+          when sources.first.end_with?(*env.expand_varref("${LEXSUFFIX}"))
             "LEX"
-          when sources.first.end_with?(".y", ".yy")
+          when sources.first.end_with?(*env.expand_varref("${YACCSUFFIX}"))
             "YACC"
           else
             raise "Unknown source file #{sources.first.inspect} for CFile builder"