From 16d8a62b17ae8a3e026d192574a05bdb87140c59 Mon Sep 17 00:00:00 2001
From: Daniel <dmoody256@gmail.com>
Date: Wed, 20 Feb 2019 00:16:11 -0600
Subject: add win_flex as option for windows, add choco default path, and add
 flag for nounistd on windows. also more testing

---
 src/engine/SCons/Tool/lex.py  | 26 ++++++++++++++++----------
 src/engine/SCons/Tool/lex.xml |  9 +++++++++
 2 files changed, 25 insertions(+), 10 deletions(-)

(limited to 'src/engine/SCons/Tool')

diff --git a/src/engine/SCons/Tool/lex.py b/src/engine/SCons/Tool/lex.py
index 70c0c5f3f..3506f7c12 100644
--- a/src/engine/SCons/Tool/lex.py
+++ b/src/engine/SCons/Tool/lex.py
@@ -41,6 +41,7 @@ import SCons.Tool
 import SCons.Util
 from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
 from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
+from SCons.Platform.win32 import CHOCO_DEFAULT_PATH
 
 LexAction = SCons.Action.Action("$LEXCOM", "$LEXCOMSTR")
 
@@ -74,17 +75,19 @@ def get_lex_path(env, append_paths=False):
     """
     # save existing path to reset if we don't want to append any paths
     envPath = env['ENV']['PATH']
-    bins = ['lex', 'flex']
+    bins = ['win_flex', 'lex', 'flex']
 
     for prog in bins:
-        bin_path = SCons.Tool.find_program_path(env, prog, default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
+        bin_path = SCons.Tool.find_program_path(
+            env, 
+            prog, 
+            default_paths=CHOCO_DEFAULT_PATH + MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS )
         if bin_path:
             if not append_paths:
                 env['ENV']['PATH'] = envPath
             else:
                 env.AppendENVPath('PATH', os.path.dirname(bin_path))
             return bin_path
-
     SCons.Warnings.Warning('lex tool requested, but lex or flex binary not found in ENV PATH')
 
 
@@ -92,9 +95,6 @@ def generate(env):
     """Add Builders and construction variables for lex to an Environment."""
     c_file, cxx_file = SCons.Tool.createCFileBuilders(env)
 
-    if sys.platform == 'win32':
-        get_lex_path(env, append_paths=True)
-
     # C
     c_file.add_action(".l", LexAction)
     c_file.add_emitter(".l", lexEmitter)
@@ -109,10 +109,16 @@ def generate(env):
     # C++
     cxx_file.add_action(".ll", LexAction)
     cxx_file.add_emitter(".ll", lexEmitter)
-    
-    env["LEX"] = env.Detect("flex") or "lex"
-    env["LEXFLAGS"] = SCons.Util.CLVar("")
-    env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
+
+    if sys.platform == 'win32':
+        get_lex_path(env, append_paths=True)
+        env["LEX"] = env.Detect(['win_flex', 'lex', 'flex'])
+        env["LEXUNISTD"] = SCons.Util.CLVar("--nounistd")
+        env["LEXCOM"] = "$LEX $LEXUNISTD $LEXFLAGS -t $SOURCES > $TARGET"
+    else:
+        env["LEX"] = env.Detect(["flex", "lex"])
+        env["LEXFLAGS"] = SCons.Util.CLVar("")
+        env["LEXCOM"] = "$LEX $LEXFLAGS -t $SOURCES > $TARGET"
 
 def exists(env):
     if sys.platform == 'win32':
diff --git a/src/engine/SCons/Tool/lex.xml b/src/engine/SCons/Tool/lex.xml
index 0388ee355..f933451e5 100644
--- a/src/engine/SCons/Tool/lex.xml
+++ b/src/engine/SCons/Tool/lex.xml
@@ -33,6 +33,7 @@ Sets construction variables for the &lex; lexical analyser.
 <item>LEX</item>
 <item>LEXFLAGS</item>
 <item>LEXCOM</item>
+<item>LEXUNISTD</item>
 </sets>
 <uses>
 <item>LEXCOMSTR</item>
@@ -78,4 +79,12 @@ General options passed to the lexical analyzer generator.
 </summary>
 </cvar>
 
+<cvar name="LEXUNISTD">
+<summary>
+<para>
+Used only on windows environments to set a lex flag to prevent 'unistd.h' from being included. The default value is '--nounistd'.
+</para>
+</summary>
+</cvar>
+
 </sconsdoc>
-- 
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