From 01855a5acd8bea448b5cd83d61fa9a7ebbf1815e Mon Sep 17 00:00:00 2001
From: Christian Mauderer <christian.mauderer@embedded-brains.de>
Date: Mon, 7 May 2018 10:19:28 +0200
Subject: waf: Allow to only generate lex and yacc.

In some applications, it's usefull if the files generated by lex or yacc
are not build automatically. With that it is for example possible to
create a wrapper source file that sets some defines before the generated
code is parsed.
---
 builder.py    | 12 ++++++++----
 waf_libbsd.py | 26 ++++++++++++++------------
 2 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/builder.py b/builder.py
index b0d6374e..78f592c7 100755
--- a/builder.py
+++ b/builder.py
@@ -547,15 +547,17 @@ class RouteKeywordsFragmentComposer(BuildSystemFragmentComposer):
 
 class LexFragmentComposer(BuildSystemFragmentComposer):
 
-    def __init__(self, sym, dep, cflags = None, includes = None):
+    def __init__(self, sym, dep, cflags = None, includes = None, build = True):
         self.sym = sym
         self.dep = dep
         self.cflags, self.includes = _cflagsIncludes(cflags, includes)
+        self.build = build
 
     def compose(self, path):
         d = { 'file': path,
               'sym': self.sym,
-              'dep': self.dep }
+              'dep': self.dep,
+              'build': self.build }
         if None not in self.cflags:
             d['cflags'] = self.cflags
         if None not in self.includes:
@@ -564,15 +566,17 @@ class LexFragmentComposer(BuildSystemFragmentComposer):
 
 class YaccFragmentComposer(BuildSystemFragmentComposer):
 
-    def __init__(self, sym, header, cflags = None, includes = None):
+    def __init__(self, sym, header, cflags = None, includes = None, build = True):
         self.sym = sym
         self.header = header
         self.cflags, self.includes = _cflagsIncludes(cflags, includes)
+        self.build = build
 
     def compose(self, path):
         d = { 'file': path,
               'sym': self.sym,
-              'header': self.header }
+              'header': self.header,
+              'build': self.build }
         if None not in self.cflags:
             d['cflags'] = self.cflags
         if None not in self.includes:
diff --git a/waf_libbsd.py b/waf_libbsd.py
index bbc8b42c..597e882e 100644
--- a/waf_libbsd.py
+++ b/waf_libbsd.py
@@ -361,12 +361,13 @@ class Builder(builder.ModuleManager):
                     bld(target = lex['file'][:-2]+ '.c',
                         source = lex['file'],
                         rule = lex_rule)
-                bld.objects(target = 'lex_%s' % (lex['sym']),
-                            features = 'c',
-                            cflags = cflags,
-                            includes = lexIncludes + includes,
-                            defines = defines + lexDefines,
-                            source = lex['file'][:-2] + '.c')
+                if lex['build']:
+                    bld.objects(target = 'lex_%s' % (lex['sym']),
+                                features = 'c',
+                                cflags = cflags,
+                                includes = lexIncludes + includes,
+                                defines = defines + lexDefines,
+                                source = lex['file'][:-2] + '.c')
                 libbsd_use += ['lex_%s' % (lex['sym'])]
 
         #
@@ -398,12 +399,13 @@ class Builder(builder.ModuleManager):
                     bld(target = yaccFile[:-2] + '.c',
                         source = yaccFile,
                         rule = yacc_rule)
-                bld.objects(target = 'yacc_%s' % (yaccSym),
-                            features = 'c',
-                            cflags = cflags,
-                            includes = yaccIncludes + includes,
-                            defines = defines + yaccDefines,
-                            source = yaccFile[:-2] + '.c')
+                if yacc['build']:
+                    bld.objects(target = 'yacc_%s' % (yaccSym),
+                                features = 'c',
+                                cflags = cflags,
+                                includes = yaccIncludes + includes,
+                                defines = defines + yaccDefines,
+                                source = yaccFile[:-2] + '.c')
                 libbsd_use += ['yacc_%s' % (yaccSym)]
 
         #
-- 
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