From 82bf497dd03f97f66f0026d9fea51b24af0af67b Mon Sep 17 00:00:00 2001
From: Steven Knight <knight@baldmt.com>
Date: Sun, 13 Oct 2002 12:52:05 +0000
Subject: Make undeclared options be ignored. (Anthony Roach)

---
 src/engine/SCons/Options.py      | 17 +++++++++++++----
 src/engine/SCons/OptionsTests.py |  2 ++
 test/Options.py                  | 26 ++++++++++++++++++++++++++
 3 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/src/engine/SCons/Options.py b/src/engine/SCons/Options.py
index becee14..7e70118 100644
--- a/src/engine/SCons/Options.py
+++ b/src/engine/SCons/Options.py
@@ -93,8 +93,13 @@ class Options:
         values.update(args)
 
         # put the variables in the environment:
-        for key in values.keys():
-            env[key] = values[key]
+        # (don't copy over variables that are not declared
+        #  as options)
+        for option in self.options:
+            try:
+                env[option.key] = values[option.key]
+            except KeyError:
+                pass
 
         # Call the convert functions:
         for option in self.options:
@@ -103,7 +108,7 @@ class Options:
                 try:
                     env[option.key] = option.converter(value)
                 except ValueError, x:
-                    raise SCons.Errors.UserError, 'Error converting option: %s\n%s'%(options.key, x)
+                    raise SCons.Errors.UserError, 'Error converting option: %s\n%s'%(option.key, x)
 
 
         # Finally validate the values:
@@ -122,7 +127,11 @@ class Options:
         help_text = ""
 
         for option in self.options:
-            help_text = help_text + '\n%s: %s\n    default: %s\n    actual: %s\n'%(option.key, option.help, option.default, env.subst('${%s}'%option.key))
+            help_text = help_text + '\n%s: %s\n    default: %s\n'%(option.key, option.help, option.default)
+            if env.has_key(option.key):
+                help_text = help_text + '    actual: %s\n'%env.subst('${%s}'%option.key)
+            else:
+                help_text = help_text + '    actual: None\n'
 
         return help_text
 
diff --git a/src/engine/SCons/OptionsTests.py b/src/engine/SCons/OptionsTests.py
index ec9e42f..730c87d 100644
--- a/src/engine/SCons/OptionsTests.py
+++ b/src/engine/SCons/OptionsTests.py
@@ -38,6 +38,8 @@ class Environment:
         self.dict[key] = value
     def __getitem__(self, key):
         return self.dict[key]
+    def has_key(self, key):
+        return self.dict.has_key(key)
 
 
 def check(key,value):
diff --git a/test/Options.py b/test/Options.py
index b431d88..2ecdd57 100644
--- a/test/Options.py
+++ b/test/Options.py
@@ -55,6 +55,9 @@ opts.Add('DEBUG_BUILD',
 opts.Add('CC',
          'The C compiler')
 
+opts.Add('UNSPECIFIED',
+         'An option with no value')
+
 def test_tool(env, platform):
     if env['RELEASE_BUILD']:
         env['CCFLAGS'] = env['CCFLAGS'] + ' -O'
@@ -71,6 +74,19 @@ print env['DEBUG_BUILD']
 print env['CC']
 print env['CCFLAGS']
 
+# unspecified options should not be set:
+assert not env.has_key('UNSPECIFIED')
+
+# undeclared options should be ignored:
+assert not env.has_key('UNDECLARED')
+
+# calling Update() should not effect options that
+# are not declared on the options object:
+r = env['RELEASE_BUILD']
+opts = Options()
+opts.Update(env)
+assert env['RELEASE_BUILD'] == r
+
 Default(env.Alias('dummy'))
         
 """)
@@ -91,6 +107,12 @@ check(['1', '0', cc, ccflags + ' -O'])
 test.run(arguments='"CC=not_a_c_compiler"')
 check(['0', '1', 'not_a_c_compiler', ccflags + ' -g'])
 
+test.run(arguments='"UNDECLARED=foo"')
+check(['0', '1', cc, ccflags + ' -g'])
+
+test.run(arguments='"CCFLAGS=--taco"')
+check(['0', '1', cc, ccflags + ' -g'])
+
 test.write('custom.py', """
 DEBUG_BUILD=0
 RELEASE_BUILD=1
@@ -119,6 +141,10 @@ CC: The C compiler
     default: None
     actual: %s
 
+UNSPECIFIED: An option with no value
+    default: None
+    actual: None
+
 Use scons -H for help about command-line options.
 """%cc)
 
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