Minor fixes - boost::wave whitespace issue and uninitialized variable (#840)

* Turn off Turn off whitespace insertion when using boost::wave.

* Fix  un-initialized members of ASTfunction_call.
Move all initialization into constructor so some compilers can error on regression.

Author: marsupial

src/liboslcomp/ast.cpp

@@ -1082,14 +1082,14 @@ ASTtype_constructor::childname (size_t i) const
 ASTfunction_call::ASTfunction_call (OSLCompilerImpl *comp, ustring name,
                                     ASTNode *args, FunctionSymbol *funcsym)
     : ASTNode (function_call_node, comp, 0, args), m_name(name),
+      m_sym(funcsym ? funcsym : comp->symtab().find (name)), // Look it up.
+      m_poly(funcsym),    // Default - resolved symbol or null
       m_argread(~1),      // Default - all args are read except the first
       m_argwrite(1),      // Default - first arg only is written by the op
       m_argtakesderivs(0) // Default - doesn't take derivs
 {
-    // If we weren't passed a function symbol directly, look it up.
-    m_sym = funcsym ? funcsym : comp->symtab().find (name);
     if (! m_sym) {
-        error ("function '%s' was not declared in this scope", name.c_str());
+        error ("function '%s' was not declared in this scope", name);
         // FIXME -- would be fun to troll through the symtab and try to
         // find the things that almost matched and offer suggestions.
         return;

src/liboslcomp/oslcomp.cpp

@@ -204,8 +204,10 @@ OSLCompilerImpl::preprocess_buffer (const std::string &buffer,
         context_type ctx (instring.begin(), instring.end(), filename.c_str());
 
         // Turn on support of variadic macros, e.g. #define FOO(...) __VA_ARGS__
+        // Turn off whitespace insertion.
         boost::wave::language_support lang = boost::wave::language_support (
-                ctx.get_language() | boost::wave::support_option_variadics);
+                (ctx.get_language() | boost::wave::support_option_variadics)
+                & ~boost::wave::language_support::support_option_insert_whitespace);
         ctx.set_language (lang);
 
         ctx.add_macro_definition (OIIO::Strutil::format("OSL_VERSION_MAJOR=%d",