Sun May 12 19:19:43 1996 Aaron Digulla <digulla@fh-konstanz.de>

* main.c: (main), variable.c Changed handling of ENV-vars. Make
	stores now the names of the variables only and reads their contents
	when they are accessed to reflect that these variables are really
	global (ie. they CAN change WHILE make runs !) This handling is
	made in lookup_variable()
	* variable.c: Handling of ENV variable happens inside lookup_variable()

variable.c

@@ -1,5 +1,5 @@
 /* Internals of variables for GNU Make.
-Copyright (C) 1988, 89, 90, 91, 92, 93, 94 Free Software Foundation, Inc.
+Copyright (C) 1988, 89, 90, 91, 92, 93, 94, 96 Free Software Foundation, Inc.
 This file is part of GNU Make.
 
 GNU Make is free software; you can redistribute it and/or modify
@@ -366,7 +366,7 @@ define_automatic_variables ()
 	   ? "" : remote_description);
   (void) define_variable ("MAKE_VERSION", 12, buf, o_default, 0);
 
-  
+
   /* This won't override any definition, but it
      will provide one if there isn't one there.  */
   v = define_variable ("SHELL", 5, default_shell, o_default, 0);
@@ -611,6 +611,34 @@ try_variable_definition (filename, lineno, line, origin)
 	  flavor = append;
 	  break;
 	}
+      else if (c == '$')
+	{
+	  /* This might begin a variable expansion reference.  Make sure we
+	     don't misrecognize chars inside the reference as =, := or +=.  */
+	  char closeparen;
+	  int count;
+	  c = *p++;
+	  if (c == '(')
+	    closeparen = ')';
+	  else if (c == '{')
+	    closeparen = '}';
+	  else
+	    continue;		/* Nope.  */
+
+	  /* P now points past the opening paren or brace.
+	     Count parens or braces until it is matched.  */
+	  count = 0;
+	  for (; *p != '\0'; ++p)
+	    {
+	      if (*p == c)
+		++count;
+	      else if (*p == closeparen && --count < 0)
+		{
+		  ++p;
+		  break;
+		}
+	    }
+	}
     }
 
   beg = next_token (line);