From 9052b52dfc69d9567e2e664b0f096bfae535bcad Mon Sep 17 00:00:00 2001
From: Paul Smith <psmith@gnu.org>
Date: Fri, 10 May 2002 03:15:07 +0000
Subject: Fix Debian bug #144306: pass target-specific variables into the
 environment properly.

Fix configure: allow cross-compilation; fix getloadavg (still needs _lots_
of work!)

Let $(call ...) functions to be self-referencing.  Lets us do transitive
closures, for example.
---
 variable.h | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

(limited to 'variable.h')

diff --git a/variable.h b/variable.h
index 9c23511..8d4853f 100644
--- a/variable.h
+++ b/variable.h
@@ -35,19 +35,28 @@ enum variable_origin
    Each bucket of the hash table is a chain of these,
    chained through `next'.  */
 
+#define EXP_COUNT_BITS  15      /* This gets all the bitfields into 32 bits */
+
+#define EXP_COUNT_MAX   ((1<<EXP_COUNT_BITS)-1)
+
 struct variable
   {
     struct variable *next;	/* Link in the chain.  */
     char *name;			/* Variable name.  */
     char *value;		/* Variable value.  */
     struct floc fileinfo;       /* Where the variable was defined.  */
-    enum variable_origin
-      origin ENUM_BITFIELD (3);	/* Variable origin.  */
     unsigned int recursive:1;	/* Gets recursively re-evaluated.  */
     unsigned int expanding:1;	/* Nonzero if currently being expanded.  */
+    unsigned int exp_count:EXP_COUNT_BITS;
+                                /* If >1, allow this many self-referential
+                                   expansions */
     unsigned int per_target:1;	/* Nonzero if a target-specific variable.  */
     unsigned int append:1;	/* Nonzero if an appending target-specific
                                    variable.  */
+
+    enum variable_origin
+      origin ENUM_BITFIELD (3);	/* Variable origin.  */
+
     enum variable_export
       {
 	v_export,		/* Export this variable.  */
@@ -95,7 +104,9 @@ extern char *patsubst_expand PARAMS ((char *o, char *text, char *pattern, char *
 		char *pattern_percent, char *replace_percent));
 
 /* expand.c */
-extern char *recursively_expand PARAMS ((struct variable *v));
+extern char *recursively_expand_for_file PARAMS ((struct variable *v,
+                                                  struct file *file));
+#define recursively_expand(v)   recursively_expand_for_file (v, NULL)
 
 /* variable.c */
 extern struct variable_set_list *create_new_variable_set PARAMS ((void));
@@ -135,6 +146,15 @@ extern struct variable *define_variable_in_set
 #define define_variable_for_file(n,l,v,o,r,f) \
           define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF)
 
+/* Warn that NAME is an undefined variable.  */
+
+#define warn_undefined(n,l) do{\
+                              if (warn_undefined_variables_flag) \
+                                error (reading_file, \
+                                       _("warning: undefined variable `%.*s'"), \
+                                (int)(l), (n)); \
+                              }while(0)
+
 extern char **target_environment PARAMS ((struct file *file));
 
 extern int export_all_variables;
-- 
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