Return a non-zero exit code if an error occurs during dts parsing.

Previously, only failure to parse caused the reading of the tree to fail;
semantic errors that called yyerror() but not YYERROR only emitted a message,
without signalling make to stop the build.

Signed-off-by: Scott Wood <scottwood@freescale.com>

dtc-parser.y

@@ -28,6 +28,7 @@ int yylex(void);
 unsigned long long eval_literal(const char *s, int base, int bits);
 
 extern struct boot_info *the_boot_info;
+extern int treesource_error;
 
 %}
 
@@ -320,6 +321,7 @@ void yyerrorf(char const *s, ...)
 	vfprintf(stderr, s, va);
 	fprintf(stderr, "\n");
 
+	treesource_error = 1;
 	va_end(va);
 }
 

dtc.c

@@ -205,7 +205,7 @@ int main(int argc, char *argv[])
 	if (inf && inf->file != stdin)
 		fclose(inf->file);
 
-	if (! bi || ! bi->dt)
+	if (! bi || ! bi->dt || bi->error)
 		die("Couldn't read input tree\n");
 
 	process_checks(force, bi);

dtc.h

@@ -233,6 +233,7 @@ struct reserve_info *add_reserve_entry(struct reserve_info *list,
 struct boot_info {
 	struct reserve_info *reservelist;
 	struct node *dt;		/* the device tree */
+	int error;
 };
 
 struct boot_info *build_boot_info(struct reserve_info *reservelist,

livetree.c

@@ -172,6 +172,7 @@ struct boot_info *build_boot_info(struct reserve_info *reservelist,
 	bi = xmalloc(sizeof(*bi));
 	bi->reservelist = reservelist;
 	bi->dt = tree;
+	bi->error = 0;
 
 	return bi;
 }

treesource.c

@@ -25,10 +25,12 @@ extern FILE *yyin;
 extern int yyparse(void);
 
 struct boot_info *the_boot_info;
+int treesource_error;
 
 struct boot_info *dt_from_source(const char *fname)
 {
 	the_boot_info = NULL;
+	treesource_error = 0;
 
 	push_input_file(fname);
 
@@ -37,6 +39,7 @@ struct boot_info *dt_from_source(const char *fname)
 
 	fill_fullpaths(the_boot_info->dt, "");
 
+	the_boot_info->error = treesource_error;
 	return the_boot_info;
 }