buildroot/support/kconfig/patches/03-change-config-option-prefix.patch

---
 confdata.c |   57 +++++++++++++++++++++++++++++----------------------------
 lkc.h      |    2 +-
 menu.c     |    2 +-
 3 files changed, 31 insertions(+), 30 deletions(-)

Index: b/confdata.c
===================================================================
--- a/confdata.c
+++ b/confdata.c
@@ -13,6 +13,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <libgen.h>
 
 #include "lkc.h"
 
@@ -25,7 +26,7 @@
 static const char *conf_filename;
 static int conf_lineno, conf_warnings, conf_unsaved;
 
-const char conf_defname[] = "arch/$ARCH/defconfig";
+const char conf_defname[] = ".defconfig";
 
 static void conf_warning(const char *fmt, ...)
 {
@@ -63,7 +64,7 @@
 
 const char *conf_get_configname(void)
 {
-	char *name = getenv("KCONFIG_CONFIG");
+	char *name = getenv("BUILDROOT_CONFIG");
 
 	return name ? name : ".config";
 }
@@ -309,20 +310,20 @@
 		if (line[0] == '#') {
 			if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
 				continue;
-			p = strchr(line + 2 + strlen(CONFIG_), ' ');
+			p = strchr(line + 2, ' ');
 			if (!p)
 				continue;
 			*p++ = 0;
 			if (strncmp(p, "is not set", 10))
 				continue;
 			if (def == S_DEF_USER) {
-				sym = sym_find(line + 2 + strlen(CONFIG_));
+				sym = sym_find(line + 2);
 				if (!sym) {
 					sym_add_change_count(1);
 					goto setsym;
 				}
 			} else {
-				sym = sym_lookup(line + 2 + strlen(CONFIG_), 0);
+				sym = sym_lookup(line + 2, 0);
 				if (sym->type == S_UNKNOWN)
 					sym->type = S_BOOLEAN;
 			}
@@ -338,8 +339,8 @@
 			default:
 				;
 			}
-		} else if (memcmp(line, CONFIG_, strlen(CONFIG_)) == 0) {
-			p = strchr(line + strlen(CONFIG_), '=');
+		} else if (isupper(line[0])) {
+			p = strchr(line, '=');
 			if (!p)
 				continue;
 			*p++ = 0;
@@ -350,13 +351,13 @@
 					*p2 = 0;
 			}
 			if (def == S_DEF_USER) {
-				sym = sym_find(line + strlen(CONFIG_));
+				sym = sym_find(line);
 				if (!sym) {
 					sym_add_change_count(1);
 					goto setsym;
 				}
 			} else {
-				sym = sym_lookup(line + strlen(CONFIG_), 0);
+				sym = sym_lookup(line, 0);
 				if (sym->type == S_UNKNOWN)
 					sym->type = S_OTHER;
 			}
@@ -484,8 +485,8 @@
 			bool skip_unset = (arg != NULL);
 
 			if (!skip_unset)
-				fprintf(fp, "# %s%s is not set\n",
-				    CONFIG_, sym->name);
+				fprintf(fp, "# %s is not set\n",
+				    sym->name);
 			return;
 		}
 		break;
@@ -493,7 +494,7 @@
 		break;
 	}
 
-	fprintf(fp, "%s%s=%s\n", CONFIG_, sym->name, value);
+	fprintf(fp, "%s=%s\n", sym->name, value);
 }
 
 static void
@@ -543,8 +544,8 @@
 			suffix = "_MODULE";
 			/* fall through */
 		default:
-			fprintf(fp, "#define %s%s%s 1\n",
-			    CONFIG_, sym->name, suffix);
+			fprintf(fp, "#define %s%s 1\n",
+			    sym->name, suffix);
 		}
 		break;
 	}
@@ -553,14 +554,14 @@
 
 		if (value[0] != '0' || (value[1] != 'x' && value[1] != 'X'))
 			prefix = "0x";
-		fprintf(fp, "#define %s%s %s%s\n",
-		    CONFIG_, sym->name, prefix, value);
+		fprintf(fp, "#define %s %s%s\n",
+		    sym->name, prefix, value);
 		break;
 	}
 	case S_STRING:
 	case S_INT:
-		fprintf(fp, "#define %s%s %s\n",
-		    CONFIG_, sym->name, value);
+		fprintf(fp, "#define %s %s\n",
+		    sym->name, value);
 		break;
 	default:
 		break;
@@ -606,7 +607,7 @@
 {
 
 	if (sym->type == S_TRISTATE && *value != 'n')
-		fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
+		fprintf(fp, "%s=%c\n", sym->name, (char)toupper(*value));
 }
 
 static struct conf_printer tristate_printer_cb =
Index: b/lkc.h
===================================================================
--- a/lkc.h
+++ b/lkc.h
@@ -37,7 +37,7 @@
 #define N_(text) (text)
 
 #ifndef CONFIG_
-#define CONFIG_ "CONFIG_"
+#define CONFIG_ "BR2_"
 #endif
 static inline const char *CONFIG_prefix(void)
 {
Index: b/menu.c
===================================================================
--- a/menu.c
+++ b/menu.c
@@ -635,7 +635,7 @@
 
 	if (menu_has_help(menu)) {
 		if (sym->name)
-			str_printf(help, "%s%s:\n\n", CONFIG_, sym->name);
+			str_printf(help, "%s:\n\n", sym->name);
 		help_text = menu_get_help(menu);
 	}
 	str_printf(help, "%s\n", _(help_text));