buildroot/support/kconfig/patches/14-support-out-of-tree-config.patch

---
 conf.c     |    1 
 confdata.c |   62 ++++++++++++++++++++++++++++++++++++++++++++++---------------
 util.c     |   16 +++++++++++++--
 3 files changed, 61 insertions(+), 18 deletions(-)

Index: kconfig/conf.c
===================================================================
--- kconfig.orig/conf.c
+++ kconfig/conf.c
@@ -565,7 +565,6 @@ int main(int ac, char **av)
 	}
 	name = av[optind];
 	conf_parse(name);
-	//zconfdump(stdout);
 	if (sync_kconfig) {
 		name = conf_get_configname();
 		if (stat(name, &tmpstat)) {
Index: kconfig/confdata.c
===================================================================
--- kconfig.orig/confdata.c
+++ kconfig/confdata.c
@@ -13,6 +13,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <libgen.h>
 
 #include "lkc.h"
 
@@ -76,9 +77,7 @@ const char *conf_get_configname(void)
 
 const char *conf_get_autoconfig_name(void)
 {
-	char *name = getenv("KCONFIG_AUTOCONFIG");
-
-	return name ? name : "include/config/auto.conf";
+	return getenv("KCONFIG_AUTOCONFIG");
 }
 
 static char *conf_expand_value(const char *in)
@@ -748,6 +747,9 @@ int conf_write(const char *name)
 	char dirname[PATH_MAX+1], tmpname[PATH_MAX+1], newname[PATH_MAX+1];
 	char *env;
 
+	if (!name)
+		name = conf_get_configname();
+
 	dirname[0] = 0;
 	if (name && name[0]) {
 		struct stat st;
@@ -842,6 +844,7 @@ static int conf_split_config(void)
 {
 	const char *name;
 	char path[PATH_MAX+1];
+	char *opwd, *dir, *_name;
 	char *s, *d, c;
 	struct symbol *sym;
 	struct stat sb;
@@ -851,8 +854,20 @@ static int conf_split_config(void)
 	conf_read_simple(name, S_DEF_AUTO);
 	sym_calc_value(modules_sym);
 
-	if (chdir("include/config"))
-		return 1;
+	opwd = malloc(256);
+	_name = strdup(name);
+	if (opwd == NULL || _name == NULL)
+ 		return 1;
+	opwd = getcwd(opwd, 256);
+	dir = dirname(_name);
+	if (dir == NULL) {
+		res = 1;
+		goto err;
+	}
+	if (chdir(dir)) {
+		res = 1;
+		goto err;
+	}
 
 	res = 0;
 	for_all_symbols(i, sym) {
@@ -945,9 +960,11 @@ static int conf_split_config(void)
 		close(fd);
 	}
 out:
-	if (chdir("../.."))
-		return 1;
-
+	if (chdir(opwd))
+		res = 1;
+err:
+	free(opwd);
+	free(_name);
 	return res;
 }
 
@@ -957,25 +974,38 @@ int conf_write_autoconf(void)
 	const char *name;
 	FILE *out, *tristate, *out_h;
 	int i;
+	char dir[PATH_MAX+1], buf[PATH_MAX+1];
+	char *s;
+
+	strcpy(dir, conf_get_configname());
+	s = strrchr(dir, '/');
+	if (s)
+		s[1] = 0;
+	else
+		dir[0] = 0;
 
 	sym_clear_all_valid();
 
-	file_write_dep("include/config/auto.conf.cmd");
+	sprintf(buf, "%s.config.cmd", dir);
+	file_write_dep(buf);
 
 	if (conf_split_config())
 		return 1;
 
-	out = fopen(".tmpconfig", "w");
+	sprintf(buf, "%s.tmpconfig", dir);
+	out = fopen(buf, "w");
 	if (!out)
 		return 1;
 
-	tristate = fopen(".tmpconfig_tristate", "w");
+	sprintf(buf, "%s.tmpconfig_tristate", dir);
+	tristate = fopen(buf, "w");
 	if (!tristate) {
 		fclose(out);
 		return 1;
 	}
 
-	out_h = fopen(".tmpconfig.h", "w");
+	sprintf(buf, "%s.tmpconfig.h", dir);
+	out_h = fopen(buf, "w");
 	if (!out_h) {
 		fclose(out);
 		fclose(tristate);
@@ -1007,19 +1037,22 @@ int conf_write_autoconf(void)
 	name = getenv("KCONFIG_AUTOHEADER");
 	if (!name)
 		name = "include/generated/autoconf.h";
-	if (rename(".tmpconfig.h", name))
+	sprintf(buf, "%s.tmpconfig.h", dir);
+	if (rename(buf, name))
 		return 1;
 	name = getenv("KCONFIG_TRISTATE");
 	if (!name)
 		name = "include/config/tristate.conf";
-	if (rename(".tmpconfig_tristate", name))
+	sprintf(buf, "%s.tmpconfig_tristate", dir);
+	if (rename(buf, name))
 		return 1;
 	name = conf_get_autoconfig_name();
 	/*
 	 * This must be the last step, kbuild has a dependency on auto.conf
 	 * and this marks the successful completion of the previous steps.
 	 */
-	if (rename(".tmpconfig", name))
+	sprintf(buf, "%s.tmpconfig", dir);
+	if (rename(buf, name))
 		return 1;
 
 	return 0;
Index: kconfig/util.c
===================================================================
--- kconfig.orig/util.c
+++ kconfig/util.c
@@ -34,6 +34,8 @@ struct file *file_lookup(const char *nam
 /* write a dependency file as used by kbuild to track dependencies */
 int file_write_dep(const char *name)
 {
+	char *str;
+	char buf[PATH_MAX+1], buf2[PATH_MAX+1], dir[PATH_MAX+1];
 	struct symbol *sym, *env_sym;
 	struct expr *e;
 	struct file *file;
@@ -41,7 +43,16 @@ int file_write_dep(const char *name)
 
 	if (!name)
 		name = ".kconfig.d";
-	out = fopen("..config.tmp", "w");
+
+	strcpy(dir, conf_get_configname());
+	str = strrchr(dir, '/');
+	if (str)
+		str[1] = 0;
+	else
+		dir[0] = 0;
+
+	sprintf(buf, "%s..config.tmp", dir);
+	out = fopen(buf, "w");
 	if (!out)
 		return 1;
 	fprintf(out, "deps_config := \\\n");
@@ -72,7 +83,8 @@ int file_write_dep(const char *name)
 
 	fprintf(out, "\n$(deps_config): ;\n");
 	fclose(out);
-	rename("..config.tmp", name);
+	sprintf(buf2, "%s%s", dir, name);
+	rename(buf, buf2);
 	return 0;
 }