In the scripts/Makefile.build, use KCONFIG_AUTOCONFIG to include a
custom path for the "auto.conf" file.

The "*conf" programs were modified so as to work with the environment
variable KCONFIG_AUTOCONFIG.

Signed-off-by: Alexis Berlemont <alexis.berlem...@gmail.com>
---

Changes since v1:
 * Use PATH_MAX instead of PATH_MAXLENGTH
 * Simplify conf_get_autoconfigdep_name() according to Micheal Marek's
   advices
 * Remove a superfluous assignment

 scripts/Makefile.build     |  3 ++-
 scripts/kconfig/confdata.c | 23 ++++++++++++++++++++++-
 scripts/kconfig/lkc.h      |  1 +
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 649ce68..2abb82f 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -31,7 +31,8 @@ subdir-asflags-y :=
 subdir-ccflags-y :=
 
 # Read auto.conf if it exists, otherwise ignore
--include include/config/auto.conf
+kconfig-autoconfig := $(if 
$(KCONFIG_AUTOCONFIG),$(KCONFIG_AUTOCONFIG),include/config/auto.conf)
+-include $(kconfig-autoconfig)
 
 include scripts/Kbuild.include
 
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index f88d90f..75cf6bf 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -75,6 +75,23 @@ const char *conf_get_autoconfig_name(void)
        return name ? name : "include/config/auto.conf";
 }
 
+const char *conf_get_autoconfigdep_name(void)
+{
+       static char res_value[PATH_MAX+1];
+
+       const char *name = conf_get_autoconfig_name();
+
+       if (strlen(name) > PATH_MAX - 4)
+               name = NULL;
+       else {
+               strcpy(res_value, name);
+               strcat(res_value, ".cmd");
+               name = res_value;
+       }
+
+       return name;
+}
+
 static char *conf_expand_value(const char *in)
 {
        struct symbol *sym;
@@ -953,7 +970,11 @@ int conf_write_autoconf(void)
 
        sym_clear_all_valid();
 
-       file_write_dep("include/config/auto.conf.cmd");
+       name = conf_get_autoconfigdep_name();
+       if (name == NULL)
+               return 1;
+
+       file_write_dep(name);
 
        if (conf_split_config())
                return 1;
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index d5daa7a..ac99004 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -84,6 +84,7 @@ const char *zconf_curname(void);
 /* confdata.c */
 const char *conf_get_configname(void);
 const char *conf_get_autoconfig_name(void);
+const char *conf_get_autoconfigdep_name(void);
 char *conf_get_default_confname(void);
 void sym_set_change_count(int count);
 void sym_add_change_count(int count);
-- 
2.1.1

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