[PATCH v2 17/50] kconfig: Add host support to CONFIG_IS_ENABLED()

[Simon Glass]

At present we must separately test for the host build for many options,
since we force them to be enabled. For example, CONFIG_FIT is always
enabled in the host tools, even if CONFIG_FIT is not enabled by the
board itself.

It would be more convenient if we could use, for example,
CONFIG_IS_ENABLED(FIT) and get CONFIG_HOST_FIT, when building for the
host. Add support for this.

Signed-off-by: Simon Glass <sjg at chromium.org>
Suggested-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk> # b4f73886
---

Changes in v2:
- Fix up comment to put an underscore after every CONFIG
- Correct comment about USE_HOSTCC being undefined in CONFIG_VAL()

 include/linux/kconfig.h | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h
index d109ed3119e..179b9fd1e0d 100644
--- a/include/linux/kconfig.h
+++ b/include/linux/kconfig.h
@@ -31,11 +31,14 @@
 	(config_enabled(option))
 
 /*
- * U-Boot add-on: Helper macros to reference to different macros
- * (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context.
+ * U-Boot add-on: Helper macros to reference to different macros (prefixed by
+ * CONFIG_, CONFIG_SPL_, CONFIG_TPL_ or CONFIG_HOST_), depending on the build
+ * context.
  */
 
-#if defined(CONFIG_TPL_BUILD)
+#ifdef USE_HOSTCC
+#define _CONFIG_PREFIX HOST_
+#elif defined(CONFIG_TPL_BUILD)
 #define _CONFIG_PREFIX TPL_
 #elif defined(CONFIG_SPL_BUILD)
 #define _CONFIG_PREFIX SPL_
@@ -49,6 +52,7 @@
 
 /*
  * CONFIG_VAL(FOO) evaluates to the value of
+ *  CONFIG_HOST_FOO if USE_HOSTCC is defined,
  *  CONFIG_FOO if CONFIG_SPL_BUILD is undefined,
  *  CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
  *  CONFIG_TPL_FOO if CONFIG_TPL_BUILD is defined.
@@ -76,18 +80,21 @@
 
 /*
  * CONFIG_IS_ENABLED(FOO) expands to
+ *  1 if USE_HOSTCC is defined and CONFIG_HOST_FOO is set to 'y',
  *  1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
  *  1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
  *  1 if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
  *  0 otherwise.
  *
  * CONFIG_IS_ENABLED(FOO, (abc)) expands to
+ *  abc if USE_HOSTCC is defined and CONFIG_HOST_FOO is set to 'y',
  *  abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
  *  abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
  *  abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
  *  nothing otherwise.
  *
  * CONFIG_IS_ENABLED(FOO, (abc), (def)) expands to
+ *  abc if USE_HOSTCC is defined and CONFIG_HOST_FOO is set to 'y',
  *  abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
  *  abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
  *  abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
-- 
2.31.1.607.g51e8a6a459-goog