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authorPatrick Georgi <patrick@georgi-clan.de>2012-05-05 15:11:22 +0200
committerStefan Reinauer <stefan.reinauer@coreboot.org>2012-05-08 00:36:09 +0200
commitc0e16e7024fbeb11975f0834a5d5d6c0d9f2e34e (patch)
tree59b3245344b462316bd4f79ad1f5df7d0492cdc0 /src/include
parente166782f397f7db2c4446c5e120fa30afbde7bdd (diff)
downloadcoreboot-c0e16e7024fbeb11975f0834a5d5d6c0d9f2e34e.tar.xz
Add config_enabled() from Linux
This change is taken from Linux. It allows to check for Kconfig definitions in the preprocessor and source code using the same idiom. Long term plan is to remove our Kconfig hack to #define values to 0, and this helps. This includes a tiny modification to the macros to fix romcc support. Change-Id: I0fddbea8c8ca215cf226acf39cb329b0ba0445a5 Signed-off-by: Patrick Georgi <patrick@georgi-clan.de> Reviewed-on: http://review.coreboot.org/1005 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/include')
-rw-r--r--src/include/kconfig.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/include/kconfig.h b/src/include/kconfig.h
new file mode 100644
index 0000000000..73106e905c
--- /dev/null
+++ b/src/include/kconfig.h
@@ -0,0 +1,21 @@
+#ifndef __KCONFIG_H__
+#define __KCONFIG_H__
+
+#include <config.h>
+
+/*
+ * Getting something that works in C and CPP for an arg that may or may
+ * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1"
+ * we match on the placeholder define, insert the "0," for arg1 and generate
+ * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one).
+ * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
+ * the last step cherry picks the 2nd arg, we get a zero.
+ */
+#define __ARG_PLACEHOLDER_1 0,
+#define config_enabled(cfg) _config_enabled(cfg)
+#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
+#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0, 0)
+#define ___config_enabled(__ignored, val, ...) val
+
+#define IS_ENABLED(option) config_enabled(option)
+#endif