[U-Boot] [PATCH 1/3] COMMON: Add __stringify() function

[Marek Vasut]

This function converts static number to string in preprocessor.
This is useful as it allows higher usage of puts() in favour of printf()

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Wolfgang Denk <wd at denx.de>
---
 include/common.h          |    1 +
 include/linux/stringify.h |   12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 include/linux/stringify.h

diff --git a/include/common.h b/include/common.h
index 39859d3..8f596ec 100644
--- a/include/common.h
+++ b/include/common.h
@@ -39,6 +39,7 @@ typedef volatile unsigned char	vu_char;
 #include <linux/bitops.h>
 #include <linux/types.h>
 #include <linux/string.h>
+#include <linux/stringify.h>
 #include <asm/ptrace.h>
 #include <stdarg.h>
 #if defined(CONFIG_PCI) && (defined(CONFIG_4xx) && !defined(CONFIG_AP1000))
diff --git a/include/linux/stringify.h b/include/linux/stringify.h
new file mode 100644
index 0000000..841cec8
--- /dev/null
+++ b/include/linux/stringify.h
@@ -0,0 +1,12 @@
+#ifndef __LINUX_STRINGIFY_H
+#define __LINUX_STRINGIFY_H
+
+/* Indirect stringification.  Doing two levels allows the parameter to be a
+ * macro itself.  For example, compile with -DFOO=bar, __stringify(FOO)
+ * converts to "bar".
+ */
+
+#define __stringify_1(x...)	#x
+#define __stringify(x...)	__stringify_1(x)
+
+#endif	/* !__LINUX_STRINGIFY_H */
-- 
1.7.10.4