COMMON: Add __stringify() function

Copied from Linux kernel:
commit 8f7c2c37319a81ef4c2bfdec67b1ccd5744d97e4
Date:   Wed Apr 8 16:58:57 2009 +0800

Pull in the __stringify() macro from Linux kernel. This macro is usually used to
convert numbers to strings at preprocessor level, yet it is not limited only to
that. This is useful as it allows higher usage of puts() in favour of printf().

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Wolfgang Denk <wd@denx.de>

diff --git a/include/common.h b/include/common.h
index a7fb05e52ee13c6f85b615750623c3e73e4dcdf6..7d9ab1540b6e22f2b0bd7841fa2c4c27d4a5af9c 100644 (file)
--- 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 (file)
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 */