On 08/28/2015 07:59 PM, Stefan Hajnoczi wrote:
On Wed, Aug 26, 2015 at 06:42:01PM +0800, Xiao Guangrong wrote:
On 08/26/2015 12:16 AM, Stefan Hajnoczi wrote:
On Fri, Aug 14, 2015 at 10:52:06PM +0800, Xiao Guangrong wrote:
+#ifdef NVDIMM_DEBUG
+#define nvdebug(fmt, ...) fprintf(stderr, "nvdimm: " fmt, ## __VA_ARGS__)
+#else
+#define nvdebug(...)
+#endif
The following allows the compiler to check format strings and syntax
check the argument expressions:
#define NVDIMM_DEBUG 0 /* set to 1 for debug output */
#define nvdebug(fmt, ...) \
if (NVDIMM_DEBUG) { \
fprintf(stderr, "nvdimm: " fmt, ## __VA_ARGS__); \
}
This approach avoids bitrot (e.g. debug format string arguments have
become outdated).
Really good tips, thanks for your sharing.
I forgot the do { ... } while (0) in the macro to make nvdebug("hello
world"); work like a normal C statement.
Got it, will keep it in my mind.
