On Die, 2013-11-26 at 10:50 +0800, 乃宏周 wrote: > I read manual already: > > -D name=definition The contents of definition are tokenized and processed > as if they appeared during translation phase three in a ‘#define’ > directive. In particular, the definition will be truncated by embedded > newline characters. > > If you are invoking the preprocessor from a shell or shell-like program you > may need to use the shell's quoting syntax to protect characters such as > spaces that have a meaning in the shell syntax. > > If you wish to define a function-like macro on the command line, write its > argument list with surrounding parentheses before the equals sign (if any). > Parentheses are meaningful to most shells, so you will need to quote the > option. With sh and csh, -D'name(args...)=definition' works. > I wrote this in my makefile: > > *def_dpf = 'dpf(a...)=printk(KERN_ALERT a)'* Variadic macros needs something slightly different on the right side - see also http://gcc.gnu.org/onlinedocs/cpp/Variadic-Macros.html (if we assume gcc). Send the gcc invocation or at least a real snippet of the real Makefile so that no one has to guess what's really there (and where). At least - following the above "manual": -D'dpf(...)=printk(KERN_ALERT __VA_ARGS__)' Though I write such macros more like -D'dpf(fmt, ...)=printk(KERN_ALERT fmt, __VA_ARGS__)' if only for clarity. > My code uses `dpf` macro like this: > > *dpf("current value=%d\n",var);* > > When I compiling my program, I got this error: > > *error: ‘Da’ undeclared (first use in this function)* No idea where the 'Da' could come from. Which leads to the conclusion that at least comething is missing .... > Even manual says *sh* and *csh* can works with that definition, It' just about the quoting and pretty any shell should work with single-quotes. If not, you need to fix the Makefile - you can set the shell to be used there. > *bash*should support that machanism, I guess. How should I do? Any > suggestion? And what has that to do with any/the shell? Kind regards, Bernd -- Bernd Petrovitsch Email : bernd@xxxxxxxxxxxxxxxxxxx LUGA : http://www.luga.at _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
