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@petrovitsch.priv.at LUGA : http://www.luga.at