On 21 Dec '06, at 6:37 AM, Daniel Stenberg wrote:
I want to modify libssh2 to always build with debug output ability
when it is
built with ./configure --enable-debug, and just provide a function
to switch
on/off the different outputs that currently are controlled with
#ifdefs.
Good idea. I always do something similar in projects I write. I use a
logging macro like this:
#ifdef LOGGING_ENABLED
extern bool gLogging;
#else
#define gLogging false
#endif
#define Log if( !gLogging ) ; else printf
This gives you a Log() macro you call just like printf. If at compile-
time you define LOGGING_ENABLED, then at runtime you can turn it on or
off by setting the variable gLogging. When gLogging is off, there is
nearly zero runtime overhead (just testing a global and jumping over
the printf call.) And in a production build if you don't define
LOGGING_ENABLED, the log calls don't get compiled at all.
--Jens
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