On Tue, Mar 29, 2016 at 3:48 AM, Guy Harris <g...@alum.mit.edu> wrote:
> > which is a bit of a greasy hack - appending an empty string to str, just > so it's marked as used - but I suspect the extra CPU time spent doing that, > on platforms unlucky enough not to have zlib, will be lost in the noise. > I would not go with splitting the prototype with #define. It makes the code hard to read. But calling g_string_append_printf() with a null string makes an unnecessary call. Maybe the compiler is so smart to unroll all the code and use a noop instead of the call, but I'm not an expert. Other possible hacks (more readable or faster) hack 1: #if defined(HAVE_LIBZ) && !defined(_WIN32) #define ZLIB_PARAM_UNUSED #else #define ZLIB_PARAM_UNUSED _U_ #endif get_reordercap_runtime_info(GString *str ZLIB_PARAM_UNUSED) { /* zlib */ #if defined(HAVE_LIBZ) && !defined(_WIN32) g_string_append_printf(str, ", with libz %s", zlibVersion()); #endif } hack 2: #define UNUSED(x) (void*)(x) static void get_reordercap_runtime_info(GString *str) { /* zlib */ #if defined(HAVE_LIBZ) && !defined(_WIN32) g_string_append_printf(str, ", with libz %s", zlibVersion()); #else UNUSED(str); #endif }
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