Sat, 13 Dec 2008 07:37:18 +0900, Bill Baxter wrote: > So how fast is dmd -o-? Does this pretty much double the compile time? > An option to reuse a previously generated .deps might be nice.
Here's the benchmark. I'm compiling dwt-samples\examples\helloworld\HelloWorld5.d from dwt trunk rev. 119, without any pre-compilation. The system is a 1.83 GHz Core2 Duo notebook under Win XP. The compiler is DMD 1.033/Tango. The -c -o- -v stage takes 0.97 seconds (best of five, all files in memory, no swap). The result is a list of 202 files in win-dwt. That's more than a half of dwt (357 .d files). The actual build phase takes 3.27 seconds, best of five, etc. The result is a working 1.7 MB executable. So the -v phase is at least 3 times faster than the actual compilation. Also note that in -o- mode the compiler misses some semantic errors which means it doesn't do full analysis.