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Local build options

Build times for pch and different kinds of dependencies

"full dependencies": build with MKDEPENDSOLVER=TRUE

sc, cygwin, Notebook, build -P4

• all: no output trees, full build
• none: just check that nothing must be built
• deps: only build dependencies

	all	none	deps
pch, module dependencies	21:39	0:08	0:45
no pch, module dependencies	25:04	0:08	0:45
no pch, full dependencies	26:14	0:12	1:42
pch, full dependencies	22:54	0:12	1:42

The same with sw:

	all	none	deps
pch, module dependencies	12:38	0:12	1:05
no pch, module dependencies	26:52	0:10	1:07
no pch, full dependencies	27:18	0:15	2:08
pch, full dependencies	14:15	0:18	2:06

And with svx:

	all	none	deps
pch, module dependencies	11:02	0:09	0:55
no pch, module dependencies	19:17	0:07	0:54
no pch, full dependencies	19:54	0:11	1:46
pch, full dependencies	11:57	0:13	1:48

Comments

PCH makes a difference, interestingly much more for sw than for sc. So we should keep it for Windows builds. On Linux builds other options exist like e.g. CCACHE.

The most surprising result: working with full dependencies does not make any remarkable difference, even on Windows where stating files is considered to be expensive. The "noop" times clearly show that. Of course creating the dependency files is more expensive, but it's less than 10% of the complete build time.