Christian Ehrlicher wrote:
* We're using an NMake build tree, is NMake particularly
slow? Do any of the other makes work more efficiently?
Be aware that nmake builds are much slower than using devenv, as nmake
starts a cl.exe process for every single file,
whereas devenv calls cl.exe with several source files. This costs, due
to the high process overhead on Windows.
I understand that.
It's not a nmake problem but a problem of cmake. cmake does not support batched
build - already opened a bug long time ago because of this.
I am not sure how much faster a batch build would be. The real issue is
the dual or more core machines. Even with a batch build and cl, it
still only uses one processor, where devenv uses more. I use gmake and
cl to get around this with -j N. However, gmake is slower than nmake
because it uses the POSIX stat which is VERY slow on Windows. Someday I
am going to hack gmake to use the Windows native calls to stat files. I
almost think that would be time better spent than adding batch cl calls
to CMake. I would like to see some bench marks on cl batch builds. It
will not be trivial to implement and I don't think it would be worth the
effort unless it has a big gain.
-Bill
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