On 3/6/2012 9:09 PM, Clifford Yapp wrote:
We use the same configuration tests on all platforms in an effort to
avoid having large chunks of platform-specific code in our build files,
but we pay a price for this on Windows - the same test process is more
than an order of magnitude slower with MSVC than (say) Linux.
Does CMake launch the MSVC C++ compiler each time it needs to do a
TRY_COMPILE or similar test? If so, does anybody know of any techniques
for combining tests or some way to run a cl.exe instance as a "daemon"
to which multiple files can be fed without needing a full restart of cl.exe?
No, good way to do this on windows. The best you can do is to make sure
it tries the windows stuff first, and that you remove as many
try-compiles as possible when on Windows. Not only does CMake launch
cl.exe, but it will also launch devenv.com with command line build
arguments.... :) It is the only way to make sure that the compile
environments are exact. So, you can optimize a build for windows with a
bit of work, but there is nothing easy to do from CMake to make this faster.
-Bill
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