[patch][pr17429] Do nothing in a null build if CLANG_ALWAYS_CHECK_VC_REV is OFF

Rafael EspĂ­ndola rafael.espindola at gmail.com
Tue Oct 1 07:14:21 PDT 2013

Most of the time in a null build is spent checking the svn revision
number. This is very wasteful in a regular development environment.

If I understand CLANG_ALWAYS_CHECK_VC_REV correctly, it is also the
case that the version is not even always used, so we spend time for

The attached patch moves the entire version check under
CLANG_ALWAYS_CHECK_VC_REV. On my machine that makes a null build of
bin/clang 11 times faster.

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