cmake: Touch $GIT_DIR/logs/HEAD if it does not already exist.
authorPeter Collingbourne <peter@pcc.me.uk>
Thu, 27 Apr 2017 17:04:05 +0000 (17:04 +0000)
committerPeter Collingbourne <peter@pcc.me.uk>
Thu, 27 Apr 2017 17:04:05 +0000 (17:04 +0000)
commiteaaba2b59ee61fba3cbe42de59121aad395c5681
tree199809ebb268847ecfef27acc935e23298c43d4e
parented129aebbb03ea836b666bc4b15d572e2cdd16dd
cmake: Touch $GIT_DIR/logs/HEAD if it does not already exist.

Apparently some git tools (such as "repo") may not create this file.
Patch by Quentin Neill.

llvm-svn: 301565
llvm/include/llvm/Support/CMakeLists.txt