llvm-project

00dc72fa - [CAS] LLVM_ENABLE_ONDISK_CAS requires `flock` on UNIX (#159207)

[CAS] LLVM_ENABLE_ONDISK_CAS requires `flock` on UNIX (#159207) As a follow up to #159122, after figure out reason why CAS unit tests are failing on Solaris, update the CMake configuration to build ondisk CAS implementation. We now check the existance of `flock` before enabling the configuration. In the future, we can find ways to support OnDiskCAS on other platforms that do not have `flock`. This can techinically be done with a POSIX compilant file lock but that will put a restriction on the usage of CAS.