tree 40984715e4ebecbd5e264a32b69618f92a9461eb
parent 03856f1e0af190a6099043840e585469e32dbfa5
author Petr Hosek <phosek@chromium.org> 1523247784 +0000
committer Petr Hosek <phosek@chromium.org> 1523247784 +0000

[CMake] Use custom command and target to install libc++ headers

Using file(COPY FILE...) has several downsides. Since the file command
is only executed at configuration time, any changes to headers made
after the initial CMake execution are ignored. This can lead to subtle
errors since the just built Clang will be using stale libc++ headers.
Furthermore, since the headers are copied prior to executing the build
system, this may hide missing dependencies on libc++ from other LLVM
components.

This changes replaces the use of file(COPY FILE...) command with a
custom command and target which addresses all aforementioned issues and
matches the implementation already used by other LLVM components that
also install headers like Clang builtin headers.

Differential Revision: https://reviews.llvm.org/D44773

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@329544 91177308-0d34-0410-b5e6-96231b3b80d8