[libcxx] Use joined format for include flag on Windows
authorPetr Hosek <phosek@google.com>
Thu, 29 Apr 2021 17:11:39 +0000 (10:11 -0700)
committerPetr Hosek <phosek@google.com>
Fri, 30 Apr 2021 18:40:30 +0000 (11:40 -0700)
commitdcbfb6f8735a517f7142779ac7c804607f65d7a9
treef0778e5bdea435227dd729f7c1ffedd7576e219e
parentdde24a87c55f82d8c7b3bf3eafb10f2b9b2b9a01
[libcxx] Use joined format for include flag on Windows

Without this, CMake deduplicates the /I flag breaking the build. See
https://cmake.org/cmake/help/v3.13/command/target_compile_options.html
for more details on why this is needed.

Differential Revision: https://reviews.llvm.org/D101550
libcxx/include/CMakeLists.txt