[libc] Make all targets respect LLVM_PER_TARGET_RUNTIME_DIR

[jhuber6]

Summary:
The libcxx and compiler-rt already install their headers according
to the triple if this option is enabled. We should do this by default so
these don't get mixed up when people potentially combine multiple
toolchains.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Joseph Huber (jhuber6)

Changes

Summary:
The libcxx and compiler-rt already install their headers according
to the triple if this option is enabled. We should do this by default so
these don't get mixed up when people potentially combine multiple
toolchains.

---

Full diff: https://github.com/llvm/llvm-project/pull/160597.diff

1 Files Affected:

• (modified) libc/CMakeLists.txt (+1-1)

diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index 4f3704ec9aa9b..14718e2090bde 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -246,7 +246,7 @@ else()
     set(LIBC_INCLUDE_DIR ${CMAKE_BINARY_DIR}/include)
     set(LIBC_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX})
   endif()
-  if(LIBC_TARGET_OS_IS_GPU)
+  if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
     if(LIBC_TARGET_TRIPLE)
       set(LIBC_INSTALL_INCLUDE_DIR ${CMAKE_INSTALL_INCLUDEDIR}/${LIBC_TARGET_TRIPLE})
     else()