[PATCH] Fix libc++ header install on darwin.

[Jean-Daniel Dupas]

Hi howard.hinnant,

On darwin, clang looks for libc++ headers in 'lib/c++/v1' and not in 'include/c++/v1' like on other OSes.

This patch update the libc++ CMake build system to install the libc++ headers at the right place on darwin.

http://llvm-reviews.chandlerc.com/D2122

Files:
  CMakeLists.txt
  lib/CMakeLists.txt

Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -71,6 +71,12 @@
   )
 set(LIBCXX_TARGET_TRIPLE ${LIBCXX_TARGET_TRIPLE} CACHE STRING "Target triple.")
 
+if ( APPLE )
+  set(LIBCXX_HEADERS_INSTALL_DIR lib)
+else()
+  set(LIBCXX_HEADERS_INSTALL_DIR include)
+endif()
+
 #===============================================================================
 # Add an ABI library if appropriate
 #===============================================================================
@@ -127,7 +133,7 @@
   set(LIBCXX_CXX_ABI_DEPS abilib_headers)
   include_directories("${CMAKE_BINARY_DIR}/include")
   install(DIRECTORY "${CMAKE_BINARY_DIR}/include/"
-    DESTINATION include/c++/v1
+    DESTINATION ${LIBCXX_HEADERS_INSTALL_DIR}/c++/v1
     FILES_MATCHING
     PATTERN "*"
     )
Index: lib/CMakeLists.txt
===================================================================
--- lib/CMakeLists.txt
+++ lib/CMakeLists.txt
@@ -106,7 +106,7 @@
 endif()
 
 install(DIRECTORY ../include/
-  DESTINATION include/c++/v1
+  DESTINATION ${LIBCXX_HEADERS_INSTALL_DIR}/c++/v1
   FILES_MATCHING
   PATTERN "*"
   PATTERN ".svn" EXCLUDE
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