[libunwind] r295153 - [libunwind][CMake] Use libc++ headers when available

[Petr Hosek via cfe-commits]

Author: phosek
Date: Wed Feb 15 00:41:57 2017
New Revision: 295153

URL: http://llvm.org/viewvc/llvm-project?rev=295153&view=rev
Log:
[libunwind][CMake] Use libc++ headers when available

libunwind depends on C++ library headers. When building libunwind
as part of LLVM and libc++ is available, use its headers.

Differential Revision: https://reviews.llvm.org/D29800

Modified:
    libunwind/trunk/CMakeLists.txt

Modified: libunwind/trunk/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/libunwind/trunk/CMakeLists.txt?rev=295153&r1=295152&r2=295153&view=diff
==============================================================================
--- libunwind/trunk/CMakeLists.txt (original)
+++ libunwind/trunk/CMakeLists.txt Wed Feb 15 00:41:57 2017
@@ -282,4 +282,24 @@ endif()
 
 include_directories(include)
 
+find_path(
+  LIBUNWIND_LIBCXX_INCLUDES_INTERNAL
+  __libcpp_version
+  PATHS ${LLVM_MAIN_SRC_DIR}/projects/libcxx/include
+        ${LLVM_MAIN_SRC_DIR}/runtimes/libcxx/include
+  NO_DEFAULT_PATH
+)
+if ((NOT LIBUNWIND_STANDALONE_BUILD OR HAVE_LIBCXX) AND
+    IS_DIRECTORY "${LIBUNWIND_LIBCXX_INCLUDES_INTERNAL}")
+  set(LIBUNWIND_CXX_INCLUDE_PATHS_DEFAULT "${LIBUNWIND_LIBCXX_INCLUDES_INTERNAL}")
+endif()
+
+set(LIBUNWIND_CXX_INCLUDE_PATHS "${LIBUNWIND_CXX_INCLUDE_PATHS_DEFAULT}" CACHE PATH
+    "Paths to C++ header directories separated by ';'.")
+
+if (NOT LIBUNWIND_CXX_INCLUDE_PATHS STREQUAL "")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nostdinc++")
+  include_directories("${LIBUNWIND_CXX_INCLUDE_PATHS}")
+endif()
+
 add_subdirectory(src)