From a358fbe504cec211a5742d9c984aed9b25f9ff4a Mon Sep 17 00:00:00 2001
From: "Michael J. Spencer" <bigcheesegs@gmail.com>
Date: Fri, 30 Nov 2012 21:02:29 +0000
Subject: [PATCH] [CMake] Add support for selecting which c++ abi library to
 use.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@169036 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt     | 53 ++++++++++++++++++++++++++++++++++++++++++++++
 lib/CMakeLists.txt |  3 +++
 src/exception.cpp  |  6 +++---
 3 files changed, 59 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ca8ad57d6..0f7941c48 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,6 +39,11 @@ option(LIBCXX_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
 option(LIBCXX_ENABLE_CXX0X "Enable -std=c++0x and use of c++0x language features if the compiler supports it." ON)
 option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON)
 
+set(CXXABIS none libcxxabi libcxxrt libsupc++)
+set(LIBCXX_CXX_ABI "${LIBCXX_CXX_ABI}" CACHE STRING
+    "Specify C++ ABI library to use." FORCE)
+set_property(CACHE LIBCXX_CXX_ABI PROPERTY STRINGS "";${CXXABIS})
+
 #===============================================================================
 # Configure System
 #===============================================================================
@@ -58,6 +63,54 @@ get_target_triple(LIBCXX_TARGET_TRIPLE
   )
 set(LIBCXX_TARGET_TRIPLE ${LIBCXX_TARGET_TRIPLE} CACHE STRING "Target triple.")
 
+if (${LIBCXX_CXX_ABI} STREQUAL "libsupc++")
+  set(LIBCXX_LIBSUPCXX_INCLUDE_PATHS "" CACHE STRINGS
+      "Paths to libsupc++ include directories. Separate by system separator")
+  set(LIBCXX_CXX_ABI_LIBRARIES stdc++)
+  set(LIBCXX_LIBSUPCXX_FILES
+      cxxabi.h
+      bits/c++config.h
+      bits/os_defines.h
+      bits/cpu_defines.h
+      bits/cxxabi_tweaks.h
+      bits/cxxabi_forced.h
+      )
+  set(LIBCXX_LIBSUPCXX_FILE_PATHS)
+  foreach(path ${LIBCXX_LIBSUPCXX_FILES})
+    set(found FALSE)
+    foreach(incpath ${LIBCXX_LIBSUPCXX_INCLUDE_PATHS})
+      if (EXISTS "${incpath}/${path}")
+        set(found TRUE)
+        get_filename_component(dstdir ${path} PATH)
+        get_filename_component(file ${path} NAME)
+        add_custom_command(
+          OUTPUT "${CMAKE_BINARY_DIR}/include/${dstdir}/${file}"
+          COMMAND ${CMAKE_COMMAND} -E copy_if_different
+                    "${incpath}/${path}"
+                    "${CMAKE_BINARY_DIR}/include/${dstdir}"
+          MAIN_DEPENDENCY "${incpath}/${path}"
+          )
+        list(APPEND LIBCXX_CXX_ABI_DEPS
+                    "${CMAKE_BINARY_DIR}/include/${dstdir}/${file}")
+      endif()
+    endforeach()
+    if (NOT found)
+      message(FATAL_ERROR "Failed to find ${path}")
+    endif()
+  endforeach()
+  add_custom_target(supcxx_headers DEPENDS ${LIBCXX_CXX_ABI_DEPS})
+  set(LIBCXX_CXX_ABI_DEPS supcxx_headers)
+  include_directories("${CMAKE_BINARY_DIR}/include")
+  install(DIRECTORY "${CMAKE_BINARY_DIR}/include/"
+    DESTINATION include/c++/v1
+    FILES_MATCHING
+    PATTERN "*"
+    )
+elseif (${LIBCXX_CXX_ABI} NOT STREQUAL "none")
+  message(FATAL_ERROR
+          "Currently only none and libsupc++ are supported for c++ abi.")
+endif ()
+
 # Configure compiler.
 include(config-ix)
 
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 0418b1c91..e0f94ca67 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -31,7 +31,10 @@ else()
     )
 endif()
 
+add_dependencies(cxx ${LIBCXX_CXX_ABI_DEPS})
+
 # Generate library list.
+set(libraries ${LIBCXX_CXX_ABI_LIBRARIES})
 append_if(libraries LIBCXX_HAS_PTHREAD_LIB pthread)
 append_if(libraries LIBCXX_HAS_C_LIB c)
 append_if(libraries LIBCXX_HAS_M_LIB m)
diff --git a/src/exception.cpp b/src/exception.cpp
index 0dbb6604a..f5e6d2259 100644
--- a/src/exception.cpp
+++ b/src/exception.cpp
@@ -41,7 +41,7 @@
 namespace std
 {
 
-#if !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION)
+#if !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION) && !defined(__GLIBCXX__)
 
 // libcxxrt provides implementations of these functions itself.
 unexpected_handler
@@ -99,7 +99,7 @@ terminate() _NOEXCEPT
 }
 #endif // !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION)
 
-#ifndef LIBCXXRT
+#if !defined(LIBCXXRT) && !defined(__GLIBCXX__)
 bool uncaught_exception() _NOEXCEPT
 {
 #if __APPLE__ || defined(_LIBCPPABI_VERSION)
@@ -124,7 +124,7 @@ const char* exception::what() const _NOEXCEPT
 
 #endif  // _LIBCPPABI_VERSION
 #endif //LIBCXXRT
-#ifndef _LIBCPPABI_VERSION
+#if !defined(_LIBCPPABI_VERSION) && !defined(__GLIBCXX__)
 
 bad_exception::~bad_exception() _NOEXCEPT
 {