Merge pull request #1468 from Sonicadvance1/experimental_libcxx

CMake: Adds experimental libc++ option

CMakeLists.txt

@@ -18,6 +18,7 @@ option(ENABLE_STATIC_PIE "Enables static-pie build" FALSE)
 option(ENABLE_JEMALLOC "Enables jemalloc allocator" TRUE)
 option(ENABLE_OFFLINE_TELEMETRY "Enables FEX offline telemetry" TRUE)
 option(ENABLE_COMPILE_TIME_TRACE "Enables time trace compile option" FALSE)
+option(ENABLE_LIBCXX "Enables LLVM libc++" FALSE)
 
 set (X86_C_COMPILER "x86_64-linux-gnu-gcc" CACHE STRING "c compiler for compiling x86 guest libs")
 set (X86_CXX_COMPILER "x86_64-linux-gnu-g++" CACHE STRING "c++ compiler for compiling x86 guest libs")
@@ -89,6 +90,12 @@ if (ENABLE_LLD)
   link_libraries(${LD_OVERRIDE})
 endif()
 
+if (ENABLE_LIBCXX)
+  message(WARNING "This is an unsupported configuration and should only be used for testing")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++")
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi")
+endif()
+
 if (NOT ENABLE_OFFLINE_TELEMETRY)
   # Disable FEX offline telemetry entirely if asked
   add_definitions(-DFEX_DISABLE_TELEMETRY=1)