Disable exception handling for LLDB.

[zturner]

Summary

Disables exception handling in LLDB, using appropriate compiler
flags depending on the platform. This is consistent with the build
of LLVM, should improve performance, and also removes a substantial number
of warnings from the Windows build.

[tfiala]

Doing a test build now.

[tfiala]

LGTM. Built fine on Ubuntu 12.04 x86_64 cmake/ninja. All tests pass.
MacOSX Xcode build unaffected verified.

[tfiala]

svn commit
Sending CMakeLists.txt
Transmitting file data .
Committed revision 209752.

CMakeLists.txt

 
 # Disable MSVC warnings
 if( MSVC )
   add_lldb_definitions(
     -wd4018 # Suppress 'warning C4018: '>=' : signed/unsigned mismatch'
     -wd4068 # Suppress 'warning C4068: unknown pragma'
     -wd4150 # Suppress 'warning C4150: deletion of pointer to incomplete type'
     -wd4521 # Suppress 'warning C4521: 'type' : multiple copy constructors specified'
+    -wd4530 # Suppress 'warning C4530: C++ exception handler used, but unwind semantics are not enabled.'
   )
 endif() 
 
 # If building on a 32-bit system, make sure off_t can store offsets > 2GB
 if( CMAKE_SIZEOF_VOID_P EQUAL 4 )
   add_lldb_definitions(
     -D_LARGEFILE_SOURCE
     -D_FILE_OFFSET_BITS=64
if (NOT LIBXML2_FOUND)
     find_package(LibXml2)
   endif ()
   list(APPEND system_libs xml2 ncurses panel)
   list(APPEND system_libs ${CARBON_LIBRARY} ${FOUNDATION_LIBRARY}
   ${CORE_FOUNDATION_LIBRARY} ${CORE_SERVICES_LIBRARY} ${SECURITY_LIBRARY}
   ${DEBUG_SYMBOLS_LIBRARY})
 endif()
 
+if(LLDB_REQUIRES_EH)
+  set(LLDB_REQUIRES_RTTI ON)
+else()
+  if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
+    set(LLDB_COMPILE_FLAGS "${LLDB_COMPILE_FLAGS} -fno-exceptions")
+  elseif(MSVC)
+    add_definitions( -D_HAS_EXCEPTIONS=0 )
+    set(LLDB_COMPILE_FLAGS "${LLDB_COMPILE_FLAGS} /EHs-c-")
+  endif()
+endif()
+
 # Disable RTTI by default
 if(NOT LLDB_REQUIRES_RTTI)
-  if (NOT MSVC)
-    if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU" OR
-        "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-      #gnu && clang compilers
-      set(LLDB_COMPILE_FLAGS "-fno-rtti")
-    endif() #GNU or CLANG
-  else()
-    #MSVC
-    set(LLDB_COMPILE_FLAGS "/GR-")
-  endif() #NOT MSVC
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LLDB_COMPILE_FLAGS}")
+  if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
+    set(LLDB_COMPILE_FLAGS "${LLDB_COMPILE_FLAGS} -fno-rtti")
+  elseif(MSVC)
+    set(LLDB_COMPILE_FLAGS "${LLDB_COMPILE_FLAGS} /GR-")
   endif()
+endif()
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LLDB_COMPILE_FLAGS}")
 
 #add_subdirectory(include)
 add_subdirectory(docs)
 if (NOT CMAKE_SYSTEM_NAME MATCHES "Windows")
   add_subdirectory(scripts)
 endif()
 add_subdirectory(source)
 add_subdirectory(test)
 add_subdirectory(tools)