allow LLVM to be built without support for exceptions

This makes it easier to link against OS builds like Debian's

Author: nunoplopes

CMakeLists.txt

@@ -180,10 +180,6 @@ if (BUILD_LLVM_UTILS OR BUILD_TV)
     message(FATAL_ERROR "LLVM must be built with '-DLLVM_ENABLE_RTTI=ON'")
   endif()
 
-  if (NOT LLVM_ENABLE_EH)
-    message(FATAL_ERROR "LLVM must be built with '-DLLVM_ENABLE_EH=ON'")
-  endif()
-
   list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_DIR}")
   include(AddLLVM)
 
@@ -206,14 +202,17 @@ if (BUILD_LLVM_UTILS OR BUILD_TV)
   add_llvm_executable(alive-tv
     "tools/alive-tv.cpp"
   )
+  target_compile_options(alive-tv PRIVATE -fexceptions)
 
   add_llvm_executable(quick-fuzz
     "tools/quick-fuzz.cpp"
   )
+  target_compile_options(quick-fuzz PRIVATE -fexceptions)
 
   add_llvm_executable(alive-exec
     "tools/alive-exec.cpp"
   )
+  target_compile_options(alive-exec PRIVATE -fexceptions)
 
 else()
   set(LLVM_UTIL_SRCS "")

README.md

@@ -99,7 +99,7 @@ actual location to that in the resultant error message may help.
 cd $LLVM2_HOME
 mkdir build
 cd build
-cmake -GNinja -DLLVM_ENABLE_RTTI=ON -DLLVM_ENABLE_EH=ON -DBUILD_SHARED_LIBS=ON -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PROJECTS="llvm;clang" ../llvm
+cmake -GNinja -DLLVM_ENABLE_RTTI=ON -DBUILD_SHARED_LIBS=ON -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PROJECTS="llvm;clang" ../llvm
 ninja
 ```
 

tv/CMakeLists.txt

@@ -22,6 +22,7 @@ configure_file(
 )
 
 target_link_libraries(tv PRIVATE ${ALIVE_LIBS_LLVM} ${Z3_LIBRARIES} ${HIREDIS_LIBRARIES})
+target_compile_options(tv PRIVATE -fexceptions)
 
 if(APPLE)
     set_target_properties(tv PROPERTIES