Only support LLVM 16 (#168)

Author: dpaoliello

CMakeLists.txt

@@ -15,10 +15,8 @@ if (NOT DEFINED LLVM_VERSION_MAJOR)
   set (CMAKE_CXX_STANDARD 17)
 endif()
 
-if(LLVM_VERSION_MAJOR LESS 8)
-  message(FATAL_ERROR "This project isn't buldable with LLVM < 8.0.0.")
-elseif(LLVM_VERSION_MAJOR LESS 10)
-  message(WARNING "Building with LLVM < 10.0.0 is at your own risk.")
+if(NOT LLVM_VERSION_MAJOR EQUAL 16)
+  message(FATAL_ERROR "This project only supports LLVM 16. For older versions of LLVM please check https://github.com/JuliaHubOSS/llvm-cbe/tags")
 endif()
 
 add_subdirectory(lib)

README.md

@@ -6,7 +6,7 @@ This LLVM C backend has been resurrected by Julia Computing with various improve
 Installation instructions
 =========================
 
-This version of the LLVM C backend works with LLVM 10.0 and 16.0, other version of LLVM may work but are untested.
+This version of the LLVM C backend works with LLVM 16, for older versions please check the [tags](https://github.com/JuliaHubOSS/llvm-cbe/tags).
 
 Step 1: Installing LLVM
 =======================