Disable cfi sanitizer

This has caused a number of problems, so is disabled by default now. It
can be re-enabled using the cmake var `UR_USE_CFI`.

Issues are tracked internally by Intel as CMPLRLLVM-63862.

Author: RossBrunton

CMakeLists.txt

@@ -27,7 +27,7 @@ option(UR_USE_ASAN "enable AddressSanitizer" OFF)
 option(UR_USE_UBSAN "enable UndefinedBehaviorSanitizer" OFF)
 option(UR_USE_MSAN "enable MemorySanitizer" OFF)
 option(UR_USE_TSAN "enable ThreadSanitizer" OFF)
-option(UR_USE_CFI "enable Control Flow Integrity checks (requires clang and implies -flto)" ON)
+option(UR_USE_CFI "enable Control Flow Integrity checks (requires clang and implies -flto)" OFF)
 option(UR_ENABLE_TRACING "enable api tracing through xpti" OFF)
 option(UR_ENABLE_SANITIZER "enable device sanitizer" ON)
 option(UR_ENABLE_SYMBOLIZER "enable symoblizer for sanitizer" OFF)

README.md

@@ -130,7 +130,7 @@ List of options provided by CMake:
 | UR_USE_TSAN | Enable ThreadSanitizer | ON/OFF | OFF |
 | UR_USE_UBSAN | Enable UndefinedBehavior Sanitizer | ON/OFF | OFF |
 | UR_USE_MSAN | Enable MemorySanitizer (clang only) | ON/OFF | OFF |
-| UR_USE_CFI | Enable Control Flow Integrity checks (clang only, also enables lto) | ON/OFF | ON |
+| UR_USE_CFI | Enable Control Flow Integrity checks (clang only, also enables lto) | ON/OFF | OFF |
 | UR_ENABLE_TRACING | Enable XPTI-based tracing layer | ON/OFF | OFF |
 | UR_ENABLE_SANITIZER | Enable device sanitizer layer | ON/OFF | ON |
 | UR_CONFORMANCE_TARGET_TRIPLES | SYCL triples to build CTS device binaries for | Comma-separated list | spir64 |