[PATCH] D26597: [XRay][compiler-rt] Disable XRay instrumentation of the XRay runtime.

[Dean Michael Berris via llvm-commits]

dberris created this revision.
dberris added reviewers: majnemer, rSerge, echristo.
dberris added a subscriber: llvm-commits.
Herald added subscribers: mgorny, mehdi_amini.

Adds a CMake check for whether the compiler used to build the XRay
library supports XRay-instrumentation. If the compiler we're using does
support the `-fxray-instrument` flag (i.e. recently-built Clang), we
define the XRAY_NEVER_INSTRUMENT macro that then makes sure that the
XRay runtime functions never get XRay-instrumented.

This prevents potential weirdness involved with building the XRay
library with a Clang that supports XRay-instrumentation, and is
attempting to XRay-instrument the build of compiler-rt.


https://reviews.llvm.org/D26597

Files:
  cmake/builtin-config-ix.cmake
  lib/xray/CMakeLists.txt
  lib/xray/xray_arm.cc
  lib/xray/xray_defs.h
  lib/xray/xray_flags.cc
  lib/xray/xray_init.cc
  lib/xray/xray_inmemory_log.cc
  lib/xray/xray_interface.cc
  lib/xray/xray_x86_64.cc

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