[llvm-bugs] [Bug 38922] New: XRay attributes don't get emitted when -fno-xray-instrument is provided

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https://bugs.llvm.org/show_bug.cgi?id=38922

            Bug ID: 38922
           Summary: XRay attributes don't get emitted when
                    -fno-xray-instrument is provided
           Product: XRay
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Clang
          Assignee: dberris at google.com
          Reporter: dberris at google.com
                CC: llvm-bugs at lists.llvm.org

This causes issues when doing thinlto builds, where one module is built with
-fno-xray-instrument while another is built with -fxray-instrument, then at
link-time the re-lowering of functions that should have been marked "never
instrument" may suddenly get instrumented. Instead of deciding at the front-end
whether to emit the attribute, we should instead handle the attribute in LLVM
IR properly in the back-end if we're emitting XRay instrumented binaries.

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