[llvm-bugs] [Bug 49035] New: fsanitize-coverage: Support function attribute no_sanitize("coverage")

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49035

            Bug ID: 49035
           Summary: fsanitize-coverage: Support function attribute
                    no_sanitize("coverage")
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: elver at google.com
                CC: dvyukov at google.com, glider at google.com,
                    htmldeveloper at gmail.com, kcc at google.com,
                    llvm-bugs at lists.llvm.org, mascasa at google.com,
                    neeilans at live.com, richard-llvm at metafoo.co.uk,
                    vitalybuka at google.com

Currently it is not possible to use no_sanitize("coverage") to disable coverage
instrumentation.

This came up in the context of constraints for certain Linux kernel functions:
https://lkml.kernel.org/r/CANpmjNPNa2f=kAF6c199oYVJ0iSyirQRGxeOBLxa9PmakSXRbA@mail.gmail.com
 --  The current workaround on x86 is to turn calls to __sanitizer_cov_* into
nops, however, for other architectures no such support is implemented but will
be required eventually.

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