[llvm-bugs] [Bug 27248] New: [PATCH] Make mcount function names match gcc on arm and arm64 Linux

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27248

            Bug ID: 27248
           Summary: [PATCH] Make mcount function names match gcc on arm
                    and arm64 Linux
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bero at linaro.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16175
  --> https://llvm.org/bugs/attachment.cgi?id=16175&action=edit
Adjust mcount name to match gcc

Currently, clang names the mcount function from -pg "_mcount" on PPC Linux and
"mcount" on any other Linux.

In gcc, this matches the behavior on PPC and x86 (both 32 and 64); but on
aarch64 the function is called "_mcount" and on arm32 it's called
"__gnu_mcount_nc".

This mismatch in naming causes the Linux kernel to miscompile for arm (32 and
64) if CONFIG_FUNCTION_TRACER is enabled.

The attached patch fixes this by matching the expected name of the mcount
function.

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