[Bug 207898] kernel linker behaves differently on amd64 vs. i386

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207898

            Bug ID: 207898
           Summary: kernel linker behaves differently on amd64 vs. i386
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: truckman at FreeBSD.org

Created attachment 168000
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168000&action=edit
example kernel module source that illustrates the differing kernel linker
behavior on amd64 vs i386

If one source file in a kernel module defines a symbol as static and another
declares it as extern, the module fails to load on i386, with the kernel
logging a message about the symbol being undefined.  I believe this is the
correct behavior.  On amd64, the module loads and the code in the second source
file is able to access the static variable in the first source file.

In the attached example, the main module source file is able to access static
character arrays in the other source file when loaded on an amd64 machine.

The behavior is the same on FreeBSD 10.1 through recent 11.0-CURRENT.  FreeBSD
9.x has not been tested.

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