[Bug 215851] New: gcc 12.0.1 LATEST: -Wdangling-pointer= triggers

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https://bugzilla.kernel.org/show_bug.cgi?id=215851

            Bug ID: 215851
           Summary: gcc 12.0.1 LATEST: -Wdangling-pointer= triggers
           Product: File System
           Version: 2.5
    Kernel Version: 5.17.3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: XFS
          Assignee: filesystem_xfs@kernel-bugs.kernel.org
          Reporter: Erich.Loew@outlook.com
        Regression: No

Date:    20220415
Kernel:  5.17.3
Compiler gcc.12.0.1
File:    linux-5.17.3/fs/xfs/libxfs/xfs_attr_remote.c
Line:    141
Issue:   Linux kernel compiling enables all warnings, this has consequnces:
         -Wdangling-pointer= triggers because assignment of an address pointing
         to something inside of the local stack 
         of a function/method is returned to the caller.
         Doing such things is tricky but legal, however gcc 12.0.1 complains
         deeply on this.
         Mitigation: disabling with pragmas temporarily inlined the compiler
         triggered advises.
Interesting: clang-15.0.0 does not complain.
Remark: this occurence is reprsentative; the compiler warns at many places

To go pass through the compilation I added "-Wno-stringop-overread
-Wno-dangling-pointer -Wno-address -Wno-array-bounds -Wno-stringop-truncatio"
to the Makefile root file of the kernel tree.

This is not the cleanest approach but it helps for time being.

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