[llvm-bugs] [Bug 31177] New: PowerPC: soft-float commit breaks Linux kernel build

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https://llvm.org/bugs/show_bug.cgi?id=31177

            Bug ID: 31177
           Summary: PowerPC: soft-float commit breaks Linux kernel build
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: anton at samba.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The recent patch to enable soft-float support on PPC64 ("[PowerPC] Refactor
soft-float support, and enable PPC64 soft float") has broken Linux kernel
builds.

We want to avoid floating point in the kernel, but certain files want to be
built with vectorisation. One example is arch/powerpc/lib/xor_vmx.c.

The command line on these files contains the somewhat convoluted:

-msoft-float -mno-altivec -mno-vsx -maltivec -mabi=altivec

There are only two files in the kernel that use altivec in C, so perhaps we can
come up with a way to solve this in the kernel.

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