std.os.linux.AUDIT.ARCH needs to be rewritten

[alexrp]

zig/lib/std/os/linux.zig

Lines 7271 to 7331 in eac7fd4

	// TODO: Add the rest of the AUDIT defines?
	pub const AUDIT = struct {
	pub const ARCH = enum(u32) {
	const @"64BIT" = 0x80000000;
	const LE = 0x40000000;
	pub const current: AUDIT.ARCH = switch (native_arch) {
	.x86 => .X86,
	.x86_64 => .X86_64,
	.aarch64 => .AARCH64,
	.arm, .thumb => .ARM,
	.riscv64 => .RISCV64,
	.sparc64 => .SPARC64,
	.mips => .MIPS,
	.mipsel => .MIPSEL,
	.powerpc => .PPC,
	.powerpc64 => .PPC64,
	.powerpc64le => .PPC64LE,
	else => @compileError("unsupported architecture"),
	};
	AARCH64 = toAudit(.aarch64),
	ARM = toAudit(.arm),
	ARMEB = toAudit(.armeb),
	CSKY = toAudit(.csky),
	HEXAGON = @intFromEnum(std.elf.EM.HEXAGON),
	X86 = toAudit(.x86),
	M68K = toAudit(.m68k),
	MIPS = toAudit(.mips),
	MIPSEL = toAudit(.mips) | LE,
	MIPS64 = toAudit(.mips64),
	MIPSEL64 = toAudit(.mips64) | LE,
	PPC = toAudit(.powerpc),
	PPC64 = toAudit(.powerpc64),
	PPC64LE = toAudit(.powerpc64le),
	RISCV32 = toAudit(.riscv32),
	RISCV64 = toAudit(.riscv64),
	S390X = toAudit(.s390x),
	SPARC = toAudit(.sparc),
	SPARC64 = toAudit(.sparc64),
	X86_64 = toAudit(.x86_64),
	fn toAudit(arch: std.Target.Cpu.Arch) u32 {
	var res: u32 = @intFromEnum(arch.toElfMachine());
	if (arch.endian() == .little) res |= LE;
	switch (arch) {
	.aarch64,
	.mips64,
	.mips64el,
	.powerpc64,
	.powerpc64le,
	.riscv64,
	.sparc64,
	.x86_64,
	=> res |= @"64BIT",
	else => {},
	}
	return res;
	}
	};
	};

There are two problems with this code:

• Implementing the bindings in terms of std.Target.Cpu.Arch mapped to std.elf.EM is too clever. There is not a 1:1 mapping here; it would at least need to take an std.Target.Abi too. But really, just use std.elf.EM.
• Detection for current is broken for cases where the ABI affects the decision. It's also missing some architectures.