std.Target: remove Abi.code16

This functionality -- if it's actually needed -- can be reintroduced through some other mechanism. An ABI is clearly not the right way to represent it. closes #25918

Author: alexrp

lib/compiler/aro/aro/Target.zig

@@ -1258,7 +1258,6 @@ pub fn toLLVMTriple(target: *const Target, buf: []u8) []const u8 {
 
  .android => "android",
  .androideabi => "androideabi",
- .code16 => "code16",
  .eabi => "eabi",
  .eabihf => "eabihf",
  .gnu => "gnu",
@@ -1630,11 +1629,11 @@ test parseAbi {
  try testing.expect(query.abi == .android);
  try testing.expectEqual(query.android_api_level, 17);
 
- try testing.expectError(error.InvalidAbiVersion, parseAbi(&query, "code162", null));
- try testing.expect(query.abi == .code16);
+ try testing.expectError(error.InvalidAbiVersion, parseAbi(&query, "ilp322", null));
+ try testing.expect(query.abi == .ilp32);
 
- try testing.expectError(error.InvalidAbiVersion, parseAbi(&query, "code16.2", null));
- try testing.expect(query.abi == .code16);
+ try testing.expectError(error.InvalidAbiVersion, parseAbi(&query, "ilp32.2", null));
+ try testing.expect(query.abi == .ilp32);
 }
 
 /// Parse OS string with common aliases in `<os>(.?<version>(...<version>))?` format.

lib/std/Target.zig

@@ -746,7 +746,6 @@ pub const Abi = enum {
  gnuf32,
  gnusf,
  gnux32,
- code16,
  eabi,
  eabihf,
  ilp32,

lib/std/zig/LibCDirs.zig

@@ -254,7 +254,6 @@ fn libCGenericName(target: *const std.Target) [:0]const u8 {
  .ohos,
  .ohoseabi,
  => return "musl",
- .code16,
  .eabi,
  .eabihf,
  .ilp32,

lib/std/zig/system.zig

@@ -380,38 +380,27 @@ pub fn resolveTargetQuery(io: Io, query: Target.Query) DetectError!Target {
 
  // For x86, we need to populate some CPU feature flags depending on architecture
  // and mode:
- // * 16bit_mode => if the abi is code16
+ // * 16bit_mode => if the arch is x86_16
  // * 32bit_mode => if the arch is x86
  // However, the "mode" flags can be used as overrides, so if the user explicitly
  // sets one of them, that takes precedence.
  switch (query_cpu_arch) {
  .x86_16 => {
- cpu.features.addFeature(
- @intFromEnum(Target.x86.Feature.@"16bit_mode"),
- );
+ cpu.features.addFeature(@intFromEnum(Target.x86.Feature.@"16bit_mode"));
  },
  .x86 => {
  if (!Target.x86.featureSetHasAny(query.cpu_features_add, .{
  .@"16bit_mode", .@"32bit_mode",
  })) {
- switch (query_abi) {
- .code16 => cpu.features.addFeature(
- @intFromEnum(Target.x86.Feature.@"16bit_mode"),
- ),
- else => cpu.features.addFeature(
- @intFromEnum(Target.x86.Feature.@"32bit_mode"),
- ),
- }
+ cpu.features.addFeature(@intFromEnum(Target.x86.Feature.@"32bit_mode"));
  }
  },
  .arm, .armeb => {
  // XXX What do we do if the target has the noarm feature?
  // What do we do if the user specifies +thumb_mode?
  },
  .thumb, .thumbeb => {
- cpu.features.addFeature(
- @intFromEnum(Target.arm.Feature.thumb_mode),
- );
+ cpu.features.addFeature(@intFromEnum(Target.arm.Feature.thumb_mode));
  },
  else => {},
  }

src/codegen/llvm.zig

@@ -277,7 +277,6 @@ pub fn targetTriple(allocator: Allocator, target: *const std.Target) ![]const u8
  .gnusf => "gnusf",
  .gnux32 => "gnux32",
  .ilp32 => "unknown",
- .code16 => "code16",
  .eabi => "eabi",
  .eabihf => "eabihf",
  .android => "android",