std.Target: Remove Abi.gnuilp32.

* This has not seen meaningful development for about a decade.
* The Linux kernel port was never upstreamed.
* The glibc port was never upstreamed.
* GCC 15.1 recently deprecated support it.

It may still make sense to support an ILP32 ABI on AArch64 more broadly (which
we already have the Abi.ilp32 tag for), but, to the extent that it even existed
in any "official" sense, the *GNU* ILP32 ABI is certainly dead.

lib/compiler/aro/aro/target.zig

@@ -687,7 +687,6 @@ pub fn toLLVMTriple(target: std.Target, buf: []u8) []const u8 {
         .gnuf32 => "gnuf32",
         .gnusf => "gnusf",
         .gnux32 => "gnux32",
-        .gnuilp32 => "gnu_ilp32",
         .code16 => "code16",
         .eabi => "eabi",
         .eabihf => "eabihf",

lib/std/Target.zig

@@ -763,7 +763,6 @@ pub const Abi = enum {
     gnuf32,
     gnusf,
     gnux32,
-    gnuilp32,
     code16,
     eabi,
     eabihf,
@@ -938,7 +937,6 @@ pub const Abi = enum {
             .gnuf32,
             .gnusf,
             .gnux32,
-            .gnuilp32,
             => true,
             else => false,
         };
@@ -2205,14 +2203,7 @@ pub const DynamicLinker = struct {
             .hurd => switch (cpu.arch) {
                 .aarch64,
                 .aarch64_be,
-                => |arch| initFmt("/lib/ld-{s}{s}.so.1", .{
-                    @tagName(arch),
-                    switch (abi) {
-                        .gnu => "",
-                        .gnuilp32 => "_ilp32",
-                        else => return none,
-                    },
-                }),
+                => |arch| if (abi == .gnu) initFmt("/lib/ld-{s}.so.1", .{@tagName(arch)}) else none,
 
                 .x86 => if (abi == .gnu) init("/lib/ld.so.1") else none,
                 .x86_64 => initFmt("/lib/ld-{s}.so.1", .{switch (abi) {
@@ -2344,14 +2335,7 @@ pub const DynamicLinker = struct {
 
                     .aarch64,
                     .aarch64_be,
-                    => |arch| initFmt("/lib/ld-linux-{s}{s}.so.1", .{
-                        @tagName(arch),
-                        switch (abi) {
-                            .gnu => "",
-                            .gnuilp32 => "_ilp32",
-                            else => return none,
-                        },
-                    }),
+                    => |arch| if (abi == .gnu) initFmt("/lib/ld-linux-{s}.so.1", .{@tagName(arch)}) else none,
 
                     // TODO: `-be` architecture support.
                     .csky => initFmt("/lib/ld-linux-cskyv2{s}.so.1", .{switch (abi) {
@@ -2585,7 +2569,7 @@ pub fn standardDynamicLinkerPath(target: Target) DynamicLinker {
 
 pub fn ptrBitWidth_cpu_abi(cpu: Cpu, abi: Abi) u16 {
     switch (abi) {
-        .gnux32, .muslx32, .gnuabin32, .muslabin32, .gnuilp32, .ilp32 => return 32,
+        .gnux32, .muslx32, .gnuabin32, .muslabin32, .ilp32 => return 32,
         .gnuabi64, .muslabi64 => return 64,
         else => {},
     }
@@ -2979,7 +2963,7 @@ pub fn cTypeBitSize(target: Target, c_type: CType) u16 {
                 .long, .ulong => return 32,
                 .longlong, .ulonglong, .double => return 64,
                 .longdouble => switch (target.abi) {
-                    .gnu, .gnuilp32, .ilp32, .cygnus => return 80,
+                    .gnu, .ilp32, .cygnus => return 80,
                     else => return 64,
                 },
             },
@@ -2993,7 +2977,7 @@ pub fn cTypeBitSize(target: Target, c_type: CType) u16 {
                 },
                 .longlong, .ulonglong, .double => return 64,
                 .longdouble => switch (target.abi) {
-                    .gnu, .gnuilp32, .ilp32, .cygnus => return 80,
+                    .gnu, .ilp32, .cygnus => return 80,
                     else => return 64,
                 },
             },
@@ -3091,7 +3075,7 @@ pub fn cTypeAlignment(target: Target, c_type: CType) u16 {
             .windows, .uefi => switch (c_type) {
                 .longlong, .ulonglong, .double => return 8,
                 .longdouble => switch (target.abi) {
-                    .gnu, .gnuilp32, .ilp32, .cygnus => return 4,
+                    .gnu, .ilp32, .cygnus => return 4,
                     else => return 8,
                 },
                 else => {},
@@ -3192,7 +3176,7 @@ pub fn cTypePreferredAlignment(target: Target, c_type: CType) u16 {
             },
             .windows, .uefi => switch (c_type) {
                 .longdouble => switch (target.abi) {
-                    .gnu, .gnuilp32, .ilp32, .cygnus => return 4,
+                    .gnu, .ilp32, .cygnus => return 4,
                     else => return 8,
                 },
                 else => {},

lib/std/zig/LibCDirs.zig

@@ -229,7 +229,6 @@ fn libCGenericName(target: std.Target) [:0]const u8 {
         .gnuf32,
         .gnusf,
         .gnux32,
-        .gnuilp32,
         => return "glibc",
         .musl,
         .muslabin32,

src/codegen/llvm.zig

@@ -259,7 +259,6 @@ pub fn targetTriple(allocator: Allocator, target: std.Target) ![]const u8 {
         .gnuf32 => "gnuf32",
         .gnusf => "gnusf",
         .gnux32 => "gnux32",
-        .gnuilp32 => "gnu_ilp32",
         .code16 => "code16",
         .eabi => "eabi",
         .eabihf => "eabihf",