std.Target: Remove ObjectFormat.nvptx (and associated linker code).

Textual PTX is just assembly language like any other. And if we do ever add
support for emitting PTX object files after reverse engineering the bytecode
format, we'd be emitting ELF files like the CUDA toolchain. So there's really no
need for a special ObjectFormat tag here, nor linker code that treats it as a
distinct format.

Author: alexrp

CMakeLists.txt

@@ -640,7 +640,6 @@ set(ZIG_STAGE2_SOURCES
     src/link/MachO/synthetic.zig
     src/link/MachO/Thunk.zig
     src/link/MachO/uuid.zig
-    src/link/NvPtx.zig
     src/link/Plan9.zig
     src/link/Plan9/aout.zig
     src/link/SpirV.zig

lib/std/Target.zig

@@ -1017,8 +1017,6 @@ pub const ObjectFormat = enum {
     hex,
     /// The Mach object format used by macOS and other Apple platforms.
     macho,
-    /// Nvidia's PTX (Parallel Thread Execution) assembly language.
-    nvptx,
     /// The a.out format used by Plan 9 from Bell Labs.
     plan9,
     /// Machine code with no metadata.
@@ -1039,7 +1037,6 @@ pub const ObjectFormat = enum {
             .coff => ".obj",
             .elf, .goff, .macho, .wasm, .xcoff => ".o",
             .hex => ".ihex",
-            .nvptx => ".ptx",
             .plan9 => arch.plan9Ext(),
             .raw => ".bin",
             .spirv => ".spv",
@@ -1054,7 +1051,6 @@ pub const ObjectFormat = enum {
             .uefi, .windows => .coff,
             .zos => .goff,
             else => switch (arch) {
-                .nvptx, .nvptx64 => .nvptx,
                 .spirv, .spirv32, .spirv64 => .spirv,
                 .wasm32, .wasm64 => .wasm,
                 else => .elf,

lib/std/zig.zig

@@ -232,7 +232,6 @@ pub fn binNameAlloc(allocator: Allocator, options: BinNameOptions) error{OutOfMe
                 t.libPrefix(), root_name,
             }),
         },
-        .nvptx => return std.fmt.allocPrint(allocator, "{s}.ptx", .{root_name}),
     }
 }
 

src/Compilation/Config.zig

@@ -434,7 +434,7 @@ pub fn resolve(options: Options) ResolveError!Config {
                 .windows, .uefi => .code_view,
                 else => .{ .dwarf = .@"32" },
             },
-            .spirv, .nvptx, .hex, .raw, .plan9 => .strip,
+            .spirv, .hex, .raw, .plan9 => .strip,
         };
     };
 

src/codegen.zig

@@ -666,7 +666,6 @@ fn lowerUavRef(
     switch (lf.tag) {
         .c => unreachable,
         .spirv => unreachable,
-        .nvptx => unreachable,
         .wasm => {
             dev.check(link.File.Tag.wasm.devFeature());
             const wasm = lf.cast(.wasm).?;
@@ -739,7 +738,6 @@ fn lowerNavRef(
     switch (lf.tag) {
         .c => unreachable,
         .spirv => unreachable,
-        .nvptx => unreachable,
         .wasm => {
             dev.check(link.File.Tag.wasm.devFeature());
             const wasm = lf.cast(.wasm).?;

src/dev.zig

@@ -81,7 +81,6 @@ pub const Env = enum {
                 .wasm_linker,
                 .spirv_linker,
                 .plan9_linker,
-                .nvptx_linker,
                 .goff_linker,
                 .xcoff_linker,
                 => true,
@@ -229,7 +228,6 @@ pub const Feature = enum {
     wasm_linker,
     spirv_linker,
     plan9_linker,
-    nvptx_linker,
     goff_linker,
     xcoff_linker,
 };

src/link.zig

@@ -597,7 +597,7 @@ pub const File = struct {
                     .mode = determineMode(use_lld, output_mode, link_mode),
                 });
             },
-            .c, .spirv, .nvptx => dev.checkAny(&.{ .c_linker, .spirv_linker, .nvptx_linker }),
+            .c, .spirv => dev.checkAny(&.{ .c_linker, .spirv_linker }),
         }
     }
 
@@ -670,7 +670,7 @@ pub const File = struct {
                     }
                 }
             },
-            .c, .spirv, .nvptx => dev.checkAny(&.{ .c_linker, .spirv_linker, .nvptx_linker }),
+            .c, .spirv => dev.checkAny(&.{ .c_linker, .spirv_linker }),
         }
     }
 
@@ -697,7 +697,6 @@ pub const File = struct {
             .plan9 => unreachable,
             .spirv => unreachable,
             .c => unreachable,
-            .nvptx => unreachable,
             inline else => |tag| {
                 dev.check(tag.devFeature());
                 return @as(*tag.Type(), @fieldParentPtr("base", base)).getGlobalSymbol(name, lib_name);
@@ -766,7 +765,7 @@ pub const File = struct {
         }
 
         switch (base.tag) {
-            .spirv, .nvptx => {},
+            .spirv => {},
             .goff, .xcoff => {},
             inline else => |tag| {
                 dev.check(tag.devFeature());
@@ -901,7 +900,6 @@ pub const File = struct {
         switch (base.tag) {
             .c => unreachable,
             .spirv => unreachable,
-            .nvptx => unreachable,
             .wasm => unreachable,
             .goff, .xcoff => unreachable,
             inline else => |tag| {
@@ -921,7 +919,6 @@ pub const File = struct {
         switch (base.tag) {
             .c => unreachable,
             .spirv => unreachable,
-            .nvptx => unreachable,
             .wasm => unreachable,
             .goff, .xcoff => unreachable,
             inline else => |tag| {
@@ -935,7 +932,6 @@ pub const File = struct {
         switch (base.tag) {
             .c => unreachable,
             .spirv => unreachable,
-            .nvptx => unreachable,
             .wasm => unreachable,
             .goff, .xcoff => unreachable,
             inline else => |tag| {
@@ -953,7 +949,6 @@ pub const File = struct {
         switch (base.tag) {
             .plan9,
             .spirv,
-            .nvptx,
             .goff,
             .xcoff,
             => {},
@@ -1251,7 +1246,6 @@ pub const File = struct {
         wasm,
         spirv,
         plan9,
-        nvptx,
         goff,
         xcoff,
 
@@ -1264,7 +1258,6 @@ pub const File = struct {
                 .wasm => Wasm,
                 .spirv => SpirV,
                 .plan9 => Plan9,
-                .nvptx => NvPtx,
                 .goff => Goff,
                 .xcoff => Xcoff,
             };
@@ -1279,7 +1272,6 @@ pub const File = struct {
                 .plan9 => .plan9,
                 .c => .c,
                 .spirv => .spirv,
-                .nvptx => .nvptx,
                 .goff => .goff,
                 .xcoff => .xcoff,
                 .hex => @panic("TODO implement hex object format"),
@@ -1386,7 +1378,6 @@ pub const File = struct {
     pub const MachO = @import("link/MachO.zig");
     pub const SpirV = @import("link/SpirV.zig");
     pub const Wasm = @import("link/Wasm.zig");
-    pub const NvPtx = @import("link/NvPtx.zig");
     pub const Goff = @import("link/Goff.zig");
     pub const Xcoff = @import("link/Xcoff.zig");
     pub const Dwarf = @import("link/Dwarf.zig");

src/link/NvPtx.zig

@@ -140,7 +140,6 @@ pub fn hasLlvmSupport(target: std.Target, ofmt: std.Target.ObjectFormat) bool {
         .goff,
         .hex,
         .macho,
-        .nvptx,
         .spirv,
         .raw,
         .wasm,