Revert "make a .rsp file for zig clang"

This reverts commit 9db2934.

It's not OK to call `realpath` in the compiler.

Reopens #12419

Author: andrewrk

src/Compilation.zig

@@ -7,9 +7,6 @@ const Allocator = std.mem.Allocator;
 const assert = std.debug.assert;
 const log = std.log.scoped(.compilation);
 const Target = std.Target;
-const ArrayList = std.ArrayList;
-const Sha256 = std.crypto.hash.sha2.Sha256;
-const fs = std.fs;
 
 const Value = @import("value.zig").Value;
 const Type = @import("type.zig").Type;
@@ -3970,70 +3967,6 @@ fn updateCObject(comp: *Compilation, c_object: *CObject, c_obj_prog_node: *std.P
             }
         }
 
-        // Windows has an argument length limit of 32,766 characters, macOS 262,144 and Linux
-        // 2,097,152. If our args exceed 30 KiB, we instead write them to a "response file" and
-        // pass that to zig, e.g. via 'zig build-lib @args.rsp'
-        // See @file syntax here: https://gcc.gnu.org/onlinedocs/gcc/Overall-Options.html
-        var args_length: usize = 0;
-        for (argv.items) |arg| {
-            args_length += arg.len + 1; // +1 to account for null terminator
-        }
-        if (args_length >= 30 * 1024) {
-            const allocator = comp.gpa;
-            const input_args = argv.items[2..];
-            const output_dir = comp.local_cache_directory;
-
-            var args_arena = std.heap.ArenaAllocator.init(allocator);
-            defer args_arena.deinit();
-
-            const args_to_escape = input_args;
-            var escaped_args = try ArrayList([]const u8).initCapacity(args_arena.allocator(), args_to_escape.len);
-
-            arg_blk: for (args_to_escape) |arg| {
-                for (arg) |c, arg_idx| {
-                    if (c == '\\' or c == '"') {
-                        // Slow path for arguments that need to be escaped. We'll need to allocate and copy
-                        var escaped = try ArrayList(u8).initCapacity(args_arena.allocator(), arg.len + 1);
-                        const writer = escaped.writer();
-                        writer.writeAll(arg[0..arg_idx]) catch unreachable;
-                        for (arg[arg_idx..]) |to_escape| {
-                            if (to_escape == '\\' or to_escape == '"') try writer.writeByte('\\');
-                            try writer.writeByte(to_escape);
-                        }
-                        escaped_args.appendAssumeCapacity(escaped.items);
-                        continue :arg_blk;
-                    }
-                }
-                escaped_args.appendAssumeCapacity(arg); // no escaping needed so just use original argument
-            }
-
-            const partially_quoted = try std.mem.join(allocator, "\" \"", escaped_args.items);
-            const args = try std.mem.concat(allocator, u8, &[_][]const u8{ "\"", partially_quoted, "\"" });
-
-            // Write the args to zig-cache/args/<SHA256 hash of args> to avoid conflicts with
-            // other zig build commands running in parallel.
-
-            var args_hash: [Sha256.digest_length]u8 = undefined;
-            Sha256.hash(args, &args_hash, .{});
-            var args_hex_hash: [Sha256.digest_length * 2]u8 = undefined;
-            _ = try std.fmt.bufPrint(
-                &args_hex_hash,
-                "{s}",
-                .{std.fmt.fmtSliceHexLower(&args_hash)},
-            );
-
-            const args_dir = "args";
-            try output_dir.handle.makePath(args_dir);
-            const args_file = try fs.path.join(allocator, &[_][]const u8{
-                args_dir, args_hex_hash[0..],
-            });
-            try output_dir.handle.writeFile(args_file, args);
-            const args_file_path = try output_dir.handle.realpathAlloc(allocator, args_file);
-
-            argv.shrinkRetainingCapacity(2);
-            try argv.append(try std.mem.concat(allocator, u8, &[_][]const u8{ "@", args_file_path }));
-        }
-
         if (comp.verbose_cc) {
             dump_argv(argv.items);
         }

test/standalone.zig

@@ -52,7 +52,10 @@ pub fn addCases(cases: *tests.StandaloneContext) void {
     if (builtin.zig_backend == .stage1) { // https://github.com/ziglang/zig/issues/12194
         cases.addBuildFile("test/standalone/issue_9812/build.zig", .{});
     }
-    cases.addBuildFile("test/standalone/issue_11595/build.zig", .{});
+    if (builtin.os.tag != .windows) {
+        // https://github.com/ziglang/zig/issues/12419
+        cases.addBuildFile("test/standalone/issue_11595/build.zig", .{});
+    }
 
     if (builtin.os.tag != .wasi and
         // https://github.com/ziglang/zig/issues/13550