Merge pull request 'changed compat check to comptime' (#11) from fix_compat into main

Reviewed-on: https://codeberg.org/ziglings/exercises/pulls/11

build.zig

@@ -1,17 +1,43 @@
 const std = @import("std");
 const builtin = @import("builtin");
-const compat = @import("src/compat.zig");
 const tests = @import("test/tests.zig");
 
-const Build = compat.Build;
-const CompileStep = compat.build.CompileStep;
-const Step = compat.build.Step;
+const Build = std.Build;
+const CompileStep = Build.CompileStep;
+const Step = Build.Step;
 const Child = std.process.Child;
 
 const assert = std.debug.assert;
 const join = std.fs.path.join;
 const print = std.debug.print;
 
+// When changing this version, be sure to also update README.md in two places:
+//     1) Getting Started
+//     2) Version Changes
+comptime {
+    const required_zig = "0.11.0-dev.4246";
+    const current_zig = builtin.zig_version;
+    const min_zig = std.SemanticVersion.parse(required_zig) catch unreachable;
+    if (current_zig.order(min_zig) == .lt) {
+        const error_message =
+            \\Sorry, it looks like your version of zig is too old. :-(
+            \\
+            \\Ziglings requires development build
+            \\
+            \\{}
+            \\
+            \\or higher.
+            \\
+            \\Please download a development ("master") build from
+            \\
+            \\https://ziglang.org/download/
+            \\
+            \\
+        ;
+        @compileError(std.fmt.comptimePrint(error_message, .{min_zig}));
+    }
+}
+
 const Kind = enum {
     /// Run the artifact as a normal executable.
     exe,
@@ -93,7 +119,6 @@ pub const logo =
 ;
 
 pub fn build(b: *Build) !void {
-    if (!compat.is_compatible) compat.die();
     if (!validate_exercises()) std.os.exit(2);
 
     use_color_escapes = false;

src/compat.zig

@@ -1,65 +0,0 @@
-/// Compatibility support for very old versions of Zig and recent versions before
-/// commit efa25e7d5 (Merge pull request #14498 from ziglang/zig-build-api).
-///
-/// Versions of Zig from before 0.6.0 cannot do the version check and will just
-/// fail to compile, but 0.5.0 was a long time ago, it is unlikely that anyone
-/// who attempts these exercises is still using it.
-const std = @import("std");
-const builtin = @import("builtin");
-
-const debug = std.debug;
-
-// Very old versions of Zig used warn instead of print.
-const print = if (@hasDecl(debug, "print")) debug.print else debug.warn;
-
-// When changing this version, be sure to also update README.md in two places:
-//     1) Getting Started
-//     2) Version Changes
-const needed_version_str = "0.11.0-dev.4246";
-
-fn isCompatible() bool {
-    if (!@hasDecl(builtin, "zig_version") or !@hasDecl(std, "SemanticVersion")) {
-        return false;
-    }
-
-    const needed_version = std.SemanticVersion.parse(needed_version_str) catch unreachable;
-    const version = builtin.zig_version;
-    const order = version.order(needed_version);
-
-    return order != .lt;
-}
-
-pub fn die() noreturn {
-    const error_message =
-        \\ERROR: Sorry, it looks like your version of zig is too old. :-(
-        \\
-        \\Ziglings requires development build
-        \\
-        \\    {s}
-        \\
-        \\or higher. Please download a development ("master") build from
-        \\
-        \\    https://ziglang.org/download/
-        \\
-        \\
-    ;
-
-    print(error_message, .{needed_version_str});
-
-    // Use exit code 2, to differentiate from a normal Zig compiler error.
-    std.os.exit(2);
-}
-
-// A separate function is required because very old versions of Zig doesn't
-// support labeled block expressions.
-pub const is_compatible: bool = isCompatible();
-
-/// This is the type to be used only for the build function definition, since
-/// the type must be compatible with the build runner.
-///
-/// Don't use std.Build.Builder, since it is deprecated and may be removed in
-/// future.
-pub const Build = if (is_compatible) std.Build else std.build.Builder;
-
-/// This is the type to be used for accessing the build namespace.
-pub const build = if (is_compatible) std.Build else std.build;