wasmer: support zig 0.13.0

Author: Afirium

build.zig

@@ -0,0 +1,73 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) !void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const build_examples_option = b.option(bool, "examples", "Build example files") orelse false;
+
+    const run_step = b.step("run", "Run the app");
+
+    const wasmer_module = b.addModule("wasmer", .{
+        .root_source_file = b.path("src/wasmer.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    if (build_examples_option) {
+        var examples_dir = try std.fs.cwd().openDir("examples", .{ .iterate = true });
+        defer examples_dir.close();
+
+        var examples_dir_iter = examples_dir.iterate();
+
+        while (try examples_dir_iter.next()) |entry| {
+            if (entry.kind == .file and std.mem.endsWith(u8, entry.name, ".zig")) {
+                var buffer_exe_path = std.ArrayList(u8).init(b.allocator);
+                const exe_name = entry.name[0 .. entry.name.len - 4];
+
+                try buffer_exe_path.appendSlice("examples/");
+                try buffer_exe_path.appendSlice(entry.name);
+
+                const exe_path = try buffer_exe_path.toOwnedSlice();
+
+                const example_exe = b.addExecutable(.{
+                    .name = exe_name,
+                    .root_source_file = b.path(exe_path),
+                    .target = target,
+                    .optimize = optimize,
+                    .link_libc = true,
+                });
+
+                example_exe.root_module.addImport("wasmer", wasmer_module);
+                example_exe.root_module.addLibraryPath(.{ .cwd_relative = "/home/afirium/.wasmer/lib" });
+                example_exe.root_module.linkSystemLibrary("wasmer", .{});
+
+                b.installArtifact(example_exe);
+                const run_example_cmd = b.addRunArtifact(example_exe);
+                run_example_cmd.step.dependOn(b.getInstallStep());
+
+                run_step.dependOn(&run_example_cmd.step);
+            }
+        }
+    }
+
+    // Creates a step for unit testing. This only builds the test executable
+    // but does not run it.
+    const wasmer_unit_tests = b.addTest(.{
+        .root_source_file = b.path("src/wasmer.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    wasmer_unit_tests.linkLibC();
+    wasmer_unit_tests.addLibraryPath(.{ .cwd_relative = "/home/afirium/.wasmer/lib" });
+    wasmer_unit_tests.linkSystemLibrary("wasmer");
+
+    const run_wasmer_unit_tests = b.addRunArtifact(wasmer_unit_tests);
+
+    // Similar to creating the run step earlier, this exposes a `test` step to
+    // the `zig build --help` menu, providing a way for the user to request
+    // running the unit tests.
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_wasmer_unit_tests.step);
+}