test/link: Add linker test for producers section

This also turns off non-debug modes for the bss linker tests for
Wasm. This is done as it's not required to guarantee to zero out
the bss section for non-debug modes.

test/link.zig

@@ -34,7 +34,7 @@ fn addWasmCases(cases: *tests.StandaloneContext) void {
     });
 
     cases.addBuildFile("test/link/wasm/bss/build.zig", .{
-        .build_modes = true,
+        .build_modes = false,
         .requires_stage2 = true,
     });
 
@@ -44,6 +44,11 @@ fn addWasmCases(cases: *tests.StandaloneContext) void {
         .use_emulation = true,
     });
 
+    cases.addBuildFile("test/link/wasm/producers/build.zig", .{
+        .build_modes = true,
+        .requires_stage2 = true,
+    });
+
     cases.addBuildFile("test/link/wasm/segments/build.zig", .{
         .build_modes = true,
         .requires_stage2 = true,

test/link/wasm/producers/build.zig

@@ -0,0 +1,36 @@
+const std = @import("std");
+const builtin = @import("builtin");
+const Builder = std.build.Builder;
+
+pub fn build(b: *Builder) void {
+    const mode = b.standardReleaseOptions();
+
+    const test_step = b.step("test", "Test");
+    test_step.dependOn(b.getInstallStep());
+
+    const lib = b.addSharedLibrary("lib", "lib.zig", .unversioned);
+    lib.setBuildMode(mode);
+    lib.setTarget(.{ .cpu_arch = .wasm32, .os_tag = .freestanding });
+    lib.use_llvm = false;
+    lib.use_stage1 = false;
+    lib.use_lld = false;
+    lib.install();
+
+    const zig_version = builtin.zig_version;
+    var version_buf: [100]u8 = undefined;
+    const version_fmt = std.fmt.bufPrint(&version_buf, "version {}", .{zig_version}) catch unreachable;
+
+    const check_lib = lib.checkObject(.wasm);
+    check_lib.checkStart("name producers");
+    check_lib.checkNext("fields 2");
+    check_lib.checkNext("field_name language");
+    check_lib.checkNext("values 1");
+    check_lib.checkNext("value_name Zig");
+    check_lib.checkNext(version_fmt);
+    check_lib.checkNext("field_name processed-by");
+    check_lib.checkNext("values 1");
+    check_lib.checkNext("value_name Zig");
+    check_lib.checkNext(version_fmt);
+
+    test_step.dependOn(&check_lib.step);
+}

test/link/wasm/producers/lib.zig

@@ -0,0 +1 @@
+export fn foo() void {}