move wasm target struct around to avoid analyzing wasm file on non-wasm

src/font/main.zig

@@ -56,8 +56,8 @@ pub const Backend = enum {
     /// Returns the default backend for a build environment. This is
     /// meant to be called at comptime.
     pub fn default() Backend {
-        const wasm = @import("../os/wasm.zig");
+        const wasm_target = @import("../os/wasm/target.zig");
-        if (wasm.target) |target| return switch (target) {
+        if (wasm_target.target) |target| return switch (target) {
             .browser => .web_canvas,
         };
 

src/os/wasm.zig

@@ -14,16 +14,6 @@ comptime {
 /// in JS will be backed by a SharedArrayBuffer and some behaviors change.
 pub const shared_mem = options.wasm_shared;
 
-/// Our specific target platform.
-pub const target: ?Target = if (!builtin.target.isWasm()) null else target: {
-    const result = @intToEnum(Target, @enumToInt(options.wasm_target));
-    // This maybe isn't necessary but I don't know if enums without a specific
-    // tag type and value are guaranteed to be the same between build.zig
-    // compilation and our own source compilation so I have this just in case.
-    std.debug.assert(std.mem.eql(u8, @tagName(result), @tagName(options.wasm_target)));
-    break :target result;
-};
-
 /// The allocator to use in wasm environments.
 ///
 /// The return values of this should NOT be sent to the host environment

src/os/wasm/log.zig

@@ -1,9 +1,10 @@
 const std = @import("std");
 const builtin = @import("builtin");
 const wasm = @import("../wasm.zig");
+const wasm_target = @import("target.zig");
 
 // Use the correct implementation
-pub usingnamespace if (wasm.target) |target| switch (target) {
+pub usingnamespace if (wasm_target.target) |target| switch (target) {
     .browser => Browser,
 } else struct {};
 

src/os/wasm/target.zig

@@ -1,6 +1,20 @@
+const std = @import("std");
+const builtin = @import("builtin");
+const options = @import("build_options");
+
 /// The wasm target platform. This is used to toggle certain features
 /// on and off since the standard triple target is often not specific
 /// enough (i.e. we can't tell wasm32-freestanding is for browser or not).
 pub const Target = enum {
     browser,
 };
+
+/// Our specific target platform.
+pub const target: ?Target = if (!builtin.target.isWasm()) null else target: {
+    const result = @intToEnum(Target, @enumToInt(options.wasm_target));
+    // This maybe isn't necessary but I don't know if enums without a specific
+    // tag type and value are guaranteed to be the same between build.zig
+    // compilation and our own source compilation so I have this just in case.
+    std.debug.assert(std.mem.eql(u8, @tagName(result), @tagName(options.wasm_target)));
+    break :target result;
+};

src/renderer.zig

@@ -21,8 +21,8 @@ pub const State = @import("renderer/State.zig");
 
 /// The implementation to use for the renderer. This is comptime chosen
 /// so that every build has exactly one renderer implementation.
-const wasm = @import("os/wasm.zig");
+const wasm_target = @import("os/wasm/target.zig");
-pub const Renderer = if (wasm.target) |target| switch (target) {
+pub const Renderer = if (wasm_target.target) |target| switch (target) {
     .browser => WebGL,
 } else switch (builtin.os.tag) {
     .macos => Metal,