[build] Only cache raygui impl (#170)

Author: Not-Nik

build.zig

@@ -97,52 +97,55 @@ fn link(
     exe.linkLibrary(lib);
 }
 
-var _raylib_lib_cache: ?*std.Build.Step.Compile = null;
+var _raygui_impl_cache: ?*std.Build.Step.WriteFile = null;
+var _raygui_impl_path_cache: ?std.Build.LazyPath = null;
 fn getRaylib(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.builtin.OptimizeMode, options: Options) *std.Build.Step.Compile {
-    if (_raylib_lib_cache) |lib| return lib else {
-        const raylib = b.dependency("raylib", .{
-            .target = target,
-            .optimize = optimize,
-            .raudio = options.raudio,
-            .rmodels = options.rmodels,
-            .rshapes = options.rshapes,
-            .rtext = options.rtext,
-            .rtextures = options.rtextures,
-            .platform = options.platform,
-            .shared = options.shared,
-            .linux_display_backend = options.linux_display_backend,
-            .opengl_version = options.opengl_version,
-        });
+    if (_raygui_impl_cache == null) {
+        var gen_step = b.addWriteFiles();
 
-        const lib = raylib.artifact("raylib");
+        _raygui_impl_cache = gen_step;
+        _raygui_impl_path_cache = gen_step.add("raygui.c", "#define RAYGUI_IMPLEMENTATION\n#include \"raygui.h\"\n");
+    }
 
-        const raygui_dep = b.dependency("raygui", .{
-            .target = target,
-            .optimize = optimize,
-        });
+    const raylib = b.dependency("raylib", .{
+        .target = target,
+        .optimize = optimize,
+        .raudio = options.raudio,
+        .rmodels = options.rmodels,
+        .rshapes = options.rshapes,
+        .rtext = options.rtext,
+        .rtextures = options.rtextures,
+        .platform = options.platform,
+        .shared = options.shared,
+        .linux_display_backend = options.linux_display_backend,
+        .opengl_version = options.opengl_version,
+    });
 
-        var gen_step = b.addWriteFiles();
-        lib.step.dependOn(&gen_step.step);
-
-        const raygui_c_path = gen_step.add("raygui.c", "#define RAYGUI_IMPLEMENTATION\n#include \"raygui.h\"\n");
-        lib.addCSourceFile(.{
-            .file = raygui_c_path,
-            .flags = &[_][]const u8{
-                "-std=gnu99",
-                "-D_GNU_SOURCE",
-                "-DGL_SILENCE_DEPRECATION=199309L",
-                "-fno-sanitize=undefined", // https://github.com/raysan5/raylib/issues/3674
-            },
-        });
-        lib.addIncludePath(raylib.path("src"));
-        lib.addIncludePath(raygui_dep.path("src"));
+    const lib = raylib.artifact("raylib");
 
-        lib.installHeader(raygui_dep.path("src/raygui.h"), "raygui.h");
+    const raygui_dep = b.dependency("raygui", .{
+        .target = target,
+        .optimize = optimize,
+    });
 
-        b.installArtifact(lib);
-        _raylib_lib_cache = lib;
-        return lib;
-    }
+    lib.step.dependOn(&(_raygui_impl_cache orelse unreachable).step);
+
+    lib.addCSourceFile(.{
+        .file = (_raygui_impl_path_cache orelse unreachable),
+        .flags = &[_][]const u8{
+            "-std=gnu99",
+            "-D_GNU_SOURCE",
+            "-DGL_SILENCE_DEPRECATION=199309L",
+            "-fno-sanitize=undefined", // https://github.com/raysan5/raylib/issues/3674
+        },
+    });
+    lib.addIncludePath(raylib.path("src"));
+    lib.addIncludePath(raygui_dep.path("src"));
+
+    lib.installHeader(raygui_dep.path("src/raygui.h"), "raygui.h");
+
+    b.installArtifact(lib);
+    return lib;
 }
 
 fn getModule(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.builtin.OptimizeMode) *std.Build.Module {