stage1 解决重构哈希 nob优化支持头文件缓存以及win下exe缓存

nob.c

@@ -30,6 +30,7 @@ static const char *splc0_srcs[] = {
     "stage1/spl_parser.c",
     "stage1/spl_dumptree.c",
     "stage1/spl_type.c",
+    "stage1/spl_fold.c",
     "stage1/spl_lang_type.c",
     "stage1/spl_attr.c",
     "stage1/spl_scope.c",
@@ -78,6 +79,16 @@ static const char *obj_path(const char *src) {
     return out;
 }
 
+// Windows 上 clang/gcc 会输出 build/foo.exe；这里统一带上后缀，
+// 否则 nob_needs_rebuild 找不到输出会每次重新链接。
+static const char *exe_path(const char *name) {
+#ifdef _WIN32
+    return nob_temp_sprintf(BUILD_FOLDER "%s.exe", name);
+#else
+    return nob_temp_sprintf(BUILD_FOLDER "%s", name);
+#endif
+}
+
 static bool sync_cflags_stamp(void) {
     Nob_String_View cflags = nob_sv_from_cstr(CFLAGS_STR);
     Nob_String_Builder old = {0};
@@ -95,10 +106,39 @@ static bool sync_cflags_stamp(void) {
     return true;
 }
 
+// 头文件依赖：收集 stage0/stage1 下的所有 .h，作为每个 object 的输入。
+// nob 不解析 #include，这里用“任一头文件变化则重建全部 object”的保守策略，
+// 避免头文件改动后各 .o 结构体布局/常量不一致导致的隐蔽错误。
+static Nob_Files g_headers = {0};
+
+static bool collect_header_entry(Nob_Walk_Entry entry) {
+    if (entry.type != NOB_FILE_REGULAR)
+        return true;
+    const char *dot = strrchr(entry.path, '.');
+    if (!dot || strcmp(dot, ".h") != 0)
+        return true;
+    if (strstr(entry.path, ".old") != NULL)
+        return true;
+    da_append(&g_headers, nob_temp_strdup(entry.path));
+    return true;
+}
+
+static bool collect_headers(void) {
+    if (g_headers.count > 0)
+        return true;
+    if (!nob_walk_dir("stage0", collect_header_entry))
+        return false;
+    if (!nob_walk_dir("stage1", collect_header_entry))
+        return false;
+    return true;
+}
+
 static bool prepare_build(void) {
     if (!nob_mkdir_if_not_exists(BUILD_FOLDER))
         return false;
-    return sync_cflags_stamp();
+    if (!sync_cflags_stamp())
+        return false;
+    return collect_headers();
 }
 
 static bool build_object(const char *src) {
@@ -108,8 +148,16 @@ static bool build_object(const char *src) {
         return false;
     }
 
-    const char *inputs[] = {src, CFLAGS_STAMP};
-    int needs = nob_needs_rebuild(obj, inputs, NOB_ARRAY_LEN(inputs));
+    // 依赖：源文件 + 所有头文件 + cflags 戳。
+    size_t ninputs = g_headers.count + 2;
+    const char **inputs = (const char **)nob_temp_alloc(sizeof(const char *) * ninputs);
+    inputs[0] = src;
+    for (size_t i = 0; i < g_headers.count; ++i) {
+        inputs[i + 1] = g_headers.items[i];
+    }
+    inputs[ninputs - 1] = CFLAGS_STAMP;
+
+    int needs = nob_needs_rebuild(obj, inputs, ninputs);
     if (needs < 0)
         return false;
     if (needs == 0)
@@ -125,7 +173,7 @@ static bool build_object(const char *src) {
 }
 
 static bool link_exe(const target_t *target) {
-    const char *exe = nob_temp_sprintf(BUILD_FOLDER "%s", target->name);
+    const char *exe = exe_path(target->name);
     const char **objs = (const char **)nob_temp_alloc(sizeof(const char *) * target->srcs_count);
     for (size_t i = 0; i < target->srcs_count; ++i) {
         objs[i] = obj_path(target->srcs[i]);
@@ -225,7 +273,7 @@ static bool test_once(const char *fname, void *user_data) {
     }
     cmd.count = 0;
 
-    nob_cmd_append(&cmd, nob_temp_sprintf(BUILD_FOLDER "%s", compiler_path));
+    nob_cmd_append(&cmd, exe_path(compiler_path));
     nob_cmd_append(&cmd, fname, target_sir);
     if (!nob_cmd_run(&cmd)) {
         return false;
@@ -235,7 +283,7 @@ static bool test_once(const char *fname, void *user_data) {
         return 1;
     }
     cmd.count = 0;
-    nob_cmd_append(&cmd, nob_temp_sprintf(BUILD_FOLDER "%s", cli_path));
+    nob_cmd_append(&cmd, exe_path(cli_path));
     nob_cmd_append(&cmd, target_sir);
     // nob_cmd_run(&cmd);
 
@@ -267,7 +315,7 @@ static bool test_once_with_dump(const char *fname, void *user_data) {
     if (!build_target(target_name))
         return 1;
     Nob_Cmd cmd = {0};
-    nob_cmd_append(&cmd, nob_temp_sprintf(BUILD_FOLDER "%s", target_name));
+    nob_cmd_append(&cmd, exe_path(target_name));
     nob_cmd_append(&cmd, "--dump", (char *)user_data, fname, BUILD_FOLDER "t.sir");
     return nob_cmd_run(&cmd);
 }
@@ -402,7 +450,7 @@ int main(int argc, char **argv) {
         if (!build_target(target_name))
             return 1;
         Nob_Cmd cmd = {0};
-        nob_cmd_append(&cmd, nob_temp_sprintf(BUILD_FOLDER "%s", target_name));
+        nob_cmd_append(&cmd, exe_path(target_name));
         while (argc > 0) {
             nob_cmd_append(&cmd, nob_shift(argv, argc));
         }