build: don't define FUNC_ATTR_* as empty in headers (#26317)

FUNC_ATTR_* should only be used in .c files with generated headers.
Defining FUNC_ATTR_* as empty in headers causes misuses of them to be
silently ignored. Instead don't define them by default, and only define
them as empty after a .c file has included its generated header.

src/nvim/api/autocmd.c

@@ -17,7 +17,6 @@
 #include "nvim/buffer.h"
 #include "nvim/eval/typval.h"
 #include "nvim/ex_cmds_defs.h"
-#include "nvim/func_attr.h"
 #include "nvim/globals.h"
 #include "nvim/lua/executor.h"
 #include "nvim/memory.h"

src/nvim/api/buffer.c

@@ -24,7 +24,6 @@
 #include "nvim/drawscreen.h"
 #include "nvim/ex_cmds.h"
 #include "nvim/extmark.h"
-#include "nvim/func_attr.h"
 #include "nvim/globals.h"
 #include "nvim/lua/executor.h"
 #include "nvim/mapping.h"

src/nvim/api/command.c

@@ -18,7 +18,6 @@
 #include "nvim/ex_cmds.h"
 #include "nvim/ex_docmd.h"
 #include "nvim/ex_eval.h"
-#include "nvim/func_attr.h"
 #include "nvim/garray.h"
 #include "nvim/globals.h"
 #include "nvim/lua/executor.h"

src/nvim/api/deprecated.c

@@ -14,7 +14,6 @@
 #include "nvim/buffer_defs.h"
 #include "nvim/decoration.h"
 #include "nvim/extmark.h"
-#include "nvim/func_attr.h"
 #include "nvim/globals.h"
 #include "nvim/highlight.h"
 #include "nvim/highlight_group.h"

src/nvim/api/extmark.c

@@ -17,7 +17,6 @@
 #include "nvim/decoration_provider.h"
 #include "nvim/drawscreen.h"
 #include "nvim/extmark.h"
-#include "nvim/func_attr.h"
 #include "nvim/grid.h"
 #include "nvim/highlight_group.h"
 #include "nvim/marktree.h"

src/nvim/api/options.c

@@ -11,7 +11,6 @@
 #include "nvim/autocmd.h"
 #include "nvim/buffer.h"
 #include "nvim/eval/window.h"
-#include "nvim/func_attr.h"
 #include "nvim/globals.h"
 #include "nvim/macros_defs.h"
 #include "nvim/memory.h"

src/nvim/api/private/converter.c

@@ -11,7 +11,6 @@
 #include "nvim/eval/typval.h"
 #include "nvim/eval/typval_defs.h"
 #include "nvim/eval/userfunc.h"
-#include "nvim/func_attr.h"
 #include "nvim/lua/executor.h"
 #include "nvim/memory.h"
 #include "nvim/types_defs.h"

src/nvim/api/private/helpers.c

@@ -20,7 +20,6 @@
 #include "nvim/eval/typval_defs.h"
 #include "nvim/eval/vars.h"
 #include "nvim/ex_eval.h"
-#include "nvim/func_attr.h"
 #include "nvim/garray.h"
 #include "nvim/globals.h"
 #include "nvim/highlight_group.h"

src/nvim/api/tabpage.c

@@ -6,11 +6,14 @@
 #include "nvim/api/tabpage.h"
 #include "nvim/api/vim.h"
 #include "nvim/buffer_defs.h"
-#include "nvim/func_attr.h"
 #include "nvim/globals.h"
 #include "nvim/memory.h"
 #include "nvim/window.h"
 
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "api/tabpage.c.generated.h"
+#endif
+
 /// Gets the windows in a tabpage
 ///
 /// @param tabpage  Tabpage handle, or 0 for current tabpage

src/nvim/api/ui.c

@@ -17,7 +17,6 @@
 #include "nvim/eval.h"
 #include "nvim/event/loop.h"
 #include "nvim/event/wstream.h"
-#include "nvim/func_attr.h"
 #include "nvim/globals.h"
 #include "nvim/grid.h"
 #include "nvim/highlight.h"

src/nvim/api/vim.c

@@ -31,7 +31,6 @@
 #include "nvim/ex_docmd.h"
 #include "nvim/ex_eval.h"
 #include "nvim/fold.h"
-#include "nvim/func_attr.h"
 #include "nvim/getchar.h"
 #include "nvim/globals.h"
 #include "nvim/grid.h"

src/nvim/api/vimscript.c

@@ -15,7 +15,6 @@
 #include "nvim/eval/typval.h"
 #include "nvim/eval/userfunc.h"
 #include "nvim/ex_docmd.h"
-#include "nvim/func_attr.h"
 #include "nvim/garray.h"
 #include "nvim/globals.h"
 #include "nvim/memory.h"

src/nvim/api/win_config.c

@@ -13,7 +13,6 @@
 #include "nvim/buffer_defs.h"
 #include "nvim/decoration.h"
 #include "nvim/drawscreen.h"
-#include "nvim/func_attr.h"
 #include "nvim/globals.h"
 #include "nvim/grid.h"
 #include "nvim/highlight_group.h"

src/nvim/api/window.c

@@ -15,7 +15,6 @@
 #include "nvim/drawscreen.h"
 #include "nvim/eval/window.h"
 #include "nvim/ex_docmd.h"
-#include "nvim/func_attr.h"
 #include "nvim/gettext.h"
 #include "nvim/globals.h"
 #include "nvim/lua/executor.h"
@@ -27,6 +26,10 @@
 #include "nvim/types_defs.h"
 #include "nvim/window.h"
 
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "api/window.c.generated.h"
+#endif
+
 /// Gets the current buffer in a window
 ///
 /// @param window   Window handle, or 0 for current window