Cedet/Semantic未考虑C预处理器定义

Question

我正在尝试在我的Linux内核开发项目中使用Emacs作为IDE。因此，我已经顺利安装了CEDET和GNU Global (gtags)。

当我打开属于Linux内核源文件夹的C源代码时，Linux项目会被自动检测到。函数、变量、头文件和其他关键字都能正确地高亮显示。

通过~/.emacs文件，我配置了semantic的代码完成和智能感知。因此，当我按下C-时，代码完成菜单就会出现，我可以选择所需的内容。

问题在于，当我使用预处理器定义时，智能感知系统会在当前位置显示菜单，但在调用（C-）时无法正确识别。即使我关闭并重新启动Emacs，也会重现相同的行为。

测试代码如下：

typedef struct
{
     int p1;

        #ifdef __KERNEL__

            int p2;

        #endif

        #ifdef USE1

             char p3;

          #endif

#ifdef __LINUX_ARM_ARCH__

   int p4;

#endif

}OBJ;

OBJ g_obj;

//----------------------------------------------------------------------------------------

KERNEL，USE1和LINUX_ARM_ARCH已经定义如下：

__KERNEL__ : (add-to-list 'semantic-lex-c-preprocessor-symbol-map '("__KERNEL__" . "")) in .emacs
USE1 : defined in a header file included by the current C source file.
__LINUX_ARM_ARCH__ : (add-to-list 'semantic-lex-c-preprocessor-symbol-file "/home/abdellatif/kernel/include/generated/autoconf.h") in .emacs

在 .emacs 文件中，我还添加了所有由 GCC 交叉编译器（ARM 的 GCC）所需的包含和定义，以构建内核项目。

我还尝试强制 semantic 使用 GCC 交叉编译器命令行来正确预处理，但还没找到如何做到这一点。

“M-x semantic-c-describe-environment” 命令显示正确的包含路径和定义（在 .emacs 中设置）。但系统 GCC 定义也被列出。

下面显示了 .emacs 文件和软件版本。

欢迎任何帮助或提示 :) 最好的问候

############# Software versions #############

- Emacs (23.2.1)
- Ubuntu machine (natty, 11.04)
- Cedet 1.0 (from http://cedet.sourceforge.net/)

############# .emacs #############

;load CEDET

(load-file "~/Documents/my_emacs/cedet-1.0/common/cedet.el")

(require 'ede)

(global-ede-mode t)
; turn on which-func support (plus all other code helpers)
(semantic-load-enable-gaudy-code-helpers)
(semantic-load-enable-excessive-code-helpers)

; turn on all "useful" features
(setq semantic-load-turn-useful-things-on t)

(setq-mode-local c-mode
         semanticdb-find-default-throttle
         '(project unloaded system recursive))

;init names completion, and displaying of information for tags & classes
(require 'semantic-ia)

;preprocessing of source code

(require 'semantic-c)

(semantic-reset-system-include 'c-mode)
(semantic-reset-system-include 'c++-mode)
(semantic-add-system-include "/home/abdellatif/toolchain/arm-eabi-4.4.3/lib/gcc/arm-eabi/4.4.3/include" 'c-mode)
(semantic-add-system-include "/home/abdellatif/kernel/arch/arm/include" 'c-mode)
(semantic-add-system-include "/home/abdellatif/kernel/include" 'c-mode)
(semantic-add-system-include "/home/abdellatif/kernel/arch/arm/mach-omap2/include" 'c-mode)
(semantic-add-system-include "/home/abdellatif/kernel/arch/arm/plat-omap/include" 'c-mode)
(add-to-list 'semantic-lex-c-preprocessor-symbol-file "/home/abdellatif/kernel/include/generated/autoconf.h")
(add-to-list 'semantic-lex-c-preprocessor-symbol-map '("__KERNEL__" . ""))
(add-to-list 'semantic-lex-c-preprocessor-symbol-map '("__LINUX_ARM_ARCH__" . "7"))
(add-to-list 'semantic-lex-c-preprocessor-symbol-map '("KBUILD_STR(s)" . "#s"))
(add-to-list 'semantic-lex-c-preprocessor-symbol-map '("KBUILD_BASENAME" . "KBUILD_STR(main)"))
(add-to-list 'semantic-lex-c-preprocessor-symbol-map '("KBUILD_MODNAME" . "KBUILD_STR(main)"))

;semantic integration with imenu (display of a menu with a list of functions, variables, and other tags)
(defun my-semantic-hook ()
  (imenu-add-to-menubar "TAGS"))
(add-hook 'semantic-init-hooks 'my-semantic-hook)

;names completion (semantic commands)
(defun my-cedet-hook ()
 (local-set-key [(control return)] 'semantic-ia-complete-symbol)
  (local-set-key "\C-x " 'semantic-ia-complete-symbol-menu)
   (local-set-key "\C-x\r" 'gtags-find-tag-from-here))
(add-hook 'c-mode-common-hook 'my-cedet-hook)

;navigating in source code
(semantic-mru-bookmark-mode 1)

;tell semantic to store its tags database between sessions here
(require 'semanticdb)
(setq-default semanticdb-default-save-directory "~/.semantic.cache")
(setq-default semanticdb-default-system-save-directory "~/.semantic.cache")

;allow Semanticdb use databases generated by global(gtags)
(require 'semanticdb-global)
(semanticdb-enable-gnu-global-databases 'c-mode)

- Abdellatif El Khlifi

Answer 1

1. 你应该从主线获取cedet：
   bzr://cedet.bzr.sourceforge.net/bzrroot/cedet/code/trunk/
   最近有几个关于预处理器处理的修复。

2. 在更改semantic-lex-c-preprocessor-symbol-file和类似的东西的列表后，您应该删除语义缓存并允许它从头开始重新创建。

- fghj