c - dbus-1 gcc错误: expected ';' , ','或 ')'在 'struct'之前

Question

我尝试在项目中使用 mingw32-gcc 编译 dbus-1，但出现编译器错误

 error: expected ';', ',' or ')' before 'struct'.

据我所知，有问题的行是一个函数调用。这是 makefile 日志的摘录:

` c:/MinGW/include/dbus-1.0/dbus/dbus-message.h:73:95: error: expected ';', ',' or ')' before 'struct'
 DBusMessage* dbus_message_new_method_call(const char *bus_name, const char    *path, const char *interface ,const char *method);`  

以下是 dbus-message.h 头文件的摘录:

#if !defined (DBUS_INSIDE_DBUS_H) && !defined (DBUS_COMPILATION)
#error "Only <dbus/dbus.h> can be included directly, this file may disappear     or change contents."
#endif

#ifndef DBUS_MESSAGE_H
#define DBUS_MESSAGE_H

#include <dbus/dbus-macros.h>
#include <dbus/dbus-types.h>
#include <dbus/dbus-arch-deps.h>
#include <dbus/dbus-memory.h>
#include <dbus/dbus-errors.h>
#include <stdarg.h>

DBUS_BEGIN_DECLS

/**
 * @addtogroup DBusMessage
 * @{
 */

 typedef struct DBusMessage DBusMessage;
/** Opaque type representing a message iterator. Can be copied by value, and   contains no allocated memory so never needs to be freed and can be allocated on the stack. */
 typedef struct DBusMessageIter DBusMessageIter;

 /**
  * DBusMessageIter struct; contains no public fields. 
  */
  struct DBusMessageIter
 { 
   void *dummy1;         /**< Don't use this */
   void *dummy2;         /**< Don't use this */
   dbus_uint32_t dummy3; /**< Don't use this */
   int dummy4;           /**< Don't use this */
   int dummy5;           /**< Don't use this */
   int dummy6;           /**< Don't use this */
   int dummy7;           /**< Don't use this */
   int dummy8;           /**< Don't use this */
   int dummy9;           /**< Don't use this */
   int dummy10;          /**< Don't use this */
   int dummy11;          /**< Don't use this */
   int pad1;             /**< Don't use this */
   int pad2;             /**< Don't use this */
   void *pad3;           /**< Don't use this */
  };

 DBUS_EXPORT
 DBusMessage* dbus_message_new               (int          message_type);
 DBUS_EXPORT

 DBusMessage* dbus_message_new_method_call(const char *bus_name, const char *path, const char *interface ,const char *method);

我无法弄清楚为什么编译器认为接口(interface)是一个结构。从 c 源代码和其他 header 来看，它似乎是一个字符字符串指针。

非常感谢任何建议。

Answer 1

我不确定您提供的代码是否是整个头文件。但是，如果是这样，看起来您缺少 #ifndef DBUS_MESSAGE_H header 保护的 #endif。尝试将 #endif 放在文件末尾。