libpam:shadow.h:error: expected declaration specifiers before '__THROW'

最新推荐文章于 2022-09-30 16:53:41 发布

iteye_18365

最新推荐文章于 2022-09-30 16:53:41 发布

阅读量330

点赞数

文章标签： c/c++ 移动开发操作系统

本文详细介绍了在使用Android gcc编译时遇到的cdefs.h版本问题，导致__THROW未定义错误的解决方法。通过从GNU gcc cdefs.h复制相关定义，成功解决了该问题。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

When I'm makeing libpam, it claims that there's no shadow.h. Then I found a shadow.h.

But another issue shows up: error: expected declaration specifiers before '__THROW'.

This is because Android gcc is using cdefs.h of the following version:

/*$NetBSD: cdefs.h,v 1.58 2004/12/11 05:59:00 christos Exp $*/

And there's no '__THROW' definition in it.

So I copy '__THROW' definition from the GNU gcc cdefs.h .

Here's the definition :

#ifdef __GNUC__

/* GCC can always grok prototypes. For C++ programs we add throw()
to help it optimize the function calls. But this works only with
gcc 2.8.x and egcs. For gcc 3.2 and up we even mark C functions
as non-throwing using a function attribute since programs can use
the -fexceptions options for C code as well. */
# if !defined __cplusplus && __GNUC_PREREQ__ (3, 3)
# define __THROW__attribute__ ((__nothrow__))
# define __NTH(fct)__attribute__ ((__nothrow__)) fct
# else
# if defined __cplusplus && __GNUC_PREREQ__ (2,8)
# define __THROWthrow ()
# define __NTH(fct)fct throw ()
# else
# define __THROW
# define __NTH(fct)fct
# endif
# endif

#else/* Not GCC. */

# define __inline/* No inline functions. */

# define __THROW
# define __NTH(fct)fct

# define __constconst
# define __signedsigned
# define __volatilevolatile

#endif/* GCC. */

it seems to be fine now.