GCC -O2与无原因的错误 [英] gcc -O2 vs. without causes error

问题描述

在编译包含打开（文件名，O_RDONLY）文件; 没有 -O2 标记一切都很好。但是，当 -O2 打开时，我得到：

  /usr/include/x86_64-linux-gnu/bits/fcntl2.h：在功能上开放：
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:44:7：错误：无效使用'__builtin_va_arg_pack_len（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:45:26：错误：调用与属性错误声明__open_too_many_args：打开可称为无论是与2个或3个参数，而不是更多
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:42:1：错误：无效使用'__builtin_va_arg_pack_len（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:60:3：错误：无效使用'__builtin_va_arg_pack（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h：在功能open64：
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:76:7：错误：无效使用'__builtin_va_arg_pack_len（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:77:28：错误：调用与属性错误声明__open64_too_many_args'：open64可以被称为无论是与2个或3个参数，而不是更多
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:74:1：错误：无效使用'__builtin_va_arg_pack_len（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:92:3：错误：无效使用'__builtin_va_arg_pack（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h：在函数'openat'：
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:120:7：错误：无效使用'__builtin_va_arg_pack_len（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:121:28：错误：调用与属性错误声明__openat_too_many_args'：openat可以被称为无论是与3个或4个参数，而不是更多
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:118:1：错误：无效使用'__builtin_va_arg_pack_len（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:136:3：错误：无效使用'__builtin_va_arg_pack（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h：在函数'openat64：
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:154:7：错误：无效使用'__builtin_va_arg_pack_len（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:155:30：错误：调用与属性错误声明__openat64_too_many_args'：openat64可以被称为无论是与3个或4个参数，而不是更多
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:152:1：错误：无效使用'__builtin_va_arg_pack_len（）
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:170:3：错误：无效使用'__builtin_va_arg_pack（）
 

在哪里是什么问题？它的混合 C / C ++ 项目，但是这是在 C 部分。 GCC 4.6.1，内核3.0.0

编辑：原来，commeting掉那些行给出了另一个像错误的类型：

  /usr/include/x86_64-linux-gnu/bits/stdio2.h：在功能的sprintf：
/usr/include/x86_64-linux-gnu/bits/stdio2.h:34:3：错误：无效使用'__builtin_va_arg_pack（）
 

解决方案

试着用 -fno-内建编译。如果修复它，然后你显然某种问题，但它可能不是你的源。

When compiling file containing open("FILENAME", O_RDONLY); without -O2 flag everything is fine. But when -O2 is turned on I get:

/usr/include/x86_64-linux-gnu/bits/fcntl2.h: In function ‘open’:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:44:7: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:45:26: error: call to ‘__open_too_many_args’ declared with attribute error: open can be called either with 2 or 3 arguments, not more
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:42:1: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:60:3: error: invalid use of ‘__builtin_va_arg_pack ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h: In function ‘open64’:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:76:7: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:77:28: error: call to ‘__open64_too_many_args’ declared with attribute error: open64 can be called either with 2 or 3 arguments, not more
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:74:1: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:92:3: error: invalid use of ‘__builtin_va_arg_pack ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h: In function ‘openat’:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:120:7: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:121:28: error: call to ‘__openat_too_many_args’ declared with attribute error: openat can be called either with 3 or 4 arguments, not more
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:118:1: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:136:3: error: invalid use of ‘__builtin_va_arg_pack ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h: In function ‘openat64’:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:154:7: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:155:30: error: call to ‘__openat64_too_many_args’ declared with attribute error: openat64 can be called either with 3 or 4 arguments, not more
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:152:1: error: invalid use of ‘__builtin_va_arg_pack_len ()’
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:170:3: error: invalid use of ‘__builtin_va_arg_pack ()’

Where can be the problem? It's mixed C/C++ project but this is in the C part. gcc 4.6.1, kernel 3.0.0

Edit: It turns out that commeting out those line gives another "type" of errors like:

/usr/include/x86_64-linux-gnu/bits/stdio2.h: In function ‘sprintf’:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:34:3: error: invalid use of ‘__builtin_va_arg_pack ()’

解决方案

Try compiling with -fno-builtins. If that fixes it then you've obviously got some sort of problem, but it's probably not in your source.

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