错误的建筑升压1.49.0与海湾合作委员会4.7.0 [英] Error building Boost 1.49.0 with GCC 4.7.0

问题描述

我试图建立使用GCC 4.7.0（MinGW的）升压1.49.0。我不断收到以下错误消息数十倍：

I'm trying to build Boost 1.49.0 using GCC 4.7.0 (MinGW). I keep getting the following error message several dozen times:

C：\\工具\\ MinGW的\\ BIN ../ lib中/ GCC / i686的-PC-的mingw32 / 4.7.0 /../../../../包括/ C ++ / 4.7.0 / CMATH： 1096：11：错误：':: hypot尚未声明

c:\tools\mingw\bin../lib/gcc/i686-pc-mingw32/4.7.0/../../../../include/c++/4.7.0/cmath:1096:11: error: '::hypot' has not been declared

1096行 CMATH 包含

using ::hypot;

CMATH 包括文件math.h 该声明 hypot 功能

extern double __cdecl hypot (double, double); /* in libmoldname.a */

在这两个文件，​​一对夫妇上面引述的那些后线，都为 hypotl 功能相同的语句（除了类型长双而不是双击）和一个似乎高兴。

In both files, a couple of lines after the ones quoted above, are identical statements for the hypotl function (except the type is long double instead of double) and that one seems happy.

任何想法，为什么我收到此错误？

Any ideas why I am getting this error?

推荐答案

发现在<一个答案href=\"http://boost.2283326.n4.nabble.com/Boost-Python-Compile-Error-s-GCC-via-MinGW-w64-tp3165793p3166757.html\">this论坛帖子。看来的 pyconfig.h 的有下面几行：

Found the answer in this forum post. It seems that pyconfig.h has the following lines:

#if defined(__GNUC__) && defined(_WIN32)
// ...
#define hypot _hypot
// ...
#endif /* GNUC */

不过的 CMATH 的包含MinGW的希望被命名的函数 hypot ，而不是 _hypot ，这会导致编译错误。

but cmath included with MinGW expects the function to be named hypot and not _hypot, which causes the compilation errors.

此修复程序是包括以下我的bjam命令行的 CXXFLAGS 的选项

The fix was to include the following to my bjam command line's cxxflags option

bjam ... cxxflags="-include cmath "

这表明G ++应包括的 CMATH 的每个源文件的开头报头

This indicates that g++ should include the cmath header at the beginning of every source file.

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