OSX 10.10.5 - C++库，如何更改brew安装版本的链接或添加环境标志

Question

我遇到了一个链接库的问题。

我通过brew安装了它的一个版本，但后来我发现我需要在构建中添加环境标志：

CXXFLAGS="-stdlib=libstdc++ -mmacosx-version-min=10.6" \
            LDFLAGS="-stdlib=libstdc++ -mmacosx-version-min=10.6"

因此，我在opt/local/lib安装了另一个版本，它是使用这些标志构建的。我的问题是操作系统仍然在使用brew安装的版本。我已经搜索过了，但找不到如何让os链接到正确构建的库，或者如何使用标志构建brew版本。

我之所以相信这就是问题所在，是因为在为ruby构建quantlib-swig时，我得到了以下错误，一些论坛说这些错误与环境标志有关：

creating Makefile
compiling quantlib_wrap.cpp
In file included from quantlib_wrap.cpp:2647:
In file included from /usr/local/Cellar/quantlib/1.6.1/include/ql/quantlib.hpp:47:
In file included from /usr/local/Cellar/quantlib/1.6.1/include/ql/math/all.hpp:35:
In file included from /usr/local/Cellar/quantlib/1.6.1/include/ql/math/matrixutilities/all.hpp:4:
In file included from /usr/local/Cellar/quantlib/1.6.1/include/ql/math/matrixutilities/basisincompleteordered.hpp:25:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/valarray:4035:59: error: 
      'value_type' is a private member of
      'boost::iterators::detail::operator_brackets_proxy<QuantLib::step_iterator<double
      *> >'
    __val_expr<_BinaryOp<__bit_shift_left<typename _Expr::value_type>,
                                                          ^
quantlib_wrap.cpp:8228:23: note: while substituting deduced template arguments
      into function template 'operator<<' [with _Expr =
      boost::iterators::detail::operator_brackets_proxy<QuantLib::step_iterator<double
      *> >]
                    s << (*self)[i][j];
                      ^
In file included from quantlib_wrap.cpp:2647:
In file included from /usr/local/Cellar/quantlib/1.6.1/include/ql/quantlib.hpp:47:
In file included from /usr/local/Cellar/quantlib/1.6.1/include/ql/math/all.hpp:35:
In file included from /usr/local/Cellar/quantlib/1.6.1/include/ql/math/matrixutilities/all.hpp:4:
In file included from /usr/local/Cellar/quantlib/1.6.1/include/ql/math/matrixutilities/basisincompleteordered.hpp:25:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/valarray:4036:46: error: 
      'value_type' is a private member of
      'boost::iterators::detail::operator_brackets_proxy<QuantLib::step_iterator<double
      *> >'
               __scalar_expr<typename _Expr::value_type>, _Expr> >
                                             ^
2 errors generated.
make: *** [quantlib_wrap.o] Error 1

Answer 1

关于问题的后半部分，如何使用标志构建brew版本，您可以在安装函数中使用ENV.append在OSX上构建quantlib homebrew配方：

def install
  ...
  if MacOS.version >= :mavericks && ENV.compiler == :clang
    ENV.append "CXXFLAGS", "-stdlib=libstdc++ -mmacosx-version-min=10.6"
    ENV.append "LDFLAGS", "-stdlib=libstdc++ -mmacosx-version-min=10.6"
  end
  ...
  system "make", "install"
end