在Mac OSX 10.8上使用clang和libC++连接GraphicsMagick

Question

在过去的几天里，我一直试图将GraphicsMagick加入到我的项目中，但没有运气，希望这里有人能够帮助我（最后参见TL/DR如果这太长）。

，因为我需要JPEG，PNG和lcms支持，我以前下载并使用配置建站，使工具：

./configure CC=clang 
make 
sudo make install 

这一切似乎在下载GraphicsMagick工具后工作正常，所以，我跑配置再次：

CC=clang CXX="clang++ -stdlib=libc++" CXXFLAGS="-stdlib=libc++" LDFLAGS="-stdlib=libc++" ./configure --enable-shared --disable-static --disable-openmp --without-xml --without-zlib --without-bzlib

然后make创建我的动态库：libGraphicsMagick.3.dylib和libGraphicsMagick++.3.dylib。当我检查libGraphicsMagick ++与MacDependency或otool，我看到它是连接对/usr/lib/libc++.1.dylib（而不是的libstdC++）

现在，如果我创建使用GraphicsMagick工具一个新的项目，添加#include <Magick++.h>（安装在上一步骤中的/ usr /本地/包括/ GraphicsMagick工具），这一点，实际上并没有使用任何功能，我得到一个链接错误：

clang++ -headerpad_max_install_names -stdlib=libc++ -arch x86_64 -o TestMagickApp.app/Contents/MacOS/TestMagickApp main.o widget.o moc_widget.o -F/Library/Frameworks -L/Library/Frameworks -framework QtGui -framework QtCore 
Undefined symbols for architecture x86_64: 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::gptr() const", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::seekoff(long long, std::__1::ios_base::seekdir, unsigned int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::underflow() in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::pbackfail(int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::pptr() const", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::seekoff(long long, std::__1::ios_base::seekdir, unsigned int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::underflow() in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::pbackfail(int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::eback() const", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::seekoff(long long, std::__1::ios_base::seekdir, unsigned int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::underflow() in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::pbackfail(int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::egptr() const", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::underflow() in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::epptr() const", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::seekoff(long long, std::__1::ios_base::seekdir, unsigned int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::pbase() const", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::seekoff(long long, std::__1::ios_base::seekdir, unsigned int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
    "std::__1::basic_iostream<char, std::__1::char_traits<char> >::basic_iostream(std::__1::basic_streambuf<char, std::__1::char_traits<char> >*)", referenced from: 
     std::__1::basic_stringstream<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_stringstream(unsigned int) in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::setg(char*, char*, char*)", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::seekoff(long long, std::__1::ios_base::seekdir, unsigned int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::underflow() in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::pbackfail(int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::str(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::setp(char*, char*)", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::seekoff(long long, std::__1::ios_base::seekdir, unsigned int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::str(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::pbump(int)", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::seekoff(long long, std::__1::ios_base::seekdir, unsigned int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::str(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in widget.o 
    "std::__1::basic_streambuf<char, std::__1::char_traits<char> >::sputc(char)", referenced from: 
     std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char> >::overflow(int) in widget.o 
    "std::__1::basic_ios<char, std::__1::char_traits<char> >::basic_ios()", referenced from: 
     std::__1::basic_stringstream<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_stringstream(unsigned int) in widget.o 
ld: symbol(s) not found for architecture x86_64 
clang: error: linker command failed with exit code 1 (use -v to see invocation) 
make: *** [TestMagickApp.app/Contents/MacOS/TestMagickApp] Error 1 
19:43:22: The process "/usr/bin/make" exited with code 2. 
Error while building/deploying project TestMagickApp (kit: 4.8.5) 
When executing step 'Make' 

但是，只有当我尝试使用的libC++，如果我尝试发生使用libstdC++来代替它，它没有任何问题链接（但是如果我仍然想直接尝试使用任何功能，它应该会报错）。

我试过只包括某些文件，以缩小问题，它似乎是由这一段代码里面/usr/local/include/GraphicsMagick/magick/common.h造成的：

/* 
    Support for __attribute__ was added in GCC 2.0. It is not supported 
    in strict ANSI mode which is indicated by __STRICT_ANSI__ being 
    defined. 

    http://www.ohse.de/uwe/articles/gcc-attributes.html 

    Note that GCC 3.2 on MinGW does not define __GNUC__ or __GNUC_MINOR__. 

*/ 
#if !defined(__attribute__) 
# if (!defined(__GNUC__) || (__GNUC__ < 2 || __STRICT_ANSI__)) 
# define __attribute__(x) /*nothing*/ 
# else 
# if (((__GNUC__) > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1))) /* 3.1+ */ 
#  define MAGICK_FUNC_DEPRECATED __attribute__((__deprecated__)) 
# endif 
# if (__GNUC__ >= 3) /* 3.0+ */ 
#  define MAGICK_FUNC_MALLOC __attribute__((__malloc__)) 
# endif 
# if (((__GNUC__) > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3))) /* 3.3+ */ 
    /* Supports argument syntax like __attribute__((nonnull (1, 2))) but 
    don't know how to support non-GCC fallback. */ 
#  define MAGICK_FUNC_NONNULL __attribute__((__nonnull__)) 
# endif 
# if (((__GNUC__) > 3) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 5))) /* 2.5+ */ 
#  define MAGICK_FUNC_NORETURN __attribute__((__noreturn__)) 
# endif 
# if ((__GNUC__) >= 3) /* 2.96+ */ 
#  define MAGICK_FUNC_PURE __attribute__((__pure__)) 
# endif 
# if (((__GNUC__) > 3) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 7))) /* 2.7+ */ 
#  define MAGICK_FUNC_UNUSED __attribute__((__unused__)) 
# endif 
# if (((__GNUC__) > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3))) /* 3.3+ */ 
#  define MAGICK_FUNC_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__)) 
# endif 
# if (((__GNUC__) > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3))) /* 4.3+ */ 
#  define MAGICK_FUNC_ALLOC_SIZE_1ARG(arg_num) __attribute__((__alloc_size__(arg_num))) 
#  define MAGICK_FUNC_ALLOC_SIZE_2ARG(arg_num1,arg_num2) __attribute__((__alloc_size__(arg_num1,arg_num2))) 
#  define MAGICK_FUNC_HOT __attribute__((__hot__)) 
#  define MAGICK_FUNC_COLD __attribute__((__cold__)) 
#  define MAGICK_OPTIMIZE_FUNC(opt) __attribute__((__optimize__ (opt))) 
# endif 
# if (((__GNUC__) > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7))) /* 4.7+ */ 
#  define MAGICK_ASSUME_ALIGNED(exp,align) __builtin_assume_aligned(exp,align) 
#  define MAGICK_ASSUME_ALIGNED_OFFSET(exp,align,offset) __builtin_assume_aligned(exp,align,offset) 
# endif 
# endif 
#endif 

现在我真的不明白这个代码，但它似乎支持真正的旧编译器（GCC版本< 2 !!）。如果我评论整个部分，它似乎编译得很好，但由于我不知道它在做什么，评论它感觉有点冒险/奇怪，因为它是一个只读文件，它表明我应该无论如何，我估计不会真的搞乱它。

对于什么是值得的，使用GraphicsMagick的应用程序也使用Qt 4.8.5，并且我正在使用QtCreator和QMake，但我认为这不是相关的。我尝试了Qt 5.1和5.2，但没有运气。 （我知道这不是最新版本，但我宁愿不改变它）。

TL/DR：

有没有人有上的libC++编译GraphicsMagick工具的任何经验/反馈？

有人可以向我解释上面的代码是在做什么？当我评论它时为什么会起作用？

你能发现我做了什么错吗？我做了整个过程几次，但也许我忘了一些明显的...

任何帮助将是非常欢迎。

Answer 1

自上一个稳定版本（截至今日1.3.19）以来，clang的配置已被添加。从Mercurial建设解决了这个问题。