GNU Octave 编译失败，并显示 libinterp/.libs/liboctinterp.so: undefined reference to `Magick::*

Question 1

这里有同样的错误，但上面有关于冲突库的警告，这是有用的线索。

/usr/local/gcc-6.4.0_binutils-2.28.1_isl/lib64/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../x86_64-pc-linux-gnu/bin/ld: warning: libjpeg.so.8, needed by /usr/lib/../lib64/libtiff.so, may conflict with libjpeg.so.62
libinterp/.libs/liboctinterp.so: undefined reference to `Magick::Image::ping(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
libinterp/.libs/liboctinterp.so: undefined reference to `Magick::Image::attribute(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
libinterp/.libs/liboctinterp.so: undefined reference to `Magick::CoderInfo::description[abi:cxx11]() const'
libinterp/.libs/liboctinterp.so: undefined reference to `Magick::Image::comment[abi:cxx11]() const'
libinterp/.libs/liboctinterp.so: undefined reference to `Magick::Image::magick[abi:cxx11]() const'
libinterp/.libs/liboctinterp.so: undefined reference to `Magick::CoderInfo::CoderInfo(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'

Magick::Image::ping预计会在 c++ 库中，让我们检查一下使用了哪一个：

ldd libinterp/.libs/liboctinterp.so | grep -i magick++
        libGraphicsMagick++.so.12 => /usr/local/gcc-6.4.0_binutils-2.28.1_isl/lib64/libGraphicsMagick++.so.12 (0x00007faa870ab000)

但Magick::Image::ping确实存在：

nm -C /usr/local/gcc-6.4.0_binutils-2.28.1_isl/lib64/libGraphicsMagick++.so | grep ping
000000000004c7a0 T Magick::Image::ping(Magick::Blob const&)
000000000004c740 T Magick::Image::ping(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)

因此，某些东西阻止了链接器正确使用它。

libGraphicsMagick++.so 很好的另一个线索：具有相同的建造程序，相同的库，八度稳定分支构建良好，而开发分支失败。

让我们认真对待之前的警告。其实是已经注意到那

请注意，在 openSUSE 12.04 和 13.02 中，libjpeg-devel 软件包会导致安装 libjpeg62.so，这可能与同时安装的 libjpeg8.so 发生冲突。这就是为什么我们建议不要安装 libjpeg-devel，而是安装 libjpeg8-devel。

libjpeg62-devel必须被取代，因为有几个包依赖于jpeglibjpeg8-devel库。

以下命令是在 openSUSE 42.2 上发出的。

sudo zypper install libjpeg8-devel

Problem: libjpeg62-devel-62.2.0-35.3.1.x86_64 conflicts with namespace:otherproviders(libjpeg-devel) provided by libjpeg8-devel-8.1.2-119.5.x86_64
Solution 1: deinstallation of libjpeg62-devel-62.2.0-35.3.1.x86_64
Solution 2: do not install libjpeg8-devel-8.1.2-119.5.x86_64

Choose from above solutions by number or cancel [1/2/c] (c): 1

The following NEW package is going to be installed:
libjpeg8-devel

The following package is going to be REMOVED:
libjpeg62-devel

1 new package to install, 1 to remove.
Overall download size: 110.8 KiB. Already cached: 0 B. After the operation, additional 63.6 KiB will be used.
Continue? [y/n/...? shows all options] (y):

但 jpeg 库仍然存在。让我们找到这个包：

zypper se -f /usr/lib64/libjpeg.so.62.2.0
+ | libjpeg62 | The MMX/SSE accelerated JPEG compression/decompression library | package

删除库：

sudo zypper rm libjpeg62
The following package is going to be REMOVED:
libjpeg62

然后重建GraphicsMagick-1.3.28，安装。八度音阶构建现已通过。

Answer