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报错C++11 is required to use dlib
1.错误原因
在使用pip install dlib安装dlib的时候报错，
错误的详细信息如下：
ERROR: Command errored out with exit status 1:
command: /root/miniconda3/envs/cv_1/bin/python -u -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘"’"’/tmp/pip-install-jpjqw_8i/dlib_a6680215d7d4421581b7b4999664056c/setup.py’"’"’; file=’"’"’/tmp/pip-install-jpjqw_8i/dlib_a6680215d7d4421581b7b4999664056c/setup.py’"’"’;f=getattr(tokenize, ‘"’"‘open’"’"’, open)(file);code=f.read().replace(’"’"’\r\n’"’"’, ‘"’"’\n’"’"’);f.close();exec(compile(code, file, ‘"’"‘exec’"’"’))’ bdist_wheel -d /tmp/pip-wheel-pi50j_zu
cwd: /tmp/pip-install-jpjqw_8i/dlib_a6680215d7d4421581b7b4999664056c/
Complete output (76 lines):
running bdist_wheel
running build
running build_py
package init file ‘tools/python/dlib/init.py’ not found (or not a regular file)
running build_ext
Building extension for Python 3.6.13 |Anaconda, Inc.| (default, Jun 4 2021, 14:25:59)
Invoking CMake setup: ‘cmake /tmp/pip-install-jpjqw_8i/dlib_a6680215d7d4421581b7b4999664056c/tools/python -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/tmp/pip-install-jpjqw_8i/dlib_a6680215d7d4421581b7b4999664056c/build/lib.linux-x86_64-3.6 -DPYTHON_EXECUTABLE=/root/miniconda3/envs/cv_1/bin/python -DCMAKE_BUILD_TYPE=Release’
– The C compiler identification is GNU 11.2.0
– The CXX compiler identification is GNU 4.8.5
– Detecting C compiler ABI info
– Detecting C compiler ABI info - done
– Check for working C compiler: /usr/bin/cc - skipped
– Detecting C compile features
– Detecting C compile features - done
– Detecting CXX compiler ABI info
– Detecting CXX compiler ABI info - done
– Check for working CXX compiler: /usr/bin/c++ - skipped
– Detecting CXX compile features
– Detecting CXX compile features - done
– Found PythonInterp: /root/miniconda3/envs/cv_1/bin/python (found version “3.6.13”)
– Found PythonLibs: /root/miniconda3/envs/cv_1/lib/libpython3.6m.so
– Performing Test HAS_CPP14_FLAG
– Performing Test HAS_CPP14_FLAG - Failed
– Performing Test HAS_CPP11_FLAG
– Performing Test HAS_CPP11_FLAG - Success
– pybind11 v2.2.4
– Using CMake version: 3.21.2
– Compiling dlib version: 19.23.0
CMake Error at /tmp/pip-install-jpjqw_8i/dlib_a6680215d7d4421581b7b4999664056c/dlib/cmake_utils/set_compiler_specific_options.cmake:50 (message):
C++11 is required to use dlib, but the version of GCC you are using is too
old and doesn’t support C++11. You need GCC 4.9 or newer.
Call Stack (most recent call first):
/tmp/pip-install-jpjqw_8i/dlib_a6680215d7d4421581b7b4999664056c/dlib/cmake_utils/test_for_sse4/CMakeLists.txt:8 (include)
接下来我们找错误提示的重点信息：
C++11 is required to use dlib, but the version of GCC you are using is too
old and doesn’t support C++11. You need GCC 4.9 or newer.
2.原因分析
从错误信息上来看是由于gcc的版本低于4.9导致无法支持C++ 11，查看gcc的版本
#查看gcc的版本信息 gcc --version :' gcc (GCC) 11.2.0 Copyright (C) 2021 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. '
从输出的gcc版本信息来看，不应该出错呀，因为gcc的版本已经大于4.9了。
出错的原因在于安装dlib的时候使用了conda的虚拟环境，而在环境内有一个低于4.9的gcc，而默认使用的正是这个版本，所以导致出错了。
3.解决办法
改变conda环境下的gcc版本：
1.查看conda环境下的gcc版本
gcc --version或gcc -v
2.替换gcc的版本
利用软连接来覆盖conda环境下的gcc版本
命令如下：
ln -s /usr/local/bin/gcc /home/name/anconda3/envs/env_name/bin/gcc
找不到conda中安装的gcc：
我就属于这种情况，在conda中找不到任何关于gcc的信息，在conda环境下使用gcc -v输出的版本也和没有使用conda环境输出的版本信息一致。
1.找到gcc的安装位置
which gcc #/usr/local/bin/gcc
2.导入环境变量
#激活conda环境 source activate cv #设置环境变量 export CC=/usr/local/bin/gcc
终极解决办法：
在环境外编译dlib的源码，生成whl文件，然后再环境内通过whl文件来安装dlib，
步骤如下：
#clone dlib的源码 git clone https://github.com/davisking/dlib.git #编译dlib mkdir build; cd build; cmake .. ; cmake --build . #安装python版本的dlib python setup.py install
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