【C++】统计代码覆盖率(四) – 补充

centos6系列
# wget https://www.softwarecollections.org/repos/rhscl/devtoolset-3/epel-6-x86_64/noarch/rhscl-devtoolset-3-epel-6-x86_64-1-2.noarch.rpm
# rpm -ivh rhscl-devtoolset-3-epel-6-x86_64-1-2.noarch.rpm
# wget https://copr.fedoraproject.org/coprs/rhscl/devtoolset-3/repo/epel-6/rhscl-devtoolset-3-epel-6.repo && mv ./*.repo /etc/yum.repos.d/
centos7系统
# wget https://www.softwarecollections.org/repos/rhscl/devtoolset-3/epel-7-x86_64/noarch/rhscl-devtoolset-3-epel-7-x86_64-1-2.noarch.rpm
# rpm -ivh rhscl-devtoolset-3-epel-7-x86_64-1-2.noarch.rpm

yum --disablerepo='*' --enablerepo='rhscl-devtoolset-3' install devtoolset-3-gcc devtoolset-3-gcc-c++ devtoolset-3-toolchain -y
# 如果报错见 报错与解决 部分

scl enable devtoolset-3 bash #类似于python虚拟环境，不影响其他版本使用者
或者如下：
find / -name "devtoolset-3"   # 找到 devtoolset-3 的安装目录
[root@105 /opt/rh]$ source devtoolset-3/enable   # 激活
[root@105 /opt/rh]$ gcc -v
Using built-in specs.
...
gcc version 4.9.2 20150212 (Red Hat 4.9.2-6) (GCC)

# export CC=/opt/rh/devtoolset-3/root/usr/bin/gcc
# export CPP=/opt/rh/devtoolset-3/root/usr/bin/cpp
# export CXX=/opt/rh/devtoolset-3/root/usr/bin/c++

utest = ARGUMENTS.get('utest', 'true')
if utest == 'true':
   env['CXXFLAGS'] += ['-DUTEST']
   env['CXXFLAGS'] += ['-fprofile-arcs']
   env['CXXFLAGS'] += ['-ftest-coverage']
   env.Append(dynamic_libs='-Lartifacts/lib -lcares -Wl,-Bdynamic -lgcov -lm -lc -lrt -ldl')   #主要是这几句
else:
   env.Append(dynamic_libs='-Lartifacts/lib -lcares -Wl,-Bdynamic -lm -lc -lrt -ldl')

-rw-r--r--. 1 root root  172K Jun  8 10:19 fb.gcno   #源文件，与gcda合并可统计到覆盖率
-rw-r--r--. 1 root root  1.3M Jun  8 10:19 fb.o
-rwxr-xr-x. 1 root root   42M Jun  8 10:22 fb        # 可执行文件

artifacts/bin/lcov/usr/bin/lcov -b ./ --capture --directory src --gcov-tool gcov --output-file alla.info
lcov命令装在了 artifacts...目录下
-b 指定 base directory，后面的文件需要在这个目录内
--capture Capture coverage data 捕获 

[root@localhost# scons -D .
...
gevent-1.1.2-cp27-cp27mu-manylinux1_x86_64.whl is not a supported wheel on this platform.
usage: easy_install [options] requirement_or_url ...
   or: easy_install --help

Can not perform a '--user' install. User site-packages are not visible in this virtualenv.

[root@105 ...]$ scons -D . 
...
cc1plus: error: -fsanitize=address and -fsanitize=kernel-address are incompatible with -fsanitize=thread
scons: *** [src/***.o] Error 1
scons: building terminated because of errors.

/opt/xiaoming/workspace/tool/workspace/tool.cpp:152: undefined reference to `__asan_before_dynamic_init'
/opt/xiaoming/workspace/tool.cpp:15: undefined reference to `__ubsan_handle_type_mismatch'
/opt/xiaoming/workspace/tool.cpp:15: undefined reference to `__ubsan_handle_add_overflow'
/opt/xiaoming/workspace/tool.cpp:15: undefined reference to `__ubsan_handle_type_mismatch'

1 我已经安装了 libubsan0 和 lib64ubsan0 并添加了 -lubsan 选项，并且我的应用程序已成功编译！
2 "GCC recently (version 4.9) gained Undefined Behavior Sanitizer (ubsan), a run-time checker for the C and C++ languages. In order to check your program with ubsan, compile and link the program with -fsanitize=undefined option."
将-fsanitize=undefined传递给了meson.add_project_arguments()，但是 那些只交给编译器； 我还需要将其传递给meson.add_project_link_arguments()。 添加之后，错误消失了，程序链接了。

build_type = ARGUMENTS.get('build', 'debug')
if build_type.lower() == 'debug':
  env['CXXFLAGS'] += ['-g']
  #env['CXXFLAGS'] += ['-fsanitize=address']  
  #env['CXXFLAGS'] += ['-fsanitize=thread']    #注释掉以防编译冲突
  #env['CXXFLAGS'] += ['-fno-omit-frame-pointer']
  #env['CXXFLAGS'] += ['-fsanitize=leak']
  #env['CXXFLAGS'] += ['-fsanitize=undefined']
else:
  env['CXXFLAGS'] += ['-O3']

[root@105 /opt/xiaoming/workspace]$ artifacts/bin/lcov/usr/bin/lcov -b ./ --capture --directory src --gcov-tool /usr/bin/gcov --output-file alla.info
Capturing coverage data from src
Found gcov version: 4.4.7
Scanning src for .gcda files ...
Found 49 data files in src
Processing ssp_service_v2/preload_session.gcda
Auto-detected compatibility mode for split checksum .gcno file format
/opt/xiaoming/***.gcno:version '409R', prefer '404R'

out of memory allocating 25868243408 bytes after a total of 14941280 bytes    # 报错
geninfo: ERROR: GCOV failed for /opt/xiaoming/***.gcda!

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::program_options::unknown_option> >'
  what():  unrecognised option
Aborted (core dumped)