-isystem dir Search dir for header files, after all directories specified by -I but before the standard system directories. Mark it as a system directory, so that it gets the same special treatment as is applied to the standard system directories. If dir begins with "=", then the "=" will be …

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一、gdb 无法自动加载当前文件 .gdbinit文件 提示： warning: File “/home/heidong/privt/proj/osv6/.gdbinit” auto-loading has been declined by your `auto-load safe-path' set to “$debugdir:$datadir/auto-load”. To enable execution of this file add add-auto-load-safe-path /home/heidong/privt/proj/osv6/.gdbinit line to …

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代码覆盖率是单元测试的一个指标，通常覆盖率越高，单元测试就做得更完备。（然而，覆盖率是不是和软件质量成正比关系呢？）gcov是GNU工具链中

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