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gcc-4.4.1
1. gcc 默认库搜索目录:
$ gcc -print-search-dirs 安装:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/ 程序:=/usr/libexec/gcc/x86_64-redhat-linux/4.5.1/:/usr/libexec/gcc/x86_64-redhat-linux/4.5.1/:/usr/libexec/gcc/x86_64-redhat-linux/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/:/usr/lib/gcc/x86_64-redhat-linux/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../x86_64-redhat-linux/bin/x86_64-redhat-linux/4.5.1/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../x86_64-redhat-linux/bin/ 库:=/usr/lib/gcc/x86_64-redhat-linux/4.5.1/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../x86_64-redhat-linux/lib/x86_64-redhat-linux/4.5.1/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../x86_64-redhat-linux/lib/../lib64/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../x86_64-redhat-linux/4.5.1/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../lib64/:/lib/x86_64-redhat-linux/4.5.1/:/lib/../lib64/:/usr/lib/x86_64-redhat-linux/4.5.1/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../x86_64-redhat-linux/lib/:/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../:/lib/:/usr/lib/
2.gcc 的参数收录:
gcc [-c 编译,不连接] [-S] [-E] [-std] [-g 加入调试信息] [-pg加入剖析信息] [-Olevel]
[-W 警告设置] [-pedantic 发出所有标准C列出的警告] [-Idir 添加包含目录到搜索列表中] [-Ldir添加库目录到搜索列表中]
[-D] [-U] [-f] [-m] [-o 编译到可执行文件,并作一些优化]...
说明:
-w 关闭所有警告设置
-Wall 允许发出所有警告
-werror 把所有警告转化为错误
-v 显示编译过程中的每一步用到的命令
-ggdb 在可执行程序中包含大量的调试信息
-MM 输出一个make兼容的相关列表
-O 优化编译过的代码
-fsyntax-only 只检查语法,其他都不做
-save-temps 保存编译过程中产生的中间文件
-Q 编译器输出编译每个函数时所花的时间信息
gcc的优化选项:
-O等价于-O1,并且包含线程直接跳转和迟延堆栈这两种优化。
-O2包含了-O1的优化选项,并增加了一些额外的调整,如包含对处理器指令调度的调整。
-O3也类似
gcc的调试选项:
-g == -g2,该级别包括扩展符号表、行号、以及局部变量或外部变量。-g3除了包含-g2的信息外,还包含了源代码中定义的宏.
2022年8月20日 16:48
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