gcc -m32 main.cpp
gcc -m64 main.cpp
gcc main.cpp
-m32
、-m64
和nothing
在gcc选项中有什么区别?
gcc -m32 main.cpp
gcc -m64 main.cpp
gcc main.cpp
-m32
、-m64
和nothing
在gcc选项中有什么区别?
请参考gcc手册页面[这里],它指出
-m32 -m64 Generate code for a 32-bit or 64-bit environment.
The 32-bit environment sets int, long and pointer to 32 bits and
generates code that runs on any i386 system.
The 64-bit environment sets int to 32 bits and long and pointer to
64 bits and generates code for AMD 's x86-64 architecture.
For darwin only the -m64 option turns off the -fno-pic and -mdynamic-no-pic options.
man gcc
来查找答案,或者在这里阅读。默认使用的标志由编译器构建时的配置方式确定,通常意味着在64位环境下使用 -m64 标志。 - Margaret Bloom