-m32と-m64の違いは何ですか？gccのオプションには何もありません。

Question

gcc -m32 main.cpp 

gcc -m64 main.cpp 

gcc main.cpp 

gccのオプションで-m32,-m64、およびnothingの違いは何ですか？

Answer 1

はhttps://gcc.gnu.org/onlinedocs（[here]、それはあなたが答えを見つけるために `男gcc`を実行するか、[ここで読む]でき

-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.