C 语言怎样在预编译期确定系统是 32 位还是 64 位的？ - V2EX
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C 语言怎样在预编译期确定系统是 32 位还是 64 位的？

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  •   xia0ta0 Jul 2, 2014 2249 views
    This topic created in 4333 days ago, the information mentioned may be changed or developed.
    只能使用各个编译器提供的宏吗？比如GCC的 __LP64__
  • 编译器
  • 编译
  • GCC
    4 replies    2014-07-02 11:25:24 +08:00
    missdeer
        1
    missdeer  
       Jul 2, 2014
    你都说是在预编译期了，不用宏用什么
    madeye
        2
    madeye  
       Jul 2, 2014   1
    配合 configure 脚本或者 Makefile
    xia0ta0
        3
    xia0ta0  
    OP
       Jul 2, 2014
    @madeye 多谢，我在Makefile里试试
    xia0ta0
        4
    xia0ta0  
    OP
       Jul 2, 2014
    已解决
    在Makefile定义ARCH = $(shell getconf LONG_BIT) ，然后CFLAGS += -D向代码传递宏定义就可以了
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