zoukankan      html  css  js  c++  java
  • gcc fpic fPIC

    gcc中代码生成的选项有很多。

    fipc和fPIC用于规定生成位置无关的可执行档。

    小写的fpic比大写的fPIC条件更加严格, 它需要通过GOT来访问常量,而大写的不需要PIC。

    -fpic

    Generate position-independent code (PIC) suitable for use in a shared library,
    if supported for the target machine. Such code accesses all constant addresses
    through a global offset table (GOT). The dynamic loader resolves the GOT
    entries when the program starts (the dynamic loader is not part of GCC; it
    is part of the operating system). If the GOT size for the linked executable
    exceeds a machine-specific maximum size, you get an error message from the
    linker indicating that ‘-fpic’ does not work; in that case, recompile with ‘-fPIC’
    instead. (These maximums are 8k on the SPARC and 32k on the m68k and
    RS/6000. The 386 has no such limit.)
    Position-independent code requires special support, and therefore works only on
    certain machines. For the 386, GCC supports PIC for System V but not for the
    Sun 386i. Code generated for the IBM RS/6000 is always position-independent.
    When this flag is set, the macros __pic__ and __PIC__ are defined to 1.

    -fPIC

    If supported for the target machine, emit position-independent code, suitable
    for dynamic linking and avoiding any limit on the size of the global offset table.
    This option makes a difference on the m68k, PowerPC and SPARC.
    Position-independent code requires special support, and therefore works only
    on certain machines.
    When this flag is set, the macros __pic__ and __PIC__ are defined to 2.

    gcc manual 

    3.18 Options for Code Generation Conventions

  • 相关阅读:
    vue打包不显示或图片不显示配置
    Vue::is特性用法
    毕业实习报告
    前端vscode常用快捷键总结
    1. 变量常量
    信息收集之CMS指纹识别
    4. EIGRP的复合度量值
    3. EIGRP报文,三张表,邻居建立
    信息收集之目录扫描
    2. EIGRP路由单播邻居和被动接口
  • 原文地址:https://www.cnblogs.com/merlindu/p/7522009.html
Copyright © 2011-2022 走看看