如果對象模塊將在共享庫中使用,則始終需要“位置獨立代碼”。它高度依賴于平臺,并且會產生一些開銷。
您必須在amd64而不是x386上顯式指定它的原因只是它恰好是x86的默認值,而不是amd64。
還要注意“-fpic”和“-fpic”之間的區別:
dockerfile指令、-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
linux內核源碼,(GOT). The dynamic loader resolves the GOT entries when the pro-
gram starts (the dynamic loader is not part of GCC; it is part
of the operating system). If the GOT size for the linked execu-
table exceeds a machine-specific maximum size, you get an error
cmake 靜態庫鏈接靜態庫?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.)
linux移動文件命令、Position-independent code requires special support, and there
fore 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.
centos抓包?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
vim查詢模式、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.
linux基本命令的使用?When this flag is set, the macros __pic__ and __PIC__ are defined to 2.
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