linker and loader

LD.SO(8)                                                              LD.SO(8)

NAME
       ld.so/ld-linux.so - dynamic linker/loader

DESCRIPTION
       ld.so loads the shared libraries needed by a program, prepares the pro‐
       gram to run, and then runs it.  Unless  explicitly  specified  via  the
       -static  option to ld during compilation, all Linux programs are incom‐
       plete and require further linking at run time.

       The necessary shared libraries needed by the program are  searched  for
       in the following order

       o      Using      the      environment     variable     LD_LIBRARY_PATH
              (LD_AOUT_LIBRARY_PATH for a.out programs).  Except if  the  exe‐
              cutable is a setuid/setgid binary, in which case it is ignored.

       o      From  the  cache file /etc/ld.so.cache which contains a compiled
              list of candidate libraries previously found  in  the  augmented
              library path.

       o      In the default path /lib, and then /usr/lib.

 

动态链接,加载

(This library component is not itself a library. Instead, ld.so is an executable invoked by the ELF binary format loader to load the dynamically linked libraries into an application’s memory space.)

 

-------------------------------------------------------------------------------

LDD(1)                                                                  LDD(1)

NAME
       ldd - print shared library dependencies

-------------------------------------------------------------------------------

LD(1)                        GNU Development Tools                       LD(1)

NAME
       ld - The GNU linker

SYNOPSIS
       ld [options] objfile ...

DESCRIPTION
       ld combines a number of object and archive files, relocates their data
       and ties up symbol references. Usually the last step in compiling a
       program is to run ld.

       ld accepts Linker Command Language files written in a superset of
       AT&T's Link Editor Command Language syntax, to provide explicit and
       total control over the linking process.

 

链接器,编译最后一步:

ld other-command-line-options /tmp/a.o /tmp/b.o -o a.out
 
 
参考:
http://en.wikipedia.org/wiki/Linker_(computing)
Linkers and Loaders by Sandeep Grover
 
 
http://en.wikipedia.org/wiki/Loader_(computing)#cite_note-0

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