10-13-2009
Need more info on internals of c compilers
Hello Gurus,
i am ok with the concepts of c language but i would like to know
more about the internals of c with respect to the compilers
what happens when we say
gcc filename.c
the a.out will get created(what actaully compiler does to the code inaddition to generating object code)
gcc -c filename.c ( )
creates only .o files we need to link them to get a.out(i need extra)
gcc -o fn filename.c ( )
request you to provide me the more info on following
symbol table( how the linker actually uses this info),virtual address(what is this why its needed), physical address(what is this why its needed),linker,loading,locating.
expecting the above with repect to the gcc compilers
thanks in advance
either links or some descrption i am expecting
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LEARN ABOUT NETBSD
__kernel_rcsid
CDEFS(3) BSD Library Functions Manual CDEFS(3)
NAME
cdefs -- common definitions and macros
SYNOPSIS
#include <sys/cdefs.h>
DESCRIPTION
The <sys/cdefs.h> header includes some common definitions and macros typical to the C language conventions of NetBSD. Among these are:
o Certain C language properties and definitions that are versioned according to the support in compilers. Examples include the
__func__ keyword and the restrict type qualifier from C99.
o Macros and definitions specific to compilers, preprocessors, and linkers; see __CONCAT(3), __UNCONST(3), __insn_barrier(3), and
attribute(3).
o Utility macros provided for convenience; see __arraycount(3) and bits(3).
The header also contains the __RCSID() and __KERNEL_RCSID() macros used for version control system (VCS) identifiers. Thus, all NetBSD
source code files typically include <sys/cdefs.h>, included as the first thing right after any possible copyright texts;
/*-
* Copyright (c) 1984 John Doe
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: cdefs.3,v 1.3 2011/04/08 07:55:04 jruoho Exp $");
It is possible to identify the RCS keyword strings by using ident(1).
SEE ALSO
ident(1), param(3), stddef(3), types(3), c(7)
HISTORY
The <sys/cdefs.h> header was originally imported from 386BSD.
BSD
April 8, 2011 BSD