lin-aout.c

开源的nasm编译器源码,研究编译器原理很有帮且

/* x86 running linux and using nasm as a.out */

#include <string.h>

#ifndef LCCDIR
#define LCCDIR "/usr/local/lib/lcc/"
#endif

#define NASMPATH "/usr/local/bin/nasm"

char *cpp[] = { LCCDIR "cpp", "-D__STDC__=1",
	"-Di386", "-D__i386", "-D__i386__",
	"-Dlinux", "-D__linux", "-D__linux__",
	"-Dunix", "-D__unix", "-D__unix__",
	"$1", "$2", "$3", 0 };
char *include[] = { "-I" LCCDIR "include", "-I/usr/local/include",
	"-I/usr/include", 0 };
char *com[] = { LCCDIR "rcc", "-target=x86/nasm",
	"$1", "$2", "$3", 0 };
char *as[] = { NASMPATH, "-a", "-faout", "-o", "$3", "$1", "$2", 0 };
char *ld[] = { "/usr/bin/ld", "-m", "i386linux",
	"-L/usr/i486-linuxaout/lib",
	"-o", "$3", "$1",
	"/usr/i486-linuxaout/lib/crt0.o",
	"$2", "", "-lc", 0 };
static char *bbexit = LCCDIR "bbexit.o";

extern char *concat(char *, char *);
extern int access(const char *, int);

int option(char *arg) {
	if (strncmp(arg, "-lccdir=", 8) == 0) {
		cpp[0] = concat(&arg[8], "/cpp");
		include[0] = concat("-I", concat(&arg[8], "/include"));
		com[0] = concat(&arg[8], "/rcc");
		bbexit = concat(&arg[8], "/bbexit.o");
	} else if (strcmp(arg, "-g") == 0)
		;
	else if (strcmp(arg, "-b") == 0 && access(bbexit, 4) == 0)
		ld[9] = bbexit;
	else
		return 0;
	return 1;
}