Mail Archives: djgpp/2008/01/14/05:15:32
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Date: | Mon, 14 Jan 2008 11:14:20 +0100
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From: | linus <linus AT yahoo DOT com>
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User-Agent: | Thunderbird 2.0.0.6 (X11/20071022)
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | gcc as a linker....
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Lines: | 41
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To: | djgpp AT delorie DOT com
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I 've compiled with nasm the code below and linked with your gcc...
What does it mean these errors ? (the environment is Win XP ).
Sorry, I am a beginner...gcc can be used as a linker ?
Thanks a lot.
C:\> gcc -oEXE hello.obj
c:/djgpp/lib/crt0.o:crt0.s:(.data+0xc2): undefined reference to `_main'
c:/djgpp/lib/libc.a(crt1.o):crt1.c:(.text+0x404): undefined reference to
`_main'
collect2: ld returned 1 exit status
************************************************************************************
SECTION .data ; data section
msg: db "Hello World",10 ; the string to print, 10=cr
len: equ $-msg ; "$" means "here"
; len is a value, not an address
SECTION .text ; code section
; global main ; make label available to linker
;main: ; standard gcc entry point
mov edx,len ; arg3, length of string to print
mov ecx,msg ; arg2, pointer to string
mov ebx,1 ; arg1, where to write, screen
mov eax,4 ; write sysout command to int 80 hex
int 0x80 ; interrupt 80 hex, call kernel
mov ebx,0 ; exit code, 0=normal
mov eax,1 ; exit command to kernel
int 0x80 ; interrupt 80 hex, call kernel
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