From: arg AT whangomatic DOT freeserve DOT co DOT uk (Andrew R. Gillett)
Newsgroups: comp.os.msdos.djgpp
Subject: -Wall - position on command line
Date: Wed, 2 Jun 1999 18:47:05 +0100
Organization: www.release-dates.co.uk
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When linking my program, if I use the command line:

gpp main.o battle.o unit.o music.o -o f_alli.exe -ljgmod -lalleg -Wall

it would give no warnings.


However, if I use:

gpp main.o battle.o unit.o music.o -o -Wall f_alli.exe -ljgmod -lalleg

I get loads of multiple definition errors, e.g.


f_alli.exe(.data+0xac):crt0.s: multiple definition of `active_page'
main.o(.data+0x8):main.cpp: first defined here
f_alli.exe(.text+0x4a8):crt0.s: multiple definition of 
`timer_interrupt(...)'
main.o(.text+0x0):main.cpp: first defined here
f_alli.exe(.text+0x1d8):crt0.s: multiple definition of `__exit'
c:/tools/djgpp/lib/crt0.o(.text+0x1d8):crt0.s: first defined here
f_alli.exe(.data+0xb0):crt0.s: multiple definition of `visual_page'
main.o(.data+0xc):main.cpp: first defined here
f_alli.exe(.text+0x4740):battle.cpp: multiple definition of 
`world_class::scroll_terrain(void)'
battle.o(.text+0x21ec):battle.cpp: first defined here


Why does it matter where the -Wall switch goes on the command line, and 
where did all these multiple definition errors come from?

-- 
Andrew Gillett      http://argnet.fatal-design.com/     ICQ: See homepage
You will meet a tall dark stranger. Unfortunately he's holding a large gun.
Run for it!