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Date:      Wed, 5 May 1999 21:36:38 -0400 (EDT)
From:      Zhihui Zhang <zzhang@cs.binghamton.edu>
To:        freebsd-hackers@freebsd.org
Subject:   What is define(...)dnl in a .m4 file
Message-ID:  <Pine.GSO.3.96.990505213113.11828C-100000@sol.cs.binghamton.edu>

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I find in the file boot1.m4 under /usr/src/sys/boot the following line:

define(_bp_,0x6)dnl
define(_bx_,0x7)dnl
define(o16,`.byte 0x66')dnl
define(addbr1,`.byte 0x0; .byte 0x40 | ($1 << 0x3) | $3; .byte $2')dnl 

I assume boot1.m4 is an assembly file but I can not find any information
on define(...)dnl in the GNU Assembler manual (info files).

Please tell me how a .m4 file is used and what does "define" mean exactly. 

Thanks for your help.

--------------------------------------------------
Zhihui Zhang.  Please visit http://www.freebsd.org
--------------------------------------------------



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