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Re: m4: doing arithmetic on macro arguments
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From: |
Paul Jarc |
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Subject: |
Re: m4: doing arithmetic on macro arguments |
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Date: |
Tue, 23 Nov 2004 10:54:39 -0500 |
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User-agent: |
Gnus/5.110003 (No Gnus v0.3) Emacs/21.3 (gnu/linux) |
Haakon Nilsen <haakonn@gmail.com> wrote:
> m4_define(`_FOO', m4_incr($1))
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> I want _FOO(1) to expand into "2", for instance.
m4_define(`_FOO', `m4_incr($1)')
The second argument to m4_define is macro-expanded before m4_define
sees it, so you have to quote it. Then when _FOO is expanded later,
its replacement text will be rescanned for macros, so as long as you
have only one level of quoting, m4_incr will be expanded then.
paul