[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: string manipulation : removing a part of a string

From: Eric Blake
Subject: Re: string manipulation : removing a part of a string
Date: Thu, 14 Jun 2012 17:44:07 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1

On 06/14/2012 05:36 PM, Vincent Torri wrote:
> Hey
> I pass -Wno-foo as a parameter of an m4 macro. What I would like is to
> store into a variable -Wfoo, so removing 'no-'
> Is it possible with the m4 macro string manipulation ? If not, what's
> the best solution ?

m4_bpatsubst([[$1]], [no-])

will delete the first instance of the regular expression 'no-' (if any)
from parameter $1.  Yes, the first argument is double-quoted, so that
the output of m4_bpatsubst will still be single-quoted.

> Another related question: if I pass -Wbar, I would like to know if it
> begins by '-Wno-'. How can I do that with m4 ?

m4_if(m4_index([$1], [-Wno-]), 0, [yes...], [no...])

Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library

Attachment: signature.asc
Description: OpenPGP digital signature

reply via email to

[Prev in Thread] Current Thread [Next in Thread]