subst question

All, 

Another quick question. Does anyone know a way in GNU Make
to filter off the 
first instance only of a given string. 

For example, at the moment I'm doing 

$(subst lib,,libfoo.a) 

which gives me "foo.a". However if I do : 

$(subst lib,,libbarlib.a) 

this also gives me "bar.a" even though what I need
is "barlib.a". 

Any ideas ? 

Regards 

Brendan


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----- Original Message ----- 
From: "Brendan Heading" <brendanheadingclara.co.uk>
To: <help-makegnu.org>
Sent: Friday, January 26, 2007 12:00 PM
Subject: subst question

> All,
>
> Another quick question. Does anyone know a way in GNU
Make to filter off
the
> first instance only of a given string.
>
> For example, at the moment I'm doing
>
> $(subst lib,,libfoo.a)
>
> which gives me "foo.a". However if I do :
>
> $(subst lib,,libbarlib.a)
>
> this also gives me "bar.a" even though what I
need is "barlib.a".
>
> Any ideas ?

I guess it depends on what you mean with 'the first instance
only'. If you
only want to replace the first instance in a word (and do
this for every
word) and you're sure the string you want to replace is at
the beginning of
a word, you could use the patsubst function: something like
$(patsubst
lib%,%,libbarlib.a) will do what you want. A similar thing
can be done if
the string is at the end of the word.

If the string can be located anywhere in your word - for
instance lib in
'mylibgreatlib.a' and you only want the first lib to be
replaced, the only
thing I can think of is using stuff like sed in combination
with the shell
function. For instance something like this:

LIBS := mylibgreatlib.a something.a
LIBS := $(shell echo $(LIBS) | sed 's/lib//')
# LIBS now contains 'mygreatlib.a something.a'

I guess that's not a perfect solution, but it works 

Hope this helps,
Danny



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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Brendan Heading wrote:
> Another quick question. Does anyone know a way in GNU
Make to filter off
> the first instance only of a given string.
> For example, at the moment I'm doing
> $(subst lib,,libfoo.a)
> which gives me "foo.a". However if I do :
> $(subst lib,,libbarlib.a)
> this also gives me "bar.a" even though what I
need is "barlib.a".

Use patsubst: $(patsubst lib%,%,libbarlib.a) will give the
result you
are looking for.

John.

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On 26 January 2007 11:01, Brendan Heading wrote:

> All,
> 
> Another quick question. Does anyone know a way in GNU
Make to filter off the
> first instance only of a given string.
> 
> For example, at the moment I'm doing
> 
> $(subst lib,,libfoo.a)
> 
> which gives me "foo.a". However if I do :
> 
> $(subst lib,,libbarlib.a)
> 
> this also gives me "bar.a" even though what I
need is "barlib.a".
> 
> Any ideas ?

  How about

$(patsubst lib%,%,libbarlib.a)


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....



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John Graham-Cumming writes: 

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1 
> 
> Brendan Heading wrote:
>> Another quick question. Does anyone know a way in
GNU Make to filter off
>> the first instance only of a given string.
>> For example, at the moment I'm doing
>> $(subst lib,,libfoo.a)
>> which gives me "foo.a". However if I do
:
>> $(subst lib,,libbarlib.a)
>> this also gives me "bar.a" even though
what I need is "barlib.a".
> 
> Use patsubst: $(patsubst lib%,%,libbarlib.a) will give
the result you
> are looking for.

Thanks everyone, that did exactly what I needed. 

Regards 

Brendan 




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