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Re: Portable Use of Variables
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From: |
Eric Blake |
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Subject: |
Re: Portable Use of Variables |
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Date: |
Mon, 27 Oct 2014 12:29:59 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 |
On 10/27/2014 11:11 AM, Nick Bowler wrote:
> On 2014-10-26 22:15 +0200, fr33domlover wrote:
>> I'm a bit confused about all the expressive features and ways to use makefile
>> variables, so just to be sure -
>>
>> http://www.gnu.org/software/make/manual/html_node/Substitution-Refs.html
>>
>> Are these uses of variables portable, or should a portable Makefile.am use
>> only
>> the plain $(var) form without the tricks?
>
> The first form of expansion on that page, $(var:.a=.b), should be OK.
> They are standard in POSIX and work on all make implementations that I
> know of.
>
> The version with % characters is not portable.
That said, POSIX is hoping to standardize it in the next few years:
http://austingroupbugs.net/view.php?id=519
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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