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Subject: Re: [Boost-build] Doc build failure on release branch
From: Ryo IGARASHI (rigarash_at_[hidden])
Date: 2008-11-09 04:27:46


On Thu, Oct 9, 2008 at 11:21 PM, Steve M. Robbins <steve_at_[hidden]> wrote:
> On Thu, Oct 09, 2008 at 09:36:15AM +0400, Vladimir Prus wrote:
>> In fact, the original
>> return "$(variable)=$(value)$(nl)export $(variable)$(nl)" ;
>> probably is too complex, as
>> return "export $(variable)=$(value)$(nl)" ;
>> should work everywhere, too.
> Actually, it is the first formulation that is more portable.
> The second works in Bash (and perhaps other shells) but not in the
> original Bourne shell. I'm not sure whether cygwin can be installed
> with /bin/sh as something other than bash, but it's safer to use the
> original IMHO.

As an example, even on Solaris 10, the default shell (/bin/sh) fails when
$ export TEST=test
is executed.

To be portable but does not want to use newline, you can use

return "$(variable)=$(value); export $(variable)$(nl)" ;

(I don't know whether I can safely use semicolons inside double quotes)

Best regards,


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