Re: AS_IF optimization (was: AC_TRY_COMPILE() annoyances with 2.63b)

[Andreas Schwab]

Eric Blake <address@hidden> writes:

> According to Andreas Schwab on 4/7/2009 3:47 AM:
>>>From the autoconf manual:
>>
>>      There are shells that do not reset the exit status from an `if':
>>
>>           $ if (exit 42); then true; fi; echo $?
>>           42
>>
>>      whereas a proper shell should have printed `0'.
>
> Which shells?  Solaris /bin/sh passed this test (to my surprise, since if
> fails the similar test for 'case `false` in *);; esac').  Even cygwin's
> super-old ash passed this, although it falls flat on a number of other
> constructs.  Could this be a case of urban legend?

According to <http://www.in-ulm.de/~mascheck/bourne/> this was fixed in
the System III shell.

Andreas.

-- 
Andreas Schwab, address@hidden
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