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Adding autoconf, replies can drop m4-patches
According to Gary V. Vaughan on 9/11/2007 1:15 PM:
Hi Gary,
>>>
>>> Work around a bug in darwin's awk:
>>
>>> (func_get_translations): The first awk script mangles the last
>>> entry passed to it for at least the awk implementation shipped
>>> with Darwin 8.10.1. Capture $3 into a variable too to work-
>>> around that problem.
>>
>> Could you be bothered to explain what this bug does? I don't quite
>> understand from the patch nor the description. Should it be listed
>> in the Autoconf shell portability section?
I don't see this problem mentioned in autoconf.texi, so it looks like we
have some editing to do...
>
> Sure.
>
> $ cat in
> cs:1.4o:../PO-files
> da:1.4o:../PO-files
> de:1.4o:../PO-files
> el:1.4n:../PO-files
> el:1.4o:../PO-files
> fr:1.4o:../PO-files
>
>
> # Before the patch (note the last line of output):
>
> $ cat in | /opt/local/bin/gawk -F: '
>> { if (lang && $1 != lang) print lang, ver, $3 }
>> { lang = $1; ver = $2 }
>> END { if (lang) print lang, ver, $3 }'
> cs 1.4o ../PO-files
> da 1.4o ../PO-files
> de 1.4o ../PO-files
> el 1.4o ../PO-files
> fr 1.4o ../PO-files
> $ cat in | /usr/bin/awk -F: '
>> { if (lang && $1 != lang) print lang, ver, $3 }
>> { lang = $1; ver = $2 }
>> END { if (lang) print lang, ver, $3 }'
> cs 1.4o ../PO-files
> da 1.4o ../PO-files
> de 1.4o ../PO-files
> el 1.4o ../PO-files
> fr 1.4o
>
>
> # After the patch:
>
> $ cat in | /opt/local/bin/gawk -F: '
>> { if (lang && $1 != lang) print lang, ver, subdir }
>> { lang = $1; ver = $2; subdir = $3 }
>> END { if (lang) print lang, ver, subdir }'
> cs 1.4o ../PO-files
> da 1.4o ../PO-files
> de 1.4o ../PO-files
> el 1.4o ../PO-files
> fr 1.4o ../PO-files
> $ cat in | /usr/bin/awk -F: '
>> { if (lang && $1 != lang) print lang, ver, subdir }
>> { lang = $1; ver = $2; subdir = $3 }
>> END { if (lang) print lang, ver, subdir }'
> cs 1.4o ../PO-files
> da 1.4o ../PO-files
> de 1.4o ../PO-files
> el 1.4o ../PO-files
> fr 1.4o ../PO-files
>
> It appears that only gawk saves $3 from the last input line for use in
> the END clause, where darwin awk (maybe others too, I haven't looked
> elsewhere) discards it.
>
> Cheers,
> Gary
>
>
- --
Don't work too hard, make some time for fun as well!
Eric Blake ebb9@xxxxxxx
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