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Re: AT_LINE
From: |
Eric Blake |
Subject: |
Re: AT_LINE |
Date: |
Mon, 14 Sep 2009 05:58:57 -0600 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.23) Gecko/20090812 Thunderbird/2.0.0.23 Mnenhy/0.7.6.666 |
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According to Ralf Wildenhues on 9/13/2009 9:48 AM:
> all debug output will list line N as the originator for the checks.
>
> Is it possible to realize in M4 in Autotest to list another or yet
> another line as line numbers?
Unfortunately, current m4 treats all text created by a macro expansion as
coming from line N where the macro name occurred; there is no way to ask
for a count of lines relative to the expansion. Therefore, the only way I
know of to specify line numbers is to provide them as arguments to the
macro call. That is, instead of:
foo([ # line n
bar # reports line n
bar # reports line n
])
you would use something like:
foo([ # line n
bar(]__line__[) # bar called with line n+1
bar(]__line__[) # bar called with line n+2
])
But that gets hairy fast, and AT_CHECK doesn't have an interface that
currently allows the specification of an alternate line number.
Maybe it would be nice to patch m4 to track __line__ usage within an
expanded macro relative to the number of newlines encountered during the
expansion, but that would be quite a bit of upstream effort, and won't
appear in a stable released version of m4 for quite some time.
This also reminds me that I have plans to implement __line__(value) for m4
1.6, which allows one to change the current reported line on the fly; but
I haven't gotten to that yet.
- --
Don't work too hard, make some time for fun as well!
Eric Blake address@hidden
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- AT_LINE, Ralf Wildenhues, 2009/09/13
- Re: AT_LINE,
Eric Blake <=