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From: | Paul Eggert |
Subject: | bug#20290: 25.0.50; Use unified diff format by default, and recommend using it in reports and patches |
Date: | Sun, 12 Apr 2015 16:30:01 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
These days -u format is far more popular than -c format in practice, and I expect that most active Emacs developers prefer -u, so it's appropriate for Emacs to default to -u and for trouble.texi to suggest it.
I suppose that in theory there is the issue of Emacs running on an older POSIXish platform where 'diff' does not support -u. I don't have access to any such platform, though. I can confirm that Solaris 10 diff (2005) supports '-u'. So perhaps we don't need to worry about this.
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