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characters allowed in --enable-*/--with-*

From: Ralf Wildenhues
Subject: characters allowed in --enable-*/--with-*
Date: Sun, 1 Aug 2010 09:14:21 +0200
User-agent: Mutt/1.5.20 (2010-04-22)

Hello bug-standards readers,

Autoconf 2.66 added '+' to the set of allowed characters in --enable-*
and --with-* switches (mapping them to underscores for the variable name
that they influence).  Using these can cause problems in trees with
older configures, or ones not made by Autoconf that are not prepared for
plus signs.

So, my question is: could standards.texi document the set of allowed

Current Autoconf has -+. mapped to _ and otherwise wants characters
eligible for shell variable names; but you may want to just allow more
of them?


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