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configure.ac: Forbid AX_-prefixed patterns more selectively

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Merged Simon McVittie requested to merge smcv/dbus:ax-missing into master Jan 21, 2019
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We want to make autoconf fail early and with a user-comprehensible message if autoconf-archive isn't installed, rather than generating a configure script with syntax errors, or a configure script that runs successfully but doesn't do what we intended.

However, autoconf-archive doesn't actually guarantee not to use AX_-prefixed shell variable names without m4_pattern_allow'ing them (unlike Autoconf, Automake, Libtool and pkg-config, which explicitly use m4_pattern_allow for variables with AC_, AM_, LT_ and PKG_ prefixes), so it isn't safe to assume that they won't be used. In particular, recent versions of AX_CHECK_GNU_MAKE appear to be using $AX_CHECK_GNU_MAKE_HEADLINE as a shell variable.

Instead, specifically forbid the names of the finite list of macros that we actually use.

Signed-off-by: Simon McVittie smcv@collabora.com Resolves: #249 (closed)

Edited Jan 21, 2019 by Simon McVittie
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Source branch: ax-missing