• Simon McVittie's avatar
    configure.ac: Forbid AX_-prefixed patterns more selectively · 6ef67cff
    Simon McVittie authored
    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's avatarSimon McVittie <smcv@collabora.com>
    Resolves: #249
    (cherry picked from commit ee09cc0a)
configure.ac 61.9 KB