From: Michael Jeanson Date: Thu, 18 Feb 2021 19:31:34 +0000 (-0500) Subject: Fix: configure: support Autoconf 2.70 X-Git-Url: https://git.lttng.org/?a=commitdiff_plain;h=a6235500993d5963c049e80f534284af196cda30;hp=a6235500993d5963c049e80f534284af196cda30;p=lttng-trace.git Fix: configure: support Autoconf 2.70 The newly-released autoconf 2.70 introduces a number of breaking changes [1] and is being rolled-out by some distros. Amongst those changes, the AC_PROG_CC_STDC macro is marked as obsolete and was merged into AC_PROG_CC, which we already use. On 2.70, this results in a warning which we handle as an error. A version check is added to invoke the AC_PROG_CC_STDC macro only when running a pre-2.70 version of autoconf, fixing the issue. Also, the AX_PTHREAD macro makes use of the $as_echo built-in shell variable which no longer exists in 2.70. A patch was submitted to the GNU Autoconf archive in March, but there have been no signs of life given since then [2]. As such, our local copy is updated to the latest version and the patch (which looks fairly straight-forward / safe) is applied. This should minimize changes once we go back to an "official" version of the macro. [1] https://lwn.net/Articles/839395/ [2] https://savannah.gnu.org/patch/?9906 Signed-off-by: Michael Jeanson Signed-off-by: Mathieu Desnoyers Change-Id: I50c8ac14c0fc6787faf5a47693b93b28c14ecf96 ---