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This is to announce autoconf-2.72.90, a beta release for the
forthcoming autoconf 2.73. This is largely a bug-fix release;
the most important change is improved support for the 2024 revision
of the C standard (commonly known as "C23") and for compilers that
default to that revision. See the NEWS excerpt below for details,
and for a brief summary of other important changes since autoconf 2.72.
Please test this beta widely, especially with the combination of new
compilers (defaulting to C23) and old programs that *should have*
been updated for the non-backward-compatible changes in C23.
We plan to make the final release of autoconf 2.73 toward the end of
February 2026.
There have been 124 commits by 17 people in the 110 weeks since 2.72.
Thanks to everyone who has contributed!
The following people contributed changes to this release:
Alyssa Ross (1)
Basil L. Contovounesios (1)
Bruno Haible (8)
Christian Feld (1)
Jack Kelly (1)
Jan André Reuter (1)
Jim Meyering (1)
Jose E. Marchesi (1)
KO Myung-Hun (1)
Luke Mewburn (1)
Markus Mützel (1)
Paul Eggert (77)
R. Diez (1)
Sevan Janiyan (1)
Vincent Lefevre (1)
Yann E. MORIN (1)
Zack Weinberg (25)
zw
[on behalf of the autoconf maintainers]
==================================================================
Here is the GNU autoconf home page:
https://gnu.org/s/autoconf/
Here are the compressed sources:
https://alpha.gnu.org/gnu/autoconf/autoconf-2.72.90.tar.gz (2.1MB)
https://alpha.gnu.org/gnu/autoconf/autoconf-2.72.90.tar.xz (1.4MB)
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Use a mirror for higher download bandwidth:
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File: autoconf-2.72.90.tar.gz
SHA256 sum: 36f11c36944deef7c03919717f5f7dfe4a4f5c2857827736d77ecc07187fe835
SHA3-256 sum: 582ce76b7915a56bee1042187ca44bf78059911d31451f8f5e2e7d6e9ec411a4
File: autoconf-2.72.90.tar.xz
SHA256 sum: ecd8675dc049db9560825cd0ef2b950c58b8cf743451e41c2b8429aa5e9eb1cb
SHA3-256 sum: 3defc2ec6eb0fbfd262a43333ade8ef50dd2f5a2ff33a18bb478e4f88881c991
Verify the SHA256 checksum with either sha256sum, sha256, or
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Use a .sig file to verify that the corresponding file (without the
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gpg --verify autoconf-2.72.90.tar.gz.sig
The signature should match the fingerprint of the following key:
pub rsa4096 2010-01-14 [SC]
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uid Zack Weinberg <[email protected]>
If that command fails because you don't have the required public key,
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gpg --locate-external-key [email protected]
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wget -q https://ftp.gnu.org/gnu/gnu-keyring.gpg
gpg --keyring gnu-keyring.gpg --verify autoconf-2.72.90.tar.gz.sig
This release is based on the autoconf git repository, available as
git clone https://https.git.savannah.gnu.org/git/autoconf.git
with commit 11dbdfde4015d92e47d90de9e16ea25e677a1b01 tagged as v2.72.90.
For a summary of changes and contributors, see:
https://gitweb.git.savannah.gnu.org/gitweb/?p=autoconf.git;a=shortlog;h=v2.72.90
or run this command from a git-cloned autoconf directory:
git shortlog v2.72..v2.72.90
This release was bootstrapped with the following tools:
Automake 1.18.1
NEWS
* Noteworthy changes in release 2.72.90 (2026-02-03) [beta]
** Backward incompatibilities
*** AC_PROG_CC now prefers C23 if available.
Older code may need to be updated, as C23 has removed old-style
(K&R) function definitions and declarations, now uses type-generic
functions for strchr and similar functions, and has new keywords
alignas, alignof, bool, constexpr, false, nullptr, static_assert,
thread_local, true, typeof, typeof_unqual.
*** AC_PROG_CC no longer checks __STDC__ or variable length arrays (VLAs).
This ports better to MSVC, which does not define __STDC__ and does
not support VLAs. Although C99 requires VLAs, they are optional in
C11 and later. Programs can use AC_C_VARARRAYS and __STDC_NO_VLA__
to use VLAs if available.
*** AC_PROG_CXX no longer attempts to switch to C++98 or C++11.
Instead, it uses the compiler's default, which you can override
by configuring with something like CXX='g++ -std=gnu++11'.
This reverts to Autoconf 2.69 behavior, and also fixes a bug where
AC_PROG_CXX rejected C++20 compilers.
** New features
*** Programs now recognize #elifdef and #elifndef.
The autom4te, autoscan and ifnames programs now recognize the two
preprocessor directives, which were introduced in C23 and C++23.
*** Support for the Algol 68 programming language has been added.
The new macro AC_LANG_A68 sets variables A68 and A68FLAGS.
*** AC_PROG_AWK now also checks for busybox awk.
*** AC_USE_SYSTEM_EXTENSIONS now defines _COSMO_SOURCE for Cosmopolitan Libc.
** Notable bug fixes
*** AC_CHECK_DECL and AC_CHECK_DECLS will, on macOS, now report "no" for
functions that are declared as existing in future macOS versions only.
*** AC_DEFINE_UNQUOTED no longer mishandles double-quotes inside $(...)
and ${...}.
*** AC_DEFINE and similar macros no longer emit trailing whitespace.
This pacifies the -Wtrailing-whitespace introduced in GCC 15.
*** AC_FUNC_STRNLEN now detects Android 5.0's broken strnlen.
*** AC_PROG_OBJC now finds the GNU Objective-C compiler, as packaged in
EPEL 9, by default, without the user having to set the OBJC variable.
*** Autoconf no longer generates ${1+"$@"} in scripts, working around
a bug in AIX 7.2 ksh93.
*** config.status now fails with a diagnostic if awk is missing,
rather than misbehaving.
*** autoreconf handles projects using GNU Gettext and/or gtk-doc better.
A variety of situations where autoreconf would try to run the
'autopoint' and/or 'gtkdocize' tools when it shouldn't have,
or *wouldn't* run them when it *should* have, have been corrected.
See <https://savannah.gnu.org/support/index.php?111273>,
<https://savannah.gnu.org/support/index.php?111272>,
<https://savannah.gnu.org/support/index.php?111271>,
<https://savannah.gnu.org/support/index.php?110503>.
*** autoconf no longer installs a file named "version.m4".
This eliminates an annoying (but harmless) warning produced by
Autoconf 2.72 when projects contain their own "version.m4".
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