[php-src] Issue #9483: buildconf warning with autoconf 2.71

Issue: https://github.com/php/php-src/issues/9483 Author: nikic ### Description Running ./buildconf with autoconf 2.71 (Ubuntu 22.04) results in a slew of warnings: ``` buildconf: Checking installation buildconf: autoconf version 2.71 (ok) buildconf: Cleaning cache and configure files buildconf: Rebuilding configure configure.ac:131: warning: The macro `AC_PROG_CC_C99' is obsolete. configure.ac:131: You should run autoupdate. ./lib/autoconf/c.m4:1659: AC_PROG_CC_C99 is expanded from... configure.ac:131: the top level configure.ac:1565: warning: The macro `AC_LANG_C' is obsolete. configure.ac:1565: You should run autoupdate. ./lib/autoconf/c.m4:72: AC_LANG_C is expanded from... build/libtool.m4:2739: _LT_AC_LANG_C_CONFIG is expanded from... build/libtool.m4:2738: AC_LIBTOOL_LANG_C_CONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: The macro `AC_LANG_C' is obsolete. configure.ac:1565: You should run autoupdate. ./lib/autoconf/c.m4:72: AC_LANG_C is expanded from... lib/m4sugar/m4sh.m4:692: _AS_IF_ELSE is expanded from... lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:2249: AC_CACHE_VAL is expanded from... ./lib/autoconf/general.m4:2270: AC_CACHE_CHECK is expanded from... build/libtool.m4:561: _LT_AC_LOCK is expanded from... build/libtool.m4:1185: AC_LIBTOOL_SYS_HARD_LINK_LOCKS is expanded from... build/libtool.m4:2739: _LT_AC_LANG_C_CONFIG is expanded from... build/libtool.m4:2738: AC_LIBTOOL_LANG_C_CONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: The macro `AC_TRY_LINK' is obsolete. configure.ac:1565: You should run autoupdate. ./lib/autoconf/general.m4:2920: AC_TRY_LINK is expanded from... lib/m4sugar/m4sh.m4:692: _AS_IF_ELSE is expanded from... lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:2249: AC_CACHE_VAL is expanded from... ./lib/autoconf/general.m4:2270: AC_CACHE_CHECK is expanded from... build/libtool.m4:561: _LT_AC_LOCK is expanded from... build/libtool.m4:1185: AC_LIBTOOL_SYS_HARD_LINK_LOCKS is expanded from... build/libtool.m4:2739: _LT_AC_LANG_C_CONFIG is expanded from... build/libtool.m4:2738: AC_LIBTOOL_LANG_C_CONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me:${as_lineno-$LINENO}: WARNING: \$CC' does not support \-c -o', so \`make -j' may be unsafe build/libtool.m4:1185: AC_LIBTOOL_SYS_HARD_LINK_LOCKS is expanded from... build/libtool.m4:2739: _LT_AC_LANG_C_CONFIG is expanded from... build/libtool.m4:2738: AC_LIBTOOL_LANG_C_CONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me: WARNING: \$CC' does not support \-c -o', so \`make -j' may be unsafe build/libtool.m4:1185: AC_LIBTOOL_SYS_HARD_LINK_LOCKS is expanded from... build/libtool.m4:2739: _LT_AC_LANG_C_CONFIG is expanded from... build/libtool.m4:2738: AC_LIBTOOL_LANG_C_CONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me:${as_lineno-$LINENO}: WARNING: output file \`$ofile' does not exist build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me: WARNING: output file \`$ofile' does not exist build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me:${as_lineno-$LINENO}: WARNING: output file \`$ofile' does not look like a libtool script build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me: WARNING: output file \`$ofile' does not look like a libtool script build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me:${as_lineno-$LINENO}: WARNING: using \LTCC=$LTCC', extracted from \$ofile' build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me: WARNING: using \LTCC=$LTCC', extracted from \$ofile' build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: tag name \"$tagname\" already exists build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: The macro `AC_LANG_CPLUSPLUS' is obsolete. configure.ac:1565: You should run autoupdate. ./lib/autoconf/c.m4:262: AC_LANG_CPLUSPLUS is expanded from... build/libtool.m4:2821: _LT_AC_LANG_CXX_CONFIG is expanded from... build/libtool.m4:2820: AC_LIBTOOL_LANG_CXX_CONFIG is expanded from... build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me:${as_lineno-$LINENO}: WARNING: \$CC' does not support \-c -o', so \`make -j' may be unsafe build/libtool.m4:1185: AC_LIBTOOL_SYS_HARD_LINK_LOCKS is expanded from... build/libtool.m4:2821: _LT_AC_LANG_CXX_CONFIG is expanded from... build/libtool.m4:2820: AC_LIBTOOL_LANG_CXX_CONFIG is expanded from... build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level configure.ac:1565: warning: back quotes and double quotes must not be escaped in: $as_me: WARNING: \$CC' does not support \-c -o', so \`make -j' may be unsafe build/libtool.m4:1185: AC_LIBTOOL_SYS_HARD_LINK_LOCKS is expanded from... build/libtool.m4:2821: _LT_AC_LANG_CXX_CONFIG is expanded from... build/libtool.m4:2820: AC_LIBTOOL_LANG_CXX_CONFIG is expanded from... build/libtool.m4:1929: _LT_AC_TAGCONFIG is expanded from... build/libtool.m4:70: AC_LIBTOOL_SETUP is expanded from... build/libtool.m4:52: _AC_PROG_LIBTOOL is expanded from... build/libtool.m4:39: AC_PROG_LIBTOOL is expanded from... configure.ac:1565: the top level buildconf: Rebuilding main/php_config.h.in buildconf: Run ./configure to proceed with customizing the PHP build. ``` ### PHP Version PHP 8.3 ### Operating System Ubuntu 22.04