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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
# Check whether C23 auto is supported by the current compiler and compilation
# flags. If not, but the GNU __auto_type extension is supported, define auto to
# __auto_type. Otherwise, fail.
AC_DEFUN([MY_C_AUTO],
[AC_CACHE_CHECK([for auto], [my_cv_c_auto],
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([[auto x = 1;]])],
[my_cv_c_auto=yes], [my_cv_c_auto=no])])
if test "x$my_cv_c_auto" != xyes; then
AC_CACHE_CHECK([for __auto_type], [my_cv_c___auto_type],
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([[__auto_type x = 1;]])],
[my_cv_c___auto_type=yes], [my_cv_c___auto_type=no])])
if test "x$my_cv_c___auto_type" = xyes; then
AC_DEFINE([auto], [__auto_type])
else
AC_MSG_ERROR([no auto or __auto_type])
fi
fi
])
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