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# atan2f.m4 serial 3
dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_ATAN2F],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_ATAN2])
dnl Persuade glibc <math.h> to declare atan2f().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether atan2f() exists. Assume that atan2f(), if it exists, is
dnl defined in the same library as atan2().
save_LIBS="$LIBS"
LIBS="$LIBS $ATAN2_LIBM"
AC_CHECK_FUNCS([atan2f])
LIBS="$save_LIBS"
if test $ac_cv_func_atan2f = yes; then
ATAN2F_LIBM="$ATAN2_LIBM"
else
HAVE_ATAN2F=0
dnl If the function is declared but does not appear to exist, it may be
dnl defined as an inline function. In order to avoid a conflict, we have
dnl to define rpl_atan2f, not atan2f.
AC_CHECK_DECLS([atan2f], [REPLACE_ATAN2F=1], , [[#include <math.h>]])
ATAN2F_LIBM="$ATAN2_LIBM"
fi
AC_SUBST([ATAN2F_LIBM])
])
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