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# atanf.m4 serial 3
dnl Copyright (C) 2011-2018 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_ATANF],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_ATAN])
dnl Persuade glibc <math.h> to declare atanf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether atanf() exists. Assume that atanf(), if it exists, is
dnl defined in the same library as atan().
save_LIBS="$LIBS"
LIBS="$LIBS $ATAN_LIBM"
AC_CHECK_FUNCS([atanf])
LIBS="$save_LIBS"
if test $ac_cv_func_atanf = yes; then
ATANF_LIBM="$ATAN_LIBM"
else
HAVE_ATANF=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_atanf, not atanf.
AC_CHECK_DECLS([atanf], [REPLACE_ATANF=1], , [[#include <math.h>]])
ATANF_LIBM="$ATAN_LIBM"
fi
AC_SUBST([ATANF_LIBM])
])
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