+# atan2f.m4 serial 1
+dnl Copyright (C) 2011 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 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
+ ATAN2F_LIBM="$ATAN2_LIBM"
+ fi
+ AC_SUBST([ATAN2F_LIBM])
+])