2 logb() function: get exponent.
12 isfinite [test $HAVE_LOGB = 0 || test $REPLACE_LOGB = 1]
13 frexp [test $HAVE_LOGB = 0 || test $REPLACE_LOGB = 1]
14 isnand [test $HAVE_LOGB = 0 || test $REPLACE_LOGB = 1]
18 if test $HAVE_LOGB = 0 || test $REPLACE_LOGB = 1; then
21 gl_MATH_MODULE_INDICATOR([logb])