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# cbrt.m4 serial 2
dnl Copyright (C) 2012-2023 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_CBRT],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare cbrt().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Determine CBRT_LIBM.
gl_COMMON_DOUBLE_MATHFUNC([cbrt])
dnl Test whether cbrt() exists.
save_LIBS="$LIBS"
LIBS="$LIBS $CBRT_LIBM"
AC_CHECK_FUNCS([cbrt])
LIBS="$save_LIBS"
if test $ac_cv_func_cbrt = no; then
HAVE_CBRT=0
dnl Find libraries needed to link lib/cbrt.c.
AC_REQUIRE([gl_FUNC_FABS])
AC_REQUIRE([gl_FUNC_FREXP])
AC_REQUIRE([gl_FUNC_LDEXP])
CBRT_LIBM=
dnl Append $FABS_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
case " $CBRT_LIBM " in
*" $FABS_LIBM "*) ;;
*) CBRT_LIBM="$CBRT_LIBM $FABS_LIBM" ;;
esac
dnl Append $FREXP_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
case " $CBRT_LIBM " in
*" $FREXP_LIBM "*) ;;
*) CBRT_LIBM="$CBRT_LIBM $FREXP_LIBM" ;;
esac
dnl Append $LDEXP_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
case " $CBRT_LIBM " in
*" $LDEXP_LIBM "*) ;;
*) CBRT_LIBM="$CBRT_LIBM $LDEXP_LIBM" ;;
esac
fi
])
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