2 dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_SQRTL],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 dnl Persuade glibc <math.h> to declare sqrtl().
11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14 AC_CACHE_CHECK([whether sqrtl() can be used without linking with libm],
15 [gl_cv_func_sqrtl_no_libm],
19 [[#ifndef __NO_MATH_INLINES
20 # define __NO_MATH_INLINES 1 /* for glibc */
24 [[return sqrtl (x) > 0.4;]])],
25 [gl_cv_func_sqrtl_no_libm=yes],
26 [gl_cv_func_sqrtl_no_libm=no])
28 if test $gl_cv_func_sqrtl_no_libm = no; then
29 AC_CACHE_CHECK([whether sqrtl() can be used with libm],
30 [gl_cv_func_sqrtl_in_libm],
36 [[#ifndef __NO_MATH_INLINES
37 # define __NO_MATH_INLINES 1 /* for glibc */
41 [[return sqrtl (x) > 0.4;]])],
42 [gl_cv_func_sqrtl_in_libm=yes],
43 [gl_cv_func_sqrtl_in_libm=no])
46 if test $gl_cv_func_sqrtl_in_libm = yes; then
50 if test $gl_cv_func_sqrtl_no_libm = yes \
51 || test $gl_cv_func_sqrtl_in_libm = yes; then
52 dnl Also check whether it's declared.
53 dnl MacOS X 10.3 has sqrtl() in libc but doesn't declare it in <math.h>.
54 AC_CHECK_DECL([sqrtl], , [HAVE_DECL_SQRTL=0], [#include <math.h>])
58 dnl Find libraries needed to link lib/sqrtl.c.
59 AC_REQUIRE([gl_FUNC_ISNANL])
60 AC_REQUIRE([gl_FUNC_FREXPL])
61 AC_REQUIRE([gl_FUNC_LDEXPL])
62 AC_REQUIRE([gl_FUNC_SQRT])
63 dnl Append $ISNANL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
64 case " $SQRTL_LIBM " in
65 *" $ISNANL_LIBM "*) ;;
66 *) SQRTL_LIBM="$SQRTL_LIBM $ISNANL_LIBM" ;;
68 dnl Append $FREXPL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
69 case " $SQRTL_LIBM " in
70 *" $FREXPL_LIBM "*) ;;
71 *) SQRTL_LIBM="$SQRTL_LIBM $FREXPL_LIBM" ;;
73 dnl Append $LDEXPL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
74 case " $SQRTL_LIBM " in
75 *" $LDEXPL_LIBM "*) ;;
76 *) SQRTL_LIBM="$SQRTL_LIBM $LDEXPL_LIBM" ;;
78 dnl Append $SQRT_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
79 case " $SQRTL_LIBM " in
81 *) SQRTL_LIBM="$SQRTL_LIBM $SQRT_LIBM" ;;
84 AC_SUBST([SQRTL_LIBM])