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annotate m4/tanl.m4 @ 12762:410eaa89fb57

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Avoid a link error due to the __printf__ symbol.
author Bruno Haible <bruno@clisp.org>
date Tue, 19 Jan 2010 03:15:05 +0100
parents 73d9dd27dc41
children 2614b91f7908
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12752
73d9dd27dc41 New modules acosl, asinl, atanl, cosl, expl, logl, sinl, sqrtl, tanl.
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1 # tanl.m4 serial 1
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2 dnl Copyright (C) 2010 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_TANL],
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8 [
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9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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10 dnl Persuade glibc <math.h> to declare tanl().
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11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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12
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13 TANL_LIBM=
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14 AC_CACHE_CHECK([whether tanl() can be used without linking with libm],
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15 [gl_cv_func_tanl_no_libm],
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16 [
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17 AC_TRY_LINK([#ifndef __NO_MATH_INLINES
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18 # define __NO_MATH_INLINES 1 /* for glibc */
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19 #endif
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20 #include <math.h>
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21 long double x;],
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22 [return tanl (x) > 0.4;],
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23 [gl_cv_func_tanl_no_libm=yes],
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24 [gl_cv_func_tanl_no_libm=no])
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25 ])
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26 if test $gl_cv_func_tanl_no_libm = no; then
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27 AC_CACHE_CHECK([whether tanl() can be used with libm],
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28 [gl_cv_func_tanl_in_libm],
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29 [
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30 save_LIBS="$LIBS"
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31 LIBS="$LIBS -lm"
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32 AC_TRY_LINK([#ifndef __NO_MATH_INLINES
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33 # define __NO_MATH_INLINES 1 /* for glibc */
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34 #endif
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35 #include <math.h>
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36 long double x;],
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37 [return tanl (x) > 0.4;],
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38 [gl_cv_func_tanl_in_libm=yes],
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39 [gl_cv_func_tanl_in_libm=no])
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40 LIBS="$save_LIBS"
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41 ])
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42 if test $gl_cv_func_tanl_in_libm = yes; then
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43 TANL_LIBM=-lm
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44 fi
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45 fi
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46 if test $gl_cv_func_tanl_no_libm = yes \
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47 || test $gl_cv_func_tanl_in_libm = yes; then
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48 dnl Also check whether it's declared.
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49 dnl MacOS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
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50 AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [#include <math.h>])
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51 else
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52 HAVE_DECL_TANL=0
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53 HAVE_TANL=0
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54 AC_LIBOBJ([tanl])
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55 AC_LIBOBJ([trigl])
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56 AC_REQUIRE([gl_FUNC_ISNANL])
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57 AC_REQUIRE([gl_FUNC_FLOOR])
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58 AC_REQUIRE([gl_FUNC_FLOORL])
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59 TANL_LIBM="$ISNANL_LIBM $FLOOR_LIBM $FLOORL_LIBM"
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60 fi
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61 AC_SUBST([TANL_LIBM])
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62 ])