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Modernize AC_TRY_LINK invocations.
author Bruno Haible <bruno@clisp.org>
date Mon, 19 Jul 2010 23:30:26 +0200
parents 2614b91f7908
children 97fc9a21a8fb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # acosl.m4 serial 3
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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_ACOSL],
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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 acosl().
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11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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12
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13 ACOSL_LIBM=
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14 AC_CACHE_CHECK([whether acosl() can be used without linking with libm],
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15 [gl_cv_func_acosl_no_libm],
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16 [
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17 AC_LINK_IFELSE(
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18 [AC_LANG_PROGRAM(
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19 [[#ifndef __NO_MATH_INLINES
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20 # define __NO_MATH_INLINES 1 /* for glibc */
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21 #endif
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22 #include <math.h>
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23 long double x;]],
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24 [[return acosl (x) > 1;]])],
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25 [gl_cv_func_acosl_no_libm=yes],
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26 [gl_cv_func_acosl_no_libm=no])
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27 ])
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28 if test $gl_cv_func_acosl_no_libm = no; then
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29 AC_CACHE_CHECK([whether acosl() can be used with libm],
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30 [gl_cv_func_acosl_in_libm],
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31 [
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32 save_LIBS="$LIBS"
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33 LIBS="$LIBS -lm"
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34 AC_LINK_IFELSE(
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35 [AC_LANG_PROGRAM(
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36 [[#ifndef __NO_MATH_INLINES
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37 # define __NO_MATH_INLINES 1 /* for glibc */
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38 #endif
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39 #include <math.h>
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40 long double x;]],
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41 [[return acosl (x) > 1;]])],
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42 [gl_cv_func_acosl_in_libm=yes],
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43 [gl_cv_func_acosl_in_libm=no])
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44 LIBS="$save_LIBS"
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45 ])
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46 if test $gl_cv_func_acosl_in_libm = yes; then
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47 ACOSL_LIBM=-lm
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48 fi
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49 fi
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50 if test $gl_cv_func_acosl_no_libm = yes \
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51 || test $gl_cv_func_acosl_in_libm = yes; then
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52 dnl Also check whether it's declared.
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53 dnl MacOS X 10.3 has acosl() in libc but doesn't declare it in <math.h>.
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54 AC_CHECK_DECL([acosl], , [HAVE_DECL_ACOSL=0], [#include <math.h>])
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55 else
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56 HAVE_DECL_ACOSL=0
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57 HAVE_ACOSL=0
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58 AC_LIBOBJ([acosl])
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59 AC_REQUIRE([gl_FUNC_ASINL])
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60 AC_REQUIRE([gl_FUNC_SQRTL])
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61 dnl Append $ASINL_LIBM to ACOSL_LIBM, avoiding gratuitous duplicates.
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62 case " $ACOSL_LIBM " in
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63 *" $ASINL_LIBM "*) ;;
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64 *) ACOSL_LIBM="$ACOSL_LIBM $ASINL_LIBM" ;;
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65 esac
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66 dnl Append $SQRTL_LIBM to ACOSL_LIBM, avoiding gratuitous duplicates.
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67 case " $ACOSL_LIBM " in
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68 *" $SQRTL_LIBM "*) ;;
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69 *) ACOSL_LIBM="$ACOSL_LIBM $SQRTL_LIBM" ;;
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70 esac
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71 fi
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72 AC_SUBST([ACOSL_LIBM])
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73 ])