Mercurial > hg > octave-shane > gnulib-hg
annotate m4/expm1l.m4 @ 17480:f40b3156a43e
selinux-at: omit unnecessary include
* lib/selinux-at.c: Don't include dosname.h; not needed, since
this source file doesn't use its macros, and subsidiary files that
use the macros already include it.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Fri, 23 Aug 2013 13:53:46 -0700 |
| parents | e542fd46ad6f |
| children | 344018b6e5d7 |
| rev | line source |
|---|---|
|
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1 # expm1l.m4 serial 2 |
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2 dnl Copyright (C) 2010-2013 Free Software Foundation, Inc. |
| 16585 | 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. | |
| 6 | |
| 7 AC_DEFUN([gl_FUNC_EXPM1L], | |
| 8 [ | |
| 9 AC_REQUIRE([gl_MATH_H_DEFAULTS]) | |
| 10 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) | |
| 11 | |
| 12 dnl Persuade glibc <math.h> to declare expm1l(). | |
| 13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
| 14 | |
| 15 EXPM1L_LIBM= | |
| 16 AC_CACHE_CHECK([whether expm1l() can be used without linking with libm], | |
| 17 [gl_cv_func_expm1l_no_libm], | |
| 18 [ | |
| 19 AC_LINK_IFELSE( | |
| 20 [AC_LANG_PROGRAM( | |
| 21 [[#ifndef __NO_MATH_INLINES | |
| 22 # define __NO_MATH_INLINES 1 /* for glibc */ | |
| 23 #endif | |
| 24 #include <math.h> | |
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25 extern |
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26 #ifdef __cplusplus |
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27 "C" |
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28 #endif |
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29 long double expm1l (long double); |
| 16585 | 30 long double (*funcptr) (long double) = expm1l; |
| 31 long double x;]], | |
| 32 [[return funcptr (x) > 0.5 | |
| 33 || expm1l (x) > 0.5;]])], | |
| 34 [gl_cv_func_expm1l_no_libm=yes], | |
| 35 [gl_cv_func_expm1l_no_libm=no]) | |
| 36 ]) | |
| 37 if test $gl_cv_func_expm1l_no_libm = no; then | |
| 38 AC_CACHE_CHECK([whether expm1l() can be used with libm], | |
| 39 [gl_cv_func_expm1l_in_libm], | |
| 40 [ | |
| 41 save_LIBS="$LIBS" | |
| 42 LIBS="$LIBS -lm" | |
| 43 AC_LINK_IFELSE( | |
| 44 [AC_LANG_PROGRAM( | |
| 45 [[#ifndef __NO_MATH_INLINES | |
| 46 # define __NO_MATH_INLINES 1 /* for glibc */ | |
| 47 #endif | |
| 48 #include <math.h> | |
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49 extern |
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50 #ifdef __cplusplus |
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51 "C" |
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52 #endif |
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53 long double expm1l (long double); |
| 16585 | 54 long double (*funcptr) (long double) = expm1l; |
| 55 long double x;]], | |
| 56 [[return funcptr (x) > 0.5 | |
| 57 || expm1l (x) > 0.5;]])], | |
| 58 [gl_cv_func_expm1l_in_libm=yes], | |
| 59 [gl_cv_func_expm1l_in_libm=no]) | |
| 60 LIBS="$save_LIBS" | |
| 61 ]) | |
| 62 if test $gl_cv_func_expm1l_in_libm = yes; then | |
| 63 EXPM1L_LIBM=-lm | |
| 64 fi | |
| 65 fi | |
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66 if test $gl_cv_func_expm1l_no_libm = yes \ |
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67 || test $gl_cv_func_expm1l_in_libm = yes; then |
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68 HAVE_EXPM1L=1 |
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69 dnl Also check whether it's declared. |
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70 dnl IRIX 6.5 has expm1l() in libm but doesn't declare it in <math.h>. |
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71 AC_CHECK_DECL([expm1l], , [HAVE_DECL_EXPM1L=0], [[#include <math.h>]]) |
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72 else |
| 16585 | 73 HAVE_EXPM1L=0 |
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74 HAVE_DECL_EXPM1L=0 |
| 16585 | 75 dnl Find libraries needed to link lib/expm1l.c. |
| 76 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then | |
| 77 AC_REQUIRE([gl_FUNC_EXPM1]) | |
| 78 EXPM1L_LIBM="$EXPM1_LIBM" | |
| 79 else | |
| 80 AC_REQUIRE([gl_FUNC_ISNANL]) | |
| 81 AC_REQUIRE([gl_FUNC_EXPL]) | |
| 82 AC_REQUIRE([gl_FUNC_ROUNDL]) | |
| 83 AC_REQUIRE([gl_FUNC_LDEXPL]) | |
| 84 EXPM1L_LIBM= | |
| 85 dnl Append $ISNANL_LIBM to EXPM1L_LIBM, avoiding gratuitous duplicates. | |
| 86 case " $EXPM1L_LIBM " in | |
| 87 *" $ISNANL_LIBM "*) ;; | |
| 88 *) EXPM1L_LIBM="$EXPM1L_LIBM $ISNANL_LIBM" ;; | |
| 89 esac | |
| 90 dnl Append $EXPL_LIBM to EXPM1L_LIBM, avoiding gratuitous duplicates. | |
| 91 case " $EXPM1L_LIBM " in | |
| 92 *" $EXPL_LIBM "*) ;; | |
| 93 *) EXPM1L_LIBM="$EXPM1L_LIBM $EXPL_LIBM" ;; | |
| 94 esac | |
| 95 dnl Append $ROUNDL_LIBM to EXPM1L_LIBM, avoiding gratuitous duplicates. | |
| 96 case " $EXPM1L_LIBM " in | |
| 97 *" $ROUNDL_LIBM "*) ;; | |
| 98 *) EXPM1L_LIBM="$EXPM1L_LIBM $ROUNDL_LIBM" ;; | |
| 99 esac | |
| 100 dnl Append $LDEXPL_LIBM to EXPM1L_LIBM, avoiding gratuitous duplicates. | |
| 101 case " $EXPM1L_LIBM " in | |
| 102 *" $LDEXPL_LIBM "*) ;; | |
| 103 *) EXPM1L_LIBM="$EXPM1L_LIBM $LDEXPL_LIBM" ;; | |
| 104 esac | |
| 105 fi | |
| 106 fi | |
| 107 AC_SUBST([EXPM1L_LIBM]) | |
| 108 ]) |