kc3-lang/gnulib/m4/tanl.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/tanl.m4

• # tanl.m4 serial 9
  dnl Copyright (C) 2010-2023 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_TANL],
  [
    AC_REQUIRE([gl_MATH_H_DEFAULTS])
    AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
  
    dnl Persuade glibc <math.h> to declare tanl().
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  
    TANL_LIBM=
    AC_CACHE_CHECK([whether tanl() can be used without linking with libm],
      [gl_cv_func_tanl_no_libm],
      [
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#ifndef __NO_MATH_INLINES
               # define __NO_MATH_INLINES 1 /* for glibc */
               #endif
               #include <math.h>
               long double (* volatile funcptr) (long double) = tanl;
               long double x;]],
             [[return funcptr (x) > 0.4
                      || tanl (x) > 0.4;]])],
          [gl_cv_func_tanl_no_libm=yes],
          [gl_cv_func_tanl_no_libm=no])
      ])
    if test $gl_cv_func_tanl_no_libm = no; then
      AC_CACHE_CHECK([whether tanl() can be used with libm],
        [gl_cv_func_tanl_in_libm],
        [
          save_LIBS="$LIBS"
          LIBS="$LIBS -lm"
          AC_LINK_IFELSE(
            [AC_LANG_PROGRAM(
               [[#ifndef __NO_MATH_INLINES
                 # define __NO_MATH_INLINES 1 /* for glibc */
                 #endif
                 #include <math.h>
                 long double (* volatile funcptr) (long double) = tanl;
                 long double x;]],
               [[return funcptr (x) > 0.4
                        || tanl (x) > 0.4;]])],
            [gl_cv_func_tanl_in_libm=yes],
            [gl_cv_func_tanl_in_libm=no])
          LIBS="$save_LIBS"
        ])
      if test $gl_cv_func_tanl_in_libm = yes; then
        TANL_LIBM=-lm
      fi
    fi
    if test $gl_cv_func_tanl_no_libm = yes \
       || test $gl_cv_func_tanl_in_libm = yes; then
      dnl Also check whether it's declared.
      dnl Mac OS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
      AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [[#include <math.h>]])
    else
      HAVE_DECL_TANL=0
      HAVE_TANL=0
      dnl Find libraries needed to link lib/tanl.c, lib/trigl.c.
      if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
        AC_REQUIRE([gl_FUNC_TAN])
        TANL_LIBM="$TAN_LIBM"
      else
        AC_REQUIRE([gl_FUNC_ISNANL])
        AC_REQUIRE([gl_FUNC_FLOOR])
        AC_REQUIRE([gl_FUNC_FLOORL])
        dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
        case " $TANL_LIBM " in
          *" $ISNANL_LIBM "*) ;;
          *) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;;
        esac
        dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
        case " $TANL_LIBM " in
          *" $FLOOR_LIBM "*) ;;
          *) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;;
        esac
        dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
        case " $TANL_LIBM " in
          *" $FLOORL_LIBM "*) ;;
          *) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;;
        esac
      fi
    fi
    AC_SUBST([TANL_LIBM])
  ])
  

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