kc3-lang/gnulib/m4/cbrt.m4

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

  maint: run 'make update-copyright'
  

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• m4/cbrt.m4

• # cbrt.m4 serial 2
  dnl Copyright (C) 2012-2023 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_CBRT],
  [
    AC_REQUIRE([gl_MATH_H_DEFAULTS])
  
    dnl Persuade glibc <math.h> to declare cbrt().
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  
    dnl Determine CBRT_LIBM.
    gl_COMMON_DOUBLE_MATHFUNC([cbrt])
  
    dnl Test whether cbrt() exists.
    save_LIBS="$LIBS"
    LIBS="$LIBS $CBRT_LIBM"
    AC_CHECK_FUNCS([cbrt])
    LIBS="$save_LIBS"
    if test $ac_cv_func_cbrt = no; then
      HAVE_CBRT=0
      dnl Find libraries needed to link lib/cbrt.c.
      AC_REQUIRE([gl_FUNC_FABS])
      AC_REQUIRE([gl_FUNC_FREXP])
      AC_REQUIRE([gl_FUNC_LDEXP])
      CBRT_LIBM=
      dnl Append $FABS_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
      case " $CBRT_LIBM " in
        *" $FABS_LIBM "*) ;;
        *) CBRT_LIBM="$CBRT_LIBM $FABS_LIBM" ;;
      esac
      dnl Append $FREXP_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
      case " $CBRT_LIBM " in
        *" $FREXP_LIBM "*) ;;
        *) CBRT_LIBM="$CBRT_LIBM $FREXP_LIBM" ;;
      esac
      dnl Append $LDEXP_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
      case " $CBRT_LIBM " in
        *" $LDEXP_LIBM "*) ;;
        *) CBRT_LIBM="$CBRT_LIBM $LDEXP_LIBM" ;;
      esac
    fi
  ])
  

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