kc3-lang/gnulib/m4/c-strtod.m4

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• Hash : da1c4df8
  Author :
  Date : 2018-05-13T16:03:03
  

  c-strtod: Fix configure test for Android.
  
  * m4/c-strtod.m4 (gl_C_STRTOD): Use AC_LINK_IFELSE instead of
  AC_CHECK_FUNC.
  

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• m4/c-strtod.m4

• # c-strtod.m4 serial 16
  
  # Copyright (C) 2004-2006, 2009-2018 Free Software Foundation, Inc.
  # This file is free software; the Free Software Foundation
  # gives unlimited permission to copy and/or distribute it,
  # with or without modifications, as long as this notice is preserved.
  
  # Written by Paul Eggert.
  
  AC_DEFUN([gl_C99_STRTOLD],
  [
    AC_CACHE_CHECK([whether strtold conforms to C99],
      [gl_cv_func_c99_strtold],
      [AC_LINK_IFELSE(
         [AC_LANG_PROGRAM(
            [[/* On HP-UX before 11.23, strtold returns a struct instead of
                  long double.  Reject implementations like that, by requiring
                  compatibility with the C99 prototype.  */
               #include <stdlib.h>
               static long double (*p) (char const *, char **) = strtold;
               static long double
               test (char const *nptr, char **endptr)
               {
                 long double r;
                 r = strtold (nptr, endptr);
                 return r;
               }]],
             [[return test ("1.0", NULL) != 1 || p ("1.0", NULL) != 1;]])],
         [gl_cv_func_c99_strtold=yes],
         [gl_cv_func_c99_strtold=no])])
    if test $gl_cv_func_c99_strtold = yes; then
      AC_DEFINE([HAVE_C99_STRTOLD], [1], [Define to 1 if strtold conforms to C99.])
    fi
  ])
  
  dnl Prerequisites of lib/c-strtod.c.
  AC_DEFUN([gl_C_STRTOD],
  [
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  
    AC_CHECK_HEADERS_ONCE([xlocale.h])
    dnl We can't use AC_CHECK_FUNC here, because strtod_l() is defined as a
    dnl static inline function when compiling for Android 7.1 or older.
    AC_CACHE_CHECK([for strtod_l], [gl_cv_func_strtod_l],
      [AC_LINK_IFELSE(
         [AC_LANG_PROGRAM(
            [[#include <stdlib.h>
              #include <locale.h>
              #if HAVE_XLOCALE_H
              # include <xlocale.h>
              #endif
              locale_t loc;
            ]],
            [[char *end;
              return strtod_l("0",&end,loc) < 0.0;
            ]])
         ],
         [gl_cv_func_strtod_l=yes],
         [gl_cv_func_strtod_l=no])
      ])
    if test $gl_cv_func_strtod_l = yes; then
      HAVE_STRTOD_L=1
    else
      HAVE_STRTOD_L=0
    fi
    AC_DEFINE_UNQUOTED([HAVE_STRTOD_L], [$HAVE_STRTOD_L],
      [Define to 1 if the system has the 'strtod_l' function.])
  ])
  
  dnl Prerequisites of lib/c-strtold.c.
  AC_DEFUN([gl_C_STRTOLD],
  [
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
    AC_REQUIRE([gl_C99_STRTOLD])
    AC_CHECK_FUNCS([strtold_l])
  ])
  

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