kc3-lang/gnulib/m4/eoverflow.m4

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• Hash : 52aceb00
  Author :
  Date : 2005-01-18T13:07:56
  

  Use an all-permissive copyright notice, recommended by RMS.
  

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• m4/eoverflow.m4

• # eoverflow.m4 serial 1
  dnl Copyright (C) 2004 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.
  
  dnl From Bruno Haible.
  
  # The EOVERFLOW errno value ought to be defined in <errno.h>, according to
  # POSIX.  But some systems (like AIX 3) don't define it, and some systems
  # (like OSF/1) define it when _XOPEN_SOURCE_EXTENDED is defined.
  
  # Define EOVERFLOW as a C macro and as a substituted macro in such a way that
  # 1. on all systems, after inclusion of <errno.h>, EOVERFLOW is usable,
  # 2. on systems where EOVERFLOW is defined elsewhere, we use the same numeric
  #    value.
  
  AC_DEFUN([gl_EOVERFLOW],
  [
    AC_REQUIRE([AC_PROG_CC])dnl
  
    AC_CACHE_CHECK([for EOVERFLOW], ac_cv_decl_EOVERFLOW, [
      AC_EGREP_CPP(yes,[
  #include <errno.h>
  #ifdef EOVERFLOW
  yes
  #endif
        ], have_eoverflow=1)
      if test -n "$have_eoverflow"; then
        dnl EOVERFLOW exists in <errno.h>. Don't need to define EOVERFLOW ourselves.
        ac_cv_decl_EOVERFLOW=yes
      else
        AC_EGREP_CPP(yes,[
  #define _XOPEN_SOURCE_EXTENDED 1
  #include <errno.h>
  #ifdef EOVERFLOW
  yes
  #endif
          ], have_eoverflow=1)
        if test -n "$have_eoverflow"; then
          dnl EOVERFLOW exists but is hidden.
          dnl Define it to the same value.
          _AC_COMPUTE_INT([EOVERFLOW], ac_cv_decl_EOVERFLOW, [
  #define _XOPEN_SOURCE_EXTENDED 1
  #include <errno.h>
  /* The following two lines are a workaround against an autoconf-2.52 bug.  */
  #include <stdio.h>
  #include <stdlib.h>
  ])
        else
          dnl EOVERFLOW isn't defined by the system. Define EOVERFLOW ourselves, but
          dnl don't define it as EINVAL, because snprintf() callers want to
          dnl distinguish EINVAL and EOVERFLOW.
          ac_cv_decl_EOVERFLOW=E2BIG
        fi
      fi
    ])
    if test "$ac_cv_decl_EOVERFLOW" != yes; then
      AC_DEFINE_UNQUOTED([EOVERFLOW], [$ac_cv_decl_EOVERFLOW],
                         [Define as good substitute value for EOVERFLOW.])
      EOVERFLOW="$ac_cv_decl_EOVERFLOW"
      AC_SUBST(EOVERFLOW)
    fi
  ])
  

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