kc3-lang/gnulib/m4/dup.m4

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

  maint: run 'make update-copyright'
  

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• m4/dup.m4

• # dup.m4 serial 7
  dnl Copyright (C) 2011-2023 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_DUP],
  [
    AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
    m4_ifdef([gl_MSVC_INVAL], [
      AC_REQUIRE([gl_MSVC_INVAL])
      if test $HAVE_MSVC_INVALID_PARAMETER_HANDLER = 1; then
        REPLACE_DUP=1
      fi
    ])
    dnl Replace dup() for supporting the gnulib-defined fchdir() function,
    dnl to keep fchdir's bookkeeping up-to-date.
    m4_ifdef([gl_FUNC_FCHDIR], [
      gl_TEST_FCHDIR
      if test $HAVE_FCHDIR = 0; then
        REPLACE_DUP=1
      fi
    ])
    AC_CACHE_CHECK([whether dup works], [gl_cv_func_dup_works],
      [AC_RUN_IFELSE(
        [AC_LANG_PROGRAM([[#include <unistd.h>
                           #include <fcntl.h>
                           #include <errno.h>
                         ]GL_MDA_DEFINES],
           [[/* On OS/2 kLIBC, dup does not work on a directory fd.  */
             int fd = open (".", O_RDONLY);
             return fd < 0 ? 1 : dup (fd) < 0 ? 2 : 0;
           ]])
        ],
        [gl_cv_func_dup_works=yes],
        [gl_cv_func_dup_works=no],
        [case "$host_os" in
                   # Guess no on native Windows.
           mingw*) gl_cv_func_dup_works="guessing no" ;;
           *)      gl_cv_func_dup_works="guessing yes" ;;
         esac
        ])
      ])
    case "$gl_cv_func_dup_works" in
      *yes) ;;
      *)
        REPLACE_DUP=1
        ;;
    esac
  ])
  
  # Prerequisites of lib/dup.c.
  AC_DEFUN([gl_PREREQ_DUP], [:])
  

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