kc3-lang/gnulib/m4/pwrite.m4

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• Hash : dd38adc8
  Author :
  Date : 2023-01-22T01:38:16
  

  Resolve conflicts for functions introduced in Android API level 12.
  
  * m4/pwrite.m4 (gl_FUNC_PWRITE): Conditionally set REPLACE_PWRITE.
  * lib/unistd.in.h (pwrite): Disable _GL_CXXALIASWARN invocation on
  non-glibc systems.
  

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• m4/pwrite.m4

• # pwrite.m4 serial 8
  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_PWRITE],
  [
    AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  
    dnl Persuade glibc <unistd.h> to declare pwrite().
    AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
  
    gl_CHECK_FUNCS_ANDROID([pwrite], [[#include <unistd.h>]])
    if test $ac_cv_func_pwrite = yes; then
      dnl On HP-UX 11.11 with _FILE_OFFSET_BITS=64, pwrite() on a file does not
      dnl fail when an invalid (negative) offset is passed and uses an arbitrary
      dnl offset instead of the argument.
      AC_CACHE_CHECK([whether pwrite works],
        [gl_cv_func_pwrite_works],
        [
          dnl Initial guess, used when cross-compiling.
  changequote(,)dnl
          case "$host_os" in
                   # Guess no on HP-UX.
            hpux*) gl_cv_func_pwrite_works="guessing no" ;;
                   # Guess yes otherwise.
            *)     gl_cv_func_pwrite_works="guessing yes" ;;
          esac
  changequote([,])dnl
          gl_save_CPPFLAGS="$CPPFLAGS"
          CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=64"
          rm -f conftest.out
          AC_RUN_IFELSE(
            [AC_LANG_PROGRAM([[
  #include <sys/types.h>
  #include <unistd.h>
  #include <fcntl.h>
               ]GL_MDA_DEFINES],
               [[
  {
    /* This test fails on HP-UX 11.00..11.11.  */
    {
      int fd = open ("conftest.out", O_RDWR | O_CREAT | O_TRUNC, 0600);
      if (fd < 0)
        return 1;
      if (pwrite (fd, "b", 1, (off_t) -1) >= 0)
        return 2;
    }
    /* This test fails on HP-UX 11.00..11.11.  */
    {
      int fd;
      char buf[] = "01";
  
      fd = open ("conftest.out", O_WRONLY | O_CREAT | O_TRUNC, 0600);
      if (fd < 0)
        return 3;
      if (write (fd, buf, 2) < 2)
        return 4;
      if (close (fd) < 0)
        return 5;
  
      fd = open ("conftest.out", O_WRONLY, 0600);
      if (fd < 0)
        return 6;
      if (pwrite (fd, "W", 1, (off_t) 0) != 1)
        return 7;
      if (close (fd) < 0)
        return 8;
  
      fd = open ("conftest.out", O_RDONLY);
      if (fd < 0)
        return 9;
      if (read (fd, buf, 2) < 2)
        return 10;
      if (close (fd) < 0)
        return 11;
      if (buf[0] != 'W')
        return 12;
      if (buf[1] != '1')
        return 13;
    }
    return 0;
  }]])],
            [gl_cv_func_pwrite_works=yes],
            [gl_cv_func_pwrite_works=no],
            [:])
          rm -f conftest.out
          CPPFLAGS="$gl_save_CPPFLAGS"
        ])
      case "$gl_cv_func_pwrite_works" in
        *yes) ;;
        *) REPLACE_PWRITE=1 ;;
      esac
    else
      HAVE_PWRITE=0
      case "$gl_cv_onwards_func_pwrite" in
        future*) REPLACE_PWRITE=1 ;;
      esac
    fi
  ])
  

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