File: configure.ac

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# Configure template for GNU tar.  -*- autoconf -*-

# Copyright 1991, 1994-2010, 2013-2017 Free Software Foundation, Inc.

# This file is part of GNU tar.

# GNU tar is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.

# GNU tar is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

AC_INIT([GNU tar], [1.30], [bug-tar@gnu.org])
AC_CONFIG_SRCDIR([src/tar.c])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_HEADERS([config.h])
AC_PREREQ([2.63])
AM_INIT_AUTOMAKE([1.11 gnits tar-ustar dist-bzip2 dist-xz std-options silent-rules])

# Enable silent rules by default:
AM_SILENT_RULES([yes])

AC_PROG_CC_STDC
AC_EXEEXT
AC_PROG_RANLIB
AC_PROG_YACC
gl_EARLY
AC_CHECK_TOOLS([AR], [ar])

AC_SYS_LARGEFILE
AC_C_INLINE

AC_CHECK_HEADERS_ONCE(fcntl.h linux/fd.h memory.h net/errno.h \
  sgtty.h string.h \
  sys/param.h sys/device.h sys/gentape.h \
  sys/inet.h sys/io/trioctl.h \
  sys/mtio.h sys/time.h sys/tprintf.h sys/tape.h \
  unistd.h locale.h)

AC_CHECK_HEADERS([sys/buf.h], [], [],
[#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif])

AC_HEADER_MAJOR

AC_MSG_CHECKING([for st_fstype string in struct stat])
AC_CACHE_VAL(diff_cv_st_fstype_string,
  [AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/stat.h>], [struct stat s; s.st_fstype[0] = 'x';],
   diff_cv_st_fstype_string=yes,
   diff_cv_st_fstype_string=no)])
AC_MSG_RESULT($diff_cv_st_fstype_string)
if test $diff_cv_st_fstype_string = yes; then
  AC_DEFINE(HAVE_ST_FSTYPE_STRING, 1,
    [Define if struct stat has a char st_fstype[] member.])
fi

# even if we use gnulib's acl.h with integrated m4 file later on (used because
# of very useful file_has_acl() function) we need following checks that restrict
# tar to use POSIX.1e ACLs only.
AC_ARG_WITH([posix-acls],
    AS_HELP_STRING([--without-posix-acls],
                   [do not use POSIX.1e access control lists]),
    [],
    [with_posix_acls=yes])
if test "x$with_posix_acls" != "xno"; then
  AC_CHECK_HEADERS(sys/acl.h,, [with_posix_acls=no])
  for tar_acl_func in acl_get_file acl_get_fd acl_set_file acl_set_fd \
		      acl_to_text acl_from_text acl_delete_def_file \
		      acl_free; do \
    test "x$with_posix_acls" = xno && break
    AC_SEARCH_LIBS([$tar_acl_func], [acl pacl], [], [with_posix_acls=no])
  done
  if test "x$with_posix_acls" != xno; then
    AC_DEFINE(HAVE_POSIX_ACLS,,[Define when we have working POSIX acls])
  fi
else
  # disable acls in gnulib's checks
  export enable_acl=no
fi

AC_TYPE_MODE_T
AC_TYPE_PID_T
AC_TYPE_OFF_T
AC_TYPE_UID_T
AC_CHECK_TYPE(major_t, , AC_DEFINE(major_t, int,
				   [Type of major device numbers.]))
AC_CHECK_TYPE(minor_t, , AC_DEFINE(minor_t, int,
				   [Type of minor device numbers.]))
AC_CHECK_TYPE(dev_t, unsigned)
AC_CHECK_TYPE(ino_t, unsigned)

gt_TYPE_SSIZE_T

# gnulib modules
gl_INIT
# paxutils modules
tar_PAXUTILS

# gl_GCC_VERSION_IFELSE([major], [minor], [run-if-found], [run-if-not-found])
# ------------------------------------------------
# If $CPP is gcc-MAJOR.MINOR or newer, then run RUN-IF-FOUND.
# Otherwise, run RUN-IF-NOT-FOUND.
AC_DEFUN([gl_GCC_VERSION_IFELSE],
  [AC_PREPROC_IFELSE(
    [AC_LANG_PROGRAM(
      [[
#if ($1) < __GNUC__ || (($1) == __GNUC__ && ($2) <= __GNUC_MINOR__)
/* ok */
#else
# error "your version of gcc is older than $1.$2"
#endif
      ]]),
    ], [$3], [$4])
  ]
)

AC_ARG_ENABLE([gcc-warnings],
  [AS_HELP_STRING([--enable-gcc-warnings],
     [turn on many GCC warnings (for developers; best with GNU make)])],
  [case $enableval in
     yes|no) ;;
     *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
   esac
   gl_gcc_warnings=$enableval],
  [gl_gcc_warnings=no
   if test -d "$srcdir"/.git; then
     gl_GCC_VERSION_IFELSE([4], [6], [gl_gcc_warnings=yes])
   fi]
)

if test "$gl_gcc_warnings" = yes; then
  gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
  AC_SUBST([WERROR_CFLAGS])

  nw=
  # This, $nw, is the list of warnings we disable.
  nw="$nw -Wformat-nonliteral"      # warnings in Fedora 17 stdio.h
  nw="$nw -Wvla"                    # warnings in gettext.h
  nw="$nw -Wswitch-default"         # Too many warnings for now
  nw="$nw -Wunsafe-loop-optimizations" # It's OK to omit unsafe optimizations.
  nw="$nw -Winline"                 # It's OK to not inline.
  nw="$nw -Wstrict-overflow"	    # It's OK to optimize strictly.
  nw="$nw -Wsuggest-attribute=pure" # Too many warnings for now.
  nw="$nw -Wstack-protector"

  gl_MANYWARN_ALL_GCC([ws])
  gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
  for w in $ws; do
    gl_WARN_ADD([$w])
  done
  gl_WARN_ADD([-Wno-sign-compare])     # Too many warnings for now
  gl_WARN_ADD([-Wno-type-limits])      # It's OK to optimize based on types.
  gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now
  gl_WARN_ADD([-Wno-format-nonliteral])
  
  gl_WARN_ADD([-fdiagnostics-show-option])
  gl_WARN_ADD([-funit-at-a-time])
  

  AC_SUBST([WARN_CFLAGS])

  AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
  AH_VERBATIM([FORTIFY_SOURCE],
  [/* Enable compile-time and run-time bounds-checking, and some warnings,
      without upsetting glibc 2.15+. */
   #if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
   # define _FORTIFY_SOURCE 2
   #endif
  ])
  AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])

  # Use a slightly smaller set of warning options for lib/.
  # Remove the following and save the result in GNULIB_WARN_CFLAGS.
  nw=
  nw="$nw -Wmissing-prototypes"
  nw="$nw -Wunused-macros"
  #
  # These are for argp.
  nw="$nw -Wmissing-field-initializers"
  nw="$nw -Wshadow"
  #
  gl_MANYWARN_COMPLEMENT([GNULIB_WARN_CFLAGS], [$WARN_CFLAGS], [$nw])

  # This is also for argp.
  gl_WARN_ADD([-Wno-missing-field-initializers], [GNULIB_WARN_CFLAGS])

  AC_SUBST([GNULIB_WARN_CFLAGS])

  # For gnulib-tests, the set is slightly smaller still.
  nw=
  # It's not worth being this picky about test programs.
  nw="$nw -Wsuggest-attribute=const"
  gl_MANYWARN_COMPLEMENT([GNULIB_TEST_WARN_CFLAGS],
                         [$GNULIB_WARN_CFLAGS], [$nw])
  AC_SUBST([GNULIB_TEST_WARN_CFLAGS])
fi

TAR_HEADERS_ATTR_XATTR_H

AC_CHECK_FUNCS_ONCE([fchmod fchown fsync lstat mkfifo readlink symlink])

AC_CHECK_DECLS([getgrgid],,, [#include <grp.h>])
AC_CHECK_DECLS([getpwuid],,, [#include <pwd.h>])
AC_CHECK_DECLS([time],,, [#include <time.h>])

AC_REPLACE_FUNCS(waitpid)

AC_ARG_VAR([RSH], [Configure absolute path to default remote shell binary])
AC_CACHE_CHECK(for remote shell, tar_cv_path_RSH,
  [if test -n "$RSH"; then
    tar_cv_path_RSH=$RSH
  else
    tar_cv_path_RSH=no
    for ac_file in /usr/ucb/rsh /usr/bin/remsh /usr/bin/rsh /usr/bsd/rsh \
	/usr/bin/nsh /usr/bin/rcmd
    do
      # Prefer a non-symlink rsh to a symlink one, so that binaries built
      # on AIX 4.1.4, where /usr/ucb/rsh is a symlink to /usr/bin/rsh
      # will run on AIX 4.3.0, which has only /usr/bin/rsh.
      if test -f $ac_file; then
	if (test -h $ac_file) 2>/dev/null; then
	  test $tar_cv_path_RSH = no && tar_cv_path_RSH=$ac_file
	else
	  tar_cv_path_RSH=$ac_file
	  break
	fi
      fi
    done
  fi])
if test $tar_cv_path_RSH = no; then
  AC_CHECK_HEADERS(netdb.h)
else
  AC_DEFINE_UNQUOTED(REMOTE_SHELL, "$tar_cv_path_RSH",
    [Define to the full path of your rsh, if any.])
fi

TAR_COMPR_PROGRAM(compress)
TAR_COMPR_PROGRAM(gzip)
TAR_COMPR_PROGRAM(bzip2)
TAR_COMPR_PROGRAM(lzip)
TAR_COMPR_PROGRAM(lzma)
TAR_COMPR_PROGRAM(lzop)
TAR_COMPR_PROGRAM(xz)
TAR_COMPR_PROGRAM(zstd)

AC_MSG_CHECKING(for default archive format)

AC_ARG_VAR([DEFAULT_ARCHIVE_FORMAT],
           [Set the default archive format. Allowed values are: V7, OLDGNU, USTAR, POSIX, GNU. Default is GNU])

if test -z "$DEFAULT_ARCHIVE_FORMAT"; then
  DEFAULT_ARCHIVE_FORMAT="GNU"
fi
case $DEFAULT_ARCHIVE_FORMAT in
  V7|OLDGNU|USTAR|POSIX|GNU) ;;
  *) AC_MSG_ERROR(Invalid format name);;
esac
AC_DEFINE_UNQUOTED(DEFAULT_ARCHIVE_FORMAT, ${DEFAULT_ARCHIVE_FORMAT}_FORMAT,
  [By default produce archives of this format])
AC_MSG_RESULT($DEFAULT_ARCHIVE_FORMAT)

AC_MSG_CHECKING(for default archive)

AC_ARG_VAR([DEFAULT_ARCHIVE],
           [Set the name of the default archive (default: -)])
if test -z "$DEFAULT_ARCHIVE"; then
  DEFAULT_ARCHIVE=-
else
  if test -z "`ls $DEFAULT_ARCHIVE 2>/dev/null`"; then
    AC_MSG_WARN(DEFAULT_ARCHIVE '$DEFAULT_ARCHIVE' not found on this system)
  fi
  # FIXME: Look for DEFTAPE in <sys/mtio.h>.
  # FIXME: Let DEVICE_PREFIX be configured from the environment.
  # FIXME: Rearrange, here.
  case $DEFAULT_ARCHIVE in
    *[[0-7][lmh]])
      AC_DEFINE(DENSITY_LETTER, 1,
	[Define to 1 if density may be indicated by [lmh] at end of device.])
      device_prefix=`echo $DEFAULT_ARCHIVE | sed 's/[0-7][lmh]$//'`
      ;;
    *[[0-7]])
      device_prefix=`echo $DEFAULT_ARCHIVE | sed 's/[0-7]$//'`
      ;;
    *)
      device_prefix=
      ;;
  esac
  case "$device_prefix" in
    ?*)
      AC_DEFINE_UNQUOTED(DEVICE_PREFIX, "$device_prefix",
	[Define to a string giving the prefix of the default device, without the part specifying the unit and density.])
      ;;
  esac
fi
AC_DEFINE_UNQUOTED(DEFAULT_ARCHIVE, "$DEFAULT_ARCHIVE",
  [Define to a string giving the full name of the default archive file.])
AC_MSG_RESULT($DEFAULT_ARCHIVE)

AC_ARG_VAR([DEFAULT_BLOCKING],
           [Define default blocking factor (default: 20)])
AC_MSG_CHECKING(for default blocking)
DEFAULT_BLOCKING=${DEFAULT_BLOCKING-20}
AC_DEFINE_UNQUOTED(DEFAULT_BLOCKING, $DEFAULT_BLOCKING,
  [Define to a number giving the default blocking size for archives.])
AC_MSG_RESULT($DEFAULT_BLOCKING)

AC_MSG_CHECKING(for default quoting style)

m4_define([QUOTING_STYLES],dnl
          [literal|shell|shell-always|c|escape|locale|clocale])
DEFAULT_QUOTING_STYLE="escape"
AC_ARG_VAR([DEFAULT_QUOTING_STYLE],
           [Set the default quoting style. Allowed values are: ] m4_bpatsubst(QUOTING_STYLES,[|], [[, ]]) [. Default is "escape".])

case $DEFAULT_QUOTING_STYLE in
QUOTING_STYLES) ;;
*)  AC_MSG_ERROR(Invalid quoting style);;
esac
AC_MSG_RESULT($DEFAULT_QUOTING_STYLE)
DEFAULT_QUOTING_STYLE=`echo ${DEFAULT_QUOTING_STYLE}|sed 's/-/_/g'`_quoting_style
AC_DEFINE_UNQUOTED(DEFAULT_QUOTING_STYLE, $DEFAULT_QUOTING_STYLE,
  [Define to a default quoting style (see lib/quoteargs.c for the list)])

# Iconv
AM_ICONV
AC_CHECK_HEADERS(iconv.h)
AC_CHECK_TYPE(iconv_t,:,
              AC_DEFINE(iconv_t, int,
                        [Conversion descriptor type]),
              [
#ifdef HAVE_ICONV_H
# include <iconv.h>
#endif
])

# Gettext.
AM_GNU_GETTEXT([external], [need-formatstring-macros])
AM_GNU_GETTEXT_VERSION([0.16])

# Initialize the test suite.
AC_CONFIG_TESTDIR(tests)
AC_CONFIG_FILES([tests/Makefile tests/atlocal]) # FIXME: tests/preset?
AM_MISSING_PROG([AUTOM4TE], [autom4te])

AC_SUBST(BACKUP_LIBEXEC_SCRIPTS)
AC_SUBST(BACKUP_SBIN_SCRIPTS)
AC_ARG_ENABLE(backup-scripts,
	      AC_HELP_STRING([--enable-backup-scripts],
                             [Create and install backup and restore scripts]),
              [case $enableval in
	       yes) BACKUP_LIBEXEC_SCRIPTS='$(BACKUP_LIBEXEC_SCRIPTS_LIST)'
                    BACKUP_SBIN_SCRIPTS='$(BACKUP_SBIN_SCRIPTS_LIST)'
                    ;;
               esac])

AC_SUBST(BACKUP_SED_COND)
if date +%Y-%m-%d 2>/dev/null >&2; then
	BACKUP_SED_COND='/^\#ELSE_DATE_FORMAT_OK/,/^\#ENDIF_DATE_FORMAT_OK/d;/^\#IF_DATE_FORMAT_OK/d'
else
	BACKUP_SED_COND='/^\#IF_DATE_FORMAT_OK/,/^\#ELSE_DATE_FORMAT_OK/d;/^\#ENDIF_DATE_FORMAT_OK/d'
fi

AC_OUTPUT([Makefile\
           doc/Makefile\
	   gnu/Makefile\
           lib/Makefile\
           po/Makefile.in\
           scripts/Makefile\
           rmt/Makefile\
           src/Makefile])