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source: vbox/trunk/src/libs/libpng-1.6.42/aclocal.m4

Last change on this file was 103316, checked in by vboxsync, 4 months ago

libpng-1.6.42: Applied and adjusted our libpng changes to 1.6.42. bugref:8515

  • Property svn:eol-style set to native
File size: 43.9 KB
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5# This file is free software; the Free Software Foundation
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534AC_PROVIDE_IFELSE([AC_PROG_OBJC],
535 [_AM_DEPENDENCIES([OBJC])],
536 [m4_define([AC_PROG_OBJC],
537 m4_defn([AC_PROG_OBJC])[_AM_DEPENDENCIES([OBJC])])])dnl
538AC_PROVIDE_IFELSE([AC_PROG_OBJCXX],
539 [_AM_DEPENDENCIES([OBJCXX])],
540 [m4_define([AC_PROG_OBJCXX],
541 m4_defn([AC_PROG_OBJCXX])[_AM_DEPENDENCIES([OBJCXX])])])dnl
542])
543# Variables for tags utilities; see am/tags.am
544if test -z "$CTAGS"; then
545 CTAGS=ctags
546fi
547AC_SUBST([CTAGS])
548if test -z "$ETAGS"; then
549 ETAGS=etags
550fi
551AC_SUBST([ETAGS])
552if test -z "$CSCOPE"; then
553 CSCOPE=cscope
554fi
555AC_SUBST([CSCOPE])
556
557AC_REQUIRE([AM_SILENT_RULES])dnl
558dnl The testsuite driver may need to know about EXEEXT, so add the
559dnl 'am__EXEEXT' conditional if _AM_COMPILER_EXEEXT was seen. This
560dnl macro is hooked onto _AC_COMPILER_EXEEXT early, see below.
561AC_CONFIG_COMMANDS_PRE(dnl
562[m4_provide_if([_AM_COMPILER_EXEEXT],
563 [AM_CONDITIONAL([am__EXEEXT], [test -n "$EXEEXT"])])])dnl
564
565# POSIX will say in a future version that running "rm -f" with no argument
566# is OK; and we want to be able to make that assumption in our Makefile
567# recipes. So use an aggressive probe to check that the usage we want is
568# actually supported "in the wild" to an acceptable degree.
569# See automake bug#10828.
570# To make any issue more visible, cause the running configure to be aborted
571# by default if the 'rm' program in use doesn't match our expectations; the
572# user can still override this though.
573if rm -f && rm -fr && rm -rf; then : OK; else
574 cat >&2 <<'END'
575Oops!
576
577Your 'rm' program seems unable to run without file operands specified
578on the command line, even when the '-f' option is present. This is contrary
579to the behaviour of most rm programs out there, and not conforming with
580the upcoming POSIX standard: <http://austingroupbugs.net/view.php?id=542>
581
582Please tell bug-automake@gnu.org about your system, including the value
583of your $PATH and any error possibly output before this message. This
584can help us improve future automake versions.
585
586END
587 if test x"$ACCEPT_INFERIOR_RM_PROGRAM" = x"yes"; then
588 echo 'Configuration will proceed anyway, since you have set the' >&2
589 echo 'ACCEPT_INFERIOR_RM_PROGRAM variable to "yes"' >&2
590 echo >&2
591 else
592 cat >&2 <<'END'
593Aborting the configuration process, to ensure you take notice of the issue.
594
595You can download and install GNU coreutils to get an 'rm' implementation
596that behaves properly: <https://www.gnu.org/software/coreutils/>.
597
598If you want to complete the configuration process using your problematic
599'rm' anyway, export the environment variable ACCEPT_INFERIOR_RM_PROGRAM
600to "yes", and re-run configure.
601
602END
603 AC_MSG_ERROR([Your 'rm' program is bad, sorry.])
604 fi
605fi
606dnl The trailing newline in this macro's definition is deliberate, for
607dnl backward compatibility and to allow trailing 'dnl'-style comments
608dnl after the AM_INIT_AUTOMAKE invocation. See automake bug#16841.
609])
610
611dnl Hook into '_AC_COMPILER_EXEEXT' early to learn its expansion. Do not
612dnl add the conditional right here, as _AC_COMPILER_EXEEXT may be further
613dnl mangled by Autoconf and run in a shell conditional statement.
614m4_define([_AC_COMPILER_EXEEXT],
615m4_defn([_AC_COMPILER_EXEEXT])[m4_provide([_AM_COMPILER_EXEEXT])])
616
617# When config.status generates a header, we must update the stamp-h file.
618# This file resides in the same directory as the config header
619# that is generated. The stamp files are numbered to have different names.
620
621# Autoconf calls _AC_AM_CONFIG_HEADER_HOOK (when defined) in the
622# loop where config.status creates the headers, so we can generate
623# our stamp files there.
624AC_DEFUN([_AC_AM_CONFIG_HEADER_HOOK],
625[# Compute $1's index in $config_headers.
626_am_arg=$1
627_am_stamp_count=1
628for _am_header in $config_headers :; do
629 case $_am_header in
630 $_am_arg | $_am_arg:* )
631 break ;;
632 * )
633 _am_stamp_count=`expr $_am_stamp_count + 1` ;;
634 esac
635done
636echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_count])
637
638# Copyright (C) 2001-2021 Free Software Foundation, Inc.
639#
640# This file is free software; the Free Software Foundation
641# gives unlimited permission to copy and/or distribute it,
642# with or without modifications, as long as this notice is preserved.
643
644# AM_PROG_INSTALL_SH
645# ------------------
646# Define $install_sh.
647AC_DEFUN([AM_PROG_INSTALL_SH],
648[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
649if test x"${install_sh+set}" != xset; then
650 case $am_aux_dir in
651 *\ * | *\ *)
652 install_sh="\${SHELL} '$am_aux_dir/install-sh'" ;;
653 *)
654 install_sh="\${SHELL} $am_aux_dir/install-sh"
655 esac
656fi
657AC_SUBST([install_sh])])
658
659# Copyright (C) 2003-2021 Free Software Foundation, Inc.
660#
661# This file is free software; the Free Software Foundation
662# gives unlimited permission to copy and/or distribute it,
663# with or without modifications, as long as this notice is preserved.
664
665# Check whether the underlying file-system supports filenames
666# with a leading dot. For instance MS-DOS doesn't.
667AC_DEFUN([AM_SET_LEADING_DOT],
668[rm -rf .tst 2>/dev/null
669mkdir .tst 2>/dev/null
670if test -d .tst; then
671 am__leading_dot=.
672else
673 am__leading_dot=_
674fi
675rmdir .tst 2>/dev/null
676AC_SUBST([am__leading_dot])])
677
678# Add --enable-maintainer-mode option to configure. -*- Autoconf -*-
679# From Jim Meyering
680
681# Copyright (C) 1996-2021 Free Software Foundation, Inc.
682#
683# This file is free software; the Free Software Foundation
684# gives unlimited permission to copy and/or distribute it,
685# with or without modifications, as long as this notice is preserved.
686
687# AM_MAINTAINER_MODE([DEFAULT-MODE])
688# ----------------------------------
689# Control maintainer-specific portions of Makefiles.
690# Default is to disable them, unless 'enable' is passed literally.
691# For symmetry, 'disable' may be passed as well. Anyway, the user
692# can override the default with the --enable/--disable switch.
693AC_DEFUN([AM_MAINTAINER_MODE],
694[m4_case(m4_default([$1], [disable]),
695 [enable], [m4_define([am_maintainer_other], [disable])],
696 [disable], [m4_define([am_maintainer_other], [enable])],
697 [m4_define([am_maintainer_other], [enable])
698 m4_warn([syntax], [unexpected argument to AM@&t@_MAINTAINER_MODE: $1])])
699AC_MSG_CHECKING([whether to enable maintainer-specific portions of Makefiles])
700 dnl maintainer-mode's default is 'disable' unless 'enable' is passed
701 AC_ARG_ENABLE([maintainer-mode],
702 [AS_HELP_STRING([--]am_maintainer_other[-maintainer-mode],
703 am_maintainer_other[ make rules and dependencies not useful
704 (and sometimes confusing) to the casual installer])],
705 [USE_MAINTAINER_MODE=$enableval],
706 [USE_MAINTAINER_MODE=]m4_if(am_maintainer_other, [enable], [no], [yes]))
707 AC_MSG_RESULT([$USE_MAINTAINER_MODE])
708 AM_CONDITIONAL([MAINTAINER_MODE], [test $USE_MAINTAINER_MODE = yes])
709 MAINT=$MAINTAINER_MODE_TRUE
710 AC_SUBST([MAINT])dnl
711]
712)
713
714# Check to see how 'make' treats includes. -*- Autoconf -*-
715
716# Copyright (C) 2001-2021 Free Software Foundation, Inc.
717#
718# This file is free software; the Free Software Foundation
719# gives unlimited permission to copy and/or distribute it,
720# with or without modifications, as long as this notice is preserved.
721
722# AM_MAKE_INCLUDE()
723# -----------------
724# Check whether make has an 'include' directive that can support all
725# the idioms we need for our automatic dependency tracking code.
726AC_DEFUN([AM_MAKE_INCLUDE],
727[AC_MSG_CHECKING([whether ${MAKE-make} supports the include directive])
728cat > confinc.mk << 'END'
729am__doit:
730 @echo this is the am__doit target >confinc.out
731.PHONY: am__doit
732END
733am__include="#"
734am__quote=
735# BSD make does it like this.
736echo '.include "confinc.mk" # ignored' > confmf.BSD
737# Other make implementations (GNU, Solaris 10, AIX) do it like this.
738echo 'include confinc.mk # ignored' > confmf.GNU
739_am_result=no
740for s in GNU BSD; do
741 AM_RUN_LOG([${MAKE-make} -f confmf.$s && cat confinc.out])
742 AS_CASE([$?:`cat confinc.out 2>/dev/null`],
743 ['0:this is the am__doit target'],
744 [AS_CASE([$s],
745 [BSD], [am__include='.include' am__quote='"'],
746 [am__include='include' am__quote=''])])
747 if test "$am__include" != "#"; then
748 _am_result="yes ($s style)"
749 break
750 fi
751done
752rm -f confinc.* confmf.*
753AC_MSG_RESULT([${_am_result}])
754AC_SUBST([am__include])])
755AC_SUBST([am__quote])])
756
757# Fake the existence of programs that GNU maintainers use. -*- Autoconf -*-
758
759# Copyright (C) 1997-2021 Free Software Foundation, Inc.
760#
761# This file is free software; the Free Software Foundation
762# gives unlimited permission to copy and/or distribute it,
763# with or without modifications, as long as this notice is preserved.
764
765# AM_MISSING_PROG(NAME, PROGRAM)
766# ------------------------------
767AC_DEFUN([AM_MISSING_PROG],
768[AC_REQUIRE([AM_MISSING_HAS_RUN])
769$1=${$1-"${am_missing_run}$2"}
770AC_SUBST($1)])
771
772# AM_MISSING_HAS_RUN
773# ------------------
774# Define MISSING if not defined so far and test if it is modern enough.
775# If it is, set am_missing_run to use it, otherwise, to nothing.
776AC_DEFUN([AM_MISSING_HAS_RUN],
777[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
778AC_REQUIRE_AUX_FILE([missing])dnl
779if test x"${MISSING+set}" != xset; then
780 MISSING="\${SHELL} '$am_aux_dir/missing'"
781fi
782# Use eval to expand $SHELL
783if eval "$MISSING --is-lightweight"; then
784 am_missing_run="$MISSING "
785else
786 am_missing_run=
787 AC_MSG_WARN(['missing' script is too old or missing])
788fi
789])
790
791# Helper functions for option handling. -*- Autoconf -*-
792
793# Copyright (C) 2001-2021 Free Software Foundation, Inc.
794#
795# This file is free software; the Free Software Foundation
796# gives unlimited permission to copy and/or distribute it,
797# with or without modifications, as long as this notice is preserved.
798
799# _AM_MANGLE_OPTION(NAME)
800# -----------------------
801AC_DEFUN([_AM_MANGLE_OPTION],
802[[_AM_OPTION_]m4_bpatsubst($1, [[^a-zA-Z0-9_]], [_])])
803
804# _AM_SET_OPTION(NAME)
805# --------------------
806# Set option NAME. Presently that only means defining a flag for this option.
807AC_DEFUN([_AM_SET_OPTION],
808[m4_define(_AM_MANGLE_OPTION([$1]), [1])])
809
810# _AM_SET_OPTIONS(OPTIONS)
811# ------------------------
812# OPTIONS is a space-separated list of Automake options.
813AC_DEFUN([_AM_SET_OPTIONS],
814[m4_foreach_w([_AM_Option], [$1], [_AM_SET_OPTION(_AM_Option)])])
815
816# _AM_IF_OPTION(OPTION, IF-SET, [IF-NOT-SET])
817# -------------------------------------------
818# Execute IF-SET if OPTION is set, IF-NOT-SET otherwise.
819AC_DEFUN([_AM_IF_OPTION],
820[m4_ifset(_AM_MANGLE_OPTION([$1]), [$2], [$3])])
821
822# Copyright (C) 1999-2021 Free Software Foundation, Inc.
823#
824# This file is free software; the Free Software Foundation
825# gives unlimited permission to copy and/or distribute it,
826# with or without modifications, as long as this notice is preserved.
827
828# _AM_PROG_CC_C_O
829# ---------------
830# Like AC_PROG_CC_C_O, but changed for automake. We rewrite AC_PROG_CC
831# to automatically call this.
832AC_DEFUN([_AM_PROG_CC_C_O],
833[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
834AC_REQUIRE_AUX_FILE([compile])dnl
835AC_LANG_PUSH([C])dnl
836AC_CACHE_CHECK(
837 [whether $CC understands -c and -o together],
838 [am_cv_prog_cc_c_o],
839 [AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
840 # Make sure it works both with $CC and with simple cc.
841 # Following AC_PROG_CC_C_O, we do the test twice because some
842 # compilers refuse to overwrite an existing .o file with -o,
843 # though they will create one.
844 am_cv_prog_cc_c_o=yes
845 for am_i in 1 2; do
846 if AM_RUN_LOG([$CC -c conftest.$ac_ext -o conftest2.$ac_objext]) \
847 && test -f conftest2.$ac_objext; then
848 : OK
849 else
850 am_cv_prog_cc_c_o=no
851 break
852 fi
853 done
854 rm -f core conftest*
855 unset am_i])
856if test "$am_cv_prog_cc_c_o" != yes; then
857 # Losing compiler, so override with the script.
858 # FIXME: It is wrong to rewrite CC.
859 # But if we don't then we get into trouble of one sort or another.
860 # A longer-term fix would be to have automake use am__CC in this case,
861 # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
862 CC="$am_aux_dir/compile $CC"
863fi
864AC_LANG_POP([C])])
865
866# For backward compatibility.
867AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])
868
869# Copyright (C) 2001-2021 Free Software Foundation, Inc.
870#
871# This file is free software; the Free Software Foundation
872# gives unlimited permission to copy and/or distribute it,
873# with or without modifications, as long as this notice is preserved.
874
875# AM_RUN_LOG(COMMAND)
876# -------------------
877# Run COMMAND, save the exit status in ac_status, and log it.
878# (This has been adapted from Autoconf's _AC_RUN_LOG macro.)
879AC_DEFUN([AM_RUN_LOG],
880[{ echo "$as_me:$LINENO: $1" >&AS_MESSAGE_LOG_FD
881 ($1) >&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD
882 ac_status=$?
883 echo "$as_me:$LINENO: \$? = $ac_status" >&AS_MESSAGE_LOG_FD
884 (exit $ac_status); }])
885
886# Check to make sure that the build environment is sane. -*- Autoconf -*-
887
888# Copyright (C) 1996-2021 Free Software Foundation, Inc.
889#
890# This file is free software; the Free Software Foundation
891# gives unlimited permission to copy and/or distribute it,
892# with or without modifications, as long as this notice is preserved.
893
894# AM_SANITY_CHECK
895# ---------------
896AC_DEFUN([AM_SANITY_CHECK],
897[AC_MSG_CHECKING([whether build environment is sane])
898# Reject unsafe characters in $srcdir or the absolute working directory
899# name. Accept space and tab only in the latter.
900am_lf='
901'
902case `pwd` in
903 *[[\\\"\#\$\&\'\`$am_lf]]*)
904 AC_MSG_ERROR([unsafe absolute working directory name]);;
905esac
906case $srcdir in
907 *[[\\\"\#\$\&\'\`$am_lf\ \ ]]*)
908 AC_MSG_ERROR([unsafe srcdir value: '$srcdir']);;
909esac
910
911# Do 'set' in a subshell so we don't clobber the current shell's
912# arguments. Must try -L first in case configure is actually a
913# symlink; some systems play weird games with the mod time of symlinks
914# (eg FreeBSD returns the mod time of the symlink's containing
915# directory).
916if (
917 am_has_slept=no
918 for am_try in 1 2; do
919 echo "timestamp, slept: $am_has_slept" > conftest.file
920 set X `ls -Lt "$srcdir/configure" conftest.file 2> /dev/null`
921 if test "$[*]" = "X"; then
922 # -L didn't work.
923 set X `ls -t "$srcdir/configure" conftest.file`
924 fi
925 if test "$[*]" != "X $srcdir/configure conftest.file" \
926 && test "$[*]" != "X conftest.file $srcdir/configure"; then
927
928 # If neither matched, then we have a broken ls. This can happen
929 # if, for instance, CONFIG_SHELL is bash and it inherits a
930 # broken ls alias from the environment. This has actually
931 # happened. Such a system could not be considered "sane".
932 AC_MSG_ERROR([ls -t appears to fail. Make sure there is not a broken
933 alias in your environment])
934 fi
935 if test "$[2]" = conftest.file || test $am_try -eq 2; then
936 break
937 fi
938 # Just in case.
939 sleep 1
940 am_has_slept=yes
941 done
942 test "$[2]" = conftest.file
943 )
944then
945 # Ok.
946 :
947else
948 AC_MSG_ERROR([newly created file is older than distributed files!
949Check your system clock])
950fi
951AC_MSG_RESULT([yes])
952# If we didn't sleep, we still need to ensure time stamps of config.status and
953# generated files are strictly newer.
954am_sleep_pid=
955if grep 'slept: no' conftest.file >/dev/null 2>&1; then
956 ( sleep 1 ) &
957 am_sleep_pid=$!
958fi
959AC_CONFIG_COMMANDS_PRE(
960 [AC_MSG_CHECKING([that generated files are newer than configure])
961 if test -n "$am_sleep_pid"; then
962 # Hide warnings about reused PIDs.
963 wait $am_sleep_pid 2>/dev/null
964 fi
965 AC_MSG_RESULT([done])])
966rm -f conftest.file
967])
968
969# Copyright (C) 2009-2021 Free Software Foundation, Inc.
970#
971# This file is free software; the Free Software Foundation
972# gives unlimited permission to copy and/or distribute it,
973# with or without modifications, as long as this notice is preserved.
974
975# AM_SILENT_RULES([DEFAULT])
976# --------------------------
977# Enable less verbose build rules; with the default set to DEFAULT
978# ("yes" being less verbose, "no" or empty being verbose).
979AC_DEFUN([AM_SILENT_RULES],
980[AC_ARG_ENABLE([silent-rules], [dnl
981AS_HELP_STRING(
982 [--enable-silent-rules],
983 [less verbose build output (undo: "make V=1")])
984AS_HELP_STRING(
985 [--disable-silent-rules],
986 [verbose build output (undo: "make V=0")])dnl
987])
988case $enable_silent_rules in @%:@ (((
989 yes) AM_DEFAULT_VERBOSITY=0;;
990 no) AM_DEFAULT_VERBOSITY=1;;
991 *) AM_DEFAULT_VERBOSITY=m4_if([$1], [yes], [0], [1]);;
992esac
993dnl
994dnl A few 'make' implementations (e.g., NonStop OS and NextStep)
995dnl do not support nested variable expansions.
996dnl See automake bug#9928 and bug#10237.
997am_make=${MAKE-make}
998AC_CACHE_CHECK([whether $am_make supports nested variables],
999 [am_cv_make_support_nested_variables],
1000 [if AS_ECHO([['TRUE=$(BAR$(V))
1001BAR0=false
1002BAR1=true
1003V=1
1004am__doit:
1005 @$(TRUE)
1006.PHONY: am__doit']]) | $am_make -f - >/dev/null 2>&1; then
1007 am_cv_make_support_nested_variables=yes
1008else
1009 am_cv_make_support_nested_variables=no
1010fi])
1011if test $am_cv_make_support_nested_variables = yes; then
1012 dnl Using '$V' instead of '$(V)' breaks IRIX make.
1013 AM_V='$(V)'
1014 AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
1015else
1016 AM_V=$AM_DEFAULT_VERBOSITY
1017 AM_DEFAULT_V=$AM_DEFAULT_VERBOSITY
1018fi
1019AC_SUBST([AM_V])dnl
1020AM_SUBST_NOTMAKE([AM_V])dnl
1021AC_SUBST([AM_DEFAULT_V])dnl
1022AM_SUBST_NOTMAKE([AM_DEFAULT_V])dnl
1023AC_SUBST([AM_DEFAULT_VERBOSITY])dnl
1024AM_BACKSLASH='\'
1025AC_SUBST([AM_BACKSLASH])dnl
1026_AM_SUBST_NOTMAKE([AM_BACKSLASH])dnl
1027])
1028
1029# Copyright (C) 2001-2021 Free Software Foundation, Inc.
1030#
1031# This file is free software; the Free Software Foundation
1032# gives unlimited permission to copy and/or distribute it,
1033# with or without modifications, as long as this notice is preserved.
1034
1035# AM_PROG_INSTALL_STRIP
1036# ---------------------
1037# One issue with vendor 'install' (even GNU) is that you can't
1038# specify the program used to strip binaries. This is especially
1039# annoying in cross-compiling environments, where the build's strip
1040# is unlikely to handle the host's binaries.
1041# Fortunately install-sh will honor a STRIPPROG variable, so we
1042# always use install-sh in "make install-strip", and initialize
1043# STRIPPROG with the value of the STRIP variable (set by the user).
1044AC_DEFUN([AM_PROG_INSTALL_STRIP],
1045[AC_REQUIRE([AM_PROG_INSTALL_SH])dnl
1046# Installed binaries are usually stripped using 'strip' when the user
1047# run "make install-strip". However 'strip' might not be the right
1048# tool to use in cross-compilation environments, therefore Automake
1049# will honor the 'STRIP' environment variable to overrule this program.
1050dnl Don't test for $cross_compiling = yes, because it might be 'maybe'.
1051if test "$cross_compiling" != no; then
1052 AC_CHECK_TOOL([STRIP], [strip], :)
1053fi
1054INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
1055AC_SUBST([INSTALL_STRIP_PROGRAM])])
1056
1057# Copyright (C) 2006-2021 Free Software Foundation, Inc.
1058#
1059# This file is free software; the Free Software Foundation
1060# gives unlimited permission to copy and/or distribute it,
1061# with or without modifications, as long as this notice is preserved.
1062
1063# _AM_SUBST_NOTMAKE(VARIABLE)
1064# ---------------------------
1065# Prevent Automake from outputting VARIABLE = @VARIABLE@ in Makefile.in.
1066# This macro is traced by Automake.
1067AC_DEFUN([_AM_SUBST_NOTMAKE])
1068
1069# AM_SUBST_NOTMAKE(VARIABLE)
1070# --------------------------
1071# Public sister of _AM_SUBST_NOTMAKE.
1072AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
1073
1074# Check how to create a tarball. -*- Autoconf -*-
1075
1076# Copyright (C) 2004-2021 Free Software Foundation, Inc.
1077#
1078# This file is free software; the Free Software Foundation
1079# gives unlimited permission to copy and/or distribute it,
1080# with or without modifications, as long as this notice is preserved.
1081
1082# _AM_PROG_TAR(FORMAT)
1083# --------------------
1084# Check how to create a tarball in format FORMAT.
1085# FORMAT should be one of 'v7', 'ustar', or 'pax'.
1086#
1087# Substitute a variable $(am__tar) that is a command
1088# writing to stdout a FORMAT-tarball containing the directory
1089# $tardir.
1090# tardir=directory && $(am__tar) > result.tar
1091#
1092# Substitute a variable $(am__untar) that extract such
1093# a tarball read from stdin.
1094# $(am__untar) < result.tar
1095#
1096AC_DEFUN([_AM_PROG_TAR],
1097[# Always define AMTAR for backward compatibility. Yes, it's still used
1098# in the wild :-( We should find a proper way to deprecate it ...
1099AC_SUBST([AMTAR], ['$${TAR-tar}'])
1100
1101# We'll loop over all known methods to create a tar archive until one works.
1102_am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'
1103
1104m4_if([$1], [v7],
1105 [am__tar='$${TAR-tar} chof - "$$tardir"' am__untar='$${TAR-tar} xf -'],
1106
1107 [m4_case([$1],
1108 [ustar],
1109 [# The POSIX 1988 'ustar' format is defined with fixed-size fields.
1110 # There is notably a 21 bits limit for the UID and the GID. In fact,
1111 # the 'pax' utility can hang on bigger UID/GID (see automake bug#8343
1112 # and bug#13588).
1113 am_max_uid=2097151 # 2^21 - 1
1114 am_max_gid=$am_max_uid
1115 # The $UID and $GID variables are not portable, so we need to resort
1116 # to the POSIX-mandated id(1) utility. Errors in the 'id' calls
1117 # below are definitely unexpected, so allow the users to see them
1118 # (that is, avoid stderr redirection).
1119 am_uid=`id -u || echo unknown`
1120 am_gid=`id -g || echo unknown`
1121 AC_MSG_CHECKING([whether UID '$am_uid' is supported by ustar format])
1122 if test $am_uid -le $am_max_uid; then
1123 AC_MSG_RESULT([yes])
1124 else
1125 AC_MSG_RESULT([no])
1126 _am_tools=none
1127 fi
1128 AC_MSG_CHECKING([whether GID '$am_gid' is supported by ustar format])
1129 if test $am_gid -le $am_max_gid; then
1130 AC_MSG_RESULT([yes])
1131 else
1132 AC_MSG_RESULT([no])
1133 _am_tools=none
1134 fi],
1135
1136 [pax],
1137 [],
1138
1139 [m4_fatal([Unknown tar format])])
1140
1141 AC_MSG_CHECKING([how to create a $1 tar archive])
1142
1143 # Go ahead even if we have the value already cached. We do so because we
1144 # need to set the values for the 'am__tar' and 'am__untar' variables.
1145 _am_tools=${am_cv_prog_tar_$1-$_am_tools}
1146
1147 for _am_tool in $_am_tools; do
1148 case $_am_tool in
1149 gnutar)
1150 for _am_tar in tar gnutar gtar; do
1151 AM_RUN_LOG([$_am_tar --version]) && break
1152 done
1153 am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'
1154 am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'
1155 am__untar="$_am_tar -xf -"
1156 ;;
1157 plaintar)
1158 # Must skip GNU tar: if it does not support --format= it doesn't create
1159 # ustar tarball either.
1160 (tar --version) >/dev/null 2>&1 && continue
1161 am__tar='tar chf - "$$tardir"'
1162 am__tar_='tar chf - "$tardir"'
1163 am__untar='tar xf -'
1164 ;;
1165 pax)
1166 am__tar='pax -L -x $1 -w "$$tardir"'
1167 am__tar_='pax -L -x $1 -w "$tardir"'
1168 am__untar='pax -r'
1169 ;;
1170 cpio)
1171 am__tar='find "$$tardir" -print | cpio -o -H $1 -L'
1172 am__tar_='find "$tardir" -print | cpio -o -H $1 -L'
1173 am__untar='cpio -i -H $1 -d'
1174 ;;
1175 none)
1176 am__tar=false
1177 am__tar_=false
1178 am__untar=false
1179 ;;
1180 esac
1181
1182 # If the value was cached, stop now. We just wanted to have am__tar
1183 # and am__untar set.
1184 test -n "${am_cv_prog_tar_$1}" && break
1185
1186 # tar/untar a dummy directory, and stop if the command works.
1187 rm -rf conftest.dir
1188 mkdir conftest.dir
1189 echo GrepMe > conftest.dir/file
1190 AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])
1191 rm -rf conftest.dir
1192 if test -s conftest.tar; then
1193 AM_RUN_LOG([$am__untar <conftest.tar])
1194 AM_RUN_LOG([cat conftest.dir/file])
1195 grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
1196 fi
1197 done
1198 rm -rf conftest.dir
1199
1200 AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
1201 AC_MSG_RESULT([$am_cv_prog_tar_$1])])
1202
1203AC_SUBST([am__tar])
1204AC_SUBST([am__untar])
1205]) # _AM_PROG_TAR
1206
1207m4_include([scripts/autoconf/libtool.m4])
1208m4_include([scripts/autoconf/ltoptions.m4])
1209m4_include([scripts/autoconf/ltsugar.m4])
1210m4_include([scripts/autoconf/ltversion.m4])
1211m4_include([scripts/autoconf/lt~obsolete.m4])
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