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dnl What are we running
AC_INIT(kitsh, 0.0)

dnl Checks for programs.
AC_PROG_CC
AC_PROG_MAKE_SET
AC_PROG_INSTALL
AC_AIX
AC_GNU_SOURCE

dnl Find out if we should build a DLL or an Executable
TARGET="tclkit"
EXTRA_KIT_DEPS=""
AC_MSG_CHECKING([what target to build])
AC_ARG_ENABLE(kitdll, AC_HELP_STRING([--enable-kitdll], [Enable building KitDLL instead of Tclkit (default: no)]), [
	AS_CASE([$enableval],
		[yes|kitdll], [
			TARGET="kitdll"
		],
		no, [
			true
		], [
			AC_MSG_RESULT([unknown])

			AC_MSG_ERROR([Invalid option: $enableval])
		]
	)
])
AC_MSG_RESULT([$TARGET])

dnl Find the appropriate libraries to link to
AC_SEARCH_LIBS(acos, m,, [ AC_MSG_WARN([Couldn't find acos (normally in libm)!]) ])
AC_SEARCH_LIBS(dlsym, dl,, [ AC_MSG_WARN([Couldn't find dlsym (normally in libdl)!]) ])

AS_IF([test "$TARGET" = "tclkit"], [
	dnl We have Tclkit

dnl Figure out how to statically link to libgcc, if needed
DC_STATIC_LIBGCC
	dnl Figure out how to statically link to libgcc, if needed
	DC_STATIC_LIBGCC

	dnl Specify local Appinit function
	AC_DEFINE(TK_LOCAL_APPINIT, [TclKit_AppInit], [Tclkit appinit function])
], [
	dnl We have KitDLL

	dnl Determine system information
	DC_CHK_OS_INFO

	dnl Determine how to create a shared object
	DC_GET_SHOBJFLAGS

	dnl Determine if we have "objcopy" available to weaken non-Tcl/Tk symbols
	AC_CHECK_TOOL(OBJCOPY, objcopy, [:])

	dnl Define KitDLL usage
	AC_DEFINE([TCLKIT_DLL], [1], [Define if you are using a KitDLL rather than a Tclkit])
])

dnl Set linker rpath for tclsh/wish
DC_SETLDRUNPATH([.])

dnl Find the appropriate Tcl headers and libraries
DC_DO_TCL

dnl Find archives we need to link to
DC_FIND_TCLKIT_LIBS

dnl Find extra objects we need to link as a part of "kit"
AC_SUBST(EXTRA_OBJS)
AC_SUBST(EXTRA_VFS_OBJS)

dnl Check for Windows Resource Compiler
AC_CHECK_TOOL([RC], [windres], [false])

dnl If we found the resource compiler, add "kit.res.o" to our list of objects to build
dnl (as long as the source for such an object exists)
if ! test "$RC" = "false"; then
	if test -f kit.rc; then
AS_IF([test "$RC" != "false"], [
	AS_IF([test -f kit.rc], [
		EXTRA_OBJS="$EXTRA_OBJS kit.res.o"
	fi
fi
	])
])

dnl Check for Tcl features
SAVE_LIBS="${LIBS}"
LIBS="${ARCHS} ${LIBS}"

dnl Determine if we have "Tcl_SetStartupScript" (8.6.x) or "TclSetStartupScriptPath" (8.4.x)
AC_CHECK_FUNCS(Tcl_SetStartupScript TclSetStartupScriptPath)

dnl Check for the ability to get the current system encoding
AC_CHECK_FUNCS(Tcl_GetEncodingNameFromEnvironment Tcl_SetSystemEncoding)
LIBS="${SAVE_LIBS}"

dnl Check for optional headers
AC_HEADER_STDC
AC_CHECK_HEADERS(unistd.h string.h strings.h)

dnl Check for optional system calls
AC_CHECK_FUNCS(readlink)

dnl Check for acceptable dladdr so we can find ourselves on Solaris
DC_CHECK_FOR_ACCEPTABLE_DLADDR

dnl Find zlib
AC_ARG_WITH(zlib, AC_HELP_STRING([--with-zlib], [directory containing zlib]), [
	CPPFLAGS="${CPPFLAGS} -I${with_zlib}/include -I${with_zlib}"
	CFLAGS="${CFLAGS} -I${with_zlib}/include -I${with_zlib}"
	LDFLAGS="${LDFLAGS} -L${with_zlib}/lib -L${with_zlib}"
])

dnl Only needed for Tclkit
DC_DO_STATIC_LINK_LIB(zlib, -lz,, [
	DC_DO_STATIC_LINK_LIB(zlib, -lzlib,, [
		AC_SEARCH_LIBS(inflate, z zlib,, [
			AC_MSG_WARN([Couldn't find inflate (normally in zlib)!])
		])
	])
])

dnl Determine which storage mechanism to use
AC_MSG_CHECKING([which Tclkit Storage mechanism to use])

storage_mech="auto"
AC_ARG_ENABLE(kit-storage, AC_HELP_STRING([--enable-kit-storage={zip|mk4}], [Use mk4 for storage (default: auto)]), [
	case "$enableval" in
		mk4)
			AC_MSG_RESULT([mk4])
AC_ARG_ENABLE(kit-storage, AC_HELP_STRING([--enable-kit-storage={zip|mk4|cvfs}], [Specify storage mechanism to use for built-in VFS (default: auto)]), [
	AS_CASE(["$enableval"],
		mk4, [
			storage_mech="mk4"
			AC_DEFINE([KIT_STORAGE_MK4], [1], [Define if you are going to use Metakit4 for kit storage])
			;;
		zip)
			AC_MSG_RESULT([zip])
			AC_DEFINE([KIT_STORAGE_ZIP], [1], [Define if you are going to use ZIP for kit storage])
		],
		zip, [
			storage_mech="zip"
		],
		cvfs, [
			storage_mech="cvfs"
			;;
		yes)
		],
		yes, [
			# If they just want to enable kit storage, but nothing specifically, do nothing
			AC_MSG_RESULT([auto])
			storage_mech="auto"
			;;
		auto)
		],
		auto, [
			# Auto is how it works by default
			AC_MSG_RESULT([auto])
			storage_mech="auto"
			;;
		no)
		],
		no, [
			# You can't disable kit storage
			AC_MSG_RESULT([fail])
			AC_MSG_ERROR([Kit Storage cannot be disabled])
			;;
		*)
		],
		[
			AC_MSG_RESULT([fail])
			AC_MSG_ERROR([Unknown kit storage type: $enableval])
		]
	)
])
			;;
	esac
], [
	AC_MSG_RESULT([auto])
])

dnl Explicitly define the storage mechanism
AS_IF([test "$storage_mech" = "auto"], [
	AS_IF([test "$TARGET" = 'tclkit'], [
		AS_IF([test "x$kc_cv_feature_kit_includes_mk4tcl" = 'x1'], [
			storage_mech="mk4"
		], [
			storage_mech="zip"
		])
	], [
		storage_mech="cvfs"
	])
])

dnl Note result
AC_MSG_RESULT([$storage_mech])

dnl Define appropriate macros for the storage mechanism
AS_CASE([$storage_mech],
	mk4, [
		AC_DEFINE([KIT_STORAGE_MK4], [1], [Define if you are going to use Metakit4 for kit storage])
	],
	zip, [
		AC_DEFINE([KIT_STORAGE_ZIP], [1], [Define if you are going to use ZIP for kit storage])

		dnl Add appropriate dependencies
		EXTRA_KIT_DEPS="zipvfs.tcl.h"
	],
	cvfs, [
		AC_DEFINE([KIT_STORAGE_CVFS], [1], [Define if you are going to use C-VFS for kit storage])

		dnl Define that C-VFS should be make [load]-able
		AC_DEFINE([CVFS_MAKE_LOADABLE], [1], [Specify that the C-VFS should be able to be loaded])

		dnl Add appropriate dependencies
		EXTRA_KIT_DEPS="cvfs.tcl.h"
		EXTRA_VFS_OBJS="${EXTRA_VFS_OBJS} cvfs_data_tcl.o"
	]
)

AC_SUBST(EXTRA_KIT_DEPS)

dnl Put correct Makefile template in place
rm -f Makefile.in
cp Makefile.${TARGET}.in Makefile.in

dnl Produce output
AC_OUTPUT(Makefile)
AC_OUTPUT(Makefile Makefile.common)