First pass at Windows Tcl autoconf macros

FossilOrigin-Name: 80f11146d9efcbeb08429008cb8d74a4f4d509eb

1 files changed, 865 insertions, 0 deletions

diff --git a/win/tcl.m4 b/win/tcl.m4
new file mode 100644
index 0000000..c63da31
--- /dev/null
+++ b/win/tcl.m4
@@ -0,0 +1,865 @@
+#------------------------------------------------------------------------
+# SC_PATH_TCLCONFIG --
+#
+#	Locate the tclConfig.sh file and perform a sanity check on
+#	the Tcl compile flags
+#	Currently a no-op for Windows
+#
+# Arguments:
+#	none
+#
+# Results:
+#
+#	Adds the following arguments to configure:
+#		--with-tcl=...
+#
+#	Defines the following vars:
+#		TCLCONFIG	Full path to the tclConfig.sh file
+#------------------------------------------------------------------------
+
+AC_DEFUN(SC_PATH_TCLCONFIG, [
+])
+
+#------------------------------------------------------------------------
+# SC_PATH_TKCONFIG --
+#
+#	Locate the tkConfig.sh file
+#	Currently a no-op for Windows
+#
+# Arguments:
+#	none
+#
+# Results:
+#
+#	Adds the following arguments to configure:
+#		--with-tk=...
+#
+#	Defines the following vars:
+#		TKCONFIG	Full path to the tkConfig.sh file
+#------------------------------------------------------------------------
+
+AC_DEFUN(SC_PATH_TKCONFIG, [
+])
+
+#------------------------------------------------------------------------
+# SC_LOAD_TCLCONFIG --
+#
+#	Load the tclConfig.sh file
+#	Currently a no-op for Windows
+#
+# Arguments:
+#	
+#	Requires the following vars to be set:
+#		TCLCONFIG
+#
+# Results:
+#
+#	Subst's the following vars:
+#		TCL_CC
+#		TCL_DEFS
+#		TCL_CFLAGS
+#		TCL_DBGX
+#		TCL_LIBS
+#		TCL_SHLIB_LD
+#		SHLIB_SUFFIX
+#		TCL_LD_FLAGS
+#		TCL_BUILD_LIB_SPEC
+#		TCL_LIB_SPEC
+#		TCL_SHARED_LIB_SUFFIX
+#------------------------------------------------------------------------
+
+AC_DEFUN(SC_LOAD_TCLCONFIG, [
+])
+
+#------------------------------------------------------------------------
+# SC_LOAD_TKCONFIG --
+#
+#	Load the tkConfig.sh file
+#	Currently a no-op for Windows
+#
+# Arguments:
+#	
+#	Requires the following vars to be set:
+#		TKCONFIG
+#
+# Results:
+#
+#	Subst's the following vars:
+#		TK_VERSION
+#		TK_DEFS
+#		TK_DBGX
+#		TK_LIBS
+#		TK_XINCLUDES
+#		TK_XLIBSW
+#		TK_BUILD_LIB_SPEC
+#		TK_LIB_SPEC
+#------------------------------------------------------------------------
+
+AC_DEFUN(SC_LOAD_TKCONFIG, [
+])
+
+#------------------------------------------------------------------------
+# SC_ENABLE_GCC --
+#
+#	Allows the use of GCC if available
+#
+# Arguments:
+#	none
+#	
+# Results:
+#
+#	Adds the following arguments to configure:
+#		--enable-gcc
+#
+#	Defines the following vars:
+#		CC	Command to use for the compiler
+#------------------------------------------------------------------------
+
+AC_DEFUN(SC_ENABLE_GCC, [
+    AC_ARG_ENABLE(gcc, [  --enable-gcc            allow use of gcc if available [--disable-gcc]],
+	[ok=$enableval], [ok=no])
+    if test "$ok" = "yes"; then
+	CC=gcc
+    else
+	CC=cl
+    fi
+])
+
+#------------------------------------------------------------------------
+# SC_ENABLE_SHARED --
+#
+#	Allows the building of shared libraries
+#
+# Arguments:
+#	none
+#	
+# Results:
+#
+#	Adds the following arguments to configure:
+#		--enable-shared=yes|no
+#
+#	Defines the following vars:
+#		TCL_SHARED_BUILD	Value of 1 or 0
+#		STATIC_BUILD
+#------------------------------------------------------------------------
+
+AC_DEFUN(SC_ENABLE_SHARED, [
+    AC_ARG_ENABLE(shared,
+	[  --enable-shared         build and link with shared libraries [--enable-shared]],
+    [tcl_ok=$enableval], [tcl_ok=yes])
+
+    if test "${enable_shared+set}" = set; then
+    enableval="$enable_shared"
+    tcl_ok=$enableval
+    else
+    tcl_ok=yes
+    fi
+
+    if test "$tcl_ok" = "yes" ; then
+	TCL_SHARED_BUILD=1
+    else
+	TCL_SHARED_BUILD=0
+	AC_DEFINE(STATIC_BUILD)
+    fi
+
+])
+
+#------------------------------------------------------------------------
+# SC_ENABLE_THREADS --
+#
+#	Specify if thread support should be enabled
+#
+# Arguments:
+#	none
+#	
+# Results:
+#
+#	Adds the following arguments to configure:
+#		--enable-threads=yes|no
+#
+#	Defines the following vars:
+#		TCL_THREADS
+#
+#------------------------------------------------------------------------
+
+AC_DEFUN(SC_ENABLE_THREADS, [
+    AC_ARG_ENABLE(threads, [  --enable-threads        build with threads],
+	[tcl_ok=$enableval], [tcl_ok=no])
+    if test "$tcl_ok" = "yes"; then
+	AC_DEFINE(TCL_THREADS)
+	echo "building with threads enabled"
+    else
+	echo "building with threads disabled (default)"
+    fi
+])
+
+#------------------------------------------------------------------------
+# SC_ENABLE_SYMBOLS --
+#
+#	Specify if debugging symbols should be used
+#
+# Arguments:
+#	none
+#	
+#	Requires the following vars to be set:
+#		CFLAGS_DEBUG
+#		CFLAGS_OPTIMIZE
+#	
+# Results:
+#
+#	Adds the following arguments to configure:
+#		--enable-symbols
+#
+#	Defines the following vars:
+#		CFLAGS_DEFAULT	Sets to CFLAGS_DEBUG if true
+#				Sets to CFLAGS_OPTIMIZE if false
+#		LD_FLAGS_DEFAULT	Sets to LDFLAGS_DEBUG if true
+				Sets to LDFLAGS_OPTIMIZE if false
+#		DBGX		Debug library extension
+#
+#------------------------------------------------------------------------
+
+AC_DEFUN(SC_ENABLE_SYMBOLS, [
+    AC_ARG_ENABLE(symbols, [  --enable-symbols        build with debugging symbols [--disable-symbols]],    [tcl_ok=$enableval], [tcl_ok=no])
+
+    if test "$tcl_ok" = "yes"; then
+	CFLAGS_DEFAULT='${CFLAGS_DEBUG}'
+	LD_FLAGS_DEFAULT='${LDFLAGS_DEBUG}'
+	DBGX=d
+	echo "building with debug symbols"
+    else
+	CFLAGS_DEFAULT='${CFLAGS_OPTIMIZE}'
+	LD_FLAGS_DEFAULT='${LDFLAGS_OPTIMIZE}'
+	DBGX=""
+	echo "building without debug symbols"
+    fi
+])
+
+
+#--------------------------------------------------------------------
+# SC_TCL_CONFIG_CFLAGS
+#
+#	Try to determine the proper flags to pass to the compiler
+#	for building shared libraries and other such nonsense.
+#
+# Arguments:
+#	none
+#
+# Results:
+#
+#	Defines the following vars:
+#
+#       DL_OBJS -       Name of the object file that implements dynamic
+#                       loading for Tcl on this system.
+#       DL_LIBS -       Library file(s) to include in tclsh and other base
+#                       applications in order for the "load" command to work.
+#       LD_FLAGS -      Flags to pass to the compiler when linking object
+#                       files into an executable application binary such
+#                       as tclsh.
+#       LD_SEARCH_FLAGS-Flags to pass to ld, such as "-R /usr/local/tcl/lib",
+#                       that tell the run-time dynamic linker where to look
+#                       for shared libraries such as libtcl.so.  Depends on
+#                       the variable LIB_RUNTIME_DIR in the Makefile.
+#       MAKE_LIB -      Command to execute to build the Tcl library;
+#                       differs depending on whether or not Tcl is being
+#                       compiled as a shared library.
+#       SHLIB_CFLAGS -  Flags to pass to cc when compiling the components
+#                       of a shared library (may request position-independent
+#                       code, among other things).
+#       SHLIB_LD -      Base command to use for combining object files
+#                       into a shared library.
+#       SHLIB_LD_LIBS - Dependent libraries for the linker to scan when
+#                       creating shared libraries.  This symbol typically
+#                       goes at the end of the "ld" commands that build
+#                       shared libraries. The value of the symbol is
+#                       "${LIBS}" if all of the dependent libraries should
+#                       be specified when creating a shared library.  If
+#                       dependent libraries should not be specified (as on
+#                       SunOS 4.x, where they cause the link to fail, or in
+#                       general if Tcl and Tk aren't themselves shared
+#                       libraries), then this symbol has an empty string
+#                       as its value.
+#       SHLIB_SUFFIX -  Suffix to use for the names of dynamically loadable
+#                       extensions.  An empty string means we don't know how
+#                       to use shared libraries on this platform.
+#       TCL_LIB_FILE -  Name of the file that contains the Tcl library, such
+#                       as libtcl7.8.so or libtcl7.8.a.
+#       TCL_LIB_SUFFIX -Specifies everything that comes after the "libtcl"
+#                       in the shared library name, using the $VERSION variable
+#                       to put the version in the right place.  This is used
+#                       by platforms that need non-standard library names.
+#                       Examples:  ${VERSION}.so.1.1 on NetBSD, since it needs
+#                       to have a version after the .so, and ${VERSION}.a
+#                       on AIX, since the Tcl shared library needs to have
+#                       a .a extension whereas shared objects for loadable
+#                       extensions have a .so extension.  Defaults to
+#                       ${VERSION}${SHLIB_SUFFIX}.
+#       TCL_NEEDS_EXP_FILE -
+#                       1 means that an export file is needed to link to a
+#                       shared library.
+#       TCL_EXP_FILE -  The name of the installed export / import file which
+#                       should be used to link to the Tcl shared library.
+#                       Empty if Tcl is unshared.
+#       TCL_BUILD_EXP_FILE -
+#                       The name of the built export / import file which
+#                       should be used to link to the Tcl shared library.
+#                       Empty if Tcl is unshared.
+#	CFLAGS_DEBUG -
+#			Flags used when running the compiler in debug mode
+#	CFLAGS_OPTIMIZE -
+#			Flags used when running the compiler in optimize mode
+#--------------------------------------------------------------------
+
+AC_DEFUN(SC_TCL_CONFIG_CFLAGS, [
+
+    # Step 1: set the variable "system" to hold the name and version number
+    # for the system.  This can usually be done via the "uname" command, but
+    # there are a few systems, like Next, where this doesn't work.
+
+    AC_MSG_CHECKING([system version (for dynamic loading)])
+    if test -f /usr/lib/NextStep/software_version; then
+	system=NEXTSTEP-`awk '/3/,/3/' /usr/lib/NextStep/software_version`
+    else
+	system=`uname -s`-`uname -r`
+	if test "$?" -ne 0 ; then
+	    AC_MSG_RESULT([unknown (can't find uname command)])
+	    system=unknown
+	else
+	    # Special check for weird MP-RAS system (uname returns weird
+	    # results, and the version is kept in special file).
+	
+	    if test -r /etc/.relid -a "X`uname -n`" = "X`uname -s`" ; then
+		system=MP-RAS-`awk '{print $3}' /etc/.relid'`
+	    fi
+	    if test "`uname -s`" = "AIX" ; then
+		system=AIX-`uname -v`.`uname -r`
+	    fi
+	    AC_MSG_RESULT($system)
+	fi
+    fi
+
+    # Step 2: check for existence of -ldl library.  This is needed because
+    # Linux can use either -ldl or -ldld for dynamic loading.
+
+    AC_CHECK_LIB(dl, dlopen, have_dl=yes, have_dl=no)
+
+    # Step 3: set configuration options based on system name and version.
+
+    do64bit_ok=no
+    fullSrcDir=`cd $srcdir; pwd`
+    EXTRA_CFLAGS=""
+    TCL_EXPORT_FILE_SUFFIX=""
+    TCL_UNSHARED_LIB_SUFFIX=""
+    TCL_TRIM_DOTS='`echo ${VERSION} | tr -d .`'
+    ECHO_VERSION='`echo ${VERSION}`'
+    TCL_LIB_VERSIONS_OK=ok
+    CFLAGS_DEBUG=-g
+    CFLAGS_OPTIMIZE=-O
+    TCL_NEEDS_EXP_FILE=0
+    TCL_BUILD_EXP_FILE=""
+    TCL_EXP_FILE=""
+    case $system in
+	AIX-4.[[2-9]])
+	    SHLIB_CFLAGS=""
+	    SHLIB_LD="$fullSrcDir/ldAix /bin/ld -bhalt:4 -bM:SRE -bE:lib.exp -H512 -T512 -bnoentry"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
+	    TCL_NEEDS_EXP_FILE=1
+	    TCL_EXPORT_FILE_SUFFIX='${VERSION}\$\{DBGX\}.exp'
+	    ;;
+	AIX-*)
+	    SHLIB_CFLAGS=""
+	    SHLIB_LD="$fullSrcDir/ldAix /bin/ld -bhalt:4 -bM:SRE -bE:lib.exp -H512 -T512"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    LIBOBJS="$LIBOBJS tclLoadAix.o"
+	    DL_LIBS="-lld"
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
+	    TCL_NEEDS_EXP_FILE=1
+	    TCL_EXPORT_FILE_SUFFIX='${VERSION}\$\{DBGX\}.exp'
+	    ;;
+	BSD/OS-2.1*|BSD/OS-3*)
+	    SHLIB_CFLAGS=""
+	    SHLIB_LD="shlicc -r"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	BSD/OS-4.*)
+	    SHLIB_CFLAGS="-export-dynamic -fPIC"
+	    SHLIB_LD="cc -shared"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS="-export-dynamic"
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	dgux*)
+	    SHLIB_CFLAGS="-K PIC"
+	    SHLIB_LD="cc -G"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	HP-UX-*.08.*|HP-UX-*.09.*|HP-UX-*.10.*|HP-UX-*.11.*)
+	    SHLIB_SUFFIX=".sl"
+	    AC_CHECK_LIB(dld, shl_load, tcl_ok=yes, tcl_ok=no)
+	    if test "$tcl_ok" = yes; then
+		SHLIB_CFLAGS="+z"
+		SHLIB_LD="ld -b"
+		SHLIB_LD_LIBS=""
+		DL_OBJS="tclLoadShl.o"
+		DL_LIBS="-ldld"
+		LD_FLAGS="-Wl,-E"
+		LD_SEARCH_FLAGS='-Wl,+s,+b,${LIB_RUNTIME_DIR}:.'
+	    fi
+	    ;;
+	IRIX-4.*)
+	    SHLIB_CFLAGS="-G 0"
+	    SHLIB_SUFFIX=".a"
+	    SHLIB_LD="echo tclLdAout $CC \{$SHLIB_CFLAGS\} | `pwd`/tclsh -r -G 0"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    DL_OBJS="tclLoadAout.o"
+	    DL_LIBS=""
+	    LD_FLAGS="-Wl,-D,08000000"
+	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
+	    TCL_SHARED_LIB_SUFFIX='${VERSION}\$\{DBGX\}.a'
+	    ;;
+	IRIX-5.*|IRIX-6.*|IRIX64-6.5*)
+	    SHLIB_CFLAGS=""
+	    SHLIB_LD="ld -n32 -shared -rdata_shared"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS=""
+	    LD_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
+	    if test "$CC" = "gcc" -o `$CC -v 2>&1 | grep -c gcc` != "0" ; then
+		EXTRA_CFLAGS="-mabi=n32"
+		LD_FLAGS="-mabi=n32"
+	    else
+		case $system in
+		    IRIX-6.3)
+			# Use to build 6.2 compatible binaries on 6.3.
+			EXTRA_CFLAGS="-n32 -D_OLD_TERMIOS"
+			;;
+		    *)
+			EXTRA_CFLAGS="-n32"
+			;;
+		esac
+		LD_FLAGS="-n32"
+	    fi
+	    ;;
+	IRIX64-6.*)
+	    SHLIB_CFLAGS=""
+	    SHLIB_LD="ld -32 -shared -rdata_shared"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS=""
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
+	    ;;
+	Linux*)
+	    SHLIB_CFLAGS="-fPIC"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    if test "$have_dl" = yes; then
+		SHLIB_LD="${CC} -shared"
+		DL_OBJS="tclLoadDl.o"
+		DL_LIBS="-ldl"
+		LD_FLAGS="-rdynamic"
+		LD_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
+	    else
+		AC_CHECK_HEADER(dld.h, [
+		    SHLIB_LD="ld -shared"
+		    DL_OBJS="tclLoadDld.o"
+		    DL_LIBS="-ldld"
+		    LD_FLAGS=""
+		    LD_SEARCH_FLAGS=""])
+	    fi
+	    ;;
+	MP-RAS-02*)
+	    SHLIB_CFLAGS="-K PIC"
+	    SHLIB_LD="cc -G"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	MP-RAS-*)
+	    SHLIB_CFLAGS="-K PIC"
+	    SHLIB_LD="cc -G"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS="-Wl,-Bexport"
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	NetBSD-*|FreeBSD-[[12]].*|OpenBSD-*)
+	    # Not available on all versions:  check for include file.
+	    AC_CHECK_HEADER(dlfcn.h, [
+		SHLIB_CFLAGS="-fpic"
+		SHLIB_LD="ld -Bshareable -x"
+		SHLIB_LD_LIBS=""
+		SHLIB_SUFFIX=".so"
+		DL_OBJS="tclLoadDl.o"
+		DL_LIBS=""
+		LD_FLAGS=""
+		LD_SEARCH_FLAGS=""
+		TCL_SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.so.1.0'
+	    ], [
+		SHLIB_CFLAGS=""
+		SHLIB_LD="echo tclLdAout $CC \{$SHLIB_CFLAGS\} | `pwd`/tclsh -r"
+		SHLIB_LD_LIBS='${LIBS}'
+		SHLIB_SUFFIX=".a"
+		DL_OBJS="tclLoadAout.o"
+		DL_LIBS=""
+		LD_FLAGS=""
+		LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
+		TCL_SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.a'
+	    ])
+
+	    # FreeBSD doesn't handle version numbers with dots.
+
+	    TCL_UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.a'
+	    TCL_LIB_VERSIONS_OK=nodots
+	    ;;
+	FreeBSD-*)
+	    # FreeBSD 3.* and greater have ELF.
+	    SHLIB_CFLAGS="-fpic"
+	    SHLIB_LD="ld -Bshareable -x"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS=""
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	NEXTSTEP-*)
+	    SHLIB_CFLAGS=""
+	    SHLIB_LD="cc -nostdlib -r"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadNext.o"
+	    DL_LIBS=""
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	OS/390-*)
+	    CFLAGS_OPTIMIZE=""      # Optimizer is buggy
+	    AC_DEFINE(_OE_SOCKETS)  # needed in sys/socket.h
+	    ;;      
+	OSF1-1.0|OSF1-1.1|OSF1-1.2)
+	    # OSF/1 1.[012] from OSF, and derivatives, including Paragon OSF/1
+	    SHLIB_CFLAGS=""
+	    # Hack: make package name same as library name
+	    SHLIB_LD='ld -R -export $@:'
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadOSF.o"
+	    DL_LIBS=""
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	OSF1-1.*)
+	    # OSF/1 1.3 from OSF using ELF, and derivatives, including AD2
+	    SHLIB_CFLAGS="-fpic"
+	    SHLIB_LD="ld -shared"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS=""
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	OSF1-V*)
+	    # Digital OSF/1
+	    SHLIB_CFLAGS=""
+	    SHLIB_LD='ld -shared -expect_unresolved "*"'
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS=""
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS='-Wl,-rpath,${LIB_RUNTIME_DIR}'
+	    ;;
+	RISCos-*)
+	    SHLIB_CFLAGS="-G 0"
+	    SHLIB_LD="echo tclLdAout $CC \{$SHLIB_CFLAGS\} | `pwd`/tclsh -r -G 0"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".a"
+	    DL_OBJS="tclLoadAout.o"
+	    DL_LIBS=""
+	    LD_FLAGS="-Wl,-D,08000000"
+	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
+	    ;;
+	SCO_SV-3.2*)
+	    # Note, dlopen is available only on SCO 3.2.5 and greater.  However,
+	    # this test works, since "uname -s" was non-standard in 3.2.4 and
+	    # below.
+	    SHLIB_CFLAGS="-Kpic -belf"
+	    SHLIB_LD="ld -G"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS=""
+	    LD_FLAGS="-belf -Wl,-Bexport"
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	SINIX*5.4*)
+	    SHLIB_CFLAGS="-K PIC"
+	    SHLIB_LD="cc -G"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS=""
+	    ;;
+	SunOS-4*)
+	    SHLIB_CFLAGS="-PIC"
+	    SHLIB_LD="ld"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
+
+	    # SunOS can't handle version numbers with dots in them in library
+	    # specs, like -ltcl7.5, so use -ltcl75 instead.  Also, it
+	    # requires an extra version number at the end of .so file names.
+	    # So, the library has to have a name like libtcl75.so.1.0
+
+	    TCL_SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.so.1.0'
+	    TCL_UNSHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}\$\{DBGX\}.a'
+	    TCL_LIB_VERSIONS_OK=nodots
+	    ;;
+	SunOS-5.[[0-6]]*)
+	    SHLIB_CFLAGS="-KPIC"
+	    SHLIB_LD="/usr/ccs/bin/ld -G -z text"
+
+	    # Note: need the LIBS below, otherwise Tk won't find Tcl's
+	    # symbols when dynamically loaded into tclsh.
+
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    LD_FLAGS=""
+	    LD_SEARCH_FLAGS='-Wl,-R,${LIB_RUNTIME_DIR}'
+	    ;;
+	SunOS-5*)
+	    SHLIB_CFLAGS="-KPIC"
+	    SHLIB_LD="/usr/ccs/bin/ld -G -z text"
+	    LD_FLAGS=""
+    
+	    do64bit_ok=no
+	    if test "$do64bit" = "yes" ; then
+	    arch=`isainfo`
+	    if test "$arch" = "sparcv9 sparc" ; then
+		if test "$CC" != "gcc" -a `$CC -v 2>&1 | grep -c gcc` = "0" ; then
+		do64bit_ok=yes
+		EXTRA_CFLAGS="-xarch=v9"
+		LD_FLAGS="-xarch=v9"
+		else 
+		AC_MSG_WARN("64bit mode not supported using GCC on $system")
+		fi
+	    else
+		AC_MSG_WARN("64bit mode only supported sparcv9 system")
+	    fi
+	    fi
+	    
+	    # Note: need the LIBS below, otherwise Tk won't find Tcl's
+	    # symbols when dynamically loaded into tclsh.
+
+	    SHLIB_LD_LIBS='${LIBS}'
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    if test "$CC" = "gcc" -o `$CC -v 2>&1 | grep -c gcc` != "0" ; then
+		LD_SEARCH_FLAGS='-Wl,-R,${LIB_RUNTIME_DIR}'
+	    else
+		LD_SEARCH_FLAGS='-R ${LIB_RUNTIME_DIR}'
+	    fi
+	    ;;
+	ULTRIX-4.*)
+	    SHLIB_CFLAGS="-G 0"
+	    SHLIB_SUFFIX=".a"
+	    SHLIB_LD="echo tclLdAout $CC \{$SHLIB_CFLAGS\} | `pwd`/tclsh -r -G 0"
+	    SHLIB_LD_LIBS='${LIBS}'
+	    DL_OBJS="tclLoadAout.o"
+	    DL_LIBS=""
+	    LD_FLAGS="-Wl,-D,08000000"
+	    LD_SEARCH_FLAGS='-L${LIB_RUNTIME_DIR}'
+	    ;;
+	UNIX_SV* | UnixWare-5*)
+	    SHLIB_CFLAGS="-KPIC"
+	    SHLIB_LD="cc -G"
+	    SHLIB_LD_LIBS=""
+	    SHLIB_SUFFIX=".so"
+	    DL_OBJS="tclLoadDl.o"
+	    DL_LIBS="-ldl"
+	    # Some UNIX_SV* systems (unixware 1.1.2 for example) have linkers
+	    # that don't grok the -Bexport option.  Test that it does.
+	    hold_ldflags=$LDFLAGS
+	    AC_MSG_CHECKING(for ld accepts -Bexport flag)
+	    LDFLAGS="${LDFLAGS} -Wl,-Bexport"
+	    AC_TRY_LINK(, [int i;], found=yes, found=no)
+	    LDFLAGS=$hold_ldflags
+	    AC_MSG_RESULT($found)
+	    if test $found = yes; then
+	    LD_FLAGS="-Wl,-Bexport"
+	    else
+	    LD_FLAGS=""
+	    fi
+	    LD_SEARCH_FLAGS=""
+	    ;;
+    esac
+
+    if test "$do64bit" = "yes" -a "$do64bit_ok" = "no" ; then
+    AC_MSG_WARN("64bit support being disabled -- not supported on this platform")
+    fi
+
+    # Step 4: If pseudo-static linking is in use (see K. B. Kenny, "Dynamic
+    # Loading for Tcl -- What Became of It?".  Proc. 2nd Tcl/Tk Workshop,
+    # New Orleans, LA, Computerized Processes Unlimited, 1994), then we need
+    # to determine which of several header files defines the a.out file
+    # format (a.out.h, sys/exec.h, or sys/exec_aout.h).  At present, we
+    # support only a file format that is more or less version-7-compatible. 
+    # In particular,
+    #	- a.out files must begin with `struct exec'.
+    #	- the N_TXTOFF on the `struct exec' must compute the seek address
+    #	  of the text segment
+    #	- The `struct exec' must contain a_magic, a_text, a_data, a_bss
+    #	  and a_entry fields.
+    # The following compilation should succeed if and only if either sys/exec.h
+    # or a.out.h is usable for the purpose.
+    #
+    # Note that the modified COFF format used on MIPS Ultrix 4.x is usable; the
+    # `struct exec' includes a second header that contains information that
+    # duplicates the v7 fields that are needed.
+
+    if test "x$DL_OBJS" = "xtclLoadAout.o" ; then
+	AC_MSG_CHECKING(sys/exec.h)
+	AC_TRY_COMPILE([#include <sys/exec.h>],[
+	    struct exec foo;
+	    unsigned long seek;
+	    int flag;
+#if defined(__mips) || defined(mips)
+	    seek = N_TXTOFF (foo.ex_f, foo.ex_o);
+#else
+	    seek = N_TXTOFF (foo);
+#endif
+	    flag = (foo.a_magic == OMAGIC);
+	    return foo.a_text + foo.a_data + foo.a_bss + foo.a_entry;
+    ], tcl_ok=usable, tcl_ok=unusable)
+	AC_MSG_RESULT($tcl_ok)
+	if test $tcl_ok = usable; then
+	    AC_DEFINE(USE_SYS_EXEC_H)
+	else
+	    AC_MSG_CHECKING(a.out.h)
+	    AC_TRY_COMPILE([#include <a.out.h>],[
+		struct exec foo;
+		unsigned long seek;
+		int flag;
+#if defined(__mips) || defined(mips)
+		seek = N_TXTOFF (foo.ex_f, foo.ex_o);
+#else
+		seek = N_TXTOFF (foo);
+#endif
+		flag = (foo.a_magic == OMAGIC);
+		return foo.a_text + foo.a_data + foo.a_bss + foo.a_entry;
+	    ], tcl_ok=usable, tcl_ok=unusable)
+	    AC_MSG_RESULT($tcl_ok)
+	    if test $tcl_ok = usable; then
+		AC_DEFINE(USE_A_OUT_H)
+	    else
+		AC_MSG_CHECKING(sys/exec_aout.h)
+		AC_TRY_COMPILE([#include <sys/exec_aout.h>],[
+		    struct exec foo;
+		    unsigned long seek;
+		    int flag;
+#if defined(__mips) || defined(mips)
+		    seek = N_TXTOFF (foo.ex_f, foo.ex_o);
+#else
+		    seek = N_TXTOFF (foo);
+#endif
+		    flag = (foo.a_midmag == OMAGIC);
+		    return foo.a_text + foo.a_data + foo.a_bss + foo.a_entry;
+		], tcl_ok=usable, tcl_ok=unusable)
+		AC_MSG_RESULT($tcl_ok)
+		if test $tcl_ok = usable; then
+		    AC_DEFINE(USE_SYS_EXEC_AOUT_H)
+		else
+		    DL_OBJS=""
+		fi
+	    fi
+	fi
+    fi
+
+    # Step 5: disable dynamic loading if requested via a command-line switch.
+
+    AC_ARG_ENABLE(load, [  --disable-load          disallow dynamic loading and "load" command],
+	[tcl_ok=$enableval], [tcl_ok=yes])
+    if test "$tcl_ok" = "no"; then
+	DL_OBJS=""
+    fi
+
+    if test "x$DL_OBJS" != "x" ; then
+	BUILD_DLTEST="\$(DLTEST_TARGETS)"
+    else
+	echo "Can't figure out how to do dynamic loading or shared libraries"
+	echo "on this system."
+	SHLIB_CFLAGS=""
+	SHLIB_LD=""
+	SHLIB_SUFFIX=""
+	DL_OBJS="tclLoadNone.o"
+	DL_LIBS=""
+	LD_FLAGS=""
+	LD_SEARCH_FLAGS=""
+	BUILD_DLTEST=""
+    fi
+
+    # If we're running gcc, then change the C flags for compiling shared
+    # libraries to the right flags for gcc, instead of those for the
+    # standard manufacturer compiler.
+
+    if test "$DL_OBJS" != "tclLoadNone.o" ; then
+	if test "$CC" = "gcc" -o `$CC -v 2>&1 | grep -c gcc` != "0" ; then
+	    case $system in
+		AIX-*)
+		    ;;
+		BSD/OS*)
+		    ;;
+		IRIX*)
+		    ;;
+		NetBSD-*|FreeBSD-*|OpenBSD-*)
+		    ;;
+		RISCos-*)
+		    ;;
+		ULTRIX-4.*)
+		    ;;
+		*)
+		    SHLIB_CFLAGS="-fPIC"
+		    ;;
+	    esac
+	fi
+    fi
+])