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I built on the same machine without problems.

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really? I just tried again, same problem (on a fresh
checkout of the HEAD):

-------------------------------------------------------------------------------------------------

usf-cf-x86-freebsd-1 tcl $ ~/HEAD/tcl/unix/configure
--enable-threads

usf-cf-x86-freebsd-1 tcl $ make
lrm -f libtclstub8.4.a
ar cr libtclstub8.4.a tclStubLib.o ; ranlib libtclstub8.4.a
rm -f libtcl8.4.so
ld -Bshareable -x -o libtcl8.4.so regcomp.o regexec.o
regfree.o regerror.o tclAlloc.o tclAsync.o tclBasic.o
tclBinary.o tclCkalloc.o tclClock.o tclCmdAH.o tclCmdIL.o
tclCmdMZ.o tclCompCmds.o tclCompExpr.o tclCompile.o
tclDate.o tclEncoding.o tclEnv.o tclEvent.o tclExecute.o
tclFCmd.o tclFileName.o tclGet.o tclHash.o tclHistory.o
tclIndexObj.o tclInterp.o tclIO.o tclIOCmd.o tclIOGT.o
tclIOSock.o tclIOUtil.o tclLink.o tclListObj.o tclLiteral.o
tclLoad.o tclMain.o tclNamesp.o tclNotify.o tclObj.o
tclPanic.o tclParse.o tclParseExpr.o tclPipe.o tclPkg.o
tclPosixStr.o tclPreserve.o tclProc.o tclRegexp.o
tclResolve.o tclResult.o tclScan.o tclStringObj.o
tclThread.o tclThreadAlloc.o tclThreadJoin.o tclStubInit.o
tclStubLib.o tclTimer.o tclUtf.o tclUtil.o tclVar.o
tclUnixChan.o tclUnixEvent.o tclUnixFCmd.o tclUnixFile.o
tclUnixPipe.o tclUnixSock.o tclUnixTime.o tclUnixInit.o
tclUnixThrd.o tclUnixNotfy.o tclLoadDl.o -pthread -lm
-rpath /usr/local/lib
/usr/libexec/elf/ld: unrecognized option 'tclLoadDl.o'
/usr/libexec/elf/ld: use the --help option for usage information
*** Error code 1

Stop in
/home/users/d/da/das/build/usf-cf-x86-freebsd-1/HEAD/tcl.

-------------------------------------------------------------------------------------------------

if the -pthread in the ld line is removed, the link succeeds

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Yes, really ...

usf-cf-x86-freebsd-1 [~/build/freebsd/tcl84st] 7 % make shell
rm -f libtclstub8.4.a
ar cr libtclstub8.4.a tclStubLib.o ; ranlib libtclstub8.4.a
rm -f libtcl8.4.a
ar cr libtcl8.4.a regcomp.o regexec.o regfree.o regerror.o
tclAlloc.o tclAsync.o tclBasic.o tclBinary.o tclCkalloc.o
tclClock.o tclCmdAH.o tclCmdIL.o tclCmdMZ.o tclCompCmds.o
tclCompExpr.o tclCompile.o tclDate.o tclEncoding.o tclEnv.o
tclEvent.o tclExecute.o tclFCmd.o tclFileName.o tclGet.o
tclHash.o tclHistory.o tclIndexObj.o tclInterp.o tclIO.o
tclIOCmd.o tclIOGT.o tclIOSock.o tclIOUtil.o tclLink.o
tclListObj.o tclLiteral.o tclLoad.o tclMain.o tclNamesp.o
tclNotify.o tclObj.o tclPanic.o tclParse.o tclParseExpr.o
tclPipe.o tclPkg.o tclPosixStr.o tclPreserve.o tclProc.o
tclRegexp.o tclResolve.o tclResult.o tclScan.o
tclStringObj.o tclThread.o tclThreadAlloc.o tclThreadJoin.o
tclStubInit.o tclStubLib.o tclTimer.o tclUtf.o tclUtil.o
tclVar.o tclUnixChan.o tclUnixEvent.o tclUnixFCmd.o
tclUnixFile.o tclUnixPipe.o tclUnixSock.o tclUnixTime.o
tclUnixInit.o tclUnixThrd.o tclUnixNotfy.o tclLoadDl.o ;
ranlib libtcl8.4.a
gcc -pipe -export-dynamic -pthread tclAppInit.o
-L/home/users/h/ho/hobbs/build/freebsd/tcl84st -ltcl8.4
-pthread -lm -Wl,-rpath,/usr/local/lib -o tclsh
% parray tcl_platform
tcl_platform(byteOrder) = littleEndian
tcl_platform(machine) = i386
tcl_platform(os) = FreeBSD
tcl_platform(osVersion) = 4.6-STABLE
tcl_platform(platform) = unix
tcl_platform(threaded) = 1
tcl_platform(user) = hobbs
tcl_platform(wordSize) = 4

The question is likely about paths ... why do you have ld
-Bshareable, where I have ar and gcc? Works for me ...

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One build (the failing one) is dynamic, and one (the
succeeding one) is static. Why would this make a difference?

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that's a good point, indeed if I configure with
--disable-shared my build succeeds as well...

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OK, corrected this for FreeBSD to remove it in the FreeBSD
specific section with a sed macro. This was only needed on
dynamic builds.