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DSPLIB linking problem DSPF_sp_fftSPxSP unresolved symbols

I have a problem similar to http://e2e.ti.com/support/embedded/linux/f/354/t/148636.aspx but it seems to be a different cause.

I am porting code from another platform (Intel, using IPP), and have just started adding the DSPLIB equivalents with DSPF_sp_fftSPxSP

When I build, I get an unresolved symbol, I am building for Little-endian ELF format and have linked the .ae66 library.

Unlike the link above, the library is included after the code which calls it, I can't see what the problem might be.  I have confirmed with nm6x.exe that the linked file includes the function:

00006a8 t $C$L8
00000000 t .text
00000000 t .text:optimized
00000000 T DSPF_sp_fftSPxSP
00000000 a DSPF_sp_fftSPxSP.asm
00000000 u
000000e0 t $C$L3

I have included both the lib directory and the specific .ae66 file while trying to track down the problem. This is the output (long list of files trimmed, replaced by [...] ):

'Building target: benchmark.out'
'Invoking: C6000 Linker'
"C:/ti/ccsv5/tools/compiler/c6000_7.4.11/bin/cl6x" -mv6600 --abi=eabi -g --gcc --display_error_number --diag_warning=225 --diag_wrap=off -z -m"benchmark.map" -i"C:/ti/ccsv5/tools/compiler/c6000_7.4.11/lib" -i"C:/ti/dsplib_c66x_3_1_0_0/lib" -i"C:/ti/ccsv5/tools/compiler/c6000_7.4.11/include" --reread_libs --warn_sections --display_error_number --diag_wrap=off --rom_model -o "benchmark.out" -l"./configPkg/linker.cmd" [...] "./signal/signal_code.obj" [...] -l"C:\ti\dsplib_c66x_3_1_0_0\lib\dsplib.ae66" -l"libc.a"
<Linking>
warning #10247-D: creating output section ".TI.tls" without a SECTIONS specification
warning #10247-D: creating output section ".TI.tls_init" without a SECTIONS specification

 undefined                                                                        first referenced        
  symbol                                                                              in file             
 ---------                                                                        ----------------        
 DSPF_sp_fftSPxSP(int, float *, float *, float *, unsigned char *, int, int, int) ./signal/signal_code.obj

error #10234-D: unresolved symbols remain

>> Compilation failure
error #10010: errors encountered during linking; "benchmark.out" not built
gmake: *** [benchmark.out] Error 1
gmake: Target `all' not remade because of errors.

**** Build Finished ****

Can anyone suggest how to fix this?