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CCS/TMS320C6713B: errors during rts6700.lib rebuild, "xlocale"

Part Number: TMS320C6713B

Tool/software: Code Composer Studio

Hello,

While compiling a project, a rebuild of the rts6700.lib was required.  It first complained about _acos(), which appears to be a long running linker issue not yet resolved.  And then it goes on to fail on a lot of the library constituent file, mentioning "xlocale", as shown below.  Any clues as to the cause, and fix?

Thanks,

Robert

<Linking>
warning #10366-D: automatic library build: using library "C:\ti\lib\rts6700.lib" for the first time, so it must be built. This may take a few minutes.
error: function _acos in file acos.c : invalid instruction schedule generated;
try reducing speed optimization levels
"c:/ti/lib/src/xiosbase", line 4: fatal error: could not open source file "xlocale"

1 fatal error detected in the compilation of "iomanip.cpp".
>> Compilation failure

>> Compilation failure

>> Compilation failure
Makefile:1220: recipe for target 'c:/users/1/appdata/local/temp/ti1704~1/obj/fiopen.obj' failed
Compilation terminated.
"c:/ti/lib/src/xiosbase", line 4: fatal error: could not open source file "xlocale"
1 fatal error detected in the compilation of "iostream.cpp".
Compilation terminated.
"c:/ti/lib/src/xiosbase", line 4: fatal error: could not open source file "xlocale"
1 fatal error detected in the compilation of "fiopen.cpp".
Compilation terminated.
gmake.exe[2]: *** [c:/users/1/appdata/local/temp/ti1704~1/obj/fiopen.obj] Error 1
gmake.exe[2]: *** [c:/users/1/appdata/local/temp/ti1704~1/obj/iomanip.obj] Error 1
"c:/ti/lib/src/xiosbase", line 4: fatal error: could not open source file "xlocale"