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difference between tls.dat and dat files

Hi,

I have a question when configuring crosstool.

What are the different between the *-tls.dat files and *.dat files?

I noticed that in *-tls.dat files, there is an extra line says 
GLIBC_EXTRA_CONFIG="$GLIBC_EXTRA_CONFIG --with-tls --with-__thread  --enable-kernel=2.4.18"

Does it mean only *-tls.dat configurations support multi-threaded programs?

But when I run sh ./demo-alpha.sh with the tls.dat file, there is a line printed: 

GLIBC_EXTRA_CONFIG not set, so not passing any extra options to glibc's configure script

Does this simply mean the --with-__thread options in the tls.dat file is not used? If so, then again what is the difference between tls.dat and other dat files?

Thank you so much!

Jiayuan
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