TLS is disabled but a simple test shows that it works

[3246251196]

When we build our compilers, we use --disable-tls, but the test in: https://github.com/3246251196/adtools_testing/tree/main/tests/22_ThreadLocalStorage shows that - at least for that example - it works.

Investigate this.

@afxgroup Pinging.

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One thing I have noticed is the massive increase in time taken when a variable is allocated with __thread - compared to when it is not. This can be seen by running the test program versus when that variable is not per thread. This happens with both newlib and clib4. The example does iterate 1 billion times, so there is no doubt a lot of overhead of extra instructions etc. It is quite a contrived example.

[afxgroup]

IIRC TLS should be implemented on kernel side like MOS devs did. However if we can enable it we can find a way to optimize it in our clib4 at least