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Hey Lang,

I can’t remember anymore but I think I haven’t tried with -femulated-tls.

I also forwarded the question to the Cling people because I think they got it running – but also haven’t heard back from there. I decided against emulated-tls and tried resolving the Windows symbols myself by adding another IR file to it which was compiled as the following:
extern "C"

{

void Sleep(unsigned long dwMilliseconds);

static constexpr int EpochStart = std::numeric\_limits<int>::min();

unsigned int \_tls\_index = 0;

int \_Init\_global\_epoch = EpochStart;

int \_Init\_thread\_epoch = EpochStart;

void \_Init\_thread\_header(volatile int\* ptss)

{

while(true)

{

/\* Try to acquire the first initialization lock \*/

int oldTss = \_InterlockedCompareExchange(reinterpret\_cast<volatile long\*>(ptss), \-1, 0);

if(oldTss == -1)

{

/\* Busy, wait for the other thread to do the initialization \*/

Sleep(0);

continue;

}

/\* Either we acquired the lock and the caller will do the initializaion

or the initialization is complete and the caller will skip it \*/

break;

}

}

void \_Init\_thread\_footer(int \*ptss)

{

\*ptss \= \_InterlockedIncrement(reinterpret\_cast<long\*>(&\_Init\_global\_epoch));

}

void \_Init\_thread\_abort(volatile int\* ptss)

{

/\* Abort the initialization \*/

\_InterlockedAnd(reinterpret\_cast<volatile long\*>(ptss), 0);

}

}

This was good enough for me until I hear a better way to do this – cause I got a feel that this is not really working? However my static variables were only initialized once no matter how many threads I threw at.

I haven’t mentioned that solution yet cause I’m not much confident about it’s reliability. Maybe I should show this to the cling people too…

Kind greetings

Björn