An issue with thread-local storage that could cause AVs on some Win64 machines has been resolved
We've just released a patch for C++Builder 10.3.3 that resolves:
This was caused by an error setting up the Win64 32-byte shadow space inside the assembly code to clean up TLS (thread-local storage) data, combined with the compiler applying a tail-call optimization to a method call (HeapFree) called within that, which meant that with the compiler optimization applied the effective caller of HeapFree was the code that incorrectly set up the shadow space. On some machines, possibly dependent on different Windows builds, HeapFree uses that shadow space, and so the TLS cleanup crashed. The patch correctly sets up the shadow space, and the crash no longer occurs.
The patch is available here: https://cc.embarcadero.com/item/30909 Full installation instructions are included in the readme.
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Downloaded the patch today, but cannot find a "Readme". In the past, some patches had very specific install requirements, so I'm not ready to just plow-ahead. Help locating the readme file would be appreciated. (don't see it anywhere in the .zip)
Hello. When you unzip the patch, you should see two files:
The second one is the patch itself. The first, a .md (Markdown, ie text format) file, is the readme.