Bug 21910 – Thread local variables hang the program in -betterC

In 64bit windows builds, reading/writing thread local variables hangs the program. Forum post about this: https://forum.dlang.org/post/[email protected] Steps to reproduce: - Compiler: dmd 2.096.1 - Platform: Windows 10 64-bit ``` // test.d int a; // thread local extern(C) void main() { printf("before... "); a = 42; // The program hangs here. printf("after"); } ``` ``` $ dmd -betterC test.d; ./test.exe before... after $ dmd -betterC -m64 test.d; ./test.exe before... [program hangs for 3 seconds and exits without printing anything else] ```

*** This issue has been marked as a duplicate of issue 20737 ***