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LLVM appears to generate R_X86_64_TPOFF32 relocations for accesses to thread-local variables, even when the large code model is enabled with the clang flag -mcmodel=large. This results in a linker error for programs that require >4GB thread-local data sections (.tdata and .tbss).
Compile as follows: clang -mcmodel=large test.c
Produces following error:
/tmp/user/20498/large-633e12.o: in function `main':
large.c:(.text+0xf): relocation truncated to fit: R_X86_64_TPOFF32 against symbol `buf' defined in .tbss section in /tmp/user/20498/large-633e12.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)