| Issue |
77128
|
| Summary |
LLVM uses R_X86_64_TPOFF32 relocations for large code model (-mcmodel=large), resulting in 'relocation truncated to fit' error
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
nmosier
|
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).
Here is an example program that fails to compile:
```c
#define BUFSIZE (1024UL * 1024UL * 1024UL * 5UL)
_Thread_local char buf[BUFSIZE];
int main() {
buf[BUFSIZE-1] = 0;
}
```
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)
```
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