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Description of problem: With the -ftls-model=global-dynamic option, a __thread variable access in non-PIC code still gets an initial-exec code sequence. With __attribute__ ((tls_model ("global-dynamic"))) it correctly produces the global-dynamic sequence. Version-Release number of selected component (if applicable): gcc-4.6.0-9.fc15.x86_64 How reproducible: 100% Steps to Reproduce: 1. echo > a.c 'extern __thread int errno; int main (void) { return errno; }' echo > b.c 'extern __thread int errno __attribute__((tls_model ("global-dynamic")));; int main (void) { return errno; }' 2. gcc -c -O3 -S -o - a.c -ftls-model=global-dynamic 3. gcc -c -O3 -S -o - b.c Actual results: a.c: movq errno@gottpoff(%rip), %rax movl %fs:(%rax), %eax b.c: leaq errno@tlsgd(%rip), %rdi .value 0x6666 rex64 call __tls_get_addr movl (%rax), %eax Expected results: Same access sequence for a.c and b.c Additional info: Equivalent bug for both i386 and x86_64 code generation. I didn't test other platforms. Yes, the linker will probably rewrite the sequence to IE anyway. But that's my business, I used -ftls-model=... because I meant it.
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