Hi Paolo,
Paolo Bonzini wrote:
Both are same.
Ah, I see, the call is optimized out because __emutls_get_address is
const. You can try
__thread int a;
int main () {
return *(int *)__emutls_get_address ((void *)0) == a;
}
I don't have an emutls target at hand, but it does fail on Linux.
Which version of gcc did you use? gcc 4.1 (maybe and 4.2) will report
error. But gcc 4.3 compiles OK. I tested using x86_64 native gcc from
Debian unstable. __emutls_get_address is defined in libgcc even the
target has real TLS.
/usr/lib/gcc/x86_64-linux-gnu$ readelf -a ./4.3/libgcc_s.so | grep emutls
28: 0000000000013a80 390 FUNC GLOBAL DEFAULT 12
__emutls_get_address@@GCC_4.3.0
136: 0000000000013970 57 FUNC GLOBAL DEFAULT 12
__emutls_register_common@@GCC_4.3.0
Regards,
Jie
