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This does not work. For x86_64 native gcc, the compiler output is+ AC_COMPILE_IFELSE([__thread int a; int b; int main() { return a = b; }], + [if grep __emutls_get_address conftest.$ac_objext >/dev/null ; then
grepping in a binary file is not portable. If this works it would be better:
AC_COMPILE_IFELSE([[__thread int a; int b; extern void __emutls_get_address(); int main() { __emutls_get_address(); return a = b; }]], [gcc_cv_use_emutls=yes], [gcc_cv_use_emutls=no])
Otherwise, the configury parts look fine to me.
Regards, Jie
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