kit

kit
git clone https://git.ryansepassi.com/git/kit.git
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a.c (726B)

      1 /* Reference a thread-local symbol that is *not* a thread-local definition
      2  * in the linked image.  kit emits local-exec TLS only, so the symbol's
      3  * tp-relative offset must be known at link time -- which holds only for a
      4  * thread-local defined in this image.  Here `shared` resolves to b.c's
      5  * ordinary (non-TLS) global, so there is no valid TLS offset; the linker
      6  * must reject this rather than bake in a bogus tp-relative offset.
      7  *
      8  * (clang lowers this external __thread reference to initial-exec on a
      9  * non-PIC executable; kit's linker fills the IE GOT slot with the symbol's
     10  * local-exec tp-offset, which is where the mismatch surfaces.) */
     11 extern _Thread_local int shared;
     12 
     13 int test_main(void) { return shared; }