Misc threading related compilation fixes

* Without threading enabled
* On archs without known way to emit ELF thread pointers (ARMv6, power)

  Fix #24051

src/julia_threads.h

@@ -81,7 +81,7 @@ typedef struct {
 
 // This includes all the thread local states we care about for a thread.
 #define JL_MAX_BT_SIZE 80000
-typedef struct _jl_tls_states_t {
+struct _jl_tls_states_t {
     struct _jl_gcframe_t *pgcstack;
     size_t world_age;
     struct _jl_value_t *exception_in_transit;
@@ -130,7 +130,7 @@ typedef struct _jl_tls_states_t {
     int finalizers_inhibited;
     arraylist_t finalizers;
     jl_gc_mark_cache_t gc_cache;
-} jl_tls_states_t;
+};
 
 // Update codegen version in `ccall.cpp` after changing either `pause` or `wake`
 #ifdef __MIC__

src/llvm-ptls.cpp

@@ -136,6 +136,7 @@ static Instruction *emit_ptls_tp(LLVMContext &ctx, Value *offset, Type *T_ppjlva
 #elif defined(_CPU_X86_)
     const char *asm_str = "movl %gs:0, $0";
 #else
+    const char *asm_str = nullptr;
     assert(0 && "Cannot emit thread pointer for this architecture.");
 #endif
     if (!offset) {

src/tls.h

@@ -16,7 +16,9 @@ static inline unsigned long JL_CONST_FUNC jl_thread_self(void)
 #endif
 }
 
-typedef struct _jl_tls_states_t *jl_ptls_t;
+typedef struct _jl_tls_states_t jl_tls_states_t;
+
+typedef jl_tls_states_t *jl_ptls_t;
 
 #ifdef __cplusplus
 extern "C" {