[libcxx] Disable invalid __start/__stop reference on NVPTX

jhuber6 · jhuber6 · commit 9497ab05b1ca · 2024-08-02T15:30:17.000-05:00
Summary:
The logic for this `__is_function_overridden` check requires accessing a
runtime array normally created by the linker. The NVPTX target is an
`__ELF__` target, however it does not support emitting the
`__start/__stop` symbols for C-identifier named sections. This needs to
be disabled explicitly so that the user can compile this with anything.
diff --git a/libcxx/src/include/overridable_function.h b/libcxx/src/include/overridable_function.h
@@ -96,7 +96,7 @@ _LIBCPP_HIDE_FROM_ABI bool __is_function_overridden(_Ret (*__fptr)(_Args...)) no
 }
 _LIBCPP_END_NAMESPACE_STD
 
-#elif defined(_LIBCPP_OBJECT_FORMAT_ELF)
+#elif defined(_LIBCPP_OBJECT_FORMAT_ELF) && !defined(__NVPTX__)
 
 #  define _LIBCPP_CAN_DETECT_OVERRIDDEN_FUNCTION 1
 #  define _LIBCPP_MAKE_OVERRIDABLE_FUNCTION_DETECTABLE __attribute__((__section__("__lcxx_override")))

Original file line number	Diff line number	Diff line change
`@@ -96,7 +96,7 @@ _LIBCPP_HIDE_FROM_ABI bool __is_function_overridden(_Ret (*__fptr)(_Args...)) no`
`96`	`96`	`}`
`97`	`97`	`_LIBCPP_END_NAMESPACE_STD`
`98`	`98`
`99`		`-#elif defined(_LIBCPP_OBJECT_FORMAT_ELF)`
	`99`	`+#elif defined(_LIBCPP_OBJECT_FORMAT_ELF) && !defined(__NVPTX__)`
`100`	`100`
`101`	`101`	`# define _LIBCPP_CAN_DETECT_OVERRIDDEN_FUNCTION 1`
`102`	`102`	`# define _LIBCPP_MAKE_OVERRIDABLE_FUNCTION_DETECTABLE __attribute__((__section__("__lcxx_override")))`