[libc++] Remove some private symbols from the ABI (#121497)
These symbols are never referenced directly outside the dylib, so we can
make them hidden instead. They are still in the dylib since can be
referenced through the `memory_resource*`, but dynamic linkers don't
have to do any work to deduplicate them.
diff --git a/libcxx/src/memory_resource.cpp b/libcxx/src/memory_resource.cpp
index e1a9e1a..ec9565f 100644
--- a/libcxx/src/memory_resource.cpp
+++ b/libcxx/src/memory_resource.cpp
@@ -38,7 +38,7 @@
}
#endif
-class _LIBCPP_EXPORTED_FROM_ABI __new_delete_memory_resource_imp : public memory_resource {
+class _LIBCPP_HIDDEN __new_delete_memory_resource_imp : public memory_resource {
void* do_allocate(size_t bytes, size_t align) override {
#if _LIBCPP_HAS_ALIGNED_ALLOCATION
return std::__libcpp_allocate<std::byte>(__element_count(bytes), align);
@@ -63,7 +63,7 @@
// null_memory_resource()
-class _LIBCPP_EXPORTED_FROM_ABI __null_memory_resource_imp : public memory_resource {
+class _LIBCPP_HIDDEN __null_memory_resource_imp : public memory_resource {
void* do_allocate(size_t, size_t) override { __throw_bad_alloc(); }
void do_deallocate(void*, size_t, size_t) override {}
bool do_is_equal(const memory_resource& other) const noexcept override { return &other == this; }
