[compiler-rt] [scudo] Do not define some entrypoints on Fuchsia (PR #191826)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Fabio D'Urso (fabio-d)

<details>
<summary>Changes</summary>

These entrypoints were defined separately in wrappers_c_bionic.cpp (which Fuchsia did not include in the build) before #<!-- -->190857 and, therefore, were not exposed to Fuchsia's Scudo clients.

With #<!-- -->190857, they have been merged into the main wrappers_c.cpp file, removing this separation.

This commit makes them conditionally-defined to not be building for Fuchsia, to restore the pre-#<!-- -->190857 ABI.

---
Full diff: https://github.com/llvm/llvm-project/pull/191826.diff


1 Files Affected:

- (modified) compiler-rt/lib/scudo/standalone/wrappers_c.cpp (+2) 


``````````diff
diff --git a/compiler-rt/lib/scudo/standalone/wrappers_c.cpp b/compiler-rt/lib/scudo/standalone/wrappers_c.cpp
index b8842f36e6fd6..573f0b7cda60f 100644
--- a/compiler-rt/lib/scudo/standalone/wrappers_c.cpp
+++ b/compiler-rt/lib/scudo/standalone/wrappers_c.cpp
@@ -425,6 +425,7 @@ SCUDO_PREFIX(malloc_set_add_large_allocation_slack)(int add_slack) {
 // Extra Internal functions.
 INTERFACE void __scudo_print_stats(void) { Allocator.printStats(); }
 
+#if !SCUDO_FUCHSIA
 INTERFACE void __scudo_get_error_info(
     struct scudo_error_info *error_info, uintptr_t fault_addr,
     const char *stack_depot, size_t stack_depot_size, const char *region_info,
@@ -458,5 +459,6 @@ INTERFACE const char *__scudo_get_ring_buffer_addr() {
 INTERFACE size_t __scudo_get_ring_buffer_size() {
   return Allocator.getRingBufferSize();
 }
+#endif
 
 } // extern "C"

``````````

</details>


https://github.com/llvm/llvm-project/pull/191826