[compiler-rt] [llvm] [compiler-rt] Hide dlvsym call behind appropriate guards (PR #191440)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

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

Author: google-yfyang

<details>
<summary>Changes</summary>

#<!-- -->191098 Add some unguarded dlvsym calls. This causes build issues when targeting certain platforms such as iOS.

This change should restore the original behavior.

---
Full diff: https://github.com/llvm/llvm-project/pull/191440.diff


1 Files Affected:

- (modified) compiler-rt/lib/interception/interception_linux.cpp (+2) 


``````````diff
diff --git a/compiler-rt/lib/interception/interception_linux.cpp b/compiler-rt/lib/interception/interception_linux.cpp
index f2c959d2d05c6..ff22022909597 100644
--- a/compiler-rt/lib/interception/interception_linux.cpp
+++ b/compiler-rt/lib/interception/interception_linux.cpp
@@ -54,11 +54,13 @@ void* LookupSymbolNext(const char* symbol) {
   return dlsym(RTLD_NEXT, symbol);
 }
 
+#if SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
 void* LookupSymbolNextVersioned(const char* symbol, const char* version) {
   if (!DynamicLoaderAvailable() || dlvsym == nullptr)
     return nullptr;
   return dlvsym(RTLD_NEXT, symbol, version);
 }
+#  endif  // SANITIZER_GLIBC || SANITIZER_FREEBSD || SANITIZER_NETBSD
 
 }  // namespace __interception
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/191440