[clang] [clang][ssaf] Fix plugin crash on AIX by adding `SUPPORT_PLUGINS` to `clang-ssaf-format` (PR #192292)

[Aviral Goel via cfe-commits]

https://github.com/aviralg updated https://github.com/llvm/llvm-project/pull/192292

>From 484c49cc296792dd4a54298f034c181640091704 Mon Sep 17 00:00:00 2001
From: Aviral Goel <agoel26 at apple.com>
Date: Wed, 15 Apr 2026 09:42:39 -0700
Subject: [PATCH] [clang][ssaf] Fix plugin crash on AIX by adding
 `SUPPORT_PLUGINS` to `clang-ssaf-format`

This change fixes a crash when running the `with-plugin.test` lit tests on AIX.
The crash is caused by a missing `-Wl, -brtl` linker flag. Without this flag,
the dynamic linker cannot resolve symbols from the host executable when loading
shared libraries via `dlopen`. So when the plugin's static initializer runs and
tries to register into the `llvm::Registry` (calling
`getRegistryLinkListInstance` defined in the host via
`LLVM_INSTANTIATE_REGISTRY`), the symbol resolves to `null`, crashing the
process.

The fix is to use `SUPPORT_PLUGINS` flag in `add_llvm_executable`, like other
tools in llvm. For AIX, this flag adds `-Wl, -brtl` to enable runtime linking;
for Non-AIX platforms, it sets `LLVM_NO_DEAD_STRIP` to prevent the linker from
stripping symbols that plugins reference at load time.
---
 clang/tools/clang-ssaf-format/CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/clang/tools/clang-ssaf-format/CMakeLists.txt b/clang/tools/clang-ssaf-format/CMakeLists.txt
index 5551dce34fc85..33ce432be3f4a 100644
--- a/clang/tools/clang-ssaf-format/CMakeLists.txt
+++ b/clang/tools/clang-ssaf-format/CMakeLists.txt
@@ -3,8 +3,13 @@ set(LLVM_LINK_COMPONENTS
   Support
   )
 
+if(CLANG_PLUGIN_SUPPORT)
+  set(support_plugins SUPPORT_PLUGINS)
+endif()
+
 add_clang_tool(clang-ssaf-format
   SSAFFormat.cpp
+  ${support_plugins}
   )
 
 clang_target_link_libraries(clang-ssaf-format