Provide anchor for compiler extensions

This patch is cherry-picked from 04b0a4e22e3b4549f9d241f8a9f37eebecb62a31, and
amended to prevent an undefined reference to `llvm::EnableABIBreakingChecks'

diff --git a/llvm/lib/Extensions/Extensions.cpp b/llvm/lib/Extensions/Extensions.cpp
index e69de29..2fe537f 100644 (file)
--- a/llvm/lib/Extensions/Extensions.cpp
+++ b/llvm/lib/Extensions/Extensions.cpp
@@ -0,0 +1,15 @@
+#include "llvm/Passes/PassPlugin.h"
+#define HANDLE_EXTENSION(Ext)                                                  \
+               llvm::PassPluginLibraryInfo get##Ext##PluginInfo();
+#include "llvm/Support/Extension.def"
+
+
+namespace llvm {
+       namespace details {
+               void extensions_anchor() {
+#define HANDLE_EXTENSION(Ext)                                                  \
+                       static auto Ext = get##Ext##PluginInfo();
+#include "llvm/Support/Extension.def"
+               }
+       }
+}

diff --git a/llvm/lib/Extensions/LLVMBuild.txt b/llvm/lib/Extensions/LLVMBuild.txt
index 2005830..7a98c8f 100644 (file)
--- a/llvm/lib/Extensions/LLVMBuild.txt
+++ b/llvm/lib/Extensions/LLVMBuild.txt
@@ -18,4 +18,4 @@
 type = Library
 name = Extensions
 parent = Libraries
-required_libraries =
+required_libraries = Support