Mark function used by asm block as used, otherwise optimizer may not see the use and may delete the function.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53692 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index 1497dd6..9750579 100644
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -23,6 +23,11 @@
#define VISIBILITY_HIDDEN
#endif
+#if (__GNUC__ >= 4)
+#define ATTRIBUTE_USED __attribute__((__used__))
+#else
+#define ATTRIBUTE_USED
+#endif
// C++ doesn't support 'extern template' of template specializations. GCC does,
// but requires __extension__ before it. In the header, use this:
diff --git a/lib/Target/X86/X86JITInfo.cpp b/lib/Target/X86/X86JITInfo.cpp
index 0cda7d3..f7d1118 100644
--- a/lib/Target/X86/X86JITInfo.cpp
+++ b/lib/Target/X86/X86JITInfo.cpp
@@ -18,6 +18,7 @@
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/Config/alloca.h"
+#include "llvm/Support/Compiler.h"
#include <cstdlib>
#include <cstring>
using namespace llvm;
@@ -315,7 +316,8 @@
/// function stub when we did not know the real target of a call. This function
/// must locate the start of the stub or call site and pass it into the JIT
/// compiler function.
-extern "C" void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
+extern "C" void ATTRIBUTE_USED
+X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
intptr_t *RetAddrLoc = &StackPtr[1];
assert(*RetAddrLoc == RetAddr &&
"Could not find return address on the stack!");