commit d293417931d3a9d46799b42795988ca3b5cfd766
author serge-sans-paille <sguelton@redhat.com> Thu Jan 16 21:53:32 2020 +0100
committer serge-sans-paille <sguelton@redhat.com> Fri Jan 17 09:58:32 2020 +0100
tree d0ce0a904295d118950691328b9a665dd843646a
parent d437fba8ef626b6d8b7928540f630163a9b04021

Add __warn_memset_zero_len builtin as a workaround for glibc issue

Glibc issue: https://sourceware.org/bugzilla/show_bug.cgi?id=25399
The fix consist in considering the missing function as a builtin lowered to a nop.

Differential Revision: https://reviews.llvm.org/D72869

clang/lib/CodeGen/CGBuiltin.cpp

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 4decaa5..9986ea4 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -3222,6 +3222,8 @@
         Builder.CreateZExt(EmitSignBit(*this, EmitScalarExpr(E->getArg(0))),
                            ConvertType(E->getType())));
   }
+  case Builtin::BI__warn_memset_zero_len:
+    return RValue::getIgnored();
   case Builtin::BI__annotation: {
     // Re-encode each wide string to UTF8 and make an MDString.
     SmallVector<Metadata *, 1> Strings;