Move LLVM_ENABLE_ABI_BREAKING_CHECKS variables to their own file

so that you don't have to link Error.o and all of its dependencies.

In more detail: global initializers in Error.o can't be elided with
-ffunction-sections/-gc-sections since they always need to be run
causing a fairly significant binary bloat if all you want is the
ABI breaking checks code.

Differential Revision: https://reviews.llvm.org/D67387

llvm-svn: 371561

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/Support/ABIBreak.cpp b/llvm/lib/Support/ABIBreak.cpp
new file mode 100644
index 00000000000..247b635e02b
--- /dev/null
+++ b/llvm/lib/Support/ABIBreak.cpp
@@ -0,0 +1,24 @@
+//===----- lib/Support/ABIBreak.cpp - EnableABIBreakingChecks -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/abi-breaking.h"
+
+#ifndef _MSC_VER
+namespace llvm {
+
+// One of these two variables will be referenced by a symbol defined in
+// llvm-config.h. We provide a link-time (or load time for DSO) failure when
+// there is a mismatch in the build configuration of the API client and LLVM.
+#if LLVM_ENABLE_ABI_BREAKING_CHECKS
+int EnableABIBreakingChecks;
+#else
+int DisableABIBreakingChecks;
+#endif
+
+} // end namespace llvm
+#endif