[sanitizer] Move the errno/ENOMEM allocator checks logic to separate .cc

Summary:
The fact that `sanitizer_allocator_checks.h` is including `sanitizer_errno.h`
creates complications for future changes, where it would conflict with `errno.h`
definitions on Android and Fuchsia (macro redefinition).

By moving the portion that sets errno in the checks to a separate compilation
unit, we avoid the inclusion of the header there, which solves the issue.

Not that it is not vital to have that function in a header as it is called as a
result of an unlikely event, and doesn't need to be inlined.

Reviewers: alekseyshl

Reviewed By: alekseyshl

Subscribers: kubamracek, llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D38706

llvm-svn: 315319

1 files changed, 23 insertions, 0 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_allocator_checks.cc b/compiler-rt/lib/sanitizer_common/sanitizer_allocator_checks.cc
new file mode 100644
index 00000000000..dc263dbef5f
--- /dev/null
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_allocator_checks.cc
@@ -0,0 +1,23 @@
+//===-- sanitizer_allocator_checks.cc ---------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Various checks shared between ThreadSanitizer, MemorySanitizer, etc. memory
+// allocators.
+//
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_errno.h"
+
+namespace __sanitizer {
+
+void SetErrnoToENOMEM() {
+  errno = errno_ENOMEM;
+}
+
+} // namespace __sanitizer