[nolibc] Begin moving sanitizer_common's libc-dependent code to a separate library

Introduce a new object library, RTSanitizerCommonLibc, which will contain
the subset of sanitizer_common with libc dependencies. RTSanitizerCommon
contains the remainder of sanitizer_common, and is intended to have no
libc dependencies. Begin moving code to RTSanitizerCommonLibc, starting
with sanitizer_common.cc, whose libc-dependent portion is moved to
sanitizer_common_libcdep.cc, the first member of the new library.

This split affects the CMake build only.  The makefile build continues
to produce the full sanitizer_common library.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182118 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_common_libcdep.cc b/lib/sanitizer_common/sanitizer_common_libcdep.cc
new file mode 100644
index 000000000..36f6cf0bc
--- /dev/null
+++ b/lib/sanitizer_common/sanitizer_common_libcdep.cc
@@ -0,0 +1,23 @@
+//===-- sanitizer_common_libcdep.cc ---------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer
+// run-time libraries.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common.h"
+
+namespace __sanitizer {
+
+bool PrintsToTty() {
+  MaybeOpenReportFile();
+  return internal_isatty(report_fd);
+}
+
+}  // namespace __sanitizer