more exception-tracer detection of libstdc++

Summary: Fixes: https://github.com/facebook/folly/issues/1586.

Reviewed By: luciang

Differential Revision: D28694175

fbshipit-source-id: 56d57e99d5cee61004a499d8cf16da9a03acbcec

folly/experimental/exception_tracer/ExceptionCounterLib.cpp

@@ -31,6 +31,8 @@
 
 #if FOLLY_HAVE_ELF && FOLLY_HAVE_DWARF
 
+#if defined(__GLIBCXX__)
+
 using namespace folly::exception_tracer;
 
 namespace {
@@ -143,4 +145,6 @@ Initializer initializer;
 
 } // namespace
 
+#endif // defined(__GLIBCXX__)
+
 #endif // FOLLY_HAVE_ELF && FOLLY_HAVE_DWARF

folly/experimental/exception_tracer/SmartExceptionTracer.cpp

@@ -25,6 +25,8 @@
 
 #if FOLLY_HAVE_ELF && FOLLY_HAVE_DWARF
 
+#if defined(__GLIBCXX__)
+
 namespace folly {
 namespace exception_tracer {
 namespace {
@@ -185,4 +187,6 @@ ExceptionInfo getAsyncTrace(const std::exception& ex) {
 } // namespace exception_tracer
 } // namespace folly
 
+#endif // defined(__GLIBCXX__)
+
 #endif // FOLLY_HAVE_ELF && FOLLY_HAVE_DWARF

folly/experimental/exception_tracer/SmartExceptionTracer.h

@@ -21,6 +21,8 @@
 
 #if FOLLY_HAVE_ELF && FOLLY_HAVE_DWARF
 
+#if defined(__GLIBCXX__)
+
 namespace folly {
 namespace exception_tracer {
 
@@ -39,4 +41,6 @@ ExceptionInfo getAsyncTrace(const exception_wrapper& ew);
 } // namespace exception_tracer
 } // namespace folly
 
+#endif // defined(__GLIBCXX__)
+
 #endif // FOLLY_HAVE_ELF && FOLLY_HAVE_DWARF