3 files changed, 109 insertions, 0 deletions
diff --git a/build/unix/stdc++compat/Makefile.in b/build/unix/stdc++compat/Makefile.in
new file mode 100644
index 000000000..054c1c023
--- /dev/null
+++ b/build/unix/stdc++compat/Makefile.in
@@ -0,0 +1,7 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+ENABLE_CLANG_PLUGIN :=
+
+include $(topsrcdir)/config/rules.mk
diff --git a/build/unix/stdc++compat/moz.build b/build/unix/stdc++compat/moz.build
new file mode 100644
index 000000000..01663f37d
--- /dev/null
+++ b/build/unix/stdc++compat/moz.build
@@ -0,0 +1,24 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+if CONFIG['MOZ_LIBSTDCXX_TARGET_VERSION']:
+    Library('stdc++compat')
+    SOURCES += ['stdc++compat.cpp']
+
+if CONFIG['MOZ_LIBSTDCXX_HOST_VERSION']:
+    HostLibrary('host_stdc++compat')
+    HOST_SOURCES += [
+        'stdc++compat.cpp',
+    ]
+
+FORCE_STATIC_LIB = True
+
+NO_PGO = True
+
+DISABLE_STL_WRAPPING = True
+
+DEFINES['MOZ_LIBSTDCXX_VERSION'] = CONFIG['MOZ_LIBSTDCXX_TARGET_VERSION']
+HOST_DEFINES['MOZ_LIBSTDCXX_VERSION'] = CONFIG['MOZ_LIBSTDCXX_HOST_VERSION']
diff --git a/build/unix/stdc++compat/stdc++compat.cpp b/build/unix/stdc++compat/stdc++compat.cpp
new file mode 100644
index 000000000..95a7a9afe
--- /dev/null
+++ b/build/unix/stdc++compat/stdc++compat.cpp
@@ -0,0 +1,78 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <ostream>
+#include <istream>
+#include <string>
+#include <stdarg.h>
+#include <stdio.h>
+#include <mozilla/Assertions.h>
+
+/* GLIBCXX_3.4.8  is from gcc 4.1.1 (111691)
+   GLIBCXX_3.4.9  is from gcc 4.2.0 (111690)
+   GLIBCXX_3.4.10 is from gcc 4.3.0 (126287)
+   GLIBCXX_3.4.11 is from gcc 4.4.0 (133006)
+   GLIBCXX_3.4.12 is from gcc 4.4.1 (147138)
+   GLIBCXX_3.4.13 is from gcc 4.4.2 (151127)
+   GLIBCXX_3.4.14 is from gcc 4.5.0 (151126)
+   GLIBCXX_3.4.15 is from gcc 4.6.0 (160071)
+   GLIBCXX_3.4.16 is from gcc 4.6.1 (172240)
+   GLIBCXX_3.4.17 is from gcc 4.7.0 (174383)
+   GLIBCXX_3.4.18 is from gcc 4.8.0 (190787)
+   GLIBCXX_3.4.19 is from gcc 4.8.1 (199309)
+   GLIBCXX_3.4.20 is from gcc 4.9.0 (199307)
+   GLIBCXX_3.4.21 is from gcc 5.0 (210290)
+
+This file adds the necessary compatibility tricks to avoid symbols with
+version GLIBCXX_3.4.16 and bigger, keeping binary compatibility with
+libstdc++ 4.6.1.
+
+*/
+
+#define GLIBCXX_VERSION(a, b, c) (((a) << 16) | ((b) << 8) | (c))
+
+#if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 20)
+namespace std {
+
+    /* We shouldn't be throwing exceptions at all, but it sadly turns out
+       we call STL (inline) functions that do. */
+    void __throw_out_of_range_fmt(char const* fmt, ...)
+    {
+        va_list ap;
+        char buf[1024]; // That should be big enough.
+
+        va_start(ap, fmt);
+        vsnprintf(buf, sizeof(buf), fmt, ap);
+        buf[sizeof(buf) - 1] = 0;
+        va_end(ap);
+
+        __throw_range_error(buf);
+    }
+
+}
+#endif
+
+#if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 20)
+/* Technically, this symbol is not in GLIBCXX_3.4.20, but in CXXABI_1.3.8,
+   but that's equivalent, version-wise. Those calls are added by the compiler
+   itself on `new Class[n]` calls. */
+extern "C" void
+__cxa_throw_bad_array_new_length()
+{
+    MOZ_CRASH();
+}
+#endif
+
+#if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 21)
+/* While we generally don't build with exceptions, we have some host tools
+ * that do use them. libstdc++ from GCC 5.0 added exception constructors with
+ * char const* argument. Older versions only have a constructor with
+ * std::string. */
+namespace std {
+    runtime_error::runtime_error(char const* s)
+    : runtime_error(std::string(s))
+    {
+    }
+}
+#endif