Bug 1025605 - Add stdc++-compat hack for std::__throw_out_of_range_fmt and __cxa_throw_bad_array_new_length. r=nfroyd

build/unix/stdc++compat/stdc++compat.cpp

@@ -5,6 +5,9 @@
 #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)
@@ -14,7 +17,11 @@
    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 form gcc 4.6.1 (172240) */
+   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) */
 
 #define GLIBCXX_VERSION(a, b, c) (((a) << 16) | ((b) << 8) | (c))
 
@@ -140,4 +147,32 @@ namespace std __attribute__((visibility("default"))) {
     void ctype<char>::_M_widen_init() const {}
 #endif
 
+#if MOZ_LIBSTDCXX_VERSION >= GLIBCXX_VERSION(3, 4, 20)
+    /* 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