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diff --git a/externals/breakpad/src/common/stabs_to_module_unittest.cc b/externals/breakpad/src/common/stabs_to_module_unittest.cc
new file mode 100644
index 0000000000..c6d40281bd
--- /dev/null
+++ b/externals/breakpad/src/common/stabs_to_module_unittest.cc
@@ -0,0 +1,260 @@
+// Copyright 2010 Google LLC
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google LLC nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
+
+// dump_stabs_unittest.cc: Unit tests for StabsToModule.
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>  // Must come first
+#endif
+
+#include <vector>
+
+#include "breakpad_googletest_includes.h"
+#include "common/stabs_to_module.h"
+
+using google_breakpad::Module;
+using google_breakpad::StabsToModule;
+using std::vector;
+
+TEST(StabsToModule, SimpleCU) {
+  Module m("name", "os", "arch", "id");
+  StabsToModule h(&m);
+
+  // Feed in a simple compilation unit that defines a function with
+  // one line.
+  EXPECT_TRUE(h.StartCompilationUnit("compilation-unit", 0x9f4d1271e50db93bLL,
+                                     "build-directory"));
+  EXPECT_TRUE(h.StartFunction("function", 0xfde4abbed390c394LL));
+  EXPECT_TRUE(h.Line(0xfde4abbed390c394LL, "source-file-name", 174823314));
+  EXPECT_TRUE(h.EndFunction(0xfde4abbed390c3a4LL));
+  EXPECT_TRUE(h.EndCompilationUnit(0xfee4abbed390c3a4LL));
+  h.Finalize();
+
+  // Now check to see what has been added to the Module.
+  Module::File *file = m.FindExistingFile("source-file-name");
+  ASSERT_TRUE(file != NULL);
+
+  vector<Module::Function*> functions;
+  m.GetFunctions(&functions, functions.end());
+  ASSERT_EQ((size_t) 1, functions.size());
+  Module::Function *function = functions[0];
+  EXPECT_STREQ("function", function->name.str().c_str());
+  EXPECT_EQ(0xfde4abbed390c394LL, function->address);
+  EXPECT_EQ(0x10U, function->ranges[0].size);
+  EXPECT_EQ(0U, function->parameter_size);
+  ASSERT_EQ((size_t) 1, function->lines.size());
+  Module::Line *line = &function->lines[0];
+  EXPECT_EQ(0xfde4abbed390c394LL, line->address);
+  EXPECT_EQ(0x10U, line->size); // derived from EndFunction
+  EXPECT_TRUE(line->file == file);
+  EXPECT_EQ(174823314, line->number);
+}
+
+#ifdef __GNUC__
+// Function name mangling can vary by compiler, so only run mangled-name
+// tests on GCC for simplicity's sake.
+TEST(StabsToModule, Externs) {
+  Module m("name", "os", "arch", "id");
+  StabsToModule h(&m);
+
+  // Feed in a few Extern symbols.
+  EXPECT_TRUE(h.Extern("_foo", 0xffff));
+  EXPECT_TRUE(h.Extern("__Z21dyldGlobalLockAcquirev", 0xaaaa));
+  EXPECT_TRUE(h.Extern("_MorphTableGetNextMorphChain", 0x1111));
+  h.Finalize();
+
+  // Now check to see what has been added to the Module.
+  vector<Module::Extern*> externs;
+  m.GetExterns(&externs, externs.end());
+  ASSERT_EQ((size_t) 3, externs.size());
+  Module::Extern *extern1 = externs[0];
+  EXPECT_STREQ("MorphTableGetNextMorphChain", extern1->name.c_str());
+  EXPECT_EQ((Module::Address)0x1111, extern1->address);
+  Module::Extern *extern2 = externs[1];
+  EXPECT_STREQ("dyldGlobalLockAcquire()", extern2->name.c_str());
+  EXPECT_EQ((Module::Address)0xaaaa, extern2->address);
+  Module::Extern *extern3 = externs[2];
+  EXPECT_STREQ("foo", extern3->name.c_str());
+  EXPECT_EQ((Module::Address)0xffff, extern3->address);
+}
+#endif  // __GNUC__
+
+TEST(StabsToModule, DuplicateFunctionNames) {
+  Module m("name", "os", "arch", "id");
+  StabsToModule h(&m);
+
+  // Compilation unit with one function, mangled name.
+  EXPECT_TRUE(h.StartCompilationUnit("compilation-unit", 0xf2cfda36ecf7f46cLL,
+                                     "build-directory"));
+  EXPECT_TRUE(h.StartFunction("funcfoo",
+                              0xf2cfda36ecf7f46dLL));
+  EXPECT_TRUE(h.EndFunction(0));
+  EXPECT_TRUE(h.StartFunction("funcfoo",
+                              0xf2cfda36ecf7f46dLL));
+  EXPECT_TRUE(h.EndFunction(0));
+  EXPECT_TRUE(h.EndCompilationUnit(0));
+
+  h.Finalize();
+
+  // Now check to see what has been added to the Module.
+  Module::File *file = m.FindExistingFile("compilation-unit");
+  ASSERT_TRUE(file != NULL);
+
+  vector<Module::Function*> functions;
+  m.GetFunctions(&functions, functions.end());
+  ASSERT_EQ(1U, functions.size());
+
+  Module::Function *function = functions[0];
+  EXPECT_EQ(0xf2cfda36ecf7f46dLL, function->address);
+  EXPECT_LT(0U, function->ranges[0].size); // should have used dummy size
+  EXPECT_EQ(0U, function->parameter_size);
+  ASSERT_EQ(0U, function->lines.size());
+}
+
+TEST(InferSizes, LineSize) {
+  Module m("name", "os", "arch", "id");
+  StabsToModule h(&m);
+
+  // Feed in a simple compilation unit that defines a function with
+  // one line.
+  EXPECT_TRUE(h.StartCompilationUnit("compilation-unit", 0xb4513962eff94e92LL,
+                                     "build-directory"));
+  EXPECT_TRUE(h.StartFunction("function", 0xb4513962eff94e92LL));
+  EXPECT_TRUE(h.Line(0xb4513962eff94e92LL, "source-file-name-1", 77396614));
+  EXPECT_TRUE(h.Line(0xb4513963eff94e92LL, "source-file-name-2", 87660088));
+  EXPECT_TRUE(h.EndFunction(0));  // unknown function end address
+  EXPECT_TRUE(h.EndCompilationUnit(0)); // unknown CU end address
+  EXPECT_TRUE(h.StartCompilationUnit("compilation-unit-2", 0xb4523963eff94e92LL,
+                                     "build-directory-2")); // next boundary
+  EXPECT_TRUE(h.EndCompilationUnit(0));
+  h.Finalize();
+
+  // Now check to see what has been added to the Module.
+  Module::File *file1 = m.FindExistingFile("source-file-name-1");
+  ASSERT_TRUE(file1 != NULL);
+  Module::File *file2 = m.FindExistingFile("source-file-name-2");
+  ASSERT_TRUE(file2 != NULL);
+
+  vector<Module::Function*> functions;
+  m.GetFunctions(&functions, functions.end());
+  ASSERT_EQ((size_t) 1, functions.size());
+
+  Module::Function *function = functions[0];
+  EXPECT_STREQ("function", function->name.str().c_str());
+  EXPECT_EQ(0xb4513962eff94e92LL, function->address);
+  EXPECT_EQ(0x1000100000000ULL, function->ranges[0].size); // inferred from CU end
+  EXPECT_EQ(0U, function->parameter_size);
+  ASSERT_EQ((size_t) 2, function->lines.size());
+
+  Module::Line *line1 = &function->lines[0];
+  EXPECT_EQ(0xb4513962eff94e92LL, line1->address);
+  EXPECT_EQ(0x100000000ULL, line1->size); // derived from EndFunction
+  EXPECT_TRUE(line1->file == file1);
+  EXPECT_EQ(77396614, line1->number);
+
+  Module::Line *line2 = &function->lines[1];
+  EXPECT_EQ(0xb4513963eff94e92LL, line2->address);
+  EXPECT_EQ(0x1000000000000ULL, line2->size); // derived from EndFunction
+  EXPECT_TRUE(line2->file == file2);
+  EXPECT_EQ(87660088, line2->number);
+}
+
+#ifdef __GNUC__
+// Function name mangling can vary by compiler, so only run mangled-name
+// tests on GCC for simplicity's sake.
+TEST(FunctionNames, Mangled) {
+  Module m("name", "os", "arch", "id");
+  StabsToModule h(&m);
+
+  // Compilation unit with one function, mangled name.
+  EXPECT_TRUE(h.StartCompilationUnit("compilation-unit", 0xf2cfda63cef7f46cLL,
+                                     "build-directory"));
+  EXPECT_TRUE(h.StartFunction("_ZNSt6vectorIySaIyEE9push_backERKy",
+                              0xf2cfda63cef7f46dLL));
+  EXPECT_TRUE(h.EndFunction(0));
+  EXPECT_TRUE(h.EndCompilationUnit(0));
+
+  h.Finalize();
+
+  // Now check to see what has been added to the Module.
+  Module::File *file = m.FindExistingFile("compilation-unit");
+  ASSERT_TRUE(file != NULL);
+
+  vector<Module::Function*> functions;
+  m.GetFunctions(&functions, functions.end());
+  ASSERT_EQ(1U, functions.size());
+
+  Module::Function *function = functions[0];
+  // This is GCC-specific, but we shouldn't be seeing STABS data anywhere
+  // but Linux.
+  EXPECT_THAT(function->name.str(), ::testing::ContainsRegex(
+    "std::vector<unsigned long long, std::allocator<unsigned long long>\\s?>::"
+    "push_back\\(unsigned long long const&\\)"));
+  EXPECT_EQ(0xf2cfda63cef7f46dLL, function->address);
+  EXPECT_LT(0U, function->ranges[0].size); // should have used dummy size
+  EXPECT_EQ(0U, function->parameter_size);
+  ASSERT_EQ(0U, function->lines.size());
+}
+#endif  // __GNUC__
+
+// The GNU toolchain can omit functions that are not used; however,
+// when it does so, it doesn't clean up the debugging information that
+// refers to them. In STABS, this results in compilation units whose
+// SO addresses are zero.
+TEST(Omitted, Function) {
+  Module m("name", "os", "arch", "id");
+  StabsToModule h(&m);
+
+  // The StartCompilationUnit and EndCompilationUnit calls may both have an
+  // address of zero if the compilation unit has had sections removed.
+  EXPECT_TRUE(h.StartCompilationUnit("compilation-unit", 0, "build-directory"));
+  EXPECT_TRUE(h.StartFunction("function", 0x2a133596));
+  EXPECT_TRUE(h.EndFunction(0));
+  EXPECT_TRUE(h.EndCompilationUnit(0));
+}
+
+// TODO --- if we actually cared about STABS. Even without these we've
+// got full coverage of non-failure source lines in dump_stabs.cc.
+
+// Line size from next line
+// Line size from function end
+// Line size from next function start
+// line size from cu end
+// line size from next cu start
+// fallback size is something plausible
+
+// function size from function end
+// function size from next function start
+// function size from cu end
+// function size from next cu start
+// fallback size is something plausible
+
+// omitting functions outside the compilation unit's address range
+// zero-line, one-line, many-line functions