Add libbacktrace submodule.

Change-Id: I40db6373718504cd2df3e328cefecb394e47e5c1 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27783Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Ben Clayton <bclayton@google.com> Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

Add libbacktrace submodule.
755467c4 · Ben Clayton · f45b3881 · 755467c4 · 755467c4 · 5a99ff7f
Commit 755467c4 authored Mar 23, 2019 by Ben Clayton
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.gitmodules .gitmodules +4 -0

CMakeLists.txt CMakeLists.txt +11 -0

src third_party/libbacktrace/src +1 -0

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--- a/.gitmodules
+++ b/.gitmodules
 [submodule "third_party/googletest"]
 	path = third_party/googletest
 	url = https://github.com/google/googletest.git
+
+[submodule "third_party/libbacktrace/src"]
+	path = third_party/libbacktrace/src
+	url = https://github.com/ianlancetaylor/libbacktrace.git
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -123,6 +123,17 @@ if (NOT TARGET gtest)
    endif()
 endif()

+if (NOT TARGET libbacktrace)
+    if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/libbacktrace/src/.git)
+        message(WARNING "
+      third_party/libbacktrace/src submodule missing.
+      Running 'git submodule update --init' to download it:
+        ")
+
+        execute_process(COMMAND git submodule update --init)
+    endif()
+endif()
+
 ###########################################################
 # Convenience macros
 ###########################################################

--- a/src @ 5a99ff7f
+++ b/src @ 5a99ff7f
+Subproject commit 5a99ff7fed66b8ea8f09c9805c138524a7035ece