Add 'src/third_party/libcxx/' from commit '7524ef50093a376f334a62a7e5…

…cebf5d238d4c99'

git-subtree-dir: src/third_party/libcxx
git-subtree-mainline: 3566d75
git-subtree-split: 7524ef5

src/third_party/libcxx/.arcconfig

@@ -0,0 +1,4 @@
+{
+  "repository.callsign" : "CXX",
+  "conduit_uri" : "https://reviews.llvm.org/"
+}

src/third_party/libcxx/.clang-format

@@ -0,0 +1,13 @@
+BasedOnStyle: LLVM
+
+---
+Language: Cpp
+Standard: Cpp03
+
+AlwaysBreakTemplateDeclarations: true
+PointerAlignment: Left
+
+# Disable formatting options which may break tests.
+SortIncludes: false
+ReflowComments: false
+---

src/third_party/libcxx/.gitignore

@@ -0,0 +1,61 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+#lib/ # We actually have things checked in to lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.cache
+nosetests.xml
+coverage.xml
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# MSVC libraries test harness
+env.lst
+keep.lst
+
+# Editor by-products
+.vscode/