diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index e9a6faa37c36b..796844a896243 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -149,7 +149,7 @@ endforeach()
 # As we migrate runtimes to using the bootstrapping build, the set of default runtimes
 # should grow as we remove those runtimes from LLVM_ENABLE_PROJECTS above.
 set(LLVM_DEFAULT_RUNTIMES "libcxx;libcxxabi;libunwind")
-set(LLVM_SUPPORTED_RUNTIMES "libc;libunwind;libcxxabi;libcxx;compiler-rt;openmp;llvm-libgcc;offload;flang-rt;libclc;libsycl")
+set(LLVM_SUPPORTED_RUNTIMES "libc;libunwind;libcxxabi;libcxx;compiler-rt;openmp;llvm-libgcc;offload;flang-rt;libclc;libsycl;orc-rt")
 set(LLVM_ENABLE_RUNTIMES "" CACHE STRING
   "Semicolon-separated list of runtimes to build, or \"all\" (${LLVM_DEFAULT_RUNTIMES}). Supported runtimes are ${LLVM_SUPPORTED_RUNTIMES}.")
 if(LLVM_ENABLE_RUNTIMES STREQUAL "all")
diff --git a/llvm/projects/CMakeLists.txt b/llvm/projects/CMakeLists.txt
index f254cf10806d7..f5f7c98826c2d 100644
--- a/llvm/projects/CMakeLists.txt
+++ b/llvm/projects/CMakeLists.txt
@@ -9,6 +9,7 @@ foreach(entry ${entries})
        (NOT ${entry} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR}/libcxx) AND
        (NOT ${entry} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR}/libcxxabi) AND
        (NOT ${entry} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR}/libunwind) AND
+       (NOT ${entry} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR}/orc-rt) AND
        (NOT ${entry} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR}/test-suite) AND
        (NOT ${entry} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR}/openmp) AND
        (NOT ${entry} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR}/cross-project-tests) AND
@@ -34,6 +35,7 @@ if(${LLVM_BUILD_RUNTIME})
     add_llvm_external_project(libc)
     add_llvm_external_project(libcxxabi)
     add_llvm_external_project(libcxx)
+    add_llvm_external_project(orc-rt)
   endif()
   if(NOT LLVM_BUILD_EXTERNAL_COMPILER_RT)
     add_llvm_external_project(compiler-rt)
diff --git a/orc-rt/CMakeLists.txt b/orc-rt/CMakeLists.txt
new file mode 100644
index 0000000000000..9b70bae346ceb
--- /dev/null
+++ b/orc-rt/CMakeLists.txt
@@ -0,0 +1,96 @@
+# CMake build for ORC-RT.
+
+#===============================================================================
+# Setup Project
+#===============================================================================
+
+cmake_minimum_required(VERSION 3.20.0)
+
+option(LLVM_RT_INCLUDE_TESTS "Build orcrt tests." ${LLVM_INCLUDE_TESTS})
+
+
+set(LLVM_COMMON_CMAKE_UTILS ${CMAKE_CURRENT_SOURCE_DIR}/../cmake)
+include(${LLVM_COMMON_CMAKE_UTILS}/Modules/CMakePolicy.cmake
+  NO_POLICY_SCOPE)
+
+if (ORC_RT_INCLUDE_TESTS)
+    set(LLVM_INCLUDE_UTILS YES)
+endif()
+
+project(OrcRT LANGUAGES C CXX ASM)
+
+include(GNUInstallDirs)
+
+#===============================================================================
+# Setup CMake Options
+#===============================================================================
+
+option(ORC_RT_INCLUDE_DOCS "Build the ORC-RT documentation." ON)
+option(ORC_RT_ENABLE_ASSERTIONS "Enable assertions independent of build mode." ON)
+option(ORC_RT_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
+option(ORC_RT_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
+
+set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to conform to")
+set(CMAKE_CXX_STANDARD_REQUIRED YES)
+set(CMAKE_CXX_EXTENSIONS NO)
+set(CMAKE_FOLDER "orc-rt")
+
+#===============================================================================
+# Setup Source Code
+#===============================================================================
+
+if (ORC_RT_INCLUDE_DOCS)
+    add_subdirectory(docs)
+endif()
+
+add_subdirectory(include)
+add_subdirectory(lib)
+add_subdirectory(tools)
+
+if(LLVM_INCLUDE_TESTS)
+    if(NOT TARGET FileCheck)
+        find_program(FILECHECK_EXE
+    NAMES FileCheck
+    HINTS ${LLVM_RT_TOOLS_BINARY_DIR}
+    DOC "FileCheck executable")
+    endif()
+    if(FILECHECK_EXE)
+        add_executable(FileCheck IMPORTED GLOBAL)
+        set_property(TARGET FileCheck PROPERTY IMPORTED_LOCATION "${FILECHECK_EXE}")
+        message(DEBUG "Using FileCheck: ${FILECHECK_EXE}")
+    endif()
+    if(NOT TARGET count)
+        find_program(COUNT_EXE
+            NAMES count
+            HINTS ${LLVM_RT_TOOLS_BINARY_DIR}
+            DOC "count executable")
+    endif()
+    if(COUNT_EXE)
+        add_executable(count IMPORTED GLOBAL)
+        set_property(TARGET count PROPERTY IMPORTED_LOCATION "${COUNT_EXE}")
+        message(DEBUG "Using count: ${COUNT_EXE}")
+    endif()
+    if(NOT TARGET not)
+        find_program(NOT_EXE
+            NAMES not
+            HINTS ${LLVM_RT_TOOLS_BINARY_DIR}
+            DOC "not executable")
+    endif()
+    if(NOT_EXE)
+        add_executable(not IMPORTED GLOBAL)
+        set_property(TARGET not PROPERTY IMPORTED_LOCATION "${NOT_EXE}")
+        message(DEBUG "Using not: ${NOT_EXE}")
+    endif()
+
+    set(ORCRT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+    set(ORCRT_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
+
+  add_subdirectory(test)
+  set(UNITTEST_DIR ${LLVM_THIRD_PARTY_DIR}/unittest)
+  if(EXISTS ${UNITTEST_DIR}/googletest/include/gtest/gtest.h)
+    if (NOT TARGET gtest)
+      add_subdirectory(${UNITTEST_DIR} third-party/unittest)
+    endif()
+     add_subdirectory(unittests)
+  endif()
+endif()
\ No newline at end of file
diff --git a/orc-rt/LICENSE.TXT b/orc-rt/LICENSE.TXT
new file mode 100644
index 0000000000000..53bb2e7fbc764
--- /dev/null
+++ b/orc-rt/LICENSE.TXT
@@ -0,0 +1,234 @@
+==============================================================================
+The LLVM Project is under the Apache License v2.0 with LLVM Exceptions:
+==============================================================================
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+    TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+    1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
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+      You may add Your own copyright statement to Your modifications and
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+      the conditions stated in this License.
+
+    5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+    6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
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+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+
+    Copyright [yyyy] [name of copyright owner]
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+
+---- LLVM Exceptions to the Apache 2.0 License ----
+
+As an exception, if, as a result of your compiling your source code, portions
+of this Software are embedded into an Object form of such source code, you
+may redistribute such embedded portions in such Object form without complying
+with the conditions of Sections 4(a), 4(b) and 4(d) of the License.
+
+In addition, if you combine or link compiled forms of this Software with
+software that is licensed under the GPLv2 ("Combined Software") and if a
+court of competent jurisdiction determines that the patent provision (Section
+3), the indemnity provision (Section 9) or other Section of the License
+conflicts with the conditions of the GPLv2, you may retroactively and
+prospectively choose to deem waived or otherwise exclude such Section(s) of
+the License, but only in their entirety and only with respect to the Combined
+Software.
+
+==============================================================================
+Software from third parties included in the LLVM Project:
+==============================================================================
+The LLVM Project contains third party software which is under different license
+terms. All such code will be identified clearly using at least one of two
+mechanisms:
+1) It will be in a separate directory tree with its own `LICENSE.txt` or
+   `LICENSE` file at the top containing the specific license and restrictions
+   which apply to that software, or
+2) It will contain specific license and restriction terms at the top of every
+   file.
diff --git a/orc-rt/docs/Building-orc-rt.md b/orc-rt/docs/Building-orc-rt.md
new file mode 100644
index 0000000000000..69dbe7f3f3141
--- /dev/null
+++ b/orc-rt/docs/Building-orc-rt.md
@@ -0,0 +1,74 @@
+# Building orc-rt
+
+## Getting Started
+
+The basic steps needed to build orc-rt are:
+
+* Checkout llvm-project:
+
+   * ``cd where-you-want-llvm-to-live``
+   * ``git clone https://github.com/llvm/llvm-project.git``
+
+* Configure and build orc-rt:
+
+   CMake is the only supported configuration system.
+
+   Clang is the preferred compiler when building and using orc-rt.
+
+   * ``cd where you want to build llvm``
+   * ``mkdir build``
+   * ``cd build``
+   * ``cmake -G <generator> -DLLVM_ENABLE_RUNTIMES=orc-rt [options] <llvm-monorepo>/runtimes``
+
+   For more information about configuring orc-rt see :ref:`CMake Options`.
+
+   * ``make orc-rt`` --- will build orc-rt.
+   * ``make check-orc-rt`` --- will run the test suite.
+
+   Shared and static libraries for orc-rt should now be present in
+   llvm/build/lib.
+
+* **Optional**: Install orc-rt
+
+   Remember to use the CMake option ``CMAKE_INSTALL_PREFIX`` to select a safe
+   place to install orc-rt.
+
+   * ``make install-orc-rt`` --- Will install the libraries and the headers
+
+## CMake Options
+
+Here are some of the CMake variables that are used often, along with a
+brief explanation and LLVM-specific notes. For full documentation, check the
+CMake docs or execute ``cmake --help-variable VARIABLE_NAME``.
+
+**CMAKE_BUILD_TYPE**:STRING
+  Sets the build type for ``make`` based generators. Possible values are
+  Release, Debug, RelWithDebInfo and MinSizeRel. On systems like Visual Studio
+  the user sets the build type with the IDE settings.
+
+**CMAKE_INSTALL_PREFIX**:PATH
+  Path where LLVM will be installed if "make install" is invoked or the
+  "INSTALL" target is built.
+
+**CMAKE_CXX_COMPILER**:STRING
+  The C++ compiler to use when building and testing orc-rt.
+
+## orc-rt specific options
+
+* option:: ORC_RT_ENABLE_ASSERTIONS:BOOL
+
+  **Default**: ``ON``
+
+  Toggle assertions independent of the build mode.
+
+* option:: ORC_RT_ENABLE_PEDANTIC:BOOL
+
+  **Default**: ``ON``
+
+  Compile with -Wpedantic.
+
+* option:: ORC_RT_ENABLE_WERROR:BOOL
+
+  **Default**: ``ON``
+
+  Compile with -Werror
diff --git a/orc-rt/docs/CMakeLists.txt b/orc-rt/docs/CMakeLists.txt
new file mode 100644
index 0000000000000..8709000c6254e
--- /dev/null
+++ b/orc-rt/docs/CMakeLists.txt
@@ -0,0 +1,8 @@
+if (LLVM_ENABLE_SPHINX)
+  include(AddSphinxTarget)
+  if (SPHINX_FOUND)
+    if (${SPHINX_OUTPUT_HTML})
+      add_sphinx_target(html orc-rt)
+    endif()
+  endif()
+endif()
diff --git a/orc-rt/docs/README.txt b/orc-rt/docs/README.txt
new file mode 100644
index 0000000000000..da202c5fa8391
--- /dev/null
+++ b/orc-rt/docs/README.txt
@@ -0,0 +1,13 @@
+ORC-RT Documentation
+====================
+
+The ORC-RT documentation is written using the Sphinx documentation generator. It is
+currently tested with Sphinx 5.3.0.
+
+To build the documents into html configure ORC-RT with the following cmake options:
+
+  * -DLLVM_ENABLE_SPHINX=ON
+  * -DORC_RT_INCLUDE_DOCS=ON
+
+After configuring ORC-RT with these options the make rule `docs-orc-rt-html`
+should be available.
diff --git a/orc-rt/docs/conf.py b/orc-rt/docs/conf.py
new file mode 100644
index 0000000000000..b9f197d85b847
--- /dev/null
+++ b/orc-rt/docs/conf.py
@@ -0,0 +1,253 @@
+# -*- coding: utf-8 -*-
+# ORC-RT documentation build configuration file.
+#
+# This file is execfile()d with the current directory set to its containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+from datetime import date
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+# sys.path.insert(0, os.path.abspath('.'))
+
+# -- General configuration -----------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+# needs_sphinx = '1.0'
+# Add any Sphinx extension module names here, as strings. They can be extensions
+# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
+extensions = [
+    "sphinx.ext.todo",
+    "sphinx.ext.mathjax",
+    "sphinx.ext.intersphinx",
+    "sphinx.ext.autodoc",
+]
+
+# When building man pages, we do not use the markdown pages,
+# So, we can continue without the myst_parser dependencies.
+# Doing so reduces dependencies of some packaged llvm distributions.
+try:
+    import myst_parser
+
+    extensions.append("myst_parser")
+except ImportError:
+    if not tags.has("builder-man"):
+        raise
+
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ["_templates"]
+myst_heading_anchors = 6
+
+import sphinx
+
+# The encoding of source files.
+# source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = "index"
+
+# General information about the project.
+project = "ORC-RT"
+copyright = "2025-%d, The ORC-RT Team" % date.today().year
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents. These are currently set to zero because we don't use them.
+# Should somebody consider in the future to change them, they need to be updated
+# everytime a new release comes out.
+#
+# The short version.
+# version = '0'
+# The full version, including alpha/beta/rc tags.
+# release = '0'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+# language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+# today = ''
+# Else, today_fmt is used as the format for a strftime call.
+# today_fmt = '%B %d, %Y'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+exclude_patterns = ["_build", "analyzer", "FIR/*"]
+
+# The reST default role (used for this markup: `text`) to use for all documents.
+# default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+# add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+# add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+# show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = "friendly"
+
+# A list of ignored prefixes for module index sorting.
+# modindex_common_prefix = []
+
+
+# -- Options for HTML output ---------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+html_theme = "haiku"
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+# html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+# html_theme_path = []
+
+# The name for this set of Sphinx documents.  If None, it defaults to
+# "<project> v<release> documentation".
+html_title = "ORC Runtime"
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+# html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+# html_logo = None
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+# html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+# html_static_path = []
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+html_last_updated_fmt = "%b %d, %Y"
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+# html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+# html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+# html_additional_pages = {}
+
+# If false, no module index is generated.
+# html_domain_indices = True
+
+# If false, no index is generated.
+# html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+# html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+# html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+# html_show_sphinx = True
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+# html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+# html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+# html_file_suffix = None
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = "orc-rt-doc"
+
+# If true, the reST sources are included in the HTML build as
+# _sources/name. The default is True.
+html_copy_source = False
+
+# -- Options for LaTeX output --------------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #'papersize': 'letterpaper',
+    # The font size ('10pt', '11pt' or '12pt').
+    #'pointsize': '10pt',
+    # Additional stuff for the LaTeX preamble.
+    #'preamble': '',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title, author, documentclass [howto/manual]).
+latex_documents = [
+    ("Overview", "ORC-RT.tex", "orc-rt Documentation", "The orc-rt Team", "manual"),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+# latex_logo = None
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+# latex_use_parts = False
+
+# If true, show page references after internal links.
+# latex_show_pagerefs = False
+
+# If true, show URL addresses after external links.
+# latex_show_urls = False
+
+# Documents to append as an appendix to all manuals.
+# latex_appendices = []
+
+# If false, no module index is generated.
+# latex_domain_indices = True
+
+
+# -- Options for manual page output --------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = []
+
+# If true, show URL addresses after external links.
+# man_show_urls = False
+
+
+# -- Options for Texinfo output ------------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    ("Overview"),
+]
+
+# Documents to append as an appendix to all manuals.
+# texinfo_appendices = []
+
+# If false, no module index is generated.
+# texinfo_domain_indices = True
+
+# How to display URL addresses: 'footnote', 'no', or 'inline'.
+# texinfo_show_urls = 'footnote'
diff --git a/orc-rt/docs/index.md b/orc-rt/docs/index.md
new file mode 100644
index 0000000000000..56f9bb3829c17
--- /dev/null
+++ b/orc-rt/docs/index.md
@@ -0,0 +1,54 @@
+# LLVM ORC Runtime
+
+## Overview
+
+The ORC runtime provides executor-side support code for the LLVM ORC APIs.
+
+```{eval-rst}
+.. toctree::
+   :titlesonly:
+
+   Building-orc-rt
+```
+
+### Current Status
+
+The ORC Runtime is a new, experimental project. It is being actively developed,
+and neither the ABI nor API are stable. LLVM ORC API clients should be careful
+to use an ORC Runtime from the same build as their LLVM ORC libraries.
+
+### Platform and Compiler Support
+
+* TODO
+
+The following minimum compiler versions are strongly recommended.
+
+* Clang 16 and above
+
+Anything older *may* work.
+
+### Notes and Known Issues
+
+* TODO
+
+## Getting Involved
+
+First please review our
+[Developer's Policy](https://llvm.org/docs/DeveloperPolicy.html) and
+[Getting started with LLVM](https://llvm.org/docs/GettingStarted.html).
+
+**Bug Reports**
+
+If you think you've found a bug in the ORC Runtime, please report it using
+the [LLVM bug tracker](https://github.com/llvm/llvm-project/labels/orc-rt/).
+Please use the tag "orc-rt" for new threads.
+
+**Patches**
+
+If you want to contribute a patch to th ORC runtime, please start by reading
+the LLVM
+[documentation about contributing](https://www.llvm.org/docs/Contributing.html).
+
+**Discussion and Questions**
+
+* TODO
diff --git a/orc-rt/include/CMakeLists.txt b/orc-rt/include/CMakeLists.txt
new file mode 100644
index 0000000000000..cd2032f3a5cdf
--- /dev/null
+++ b/orc-rt/include/CMakeLists.txt
@@ -0,0 +1,17 @@
+set(ORC_RT_HEADERS
+    orc-rt-c/orc-rt.h
+)
+
+# TODO: Switch to filesets when we move to cmake-3.23.
+add_library(orc-rt-headers INTERFACE)
+target_include_directories(orc-rt-headers INTERFACE
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:include>
+)
+set_property(TARGET orc-rt-headers
+    PROPERTY PUBLIC_HEADER ${ORC_RT_HEADERS}
+)
+install(TARGETS orc-rt-headers
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/
+    COMPONENT OrcRT_Development
+)
diff --git a/orc-rt/include/orc-rt-c/orc-rt.h b/orc-rt/include/orc-rt-c/orc-rt.h
new file mode 100644
index 0000000000000..31ef74f6c1e9b
--- /dev/null
+++ b/orc-rt/include/orc-rt-c/orc-rt.h
@@ -0,0 +1,32 @@
+//===- orc-rt-c/orc-rt.h - Placeholder header for orc-rt ----------*- C -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Placeholder header for initial orc-rt checkin.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ORC_RT_C_ORC_RT_H
+#define ORC_RT_C_ORC_RT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/// \addtogroup orc_rt_c_api orc-rt C APIs
+/// @{
+
+void orc_rt(void);
+
+/// @}
+///
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // ORC_RT_C_ORC_RT_H
diff --git a/orc-rt/lib/CMakeLists.txt b/orc-rt/lib/CMakeLists.txt
new file mode 100644
index 0000000000000..993f2b8b52eb7
--- /dev/null
+++ b/orc-rt/lib/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(executor)
diff --git a/orc-rt/lib/executor/CMakeLists.txt b/orc-rt/lib/executor/CMakeLists.txt
new file mode 100644
index 0000000000000..82d29455eb6df
--- /dev/null
+++ b/orc-rt/lib/executor/CMakeLists.txt
@@ -0,0 +1,13 @@
+set(files
+  orc-rt-executor.cpp
+  )
+
+add_library(orc-rt-executor STATIC ${files})
+target_link_libraries(orc-rt-executor
+  PUBLIC orc-rt-headers
+  )
+install(TARGETS orc-rt-executor
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+          COMPONENT OrcRT_Development
+  PUBLIC_HEADER DESTINATION include COMPONENT OrcRT_Development
+)
diff --git a/orc-rt/lib/executor/orc-rt-executor.cpp b/orc-rt/lib/executor/orc-rt-executor.cpp
new file mode 100644
index 0000000000000..d70488d11d3fa
--- /dev/null
+++ b/orc-rt/lib/executor/orc-rt-executor.cpp
@@ -0,0 +1,15 @@
+//===- orc-rt-executor.cpp - Placeholder implementation for orc-rt --------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Placeholder implementation file for initial orc-rt checkin.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdio.h>
+
+extern "C" void orc_rt(void) { printf("hello, world!\n"); }
diff --git a/orc-rt/test/CMakeLists.txt b/orc-rt/test/CMakeLists.txt
new file mode 100644
index 0000000000000..0de6b6b085a43
--- /dev/null
+++ b/orc-rt/test/CMakeLists.txt
@@ -0,0 +1,38 @@
+configure_lit_site_cfg(
+  ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.py.in
+  ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg.py
+  MAIN_CONFIG
+  ${CMAKE_CURRENT_SOURCE_DIR}/lit.cfg.py
+  )
+
+list(APPEND ORC_RT_TEST_DEPS
+  FileCheck
+  count
+  not
+  orc-executor
+  )
+
+add_custom_target(orc-rt-test-depends DEPENDS ${ORC_RT_TEST_DEPS})
+set_target_properties(orc-rt-test-depends PROPERTIES FOLDER "orc-rt/Tests")
+
+add_lit_testsuite(check-orc-rt "Running the ORCRT regression tests"
+  ${CMAKE_CURRENT_BINARY_DIR}
+  DEPENDS ${ORC_RT_TEST_DEPS}
+  )
+
+add_lit_testsuites(ORC-RT ${CMAKE_CURRENT_SOURCE_DIR}
+  DEPENDS ${ORC_RT_TEST_DEPS}
+)
+
+# Add orc-rt unit tests
+configure_lit_site_cfg(
+  ${CMAKE_CURRENT_SOURCE_DIR}/unit/lit.site.cfg.py.in
+  ${CMAKE_CURRENT_BINARY_DIR}/unit/lit.site.cfg
+  MAIN_CONFIG
+  ${CMAKE_CURRENT_SOURCE_DIR}/unit/lit.cfg.py)
+
+add_lit_testsuite(check-orcrt-unit "Running orc-rt unittest suites"
+  ${CMAKE_CURRENT_BINARY_DIR}/unit
+  EXCLUDE_FROM_CHECK_ALL
+  DEPENDS OrcRTUnitTests)
+
diff --git a/orc-rt/test/init.test b/orc-rt/test/init.test
new file mode 100644
index 0000000000000..eaa666ef75d79
--- /dev/null
+++ b/orc-rt/test/init.test
@@ -0,0 +1 @@
+RUN: orc-executor %s %s
diff --git a/orc-rt/test/lit.cfg.py b/orc-rt/test/lit.cfg.py
new file mode 100644
index 0000000000000..93eacf972867c
--- /dev/null
+++ b/orc-rt/test/lit.cfg.py
@@ -0,0 +1,63 @@
+# -*- Python -*-
+
+import os
+import platform
+import re
+import subprocess
+import tempfile
+
+import lit.formats
+import lit.util
+
+from lit.llvm import llvm_config
+from lit.llvm.subst import ToolSubst
+from lit.llvm.subst import FindTool
+
+
+# name: The name of this test suite.
+config.name = "ORCRT"
+
+# TODO: Consolidate the logic for turning on the internal shell by default for all LLVM test suites.
+# See https://github.com/llvm/llvm-project/issues/106636 for more details.
+#
+# We prefer the lit internal shell which provides a better user experience on failures
+# unless the user explicitly disables it with LIT_USE_INTERNAL_SHELL=0 env var.
+use_lit_shell = True
+lit_shell_env = os.environ.get("LIT_USE_INTERNAL_SHELL")
+if lit_shell_env:
+    use_lit_shell = lit.util.pythonize_bool(lit_shell_env)
+
+config.test_format = lit.formats.ShTest(execute_external=not use_lit_shell)
+
+# suffixes: A list of file extensions to treat as test files.
+config.suffixes = [
+    ".ll",
+    ".test",
+    ".c",
+]
+# test_source_root: The root path where tests are located.
+config.test_source_root = os.path.dirname(__file__)
+
+# test_exec_root: The root path where tests should be run.
+config.test_exec_root = os.path.join(config.orcrt_obj_root, "test")
+llvm_config.with_environment(
+    "PATH",
+    os.path.join(config.orcrt_obj_root, "tools", "orc-executor"),
+    append_path=True)
+config.substitutions.append(("%PATH%", config.environment["PATH"]))
+# config.substitutions.append(("%shlibext", config.llvm_shlib_ext))
+config.substitutions.append(("%llvm_src_root", config.llvm_src_root))
+# config.substitutions.append(("%host_cxx", config.host_cxx))
+# config.substitutions.append(("%host_cc", config.host_cc))
+if config.llvm_rt_tools_dir:
+    config.llvm_tools_dir = config.llvm_rt_tools_dir
+llvm_config.use_default_substitutions()
+
+
+# excludes: A list of directories to exclude from the testsuite. The 'Inputs'
+# subdirectories contain auxiliary inputs for various tests in their parent
+# directories.
+config.excludes = [
+    "lit.cfg.py",
+    "lit.site.cfg.py.in",
+]
diff --git a/orc-rt/test/lit.site.cfg.py.in b/orc-rt/test/lit.site.cfg.py.in
new file mode 100644
index 0000000000000..708510e0d0044
--- /dev/null
+++ b/orc-rt/test/lit.site.cfg.py.in
@@ -0,0 +1,23 @@
+@LIT_SITE_CFG_IN_HEADER@
+
+import sys
+
+config.llvm_src_root = "@LLVM_SOURCE_DIR@"
+config.llvm_obj_root = "@LLVM_BINARY_DIR@"
+config.orcrt_obj_root = "@ORCRT_BINARY_DIR@"
+config.llvm_rt_tools_dir = "@LLVM_RT_TOOLS_BINARY_DIR@"
+config.llvm_tools_dir = lit_config.substitute("@LLVM_TOOLS_DIR@")
+config.llvm_libs_dir = lit_config.substitute("@LLVM_LIBS_DIR@")
+config.llvm_shlib_dir = lit_config.substitute("@SHLIBDIR@")
+config.lit_tools_dir = "@LLVM_LIT_TOOLS_DIR@"
+config.host_triple = "@LLVM_HOST_TRIPLE@"
+config.target_triple = "@LLVM_TARGET_TRIPLE@"
+config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
+config.host_arch = "@HOST_ARCH@"
+config.python_executable = "@Python3_EXECUTABLE@"
+config.targets_to_build = "@ORCRT_TARGETS_TO_BUILD@"
+
+import lit.llvm
+lit.llvm.initialize(lit_config, config)
+# Let the main config do the real work.
+lit_config.load_config(config, "@ORCRT_SOURCE_DIR@/test/lit.cfg.py")
diff --git a/orc-rt/test/unit/lit.cfg.py b/orc-rt/test/unit/lit.cfg.py
new file mode 100644
index 0000000000000..0a0a26672c2e3
--- /dev/null
+++ b/orc-rt/test/unit/lit.cfg.py
@@ -0,0 +1,22 @@
+# -*- Python -*-
+
+# Configuration file for the 'lit' test runner.
+
+import os
+import subprocess
+
+import lit.formats
+
+# name: The name of this test suite.
+config.name = "ORCRT-Unit"
+
+# suffixes: A list of file extensions to treat as test files.
+config.suffixes = []
+
+# test_source_root: The root path where tests are located.
+# test_exec_root: The root path where tests should be run.
+config.test_exec_root = os.path.join(config.orcrt_obj_root, "unittests")
+config.test_source_root = config.test_exec_root
+
+# testFormat: The test format to use to interpret tests.
+config.test_format = lit.formats.GoogleTest(config.llvm_build_mode, "Tests")
\ No newline at end of file
diff --git a/orc-rt/test/unit/lit.site.cfg.py.in b/orc-rt/test/unit/lit.site.cfg.py.in
new file mode 100644
index 0000000000000..1ffe100166910
--- /dev/null
+++ b/orc-rt/test/unit/lit.site.cfg.py.in
@@ -0,0 +1,17 @@
+@LIT_SITE_CFG_IN_HEADER@
+
+config.llvm_src_root = "@LLVM_SOURCE_DIR@"
+config.llvm_obj_root = "@LLVM_BINARY_DIR@"
+config.llvm_tools_dir = lit_config.substitute("@LLVM_TOOLS_DIR@")
+config.llvm_libs_dir = lit_config.substitute("@LLVM_LIBS_DIR@")
+config.llvm_build_mode = lit_config.substitute("@LLVM_BUILD_MODE@")
+config.lit_tools_dir = "@LLVM_LIT_TOOLS_DIR@"
+config.llvm_obj_root = "@LLVM_BINARY_DIR@"
+config.orcrt_obj_root = "@ORCRT_BINARY_DIR@"
+config.target_triple = "@LLVM_TARGET_TRIPLE@"
+
+import lit.llvm
+lit.llvm.initialize(lit_config, config)
+
+# Let the main config do the real work.
+lit_config.load_config(config, "@ORCRT_SOURCE_DIR@/test/unit/lit.cfg.py")
\ No newline at end of file
diff --git a/orc-rt/tools/CMakeLists.txt b/orc-rt/tools/CMakeLists.txt
new file mode 100644
index 0000000000000..fc78ea4131606
--- /dev/null
+++ b/orc-rt/tools/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(orc-executor)
diff --git a/orc-rt/tools/orc-executor/CMakeLists.txt b/orc-rt/tools/orc-executor/CMakeLists.txt
new file mode 100644
index 0000000000000..b4a2292f58173
--- /dev/null
+++ b/orc-rt/tools/orc-executor/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_executable(orc-executor orc-executor.cpp)
+target_link_libraries(orc-executor PRIVATE orc-rt-executor)
diff --git a/orc-rt/tools/orc-executor/orc-executor.cpp b/orc-rt/tools/orc-executor/orc-executor.cpp
new file mode 100644
index 0000000000000..92bdd5bf5d53f
--- /dev/null
+++ b/orc-rt/tools/orc-executor/orc-executor.cpp
@@ -0,0 +1,18 @@
+//===- orc-executor.cpp - Placeholder implementation for orc-rt ----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Placeholder implementation file for initial orc-rt checkin.
+//
+//===----------------------------------------------------------------------===//
+
+#include "orc-rt-c/orc-rt.h"
+
+int main(int argc, char *argv[]) {
+  orc_rt();
+  return 0;
+}
diff --git a/orc-rt/unittests/CMakeLists.txt b/orc-rt/unittests/CMakeLists.txt
new file mode 100644
index 0000000000000..4476d43ca4ae5
--- /dev/null
+++ b/orc-rt/unittests/CMakeLists.txt
@@ -0,0 +1,11 @@
+add_custom_target(OrcRTUnitTests)
+set_target_properties(OrcRTUnitTests PROPERTIES FOLDER "orcrt/Tests")
+
+function(add_orc_rt_unittest test_dirname)
+  add_unittest(OrcRTUnitTests ${test_dirname} ${ARGN})
+endfunction()
+
+add_orc_rt_unittest(CoreTests
+  init.cpp
+  DISABLE_LLVM_LINK_LLVM_DYLIB
+  )
diff --git a/orc-rt/unittests/init.cpp b/orc-rt/unittests/init.cpp
new file mode 100644
index 0000000000000..24f12127f49f5
--- /dev/null
+++ b/orc-rt/unittests/init.cpp
@@ -0,0 +1,6 @@
+#include "gtest/gtest.h"
+
+
+TEST(TEST, emptyFuncs) {
+  ASSERT_EQ(True, False);
+}
diff --git a/runtimes/CMakeLists.txt b/runtimes/CMakeLists.txt
index bfb4341b172cc..62d8527a6c087 100644
--- a/runtimes/CMakeLists.txt
+++ b/runtimes/CMakeLists.txt
@@ -35,7 +35,7 @@ list(INSERT CMAKE_MODULE_PATH 0
 
 # We order libraries to mirror roughly how they are layered, except that compiler-rt can depend
 # on libc++, so we put it after.
-set(LLVM_DEFAULT_RUNTIMES "libc;libunwind;libcxxabi;pstl;libcxx;compiler-rt;libclc;openmp;offload")
+set(LLVM_DEFAULT_RUNTIMES "libc;libunwind;libcxxabi;pstl;libcxx;compiler-rt;libclc;openmp;offload;orc-rt")
 set(LLVM_SUPPORTED_RUNTIMES "${LLVM_DEFAULT_RUNTIMES};llvm-libgcc;flang-rt;libsycl")
 set(LLVM_ENABLE_RUNTIMES "" CACHE STRING
   "Semicolon-separated list of runtimes to build, or \"all\" (${LLVM_DEFAULT_RUNTIMES}). Supported runtimes are ${LLVM_SUPPORTED_RUNTIMES}.")
@@ -44,7 +44,7 @@ if(LLVM_ENABLE_RUNTIMES STREQUAL "all" )
 endif()
 include(SortSubset)
 sort_subset("${LLVM_SUPPORTED_RUNTIMES}" "${LLVM_ENABLE_RUNTIMES}" LLVM_ENABLE_RUNTIMES)
-
+set(LLVM_RT_TOOLS_BINARY_DIR ${LLVM_TOOLS_BINARY_DIR} CACHE STRING "runtime path to required test tools")
 foreach(proj ${LLVM_ENABLE_RUNTIMES})
   set(proj_dir "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
   if(IS_DIRECTORY ${proj_dir} AND EXISTS ${proj_dir}/CMakeLists.txt)
@@ -254,7 +254,6 @@ foreach(entry ${runtimes})
   # will be included under here.
   set(HAVE_${canon_name} ON)
 endforeach()
-
 if(LLVM_INCLUDE_TESTS)
   # If built with the runtimes build (rooted at runtimes/CMakeLists.txt), we
   # won't have llvm-lit. If built with the bootstrapping build (rooted at