[Docs] Unify build instructions

[JDevlieghere]

Summary

The current build instructions are structured according the host platform. Instead of having instructions on how to build with CMake repeated for every platform, I propose unifying them and having subsections if things are different for a certain platform.

[stella.stamenova]

lldb/docs/resources/build.rst

151–152

This is not Windows specific and it is frequently used on non-Windows platforms. The other properties are also technically not Windows specific, though they are usually used on Windows.

[xiaobai]

Thanks for doing this! :D

lldb/docs/resources/build.rst

156–157

The windows invocation should probably be more suited towards what one might see building on windows. See https://github.com/apple/swift/blob/master/docs/WindowsBuild.md#9-build-lldb as an example of what it might look like.

[JDevlieghere]

• Move up custom test compilers
• Specify that the CMake options are not Windows specific

[JDevlieghere]

Make Windows invocation look like a Windows invocation

[JDevlieghere]

Landed in rL365081

[labath]

lldb/docs/resources/build.rst

17

Should we also mention lld somewhere?
Lld is a hard requirement for running tests on windows. On other platforms lld is not a hard requirement, but having it around will cause some additional tests to be run...

167–171

@mgorny: Maybe you are interested in changing the build scripts so that this is the default when targetting netbsd?

lldb/docs/resources/build.rst

 Build
 =====
 
 .. contents::
    :local:
 
-Building LLDB on Windows
-------------------------
+Preliminaries
+-------------
 
-**Required Dependencies**
+LLDB relies on many of the technologies developed by the larger LLVM project.
+In particular, it requires both Clang and LLVM itself in order to build. Due to
+this tight integration the Getting Started guides for both of these projects
+come as prerequisite reading:
+
+* `LLVM <http://llvm.org/docs/GettingStarted.html>`_
+* `Clang <http://clang.llvm.org/get_started.html>`_
+
+The following requirements are shared on all platforms.
+
+* `CMake <https://cmake.org>`_
+* `Ninja <https://ninja-build.org>`_ (strongly recommended)
+* `Python <http://www.python.org/>`_
+* `SWIG <http://swig.org/>`_
+
+Depending on your platform and package manager, one might run any of the
+commands below.
+
+::
+
+  > yum install libedit-devel libxml2-devel ncurses-devel python-devel swig
+  > sudo apt-get install build-essential subversion swig python2.7-dev libedit-dev libncurses5-dev
+  > pkg install swig python
+  > pkgin install swig python27 cmake ninja-build
+  > brew install swig cmake ninja
+
+Windows
+*******
 
 * Visual Studio 2015 or greater
-* Windows SDK 8.0 or higher. In general it is best to use the latest available version.
+* Windows SDK 8.0 or higher. In general it is best to use the latest available
+  version.
+* `GnuWin32 <http://gnuwin32.sourceforge.net/>`_
 * `Python 3.5 or higher <https://www.python.org/downloads/windows/>`_ or
   higher. Earlier versions of Python can be made to work by compiling your own
   distribution from source, but this workflow is unsupported and you are own
   your own.
-* `Ninja build tool <https://ninja-build.org/>`_ (strongly recommended)
-* `GnuWin32 <http://gnuwin32.sourceforge.net/>`_
-* `SWIG for Windows <http://www.swig.org/download.html>`_ (version 3+)
-
-
-**Optional Dependencies**
-
 * `Python Tools for Visual Studio
   <https://github.com/Microsoft/PTVS/releases>`_. If you plan to debug test
   failures or even write new tests at all, PTVS is an indispensable debugging
   extension to VS that enables full editing and debugging support for Python
   (including mixed native/managed debugging)
 
-**Preliminaries**
-
-This section describes how to set up your system and install the required
-dependencies such that they can be found when needed during the build process.
-The steps outlined here only need to be performed once.
+The steps outlined here describes how to set up your system and install the
+required dependencies such that they can be found when needed during the build
+process. They only need to be performed once.
 
 #. Install Visual Studio and the Windows SDK.
 #. Install GnuWin32, making sure ``<GnuWin32 install dir>\bin`` is added to
    your PATH environment variable.
 #. Install SWIG for Windows, making sure ``<SWIG install dir>`` is added to
    your PATH environment variable.
 
-**Building LLDB**
-
 Any command prompt from which you build LLDB should have a valid Visual Studio
 environment setup. This means you should run ``vcvarsall.bat`` or open an
 appropriate Visual Studio Command Prompt corresponding to the version you wish
 to use.
 
+Linux
+*****
+
+* `libedit <http://www.thrysoee.dk/editline>`_
+
+macOS
+*****
 
-Finally, when you are ready to build LLDB, generate CMake with the following
-command line:
+* To use the in-tree debug server on macOS, lldb needs to be code signed. For
+  more information see :ref:`CodeSigning` below.
+* If you are building both Clang and LLDB together, be sure to also check out
+  libc++, which is a required for testing on macOS.
+
+Building LLDB with CMake & Ninja
+--------------------------------
+
+CMake is a cross-platform build-generator tool. CMake does not build the
+project, it generates the files needed by your build tool. Assuming you're
+using Ninja, the invocation looks like this:
 
 ::
 
-  cmake -G Ninja <cmake variables> <path to root of llvm src tree>
+  > cmake -G Ninja <cmake variables> <path to root of llvm source tree>
 
+Once CMake has configured your build, you can run ``ninja`` to build LLDB.
 
-and run ``ninja`` to build LLDB. Information about running the LLDB test suite
-can be found on the test page.
+::
 
+  > ninja lldb
 
 Following is a description of some of the most important CMake variables which
 you are likely to encounter. A variable FOO is set by adding ``-DFOO=value`` to
 the CMake command line.
 
+If you want to debug the lldb that you're building -- that is, build it with
+debug info enabled -- pass two additional arguments to cmake before running
+ninja:
+
+::
+
+  > cmake -G Ninja \
+      -DLLDB_EXPORT_ALL_SYMBOLS=1 \
+      -DCMAKE_BUILD_TYPE=Debug
+      <path to root of llvm source tree>
+
+If you want to run the test suite, you will need a compiler to build the test
+programs. If you have Clang checked out, that will be used by default.
+Alternatively, you can specify a C and C++ compiler to be used by the test
+suite.
+
+::
+
+  > cmake -G Ninja \
+      -DLLDB_TEST_USE_CUSTOM_C_COMPILER=On \
+      -DLLDB_TEST_USE_CUSTOM_CXX_COMPILER=On \
+      -DLLDB_TEST_C_COMPILER=<path to C compiler> \
+      -DLLDB_TEST_CXX_COMPILER=<path to C++ compiler> \
+      <path to root of llvm source tree>
+
+It is strongly recommend to use a release build for the compiler to speed up
+test execution.
+
+Windows
+*******
+
+Although the following CMake variables are by no means Windows specific, they
+are commonly used on Windows.
+
 * ``LLDB_TEST_DEBUG_TEST_CRASHES`` (Default=0): If set to 1, will cause Windows
   to generate a crash dialog whenever lldb.exe or the python extension module
   crashes while running the test suite. If set to 0, LLDB will silently crash.
   Setting to 1 allows a developer to attach a JIT debugger at the time of a
   crash, rather than having to reproduce a failure or use a crash dump.
 * ``PYTHON_HOME`` (Required): Path to the folder where the Python distribution
   is installed. For example, ``C:\Python35``.
 * ``LLDB_RELOCATABLE_PYTHON`` (Default=0): When this is 0, LLDB will bind
   statically to the location specified in the ``PYTHON_HOME`` CMake variable,
   ignoring any value of ``PYTHONHOME`` set in the environment. This is most
   useful for developers who simply want to run LLDB after they build it. If you
   wish to move a build of LLDB to a different machine where Python will be in a
   different location, setting ``LLDB_RELOCATABLE_PYTHON`` to 1 will cause
   Python to use its default mechanism for finding the python installation at
   runtime (looking for installed Pythons, or using the ``PYTHONHOME``
   environment variable if it is specified).
-* ``LLDB_TEST_C_COMPILER`` or ``LLDB_TEST_CXX_COMPILER``: The test suite needs
-  to be able to find a copy of clang.exe that it can use to compile inferior
-  programs. Note that MSVC is not supported here, it must be a path to a clang
-  executable. Note that using a release clang.exe is strongly recommended here,
-  as it will make the test suite run much faster. This can be a path to any
-  recent clang.exe, including one you built yourself. These variables are
-  ignored unless the respective ``LLDB_TEST_USE_CUSTOM_C_COMPILER`` and
-  ``LLDB_TEST_USE_CUSTOM_CXX_COMPILER`` are set to ON.
 
 Sample command line:
 
 ::
 
-  cmake -G Ninja -DLLDB_TEST_DEBUG_TEST_CRASHES=1 -DPYTHON_HOME=C:\Python35 -DLLDB_TEST_USE_CUSTOM_C_COMPILER=ON -DLLDB_TEST_C_COMPILER=d:\src\llvmbuild\ninja_release\bin\clang.exe ..\..\llvm
-
-
-**Working with both Ninja and MSVC**
-
-Compiling with ninja is both faster and simpler than compiling with MSVC, but
-chances are you still want to debug LLDB with MSVC (at least until we can debug
-LLDB on Windows with LLDB!). One solution to this is to run cmake twice and
-generate the output into two different folders. One for compiling (the ninja
-folder), and one for editing / browsing / debugging (the MSVC folder).
+  > cmake -G Ninja \
+      -DLLDB_TEST_DEBUG_TEST_CRASHES=1 \
+      -DPYTHON_HOME=C:\Python35 \
+      -DLLDB_TEST_USE_CUSTOM_C_COMPILER=ON \
+      -DLLDB_TEST_C_COMPILER=d:\src\llvmbuild\ninja_release\bin\clang.exe \
+      <path to root of llvm source tree>
 
-To do this, simply run ``cmake -G Ninja <arguments>`` from one folder, and
-``cmake -G "Visual Studio 14 2015" <arguments>`` in another folder. Then you
-can open the .sln file in Visual Studio, set lldb as the startup project, and
-use F5 to run it. You need only edit the project settings to set the executable
-and the working directory to point to binaries inside of the ninja tree.
+NetBSD
+******
 
-Building LLDB on macOS
-----------------------
-
-There are two ways to build LLDB on macOS: Using Xcode and using CMake
-
-**Preliminaries**
-
-In addition to any dependencies required by LLVM and Clang, LLDB needs a few
-development packages that may also need to be installed depending on your
-system. The current list of dependencies are:
-
-* Xcode 4.3 or newer requires the "Command Line Tools" component (XCode->Preferences->Downloads->Components)
-* `Swig <http://swig.org/>`_
-
-**Building LLDB with Xcode**
-
-Building on macOS with Xcode is as easy as downloading the code and building
-the Xcode project or workspace:
-
-* Download the lldb sources.
-* Follow the code signing instructions in ``lldb/docs/code-signing.txt``.
-* In Xcode, open ``lldb/lldb.xcworkspace``, select the lldb-tool scheme, and build.
-
-**Building LLDB with CMake**
-
-First download the LLVM, Clang, libc++ and LLDB sources. Refer to this page for
-precise instructions on this step.
-
-Refer to the code signing instructions in ``lldb/docs/code-signing.txt`` for
-info on codesigning debugserver during the build.
-
-Using CMake is documented on the `Building LLVM with CMake
-<http://llvm.org/docs/CMake.html>`_ page. Ninja is the recommended generator to
-use when building LLDB with CMake.
-
-::
-
-  > cmake $PATH_TO_LLVM -G Ninja
-  > ninja lldb
-
-As noted in the "Building LLVM with CMake" page mentioned above, you can pass
-variables to cmake to change build behavior. If LLDB is built as a part of
-LLVM, then you can pass LLVM-specific CMake variables to cmake when building
-LLDB.
-
-If you are building both Clang and LLDB together, be sure to also add libc++,
-which is currently required for testing on macOS:
-
-::
+Current stable NetBSD release doesn't ship with libpanel(3), therefore it's
+required to disable curses(3) support with the
+``-DLLDB_DISABLE_CURSES:BOOL=TRUE`` option. To make sure check if
+``/usr/include/panel.h`` exists in your system.
 
-  > cmake -D LLVM_ENABLE_PROJECTS='clang;lldb;libcxx' $PATH_TO_LLVM -G Ninja
+macOS
+*****
 
-Here are some commonly used LLDB-specific CMake variables:
+Here are some commonly used LLDB-specific CMake variables on macOS.
 
-* ``LLDB_EXPORT_ALL_SYMBOLS:BOOL`` : Exports all symbols. Useful in conjunction
-  with CMAKE_BUILD_TYPE=Debug.
-* ``LLDB_BUILD_FRAMEWORK:BOOL`` : Builds LLDB.framework as Xcode would
+* ``LLDB_BUILD_FRAMEWORK:BOOL`` : Builds the LLDB.framework.
 * ``LLDB_CODESIGN_IDENTITY:STRING`` : Determines the codesign identity to use.
   An empty string means skip building debugserver to avoid codesigning.
 
-Building LLDB on Linux, FreeBSD and NetBSD
-------------------------------------------
-
-This document describes the steps needed to compile LLDB on most Linux systems,
-FreeBSD and NetBSD.
-
-**Preliminaries**
-
-LLDB relies on many of the technologies developed by the larger LLVM project.
-In particular, it requires both Clang and LLVM itself in order to build. Due to
-this tight integration the Getting Started guides for both of these projects
-come as prerequisite reading:
-
-* `LLVM <http://llvm.org/docs/GettingStarted.html>`_
-* `Clang <http://clang.llvm.org/get_started.html>`_
-
-Supported compilers for building LLDB on Linux include:
-
-* Clang 3.2
-* GCC 4.6.2 (later versions should work as well)
-
-It is recommended to use libstdc++ 4.6 (or higher) to build LLDB on Linux, but
-using libc++ is also known to work.
-
-On FreeBSD the base system Clang and libc++ may be used to build LLDB, or the
-GCC port or package.
-
-On NetBSD the base system GCC and libstdc++ are used to build LLDB, Clang/LLVM
-and libc++ should also work.
-
-In addition to any dependencies required by LLVM and Clang, LLDB needs a few
-development packages that may also need to be installed depending on your
-system. The current list of dependencies are:
-
-* `Swig <http://swig.org/>`_
-* `libedit (Linux only) <http://www.thrysoee.dk/editline>`_
-* `Python <http://www.python.org/>`_
-
-
-So for example, on a Fedora system one might run:
-
-::
-
-  > yum install libedit-devel libxml2-devel ncurses-devel python-devel swig
-
-On a Debian or Ubuntu system one might run:
-
-::
-
-  > sudo apt-get install build-essential subversion swig python2.7-dev libedit-dev libncurses5-dev
-
-or
-
-::
-
-  > sudo apt-get build-dep lldb-3.3 # or lldb-3.4
-
-
-On FreeBSD one might run:
-
-::
-
-  > pkg install swig python
+Building LLDB with CMake and Other Generators
+---------------------------------------------
 
-On NetBSD one might run:
+Compiling with ninja is both faster and simpler than compiling with MSVC or
+Xcode, but chances are you still want to debug LLDB with those IDEs. One
+solution to this is to run cmake twice and generate the output into two
+different folders. One for compiling (the ninja folder), and one for editing,
+browsing and debugging.
 
-::
-
-  > pkgin install swig python27 cmake ninja-build
-
-**To build with CMake**
-
-Using CMake is documented on the `Building LLVM with CMake
-<http://llvm.org/docs/CMake.html>`_ page. Building LLDB is possible using one
-of the following generators:
-
-* Ninja
-* Unix Makefiles
-
-**Using CMake + Ninja**
-
-Ninja is the fastest way to build LLDB! In order to use ninja, you need to have
-recent versions of CMake and ninja on your system. To build using ninja:
-
-::
-
-  > cmake ../llvm -G Ninja
-  > ninja lldb
-  > ninja check-lldb
 
+Visual Studio
+*************
 
-If you want to debug the lldb that you're building -- that is, build it with
-debug info enabled -- pass two additional arguments to cmake before running
-ninja:
+Follow the previous instructions in one directory, and generate a Visual Studio
+project in another directory.
 
 ::
 
-  > cmake ../llvm -G Ninja -DLLDB_EXPORT_ALL_SYMBOLS=1 -DCMAKE_BUILD_TYPE=Debug
+  > cmake -G "Visual Studio 14 2015" <cmake variables> <path to root of llvm source tree>
 
+Then you can open the .sln file in Visual Studio, set lldb as the startup
+project, and use F5 to run it. You need only edit the project settings to set
+the executable and the working directory to point to binaries inside of the
+ninja tree.
 
-**Using CMake + Unix Makefiles**
+Xcode
+*****
 
-If you do not have Ninja, you can still use CMake to generate Unix Makefiles that build LLDB:
+Follow the previous instructions in one directory, and generate an Xcode
+project in another directory.
 
 ::
 
-  > cmake ..
-  > make
-  > make check-lldb
-
+  > cmake -G Xcode <cmake variables> <path to root of llvm source tree>
 
-**Building API reference documentation**
 
-LLDB exposes a C++ as well as a Python API. To build the reference
-documentation for these two APIs, ensure you have the required dependencies
-installed, and build the ``lldb-python-doc`` and ``lldb-cpp-doc`` CMake
-targets.
-
-The output HTML reference documentation can be found in
-``<build-dir>/tools/lldb/docs/``.
-
-**Additional Notes**
+Building The Documentation
+--------------------------
 
-LLDB has a Python scripting capability and supplies its own Python module named
-lldb. If a script is run inside the command line lldb application, the Python
-module is made available automatically. However, if a script is to be run by a
-Python interpreter outside the command line application, the ``PYTHONPATH``
-environment variable can be used to let the Python interpreter find the lldb
-module.
+If you wish to build the optional (reference) documentation, additional
+dependencies are required:
 
-Current stable NetBSD release doesn't ship with libpanel(3), therefore it's
-required to disable curses(3) support with the
-``-DLLDB_DISABLE_CURSES:BOOL=TRUE`` option. To make sure check if
-``/usr/include/panel.h`` exists in your system.
+* Sphinx (for the website)
+* Graphviz (for the 'dot' tool)
+* doxygen (if you wish to build the C++ API reference)
+* epydoc (if you wish to build the Python API reference)
 
-The correct path can be obtained by invoking the command line lldb tool with
-the -P flag:
+To install the prerequisites for building the documentation (on Debian/Ubuntu)
+do:
 
 ::
 
-  > export PYTHONPATH=`$llvm/build/Debug+Asserts/bin/lldb -P`
+  > sudo apt-get install doxygen graphviz python3-sphinx
+  > sudo pip install epydoc
 
-If you used a different build directory or made a release build, you may need
-to adjust the above to suit your needs. To test that the lldb Python module is
-built correctly and is available to the default Python interpreter, run:
+To build the documentation, build the desired target(s).
 
 ::
 
-  > python -c 'import lldb'
-
-**Cross-compiling LLDB**
+  > cmake --build . --target docs-lldb-html
+  > cmake --build . --target lldb-cpp-doc
+  > cmake --build . --target lldb-python-doc
 
+Cross-compiling LLDB
+--------------------
 
 In order to debug remote targets running different architectures than your
 host, you will need to compile LLDB (or at least the server component) for the
 target. While the easiest solution is to just compile it locally on the target,
 this is often not feasible, and in these cases you will need to cross-compile
 LLDB on your host.
 
 Cross-compilation is often a daunting task and has a lot of quirks which depend

 * ``LLVM_HOST_TRIPLE`` : The triple of the system that lldb (or lldb-server)
   will run on. Not setting this (or setting it incorrectly) can cause a lot of
   issues with remote debugging as a lot of the choices lldb makes depend on the
   triple reported by the remote platform.
 
 You can of course also specify the usual cmake options like
 ``CMAKE_BUILD_TYPE``, etc.
 
-**Example 1: Cross-compiling for linux arm64 on Ubuntu host**
+Example 1: Cross-compiling for linux arm64 on Ubuntu host
+*********************************************************
 
 Ubuntu already provides the packages necessary to cross-compile LLDB for arm64.
 It is sufficient to install packages ``gcc-aarch64-linux-gnu``,
 ``g++-aarch64-linux-gnu``, ``binutils-aarch64-linux-gnu``. Then it is possible
 to prepare the cmake build with the following parameters:
 
 ::
 

 If you wanted to build a full version of LLDB and avoid passing
 ``-DLLDB_DISABLE_PYTHON`` and other options, you would need to obtain the
 target versions of the respective libraries. The easiest way to achieve this is
 to use the qemu-debootstrap utility, which can prepare a system image using
 qemu and chroot to simulate the target environment. Then you can install the
 necessary packages in this environment (python-dev, libedit-dev, etc.) and
 point your compiler to use them using the correct -I and -L arguments.
 
-**Example 2: Cross-compiling for Android on Linux**
+Example 2: Cross-compiling for Android on Linux
+***********************************************
 
 In the case of Android, the toolchain and all required headers and libraries
 are available in the Android NDK.
 
 The NDK also contains a cmake toolchain file, which makes configuring the build
 much simpler. The compiler, include and library paths will be configured by the
 toolchain file and all you need to do is to select the architecture
 (ANDROID_ABI) and platform level (``ANDROID_PLATFORM``, should be at least 21).
::
   -DANDROID_PLATFORM=android-21 \
   -DANDROID_ALLOW_UNDEFINED_SYMBOLS=On \
   -DLLVM_HOST_TRIPLE=aarch64-unknown-linux-android \
   -DCROSS_TOOLCHAIN_FLAGS_NATIVE='-DCMAKE_C_COMPILER=cc;-DCMAKE_CXX_COMPILER=c++'
 
 Note that currently only lldb-server is functional on android. The lldb client
 is not supported and unlikely to work.
 
-Building The Documentation
---------------------------
-
-If you wish to build the optional (reference) documentation, additional
-dependencies are required:
+Verifying Python Support
+------------------------
 
-* Sphinx (for the website)
-* Graphviz (for the 'dot' tool)
-* doxygen (if you wish to build the C++ API reference)
-* epydoc (if you wish to build the Python API reference)
+LLDB has a Python scripting capability and supplies its own Python module named
+lldb. If a script is run inside the command line lldb application, the Python
+module is made available automatically. However, if a script is to be run by a
+Python interpreter outside the command line application, the ``PYTHONPATH``
+environment variable can be used to let the Python interpreter find the lldb
+module.
 
-To install the prerequisites for building the documentation (on Debian/Ubuntu)
-do:
+The correct path can be obtained by invoking the command line lldb tool with
+the -P flag:
 
 ::
 
-  > sudo apt-get install doxygen graphviz python3-sphinx
-  > sudo pip install epydoc
+  > export PYTHONPATH=`$llvm/build/Debug+Asserts/bin/lldb -P`
 
-To build the documentation, build the desired target(s).
+If you used a different build directory or made a release build, you may need
+to adjust the above to suit your needs. To test that the lldb Python module is
+built correctly and is available to the default Python interpreter, run:
 
 ::
 
-  > cmake --build . --target docs-lldb-html
-  > cmake --build . --target lldb-cpp-doc
-  > cmake --build . --target lldb-python-doc
+  > python -c 'import lldb'
+
+.. _CodeSigning:
+
+Code Signing on macOS
+---------------------
+
+To use the in-tree debug server on macOS, lldb needs to be code signed. The
+Debug, DebugClang and Release builds are set to code sign using a code signing
+certificate named ``lldb_codesign``. This document explains how to set up the
+signing certificate.
+
+Note that it's possible to build and use lldb on macOS without setting up code
+signing by using the system's debug server. To configure lldb in this way with
+cmake, specify ``-DLLDB_CODESIGN_IDENTITY=''``.
+
+If you have re-installed a new OS, please delete all old ``lldb_codesign`` items
+from your keychain. There will be a code signing certification and a public
+and private key. Reboot after deleting them. You will also need to delete and
+build folders that contained old signed items. The darwin kernel will cache
+code signing using the executable's file system node, so you will need to
+delete the file so the kernel clears its cache.
+
+Automatic setup:
+
+* Run ``scripts/macos-setup-codesign.sh``
+
+Manual setup steps:
+
+* Launch /Applications/Utilities/Keychain Access.app
+* In Keychain Access select the ``login`` keychain in the ``Keychains`` list in
+  the upper left hand corner of the window.
+* Select the following menu item: Keychain Access->Certificate Assistant->Create a Certificate...
+* Set the following settings
+
+::
+
+  Name = lldb_codesign
+  Identity Type = Self Signed Root
+  Certificate Type = Code Signing
+
+* Click Create
+* Click Continue
+* Click Done
+* Click on the "My Certificates"
+* Double click on your new ``lldb_codesign`` certificate
+* Turn down the "Trust" disclosure triangle, scroll to the "Code Signing" trust
+  pulldown menu and select "Always Trust" and authenticate as needed using your
+  username and password.
+* Drag the new ``lldb_codesign`` code signing certificate (not the public or
+  private keys of the same name) from the ``login`` keychain to the ``System``
+  keychain in the Keychains pane on the left hand side of the main Keychain
+  Access window. This will move this certificate to the ``System`` keychain.
+  You'll have to authorize a few more times, set it to be "Always trusted" when
+  asked.
+* Remove ``~/Desktop/lldb_codesign.cer`` file on your desktop if there is one.
+* In the Keychain Access GUI, click and drag ``lldb_codesign`` in the
+  ``System`` keychain onto the desktop. The drag will create a
+  ``Desktop/lldb_codesign.cer`` file used in the next step.
+* Switch to Terminal, and run the following:
+
+::
+
+  sudo security add-trust -d -r trustRoot -p basic -p codeSign -k /Library/Keychains/System.keychain ~/Desktop/lldb_codesign.cer
+  rm -f ~/Desktop/lldb_codesign.cer
+
+* Drag the ``lldb_codesign`` certificate from the ``System`` keychain back into
+  the ``login`` keychain
+* Quit Keychain Access
+* Reboot
+* Clean by removing all previously creating code signed binaries and rebuild
+  lldb and you should be able to debug.
+
+When you build your LLDB for the first time, the Xcode GUI will prompt you for
+permission to use the ``lldb_codesign`` keychain. Be sure to click "Always
+Allow" on your first build. From here on out, the ``lldb_codesign`` will be
+trusted and you can build from the command line without having to authorize.
+Also the first time you debug using a LLDB that was built with this code
+signing certificate, you will need to authenticate once.