[clang] [clang][docs] Improve "Obtaining Clang" section (PR #71313)

[Robin Caloudis via cfe-commits]

https://github.com/robincaloudis updated https://github.com/llvm/llvm-project/pull/71313

>From 1f9e58d79dd25a2ddeb1252a53950ae4cee961a2 Mon Sep 17 00:00:00 2001
From: Robin Caloudis <53619127+robincaloudis at users.noreply.github.com>
Date: Sun, 5 Nov 2023 13:34:29 +0100
Subject: [PATCH] [clang][docs] Improve "Obtaining Clang" section

The documentation is written relatively to
`clang-llvm`, not the root repository directory.
Therefore, the `llvm-project` repo needs to be
cloned into the existing directory `clang-llvm`.
I added `mkdir ~/clang-llvm` to make the intent
of creating an empty directory explicit.
Furthermore, additional steps have been modified
accordingly.
---
 clang/docs/LibASTMatchersTutorial.rst | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/clang/docs/LibASTMatchersTutorial.rst b/clang/docs/LibASTMatchersTutorial.rst
index 37c9f178fa8df3..7947d46e04f86e 100644
--- a/clang/docs/LibASTMatchersTutorial.rst
+++ b/clang/docs/LibASTMatchersTutorial.rst
@@ -22,7 +22,7 @@ started guide <https://llvm.org/docs/GettingStarted.html>`_.
 
 .. code-block:: console
 
-      cd ~/clang-llvm
+      mkdir ~/clang-llvm && cd ~/clang-llvm
       git clone https://github.com/llvm/llvm-project.git
 
 Next you need to obtain the CMake build system and Ninja build tool.
@@ -33,11 +33,11 @@ Next you need to obtain the CMake build system and Ninja build tool.
       git clone https://github.com/martine/ninja.git
       cd ninja
       git checkout release
-      ./bootstrap.py
+      ./configure.py
       sudo cp ninja /usr/bin/
 
       cd ~/clang-llvm
-      git clone git://cmake.org/stage/cmake.git
+      git clone https://gitlab.kitware.com/cmake/cmake.git
       cd cmake
       git checkout next
       ./bootstrap
@@ -50,7 +50,7 @@ Okay. Now we'll build Clang!
 
       cd ~/clang-llvm
       mkdir build && cd build
-      cmake -G Ninja ../llvm -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" -DLLVM_BUILD_TESTS=ON  # Enable tests; default is off.
+      cmake -G Ninja ../llvm-project/llvm -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" -DCMAKE_BUILD_TYPE=Release -DLLVM_BUILD_TESTS=ON
       ninja
       ninja check       # Test LLVM only.
       ninja clang-test  # Test Clang only.
@@ -65,7 +65,7 @@ Finally, we want to set Clang as its own compiler.
 .. code-block:: console
 
       cd ~/clang-llvm/build
-      ccmake ../llvm
+      ccmake ../llvm-project/llvm
 
 The second command will bring up a GUI for configuring Clang. You need
 to set the entry for ``CMAKE_CXX_COMPILER``. Press ``'t'`` to turn on
@@ -89,7 +89,7 @@ live in the ``clang-tools-extra`` repository.
 
 .. code-block:: console
 
-      cd ~/clang-llvm
+      cd ~/clang-llvm/llvm-project
       mkdir clang-tools-extra/loop-convert
       echo 'add_subdirectory(loop-convert)' >> clang-tools-extra/CMakeLists.txt
       vim clang-tools-extra/loop-convert/CMakeLists.txt
@@ -314,7 +314,7 @@ handiwork:
 
 .. code-block:: console
 
-      cd ~/clang-llvm/llvm/llvm_build/
+      cd ~/clang-llvm/build/
       ninja loop-convert
       vim ~/test-files/simple-loops.cc
       bin/loop-convert ~/test-files/simple-loops.cc