Mesa (master): docs: update meson docs for windows

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Module: Mesa
Branch: master
Commit: 41b3eb08d9feac97ac1be1802093ad4cc4c6ecaf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=41b3eb08d9feac97ac1be1802093ad4cc4c6ecaf

Author: Dylan Baker <dylan at pnwbakers.com>
Date:   Thu Oct 17 10:07:44 2019 -0700

docs: update meson docs for windows

Reviewed-by: Adam Jackson <ajax at redhat.com>

---

 docs/install.html | 12 ++++++++
 docs/meson.html   | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 97 insertions(+)

diff --git a/docs/install.html b/docs/install.html
index 83c5ebfb115..ec186fb84af 100644
--- a/docs/install.html
+++ b/docs/install.html
@@ -133,6 +133,18 @@ Please read the <a href="meson.html">detailed meson instructions</a>
 for more information
 </p>
 
+<p>On windows you can also use the visual studio backend</p>
+<pre>
+  meson builddir --backend=vs
+  cd builddir
+  msbuild mesa.sln /m
+</pre>
+
+<p>
+Please read the <a href="meson.html">detailed meson instructions</a>
+for more information
+</p>
+
 
 
 <h2 id="scons">3. Building with SCons (Windows/Linux)</h2>
diff --git a/docs/meson.html b/docs/meson.html
index 013ed325684..7a5d14bdf38 100644
--- a/docs/meson.html
+++ b/docs/meson.html
@@ -282,6 +282,20 @@ dependency interface.
 </p></dd>
 
 <dd><p>
+As of meson 0.51.0 meson can use cmake to find llvm (the cmake finder
+was added in meson 0.49.0, but LLVM cannot be found until 0.51) Due to the
+way LLVM implements its cmake finder it will only find static libraries, it
+will never find libllvm.so.
+
+There is also a <pre>-Dcmake_module_path</pre> option in this meson version,
+which points to the root of an alternative installation (the prefix). For
+example:
+<pre>
+        meson builddir -Dcmake_module_path=/home/user/mycmake/prefix
+</pre>
+</p></dd>
+
+<dd><p>
 As of meson 0.49.0 meson also has the concept of a
 <a href="https://mesonbuild.com/Native-environments.html">"native file"</a>,
 these files provide information about the native build environment (as opposed
@@ -325,8 +339,11 @@ should be used. It uses the same format as the native file above:
     [binaries]
     ...
     llvm-config = '/usr/lib/llvm-config-32'
+    cmake = '/usr/bin/cmake-for-my-arch'
 </pre>
 
+<p>Obviously, only cmake or llvm-config is required.</p>
+
 <p>Then configure meson:</p>
 <pre>
     meson builddir/ --cross-file cross-llvm.ini
@@ -335,6 +352,74 @@ should be used. It uses the same format as the native file above:
 See the <a href="#cross-compilation">Cross Compilation</a> section for more information.
 </dd>
 
+<dd><p>On windows (and in other cases), using llvm-config or cmake may be
+either undesirable or impossible. Meson's solution for this is a
+<a href="https://mesonbuild.com/Wrap-dependency-system-manual.html">wrap</a>, in
+this case a "binary wrap". Follow the steps below:</p>
+<ul>
+    <li>Install the binaries and headers into the <code>$mesa_src/subprojects/llvm</code></li>
+    <li>Add a meson build.build file to that directory (more on that later)</li>
+</ul>
+
+<p>The wrap file must define the following:</p>
+<ul>
+    <li><code>dep_llvm</code>: a <code>declare_dependency()</code> object with include_directories, dependencies, and version set)</li>
+</ul>
+
+<p>It may also define:</p>
+<ul>
+    <li><code>irbuilder_h</code>: a <code>files()</code> object pointing to llvm/IR/IRBuilder.h (this is requred for SWR)</li>
+    <li><code>has_rtti</code>: a <code>bool</code> that declares whether LLVM was built with RTTI. Defaults to true</li>
+</ul>
+
+<p>such a meson.build file might look like:</p>
+<pre>
+project('llvm', ['cpp'])
+
+cpp = meson.get_compiler('cpp')
+
+_deps = []
+_search = join_paths(meson.current_source_dir(), 'lib')
+foreach d : ['libLLVMCodeGen', 'libLLVMScalarOpts', 'libLLVMAnalysis',
+             'libLLVMTransformUtils', 'libLLVMCore', 'libLLVMX86CodeGen',
+             'libLLVMSelectionDAG', 'libLLVMipo', 'libLLVMAsmPrinter',
+             'libLLVMInstCombine', 'libLLVMInstrumentation', 'libLLVMMC',
+             'libLLVMGlobalISel', 'libLLVMObjectYAML', 'libLLVMDebugInfoPDB',
+             'libLLVMVectorize', 'libLLVMPasses', 'libLLVMSupport',
+             'libLLVMLTO', 'libLLVMObject', 'libLLVMDebugInfoCodeView',
+             'libLLVMDebugInfoDWARF', 'libLLVMOrcJIT', 'libLLVMProfileData',
+             'libLLVMObjCARCOpts', 'libLLVMBitReader', 'libLLVMCoroutines',
+             'libLLVMBitWriter', 'libLLVMRuntimeDyld', 'libLLVMMIRParser',
+             'libLLVMX86Desc', 'libLLVMAsmParser', 'libLLVMTableGen',
+             'libLLVMFuzzMutate', 'libLLVMLinker', 'libLLVMMCParser',
+             'libLLVMExecutionEngine', 'libLLVMCoverage', 'libLLVMInterpreter',
+             'libLLVMTarget', 'libLLVMX86AsmParser', 'libLLVMSymbolize',
+             'libLLVMDebugInfoMSF', 'libLLVMMCJIT', 'libLLVMXRay',
+             'libLLVMX86AsmPrinter', 'libLLVMX86Disassembler',
+             'libLLVMMCDisassembler', 'libLLVMOption', 'libLLVMIRReader',
+             'libLLVMLibDriver', 'libLLVMDlltoolDriver', 'libLLVMDemangle',
+             'libLLVMBinaryFormat', 'libLLVMLineEditor',
+             'libLLVMWindowsManifest', 'libLLVMX86Info', 'libLLVMX86Utils']
+  _deps += cpp.find_library(d, dirs : _search)
+endforeach
+
+dep_llvm = declare_dependency(
+  include_directories : include_directories('include'),
+  dependencies : _deps,
+  version : '6.0.0',
+)
+
+has_rtti = false
+irbuilder_h = files('include/llvm/IR/IRBuilder.h')
+</pre>
+
+<p>It is very important that version is defined and is accurate, if it is not,
+workarounds for the wrong version of LLVM might be used resulting in build
+failures.</p>
+
+</dd>
+</dl>
+
 <dt><code>PKG_CONFIG_PATH</code></dt>
 <dd><p>The
 <code>pkg-config</code> utility is a hard requirement for configuring and