From 417d8ef547f2fdaeaa70689a68f749b9f78b685a Mon Sep 17 00:00:00 2001
From: "John W. Parent" <45471568+johnwparent@users.noreply.github.com>
Date: Wed, 15 Feb 2023 12:17:32 -0500
Subject: XZ package: enable building on Windows (#35095)

* Convert XZ to multi build system
* Add MSBuild builder to XZ to support Windows compatibility
---
 var/spack/repos/builtin/packages/xz/package.py | 65 ++++++++++++++++++++++++--
 1 file changed, 62 insertions(+), 3 deletions(-)

diff --git a/var/spack/repos/builtin/packages/xz/package.py b/var/spack/repos/builtin/packages/xz/package.py
index 5dd075a2b4..49edb42497 100644
--- a/var/spack/repos/builtin/packages/xz/package.py
+++ b/var/spack/repos/builtin/packages/xz/package.py
@@ -3,12 +3,16 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
+import glob
+import os
 import re
 
+from spack.build_systems.autotools import AutotoolsBuilder
+from spack.build_systems.msbuild import MSBuildBuilder
 from spack.package import *
 
 
-class Xz(AutotoolsPackage, SourceforgePackage):
+class Xz(MSBuildPackage, AutotoolsPackage, SourceforgePackage):
     """XZ Utils is free general-purpose data compression software with
     high compression ratio. XZ Utils were written for POSIX-like systems,
     but also work on some not-so-POSIX systems. XZ Utils are the successor
@@ -44,9 +48,11 @@ class Xz(AutotoolsPackage, SourceforgePackage):
     # xz-5.2.7/src/liblzma/common/common.h:56 uses attribute __symver__ instead of
     # __asm__(.symver) for newer GCC releases.
     conflicts("%intel", when="@5.2.7", msg="icc does not support attribute __symver__")
+    conflicts("platform=windows", when="+pic")  # no pic on Windows
+    # prior to 5.2.3, build system is for MinGW only, not currently supported by Spack
+    conflicts("platform=windows", when="@:5.2.3")
 
-    def configure_args(self):
-        return self.enable_or_disable("libs")
+    build_system(conditional("msbuild", when="platform=windows"), "autotools", default="autotools")
 
     def flag_handler(self, name, flags):
         if name == "cflags" and "+pic" in self.spec:
@@ -63,7 +69,60 @@ class Xz(AutotoolsPackage, SourceforgePackage):
         match = re.search(r"xz \(XZ Utils\) (\S+)", output)
         return match.group(1) if match else None
 
+
+class AutotoolsBuilder(AutotoolsBuilder):
+    def configure_args(self):
+        return self.enable_or_disable("libs")
+
     @run_after("install")
     def darwin_fix(self):
         if self.spec.satisfies("platform=darwin"):
             fix_darwin_install_name(self.prefix.lib)
+
+
+class MSBuildBuilder(MSBuildBuilder):
+    @property
+    def build_directory(self):
+        def get_file_string_number(f):
+            s = re.findall(r"\d+$", f)
+            return (int(s[0]) if s else -1, f)
+
+        win_dir = os.path.join(super().build_directory, "windows")
+        compiler_dirs = []
+        with working_dir(win_dir):
+            for obj in os.scandir():
+                if obj.is_dir():
+                    compiler_dirs.append(obj.name)
+        newest_compiler = max(compiler_dirs, key=get_file_string_number)
+        return os.path.join(win_dir, newest_compiler)
+
+    def is_64bit(self):
+        return "64" in self.pkg.spec.target.family
+
+    def msbuild_args(self):
+        plat = "x64" if self.is_64bit() else "x86"
+        if self.pkg.spec.satisfies("libs=shared,static"):
+            f = "xz_win.sln"
+        elif self.pkg.spec.satisfies("libs=shared"):
+            f = "liblzma_dll.vcxproj"
+        else:
+            f = "liblzma.vcxproj"
+        return [self.define("Configuration", "Release"), self.define("Platform", plat), f]
+
+    def install(self, pkg, spec, prefix):
+        with working_dir(self.build_directory):
+            # Ensure we have libs directory
+            mkdirp(prefix.lib)
+            libs_to_find = []
+            if "libs=shared" in self.pkg.spec:
+                libs_to_find.extend(["*.dll", "*.lib"])
+            else:
+                libs_to_find.append("*.lib")
+            for lib in libs_to_find:
+                libs_to_install = glob.glob(
+                    os.path.join(self.build_directory, "**", lib), recursive=True
+                )
+                for library in libs_to_install:
+                    install(library, prefix.lib)
+        with working_dir(pkg.stage.source_path):
+            install_tree(os.path.join("src", "liblzma", "api"), prefix.include)
-- 
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