From 257ef70157d92e10cd4043fad7502ba137944b15 Mon Sep 17 00:00:00 2001
From: Arnold Schwaighofer <aschwaighofer@apple.com>
Date: Thu, 22 Aug 2019 14:00:51 -0700
Subject: [PATCH] Revert "Linux: Build CMake if the checked out version is
 newer than the installed version."

---
 utils/build-script                            |  7 --
 .../swift_build_support/cmake.py              | 96 -------------------
 2 files changed, 103 deletions(-)

diff --git a/utils/build-script b/utils/build-script
index 4c6c954e4ff97..7c538c1da2574 100755
--- a/utils/build-script
+++ b/utils/build-script
@@ -1042,13 +1042,6 @@ def main_normal():
     if args.cmake is not None:
         toolchain.cmake = args.cmake
 
-    cmake = CMake(args=args, toolchain=toolchain)
-    # Check the CMake version is sufficient on Linux and build from source if not.
-    cmake_path = cmake.check_cmake_version(SWIFT_SOURCE_ROOT, SWIFT_BUILD_ROOT)
-    if cmake_path is not None:
-        toolchain.cmake = cmake_path
-        args.cmake = cmake_path
-
     # Preprocess the arguments to apply defaults.
     BuildScriptInvocation.apply_default_arguments(toolchain, args)
 
diff --git a/utils/swift_build_support/swift_build_support/cmake.py b/utils/swift_build_support/swift_build_support/cmake.py
index d2c422f225b47..3b29646ddbf17 100644
--- a/utils/swift_build_support/swift_build_support/cmake.py
+++ b/utils/swift_build_support/swift_build_support/cmake.py
@@ -20,10 +20,6 @@
 
 from . import shell
 
-import re
-import os
-import platform
-
 
 class CMakeOptions(object):
     """List like object used to define cmake options
@@ -181,95 +177,3 @@ def build_args(self):
                            '-jobs', str(jobs)]
 
         return build_args
-
-    # Determine the version of the installed CMake binary.
-    def installed_cmake_version(self, cmake_binary):
-        version = shell.capture([cmake_binary, '--version'], dry_run=False,
-                                    echo=True, optional=True)
-        (c_major, c_minor, c_patch) = (0, 0, 0)
-        if version is not None:
-            x = re.findall(r'cmake version (\d+)\.(\d+)\.(\d+)', version.rstrip())
-            if len(x) == 1:
-                (c_major, c_minor, c_patch) = map(int, x[0])
-
-        return (c_major, c_minor, c_patch)
-
-    # Determine the version of the checked out CMake source.
-    def cmake_source_version(self, cmake_source_dir):
-        cmake_version_file = os.path.join(cmake_source_dir, 'Source',
-                                              'CMakeVersion.cmake')
-        major = -1
-        minor = -1
-        patch = -1
-
-        file = open(cmake_version_file, "r")
-        for line in file.readlines():
-            m = re.findall(r'set\(CMake_VERSION_MAJOR (\d+)\)', line)
-            if len(m) == 1:
-                major = int(m[0])
-                continue
-
-            m = re.findall(r'set\(CMake_VERSION_MINOR (\d+)\)', line)
-            if len(m) == 1:
-                minor = int(m[0])
-                continue
-
-            m = re.findall(r'set\(CMake_VERSION_PATCH (\d+)\)', line)
-            if len(m) == 1:
-                patch = int(m[0])
-                continue
-
-        if major == -1 or minor == -1 or patch == -1:
-            raise RuntimeError("Cant determine CMake version from %s"
-                                   % cmake_version_file)
-
-        return (major, minor, patch)
-
-    # Build CMake from source.
-    def build_cmake(self, source_root, build_root):
-        cmake_bootstrap = os.path.join(source_root, 'cmake', 'bootstrap')
-
-        if hasattr(self.args, 'build_script_impl_args'):
-            for opt in self.args.build_script_impl_args:
-                m = re.findall('--build-dir=(.*)', opt)
-                if len(m) == 1:
-                    build_root = m[0]
-
-        cmake_build_dir = os.path.join(build_root, 'cmake-%s' % self.args.host_target)
-        if not os.path.isdir(cmake_build_dir):
-            os.makedirs(cmake_build_dir)
-
-        cwd = os.getcwd()
-        os.chdir(cmake_build_dir)
-        shell.call_without_sleeping([cmake_bootstrap], echo=True)
-        shell.call_without_sleeping(['make', '-j%s' % self.args.build_jobs],
-                                        echo=True)
-        os.chdir(cwd)
-        return os.path.join(cmake_build_dir, 'bin', 'cmake')
-
-    # For Linux only, determine the version of the installed CMake compared to the
-    # source and build the source if necessary. Returns the path to the cmake binary.
-    def check_cmake_version(self, source_root, build_root):
-        if platform.system() != 'Linux':
-            return
-
-        cmake_source_dir = os.path.join(source_root, 'cmake')
-        # If the source is not checked out then don't attempt to build anything.
-        if not os.path.isdir(cmake_source_dir):
-            return
-
-        cmake_binary = 'cmake'
-        try:
-            if self.args.cmake is not None:
-                cmake_binary = self.args.cmake
-        except AttributeError:
-            cmake_binary = 'cmake'
-
-        (i_major, i_minor, i_patch) = self.installed_cmake_version(cmake_binary)
-        (s_major, s_minor, s_patch) = self.cmake_source_version(cmake_source_dir)
-        if (i_major > s_major or (i_major == s_major and i_minor >= s_minor) or
-            (i_major == s_major and i_minor == s_minor and i_patch >= s_patch)):
-            return
-        else:
-            # Build CMake from source and return the path to the executable.
-            return self.build_cmake(source_root, build_root)