Rewrite the CMake build system

Swift SVN r24124

utils/SwiftBuildSupport.py

@@ -0,0 +1,126 @@
+#===--- SwiftBuildSupport.py - Utilities for Swift build scripts -----------===#
+#
+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See http://swift.org/LICENSE.txt for license information
+# See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+#
+#===------------------------------------------------------------------------===#
+
+from __future__ import print_function
+
+import ConfigParser
+import os
+import pipes
+import subprocess
+import sys
+
+
+HOME = os.environ["HOME"]
+
+
+# Set SWIFT_SOURCE_ROOT in your environment to control where the sources
+# are found.
+SWIFT_SOURCE_ROOT = os.environ.get(
+    "SWIFT_SOURCE_ROOT", os.path.join(HOME, "src", "s"))
+
+
+# Set SWIFT_BUILD_ROOT to a directory that will contain a subdirectory
+# for each build configuration
+SWIFT_BUILD_ROOT = os.environ.get(
+    "SWIFT_BUILD_ROOT", os.path.join(HOME, "build", "swift"))
+
+
+def print_with_argv0(message):
+    print(sys.argv[0] + ": " + message)
+
+
+def bad_usage(message):
+    print_with_argv0(message)
+    print("Run '" + pipes.quote(sys.argv[0]) + " --help' for more information.")
+    sys.exit(1)
+
+
+def quote_shell_command(args):
+    return " ".join([ pipes.quote(a) for a in args ])
+
+
+def check_call(args, verbose=False):
+    try:
+        return subprocess.check_call(args)
+    except:
+        if verbose:
+            print_with_argv0("failed command: " + quote_shell_command(args))
+        else:
+            print_with_argv0("command terminated with a non-zero exit status, aborting build")
+        sys.stdout.flush()
+        sys.exit(1)
+
+
+def check_output(args, verbose=False):
+    try:
+        return subprocess.check_output(args)
+    except:
+        if verbose:
+            print_with_argv0("failed command: " + quote_shell_command(args))
+        else:
+            print_with_argv0("command terminated with a non-zero exit status, aborting build")
+        sys.stdout.flush()
+        sys.exit(1)
+
+
+def get_preset_options_impl(config, substitutions, preset_name):
+    section_name = "preset: " + preset_name
+    if section_name not in config.sections():
+        return (None, None)
+
+    build_script_opts = []
+    build_script_impl_opts = []
+    dash_dash_seen = False
+    for o, a in config.items(section_name):
+        if o in substitutions:
+            continue
+
+        opt = None
+        if o == "mixin-preset":
+            # Split on newlines and filter out empty lines.
+            mixins = filter(None, [m.strip() for m in a.splitlines()])
+            for mixin in mixins:
+                (base_build_script_opts, base_build_script_impl_opts) = \
+                    get_preset_options_impl(config, substitutions, mixin)
+                build_script_opts += base_build_script_opts
+                build_script_impl_opts += base_build_script_impl_opts
+        elif o == "dash-dash":
+            dash_dash_seen = True
+        elif a == "":
+            opt = "--" + o
+        else:
+            opt = "--" + o + "=" + a
+
+        if opt:
+            if not dash_dash_seen:
+                build_script_opts.append(opt)
+            else:
+                build_script_impl_opts.append(opt)
+    return (build_script_opts, build_script_impl_opts)
+
+
+def get_preset_options(substitutions, preset_file_names, preset_name):
+    config = ConfigParser.SafeConfigParser(substitutions, allow_no_value=True)
+    if config.read(preset_file_names) == []:
+        print_with_argv0(
+            "preset file not found (tried " + str(preset_file_names) + ")")
+        sys.exit(1)
+
+    (build_script_opts, build_script_impl_opts) = \
+        get_preset_options_impl(config, substitutions, preset_name)
+    if build_script_opts is None:
+        print_with_argv0("preset '" + preset_name + "'not found")
+        sys.exit(1)
+
+    return build_script_opts + [ "--" ] + build_script_impl_opts
+
+