[Build] Move the .cfg file generation to a new product.

We need to move the `.cfg` file generation to a new product so that we can
land it in the default toolchain for Xcode.

rdar://128612098

Author: al45tair

utils/build-presets.ini

@@ -37,6 +37,7 @@ build-ninja
 build-swift-stdlib-unittest-extra
 
 install-llvm
+install-static-linux-config
 install-swift
 install-swiftsyntax
 
@@ -394,6 +395,7 @@ skip-test-watchos
 skip-test-xros
 
 install-llvm
+install-static-linux-config
 install-swift
 install-llbuild
 install-swiftpm
@@ -618,6 +620,7 @@ sourcekit-lsp
 # Failing to build in CI: rdar://78408440
 # swift-inspect
 install-llvm
+install-static-linux-config
 install-swift
 install-llbuild
 install-swiftpm
@@ -839,6 +842,7 @@ swiftformat
 
 build-ninja
 install-llvm
+install-static-linux-config
 install-swift
 install-lldb
 install-llbuild
@@ -993,6 +997,7 @@ host-test
 
 install-prefix=/usr
 install-llvm
+install-static-linux-config
 install-swift
 install-swiftsyntax
 
@@ -1107,6 +1112,7 @@ xctest
 build-subdir=buildbot_linux
 
 install-llvm
+install-static-linux-config
 install-swift
 install-lldb
 install-llbuild
@@ -1178,6 +1184,7 @@ swiftformat
 indexstore-db
 sourcekit-lsp
 install-llvm
+install-static-linux-config
 install-swift
 install-llbuild
 install-libicu
@@ -1220,6 +1227,7 @@ build-subdir=buildbot_incremental_tsan_libdispatch_test
 llvm-cmake-options=-DLLVM_INSTALL_UTILS=ON
 llvm-install-components=all
 install-llvm
+install-static-linux-config
 
 libdispatch-cmake-options=-DENABLE_SWIFT=OFF
 libdispatch
@@ -1344,6 +1352,7 @@ extra-cmake-options=
 extra-dsymutil-args="--verify-dwarf=none"
 
 install-llvm
+install-static-linux-config
 install-swift
 install-lldb
 install-llbuild
@@ -1631,6 +1640,7 @@ libcxx
 
 # Install swift and libcxx
 install-llvm
+install-static-linux-config
 install-swift
 install-swiftsyntax
 
@@ -1685,6 +1695,7 @@ swiftsyntax-verify-generated-files
 indexstore-db
 sourcekit-lsp
 install-llvm
+install-static-linux-config
 install-swift
 install-llbuild
 install-swiftpm
@@ -1771,6 +1782,7 @@ llbuild
 swiftpm
 
 install-llvm
+install-static-linux-config
 install-swift
 install-llbuild
 install-swiftpm
@@ -2089,6 +2101,7 @@ install-libdispatch
 install-libicu
 install-libcxx
 install-llvm
+install-static-linux-config
 install-swift
 install-llbuild
 install-swiftpm
@@ -2128,6 +2141,7 @@ skip-build-llvm
 skip-build-llbuild
 skip-build-benchmarks
 install-llvm
+install-static-linux-config
 install-swift
 install-swiftsyntax
 install-prefix=%(install_toolchain_dir)s/usr
@@ -2889,6 +2903,7 @@ swiftpm
 swift-driver
 install-llbuild
 install-llvm
+install-static-linux-config
 install-swift
 install-swiftpm
 install-swift-driver

utils/build_swift/build_swift/driver_arguments.py

@@ -729,6 +729,9 @@ def create_argument_parser():
     option(['--install-swiftpm'], toggle_true('install_swiftpm'),
            help='install swiftpm')
 
+    option(['--install-static-linux-config'], toggle_true,
+           help='install static-linux config files for Clang')
+
     option(['--swiftsyntax'], toggle_true('build_swiftsyntax'),
            help='build swiftSyntax')
 

utils/build_swift/tests/expected_options.py

@@ -107,6 +107,7 @@
     'build_sourcekitlsp': False,
     'sourcekitlsp_lint': False,
     'install_llvm': False,
+    'install_static_linux_config": False,
     'install_swiftpm': False,
     'install_swiftsyntax': False,
     'install_swift_driver': False,
@@ -639,6 +640,7 @@ class BuildScriptImplOption(_BaseOption):
     EnableOption('--sourcekit-lsp-lint',
                  dest='sourcekitlsp_lint'),
     EnableOption('--install-llvm', dest='install_llvm'),
+    EnableOption('--install-static-linux-config', dest='install_static_linux_config'),
     EnableOption('--install-swiftsyntax', dest='install_swiftsyntax'),
     EnableOption('--swiftsyntax-verify-generated-files',
                  dest='swiftsyntax_verify_generated_files'),

utils/swift_build_support/swift_build_support/products/__init__.py

@@ -28,6 +28,7 @@
 from .playgroundsupport import PlaygroundSupport
 from .skstresstester import SKStressTester
 from .sourcekitlsp import SourceKitLSP
+from .staticswiftlinux import StaticSwiftLinuxConfig
 from .swift import Swift
 from .swiftdocc import SwiftDocC
 from .swiftdoccrender import SwiftDocCRender
@@ -59,6 +60,7 @@
     'MinimalStdlib',
     'Ninja',
     'PlaygroundSupport',
+    'StaticSwiftLinuxConfig',
     'Swift',
     'SwiftFormat',
     'SwiftInspect',

utils/swift_build_support/swift_build_support/products/llvm.py

@@ -199,35 +199,6 @@ def copy_embedded_compiler_rt_builtins_from_darwin_host_toolchain(
                         elif self.args.verbose_build:
                             print('no file exists at {}'.format(host_lib_path))
 
-    def install_static_linux_config(self, arch, bin_dir):
-        """Install the .cfg files to set the relevant Clang options for the
-        fully static Linux SDK's <arch>-swift-linux-musl triple.
-
-        Doing it this way means it's easier to modify the defaults without
-        having to change the compiler driver."""
-
-        try:
-            os.makedirs(bin_dir)
-        except FileExistsError:
-            pass
-
-        musl_cfg = os.path.join(bin_dir, f'{arch}-swift-linux-musl-clang.cfg')
-        with open(musl_cfg, "wt") as f:
-            f.write(f"""
--target {arch}-swift-linux-musl
--rtlib=compiler-rt
--stdlib=libc++
--fuse-ld=lld
--unwindlib=libunwind
--lc++abi
--static
-            """)
-        for name in (f'{arch}-swift-linux-musl-clang++.cfg', ):
-            try:
-                os.symlink(musl_cfg, os.path.join(bin_dir, name))
-            except FileExistsError:
-                pass
-
     def should_build(self, host_target):
         """should_build() -> Bool
 
@@ -382,10 +353,6 @@ def build(self, host_target):
         host_build_dir = os.path.join(build_root, 'llvm-{}'.format(
             host_machine_target))
 
-        # Install config files for linux-static
-        bin_dir = os.path.join(host_build_dir, 'bin')
-        self.install_static_linux_config(arch, bin_dir)
-
         if self.is_cross_compile_target(host_target):
             build_root = os.path.dirname(self.build_dir)
             host_machine_target = targets.StdlibDeploymentTarget.host_target().name
@@ -523,10 +490,6 @@ def install(self, host_target):
         clang_dest_dir = '{}{}'.format(host_install_destdir,
                                        self.args.install_prefix)
 
-        bin_dir = os.path.join(clang_dest_dir, 'bin')
-        for arch in self.args.linux_static_archs:
-            self.install_static_linux_config(arch, bin_dir)
-
         if self.args.llvm_install_components and system() == 'Darwin':
             self.copy_embedded_compiler_rt_builtins_from_darwin_host_toolchain(
                 clang_dest_dir)

utils/swift_build_support/swift_build_support/products/staticswiftlinux.py

@@ -0,0 +1,119 @@
+# swift_build_support/products/staticswiftlinux.py --------------*- python -*-
+#
+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+#
+# ----------------------------------------------------------------------------
+
+from . import product
+
+class StaticSwiftLinuxConfig(product.Product):
+
+    @classmethod
+    def is_build_script_impl_product(cls):
+        """is_build_script_impl_product -> bool
+
+        Whether this product is produced by build-script-impl.
+        """
+        return False
+
+    @classmethod
+    def is_before_build_script_impl_product(cls):
+        """is_before_build_script_impl_product -> bool
+
+        Whether this product is built before any build-script-impl products.
+        Such products must be non-build_script_impl products.
+        Because such products are built ahead of the compiler, they are
+        built using the host toolchain.
+        """
+        return False
+
+    @classmethod
+    def get_dependencies(cls):
+        """Return a list of products that this product depends upon"""
+        return []
+
+    def install_static_linux_config(self, arch, bin_dir):
+        """Install the .cfg files to set the relevant Clang options for the
+        fully static Linux SDK's <arch>-swift-linux-musl triple.
+
+        Doing it this way means it's easier to modify the defaults without
+        having to change the compiler driver."""
+
+        try:
+            os.makedirs(bin_dir)
+        except FileExistsError:
+            pass
+
+        musl_cfg = os.path.join(bin_dir, f'{arch}-swift-linux-musl-clang.cfg')
+        with open(musl_cfg, "wt") as f:
+            f.write(f"""
+-target {arch}-swift-linux-musl
+-rtlib=compiler-rt
+-stdlib=libc++
+-fuse-ld=lld
+-unwindlib=libunwind
+-lc++abi
+-static
+            """)
+        for name in (f'{arch}-swift-linux-musl-clang++.cfg', ):
+            try:
+                os.symlink(musl_cfg, os.path.join(bin_dir, name))
+            except FileExistsError:
+                pass
+
+    def clean(self, host_target):
+        """clean() -> void
+
+        Perform the clean, for a non-build-script-impl product.
+        """
+        pass
+
+    def build(self, host_target):
+        """build() -> void
+
+        Perform the build, for a non-build-script-impl product.
+        """
+        pass
+
+    def should_test(self, host_target):
+        """should_test() -> Bool
+
+        Whether or not this product should be tested with the given arguments.
+        """
+        return False
+
+    def test(self, host_target):
+        """test() -> void
+
+        Run the tests, for a non-build-script-impl product.
+        """
+        pass
+
+    def should_install(self, host_target):
+        """should_install() -> Bool
+
+        Whether or not this product should be installed with the given
+        arguments.
+        """
+        return self.args.install_static_linux_config
+
+    def install(self, host_target):
+        """install() -> void
+
+        Install to the toolchain, for a non-build-script-impl product.
+        """
+        host_install_destdir = self.host_install_destdir(host_target)
+
+        clang_dest_dir = '{}{}'.format(host_install_destdir,
+                                       self.args.install_prefix)
+
+        bin_dir = os.path.join(clang_dest_dir, 'bin')
+        for arch in self.args.linux_static_archs:
+            self.install_static_linux_config(arch, bin_dir)
+

utils/swift_build_support/swift_build_support/products/swift.py

@@ -14,6 +14,7 @@
 from . import earlyswiftdriver
 from . import libcxx
 from . import llvm
+from . import staticswiftlinux
 from . import product
 from ..cmake import CMakeOptions
 
@@ -265,4 +266,5 @@ def get_dependencies(cls):
         return [cmark.CMark,
                 earlyswiftdriver.EarlySwiftDriver,
                 llvm.LLVM,
+                staticswiftlinux.StaticSwiftLinuxConfig,
                 libcxx.LibCXX]