build-script: Remove support for legacy way of building compiler-rt

Addresses rdar://149293315

Author: edymtt

utils/build-presets.ini

@@ -19,7 +19,7 @@ swift-install-components=back-deployment;compiler;clang-builtin-headers;libexec;
 [preset: mixin_buildbot_install_components_with_clang]
 
 swift-install-components=autolink-driver;back-deployment;compiler;clang-resource-dir-symlink;libexec;stdlib;sdk-overlay;static-mirror-lib;toolchain-tools;license;sourcekit-xpc-service;sourcekit-inproc;swift-remote-mirror;swift-remote-mirror-headers
-llvm-install-components=llvm-ar;llvm-ranlib;llvm-cov;llvm-profdata;llvm-objdump;llvm-objcopy;llvm-symbolizer;IndexStore;clang;clang-resource-headers;compiler-rt;clangd;libclang;dsymutil;LTO;clang-features-file;lld
+llvm-install-components=llvm-ar;llvm-ranlib;llvm-cov;llvm-profdata;llvm-objdump;llvm-objcopy;llvm-symbolizer;IndexStore;clang;clang-resource-headers;builtins;runtimes;clangd;libclang;dsymutil;LTO;clang-features-file;lld
 
 [preset: mixin_buildbot_trunk_base]
 # Build standard library and SDK overlay for iOS device and simulator.
@@ -848,7 +848,7 @@ no-swift-stdlib-assertions
 [preset: mixin_linux_install_components_with_clang]
 
 swift-install-components=autolink-driver;compiler;clang-resource-dir-symlink;libexec;stdlib;swift-remote-mirror;sdk-overlay;static-mirror-lib;toolchain-tools;license;sourcekit-inproc
-llvm-install-components=llvm-ar;llvm-ranlib;llvm-cov;llvm-profdata;llvm-objdump;llvm-objcopy;llvm-symbolizer;IndexStore;clang;clang-resource-headers;compiler-rt;clangd;libclang;lld;LTO;clang-features-file
+llvm-install-components=llvm-ar;llvm-ranlib;llvm-cov;llvm-profdata;llvm-objdump;llvm-objcopy;llvm-symbolizer;IndexStore;clang;clang-resource-headers;builtins;runtimes;clangd;libclang;lld;LTO;clang-features-file
 
 [preset: mixin_linux_installation]
 mixin-preset=
@@ -3029,7 +3029,7 @@ darwin-toolchain-display-name-short=Swift Development Snapshot
 darwin-toolchain-display-name=Swift Development Snapshot
 darwin-toolchain-name=swift-DEVELOPMENT-SNAPSHOT
 darwin-toolchain-version=3.999.999
-llvm-install-components=clang;clang-resource-headers;compiler-rt;libclang;libclang-headers;dsymutil;clang-features-file
+llvm-install-components=clang;clang-resource-headers;builtins;runtimes;libclang;libclang-headers;dsymutil;clang-features-file
 swift-install-components=back-deployment;compiler;clang-builtin-headers;stdlib;libexec;sdk-overlay;license;sourcekit-xpc-service;sourcekit-inproc;swift-remote-mirror;swift-remote-mirror-headers
 symbols-package=%(symbols_package)s
 install-symroot=%(install_symroot)s
@@ -3186,7 +3186,7 @@ build-subdir=%(build_subdir)s
 install-destdir=%(install_destdir)s
 
 swift-install-components=autolink-driver;compiler;clang-resource-dir-symlink;stdlib;sdk-overlay;toolchain-tools
-llvm-install-components=llvm-ar;llvm-ranlib;clang;clang-resource-headers;compiler-rt;clang-features-file;llvm-symbolizer
+llvm-install-components=llvm-ar;llvm-ranlib;clang;clang-resource-headers;builtins;runtimes;clang-features-file;llvm-symbolizer
 
 install-llvm
 install-swift
@@ -3218,7 +3218,7 @@ extra-cmake-options=
   -DLLVM_TARGETS_TO_BUILD=AArch64;X86
 
 swift-install-components=autolink-driver;compiler;clang-resource-dir-symlink;stdlib;sdk-overlay;toolchain-tools;license
-llvm-install-components=llvm-ar;llvm-ranlib;clang;clang-resource-headers;compiler-rt;clang-features-file;lld
+llvm-install-components=llvm-ar;llvm-ranlib;clang;clang-resource-headers;builtins;runtimes;clang-features-file;lld
 
 build-subdir=%(build_subdir)s
 install-destdir=%(install_destdir)s
@@ -3256,7 +3256,7 @@ build-subdir=%(build_subdir)s
 install-destdir=%(install_destdir)s
 
 swift-install-components=autolink-driver;compiler;clang-resource-dir-symlink;stdlib;sdk-overlay;toolchain-tools;license
-llvm-install-components=llvm-ar;llvm-ranlib;clang;clang-resource-headers;compiler-rt;clang-features-file;lld
+llvm-install-components=llvm-ar;llvm-ranlib;clang;clang-resource-headers;builtins;runtimes;clang-features-file;lld
 
 install-llvm
 install-swift

utils/build_swift/build_swift/driver_arguments.py

@@ -1437,11 +1437,6 @@ def create_argument_parser():
                 'existing options.',
            default=[])
 
-    option('--llvm-build-compiler-rt-with-use-runtimes', toggle_true, default=True,
-           help='Switch to LLVM_ENABLE_RUNTIMES as the mechanism to build compiler-rt'
-                'It will become the default with LLVM 21, this flag is '
-                'meant to stage its introduction and account for edge cases')
-
     # -------------------------------------------------------------------------
     in_group('Build settings for Android')
 

utils/build_swift/tests/expected_options.py

@@ -234,7 +234,6 @@
     'lldb_build_variant': 'Debug',
     'lldb_build_with_xcode': '0',
     'llvm_assertions': True,
-    'llvm_build_compiler_rt_with_use_runtimes': True,
     'llvm_build_variant': 'Debug',
     'llvm_cmake_options': [],
     'llvm_enable_modules': False,
@@ -865,7 +864,6 @@ class BuildScriptImplOption(_BaseOption):
     AppendOption('--llvm-ninja-targets-for-cross-compile-hosts'),
     AppendOption('--llvm-cmake-options'),
     AppendOption('--extra-llvm-cmake-options'),
-    EnableOption('--llvm-build-compiler-rt-with-use-runtimes'),
     AppendOption('--darwin-symroot-path-filters'),
 
     UnsupportedOption('--build-jobs'),

utils/swift_build_support/swift_build_support/products/llvm.py

@@ -356,9 +356,6 @@ def build(self, host_target):
 
         if self.args.build_embedded_stdlib and system() == "Darwin":
             # Ask for Mach-O cross-compilation builtins (for Embedded Swift)
-            llvm_cmake_options.define(
-                'COMPILER_RT_FORCE_BUILD_BAREMETAL_MACHO_BUILTINS_ARCHS:STRING',
-                'armv6 armv6m armv7 armv7m armv7em')
             llvm_cmake_options.define(
                 f'BUILTINS_{builtins_runtimes_target_for_darwin}_'
                 'COMPILER_RT_FORCE_BUILD_BAREMETAL_MACHO_BUILTINS_ARCHS:'
@@ -369,28 +366,13 @@ def build(self, host_target):
 
         if self.args.build_compiler_rt and \
                 not self.is_cross_compile_target(host_target):
-            if self.args.llvm_build_compiler_rt_with_use_runtimes:
-                llvm_enable_runtimes.append('compiler-rt')
-                # This accounts for previous incremental runs that may have set
-                # those in the LLVM CMakeCache.txt
-                llvm_cmake_options.undefine('LLVM_TOOL_COMPILER_RT_BUILD')
-                llvm_cmake_options.undefine('LLVM_BUILD_EXTERNAL_COMPILER_RT')
-            else:
-                # No need to unset anything,
-                # since we set LLVM_ENABLE_RUNTIMES explicitly
-                llvm_enable_projects.append('compiler-rt')
-                llvm_cmake_options.define(
-                    'LLVM_TOOL_COMPILER_RT_BUILD:BOOL', 'TRUE')
-                llvm_cmake_options.define(
-                    'LLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL', 'TRUE')
-        else:
-            if not self.args.llvm_build_compiler_rt_with_use_runtimes:
-                # No need to unset anything,
-                # since we set LLVM_ENABLE_RUNTIMES explicitly
-                llvm_cmake_options.define(
-                    'LLVM_TOOL_COMPILER_RT_BUILD:BOOL', 'FALSE')
-                llvm_cmake_options.define(
-                    'LLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL', 'FALSE')
+            llvm_enable_runtimes.append('compiler-rt')
+
+        # This accounts for previous incremental runs using the old
+        # way of build compiler_rt that may have set
+        # those in the LLVM CMakeCache.txt
+        llvm_cmake_options.undefine('LLVM_TOOL_COMPILER_RT_BUILD')
+        llvm_cmake_options.undefine('LLVM_BUILD_EXTERNAL_COMPILER_RT')
 
         if self.args.build_clang_tools_extra:
             llvm_enable_projects.append('clang-tools-extra')
@@ -572,10 +554,9 @@ def install(self, host_target):
            self.args.llvm_install_components != 'all':
             install_targets = []
             components = self.args.llvm_install_components.split(';')
-            if self.args.llvm_build_compiler_rt_with_use_runtimes and \
-               'compiler-rt' in components:
+            if 'compiler-rt' in components:
                 # This is a courtesy fallback to avoid breaking downstream presets
-                # we are not aware of
+                # that are still using the old compiler-rt install component
                 components.remove('compiler-rt')
                 components.append('builtins')
                 components.append('runtimes')
@@ -586,7 +567,7 @@ def install(self, host_target):
             for component in components:
                 if self.is_cross_compile_target(host_target) \
                    or not self.args.build_compiler_rt:
-                    if component in ['compiler-rt', 'builtins', 'runtimes']:
+                    if component in ['builtins', 'runtimes']:
                         continue
                 install_targets.append('install-{}'.format(component))