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build-script: Permit to build compiler-rt with LLVM_ENABLE_RUNTIMES #80174

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Apr 22, 2025
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build-script: Permit to build compiler-rt with LLVM_ENABLE_RUNTIMES #80174

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14 changes: 0 additions & 14 deletions utils/build-script-impl
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Original file line number Diff line number Diff line change
Expand Up @@ -803,20 +803,6 @@ function set_build_options_for_host() {
esac


# We don't currently support building compiler-rt for cross-compile targets.
# It's not clear that's useful anyway.
if [[ $(is_cross_tools_host "${host}") ]] ; then
llvm_cmake_options+=(
-DLLVM_TOOL_COMPILER_RT_BUILD:BOOL=FALSE
-DLLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL=FALSE
)
else
llvm_cmake_options+=(
-DLLVM_TOOL_COMPILER_RT_BUILD:BOOL="$(false_true ${SKIP_BUILD_COMPILER_RT})"
-DLLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL="$(false_true ${SKIP_BUILD_COMPILER_RT})"
)
fi

# If we are asked to not generate test targets for LLVM and or Swift,
# disable as many LLVM tools as we can. This improves compile time when
# compiling with LTO.
Expand Down
2 changes: 2 additions & 0 deletions utils/build_swift/build_swift/defaults.py
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Expand Up @@ -122,6 +122,8 @@ def llvm_install_components():
"""Convenience function for getting the default llvm install components for
platforms.
"""
# llvm build product will take care of replacing compiler-rt with
# builtins,runtimes if need be
components = ['llvm-ar', 'llvm-cov', 'llvm-profdata', 'IndexStore', 'clang',
'clang-resource-headers', 'compiler-rt', 'clangd', 'LTO',
'lld']
Expand Down
5 changes: 5 additions & 0 deletions utils/build_swift/build_swift/driver_arguments.py
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Expand Up @@ -1398,6 +1398,11 @@ def create_argument_parser():
'separated options "-DCMAKE_VAR1=YES,-DCMAKE_VAR2=/tmp". Can '
'be called multiple times to add multiple such options.')

option('--llvm-build-compiler-rt-with-use-runtimes', toggle_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')

Expand Down
2 changes: 2 additions & 0 deletions utils/build_swift/tests/expected_options.py
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Expand Up @@ -232,6 +232,7 @@
'lldb_build_variant': 'Debug',
'lldb_build_with_xcode': '0',
'llvm_assertions': True,
'llvm_build_compiler_rt_with_use_runtimes': False,
'llvm_build_variant': 'Debug',
'llvm_cmake_options': [],
'llvm_enable_modules': False,
Expand Down Expand Up @@ -853,6 +854,7 @@ class BuildScriptImplOption(_BaseOption):
AppendOption('--llvm-ninja-targets'),
AppendOption('--llvm-ninja-targets-for-cross-compile-hosts'),
AppendOption('--llvm-cmake-options'),
EnableOption('--llvm-build-compiler-rt-with-use-runtimes'),
AppendOption('--darwin-symroot-path-filters'),

UnsupportedOption('--build-jobs'),
Expand Down
20 changes: 6 additions & 14 deletions utils/swift_build_support/swift_build_support/products/cmake_product.py
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Expand Up @@ -133,6 +133,7 @@ def host_cmake_options(self, host_target):

llvm_target_arch = None
cmake_osx_deployment_target = None
cmake_os_sysroot = None
swift_host_triple = None
swift_host_variant = platform
swift_host_variant_sdk = platform.upper()
Expand Down Expand Up @@ -381,19 +382,6 @@ def host_cmake_options(self, host_target):
# in the compiler checks CMake performs
swift_cmake_options.define('CMAKE_OSX_ARCHITECTURES', arch)

# We don't currently support building compiler-rt for cross-compile targets.
# It's not clear that's useful anyway.
if self.is_cross_compile_target(host_target):
llvm_cmake_options.define('LLVM_TOOL_COMPILER_RT_BUILD:BOOL', 'FALSE')
llvm_cmake_options.define('LLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL', 'FALSE')
else:
llvm_cmake_options.define('LLVM_TOOL_COMPILER_RT_BUILD:BOOL',
cmake.CMakeOptions.true_false(
self.args.build_compiler_rt))
llvm_cmake_options.define('LLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL',
cmake.CMakeOptions.true_false(
self.args.build_compiler_rt))

# If we are asked to not generate test targets for LLVM and or Swift,
# disable as many LLVM tools as we can. This improves compile time when
# compiling with LTO.
Expand Down Expand Up @@ -428,4 +416,8 @@ def host_cmake_options(self, host_target):

llvm_cmake_options.define('COVERAGE_DB', self.args.coverage_db)

return (llvm_cmake_options, swift_cmake_options)
# This provides easier access to certain settings
# users may need without having to use CMakeOptions interface
relevant_options = {'CMAKE_OSX_SYSROOT': cmake_os_sysroot}

return (llvm_cmake_options, swift_cmake_options, relevant_options)
97 changes: 83 additions & 14 deletions utils/swift_build_support/swift_build_support/products/llvm.py
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Expand Up @@ -225,7 +225,7 @@ def build(self, host_target):

(platform, arch) = host_target.split('-')

llvm_cmake_options = self.host_cmake_options(host_target)[0]
llvm_cmake_options, _, relevant_options = self.host_cmake_options(host_target)
llvm_cmake_options.extend_raw(self.args.llvm_cmake_options)

# TODO: handle cross compilation
Expand Down Expand Up @@ -291,18 +291,78 @@ def build(self, host_target):
llvm_cmake_options.define('LLVM_INCLUDE_DOCS:BOOL', 'TRUE')
llvm_cmake_options.define('LLVM_ENABLE_LTO:STRING', self.args.lto_type)
llvm_cmake_options.define('COMPILER_RT_INTERCEPT_LIBDISPATCH', 'ON')
# Swift expects the old layout for the runtime directory
# updating this in tracked in #80180
llvm_cmake_options.define('LLVM_ENABLE_PER_TARGET_RUNTIME_DIR', 'OFF')
if host_target.startswith('linux'):
# This preserves the behaviour we had when using
# LLVM_BUILD_EXTERNAL COMPILER_RT --
# that is, having the linker not complaing if symbols used
# by TSan are undefined (namely the ones for Blocks Runtime)
# In the long term, we want to remove this and
# build Blocks Runtime before LLVM
llvm_cmake_options.define(
'SANITIZER_COMMON_LINK_FLAGS:STRING', '-Wl,-z,undefs')

builtins_runtimes_target_for_darwin = 'arm64-apple-darwin'
if system() == "Darwin":
llvm_cmake_options.define(
f'BUILTINS_{builtins_runtimes_target_for_darwin}_'
'CMAKE_OSX_SYSROOT',
relevant_options['CMAKE_OSX_SYSROOT'])
llvm_cmake_options.define(
f'RUNTIMES_{builtins_runtimes_target_for_darwin}_'
'CMAKE_OSX_SYSROOT',
relevant_options['CMAKE_OSX_SYSROOT'])
llvm_cmake_options.define(
'LLVM_BUILTIN_TARGETS', builtins_runtimes_target_for_darwin)
llvm_cmake_options.define(
'LLVM_RUNTIME_TARGETS', builtins_runtimes_target_for_darwin)
llvm_cmake_options.define('RUNTIMES_BUILD_ALLOW_DARWIN', 'ON')
# Build all except rtsan
llvm_cmake_options.define(
f'RUNTIMES_{builtins_runtimes_target_for_darwin}_'
'COMPILER_RT_SANITIZERS_TO_BUILD',
'asan;dfsan;msan;hwasan;tsan;safestack;cfi;scudo_standalone;'
'ubsan_minimal;gwp_asan;nsan;asan_abi')

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:'
'STRING', 'armv6 armv6m armv7 armv7m armv7em')

llvm_enable_projects = ['clang']
llvm_enable_runtimes = []

if self.args.build_compiler_rt and \
not self.is_cross_compile_target(host_target):
llvm_enable_projects.append('compiler-rt')
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')

if self.args.build_clang_tools_extra:
llvm_enable_projects.append('clang-tools-extra')
Expand All @@ -316,18 +376,15 @@ def build(self, host_target):
if self.args.build_lld:
llvm_enable_projects.append('lld')

if self.args.test:
# LLVMTestingSupport is not built at part of `all`
# and is required by some Swift tests
build_targets.append('LLVMTestingSupport')
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This seems unrelated to this change?

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@edymtt edymtt Mar 20, 2025 •
edited
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This is needed because with LLVM_ENABLE_RUNTIMES the new runtimes target does not have any dependencies to LLVMTestingSupport -- currently that is scheduled as a result of the compiler-rt configuration

I preferred to apply it to the old way of building compiler-rt as well to limit the number of places where I check for the flags -- it should not cause any additional rebuilds there.

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However, if it is required for tests, I think that the tests should add that dependency, not compiler-rt.

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@edymtt edymtt Mar 20, 2025 •
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I would like to do that, but build-script does not schedule Swift as an external project of LLVM (like build.ps1 does) -- so I cannot put LLVMTestingSupport as a dependency of the test targets that need that.


llvm_cmake_options.define('LLVM_ENABLE_PROJECTS',
';'.join(llvm_enable_projects))

# In the near future we are aiming to build compiler-rt with
# LLVM_ENABLE_RUNTIMES
# Until that happens, we need to unset this variable from
# LLVM CMakeCache.txt for two reasons
# * prevent PRs testing this variable to affect other runs landing
# unrelated features
# * avoid fallouts should we land such change and then have to revert
# it to account for unforeseen regressions
llvm_cmake_options.undefine('LLVM_ENABLE_RUNTIMES')
llvm_cmake_options.define('LLVM_ENABLE_RUNTIMES',
';'.join(llvm_enable_runtimes))

# NOTE: This is not a dead option! It is relied upon for certain
# bots/build-configs!
Expand Down Expand Up @@ -491,9 +548,21 @@ 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:
# This is a courtesy fallback to avoid breaking downstream presets
# we are not aware of
components.remove('compiler-rt')
components.append('builtins')
components.append('runtimes')
print('warning: replaced legacy LLVM component compiler-rt '
'with builtins;runtimes -- consider updating your preset',
flush=True)

for component in components:
if self.is_cross_compile_target(host_target):
if component == 'compiler-rt':
if self.is_cross_compile_target(host_target) \
or not self.args.build_compiler_rt:
if component in ['compiler-rt', 'builtins', 'runtimes']:
continue
install_targets.append('install-{}'.format(component))

Expand Down
17 changes: 17 additions & 0 deletions validation-test/BuildSystem/llvm-build-compiler-rt-on-linux.test
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@@ -0,0 +1,17 @@
# REQUIRES: standalone_build
# REQUIRES: OS=linux-gnu

# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes --cmake %cmake 2>&1 | %FileCheck --check-prefix=LINUX %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes=1 --cmake %cmake 2>&1 | %FileCheck --check-prefix=LINUX %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --cmake %cmake 2>&1 | %FileCheck --check-prefix=LINUX %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes=0 --cmake %cmake 2>&1 | %FileCheck --check-prefix=LINUX %s

# LINUX: Building llvm
# LINUX-DAG: cmake -G Ninja
# LINUX-SAME: -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR{{[^ ]*}}=OFF
# LINUX-SAME: -DSANITIZER_COMMON_LINK_FLAGS{{[^ ]*}}=-Wl,-z,undefs
# LINUX-SAME: llvm
28 changes: 28 additions & 0 deletions validation-test/BuildSystem/llvm-build-compiler-rt-on-macosx.test
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# REQUIRES: standalone_build
# REQUIRES: OS=macosx

# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes --cmake %cmake 2>&1 | %FileCheck --check-prefix=LLVM-USE-RUNTIMES %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes=1 --cmake %cmake 2>&1 | %FileCheck --check-prefix=LLVM-USE-RUNTIMES %s

# LLVM-USE-RUNTIMES: Building llvm
# LLVM-USE-RUNTIMES-DAG: cmake -G Ninja
# LLVM-USE-RUNTIMES-SAME: -DBUILTINS_{{[^ ]*}}_CMAKE_OSX_SYSROOT
# LLVM-USE-RUNTIMES-SAME: -DRUNTIMES_{{[^ ]*}}_CMAKE_OSX_SYSROOT
# LLVM-USE-RUNTIMES-SAME: -DLLVM_BUILTIN_TARGETS
# LLVM-USE-RUNTIMES-SAME: -DLLVM_RUNTIME_TARGETS
# LLVM-USE-RUNTIMES-SAME: -DRUNTIMES_{{[^ ]*}}_COMPILER_RT_SANITIZERS_TO_BUILD
# LLVM-USE-RUNTIMES-NOT: rtsan
# LLVM-USE-RUNTIMES-SAME: -DBUILTINS_{{[^ ]*}}_COMPILER_RT_FORCE_BUILD_BAREMETAL_MACHO_BUILTINS_ARCHS
# LLVM-USE-RUNTIMES-SAME: llvm

# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --cmake %cmake 2>&1 | %FileCheck --check-prefix=EXTERNAL-COMPILER-RT %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes=0 --cmake %cmake 2>&1 | %FileCheck --check-prefix=EXTERNAL-COMPILER-RT %s

# EXTERNAL-COMPILER-RT: Building llvm
# EXTERNAL-COMPILER-RT-DAG: cmake -G Ninja
# EXTERNAL-COMPILER-RT-SAME: -DCOMPILER_RT_FORCE_BUILD_BAREMETAL_MACHO_BUILTINS_ARCHS
# EXTERNAL-COMPILER-RT-SAME: llvm
25 changes: 25 additions & 0 deletions validation-test/BuildSystem/llvm-build-compiler-rt-with-enable-external-compiler-rt.test
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# REQUIRES: standalone_build

# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --cmake %cmake 2>&1 | %FileCheck --check-prefix=EXTERNAL-COMPILER-RT-CHECK %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes=0 --cmake %cmake 2>&1 | %FileCheck --check-prefix=EXTERNAL-COMPILER-RT-CHECK %s

# EXTERNAL-COMPILER-RT-CHECK: Building llvm
# EXTERNAL-COMPILER-RT-CHECK-DAG: cmake -G Ninja
# EXTERNAL-COMPILER-RT-CHECK-SAME: -DLLVM_TOOL_COMPILER_RT_BUILD:BOOL=TRUE
# EXTERNAL-COMPILER-RT-CHECK-SAME: -DLLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL=TRUE
# EXTERNAL-COMPILER-RT-CHECK-SAME: -DLLVM_ENABLE_PROJECTS{{[^ ]*}}={{[^ ]*}}compiler-rt
# EXTERNAL-COMPILER-RT-CHECK-SAME: llvm

# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --skip-build-compiler-rt --cmake %cmake 2>&1 | %FileCheck --check-prefix=DONT-BUILD-COMPILER-RT %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes=0 --skip-build-compiler-rt --cmake %cmake 2>&1 | %FileCheck --check-prefix=DONT-BUILD-COMPILER-RT %s

# DONT-BUILD-COMPILER-RT: Building llvm
# DONT-BUILD-COMPILER-RT-DAG: cmake -G Ninja
# DONT-BUILD-COMPILER-RT-SAME: -DLLVM_TOOL_COMPILER_RT_BUILD:BOOL=FALSE
# DONT-BUILD-COMPILER-RT-SAME: -DLLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL=FALSE
# DONT-BUILD-COMPILER-RT-NOT: compiler-rt
# DONT-BUILD-COMPILER-RT-SAME: llvm
26 changes: 26 additions & 0 deletions validation-test/BuildSystem/llvm-build-compiler-rt-with-use-runtimes.test
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# REQUIRES: standalone_build

# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes --cmake %cmake 2>&1 | %FileCheck --check-prefix=LLVM-USE-RUNTIMES %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes=1 --cmake %cmake 2>&1 | %FileCheck --check-prefix=LLVM-USE-RUNTIMES %s

# LLVM-USE-RUNTIMES: Building llvm
# LLVM-USE-RUNTIMES-DAG: cmake -G Ninja
# LLVM-USE-RUNTIMES-SAME: -ULLVM_TOOL_COMPILER_RT_BUILD
# LLVM-USE-RUNTIMES-SAME: -ULLVM_BUILD_EXTERNAL_COMPILER_RT
# LLVM-USE-RUNTIMES-SAME: -DLLVM_ENABLE_RUNTIMES{{[^ ]*}}={{[^ ]*}}compiler-rt
# LLVM-USE-RUNTIMES-SAME: runtimes
# LLVM-USE-RUNTIMES-SAME: llvm

# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes --skip-build-compiler-rt --cmake %cmake 2>&1 | %FileCheck --check-prefix=DONT-BUILD-COMPILER-RT %s
# RUN: %empty-directory(%t)
# RUN: SKIP_XCODE_VERSION_CHECK=1 SWIFT_BUILD_ROOT=%t %swift_src_root/utils/build-script --dry-run --skip-build --llvm-build-compiler-rt-with-use-runtimes=1 --skip-build-compiler-rt --cmake %cmake 2>&1 | %FileCheck --check-prefix=DONT-BUILD-COMPILER-RT %s

# DONT-BUILD-COMPILER-RT: Building llvm
# DONT-BUILD-COMPILER-RT-DAG: cmake -G Ninja
# DONT-BUILD-COMPILER-RT-NOT: LLVM_TOOL_COMPILER_RT_BUILD
# DONT-BUILD-COMPILER-RT-NOT: LLVM_BUILD_EXTERNAL_COMPILER_RT
# DONT-BUILD-COMPILER-RT-NOT: compiler-rt
# DONT-BUILD-COMPILER-RT-SAME: llvm