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@@ -1,56 +0,0 @@
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# Individual preset options:
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#
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# 1. mixin-preset: building for Linux, without compiler assertions, and with
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# most tests disabled
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# 2. build-ninja=0, libicu=0, skip-build-curl, skip-build-zlib: we'd prefer to
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# pick these up from the system
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# 3. build-swift-libexec=0: don't build binaries normally installed in
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# `/usr/local/libexec` because we're not allowed to install there ourselves
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# 4. extra-cmake-options:
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# * -DSWIFT_USE_LINKER=lld: let Swift know we'll be building it with `lld`
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# * -DBUILD_TESTING, -DSWIFT_INCLUDE_TESTS, -DSWIFT_INCLUDE_TEST_BINARIES:
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# the `no_test` preset disables building most, but not all tests; we don't
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# need to build any of them
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# * -DCOMPILER_RT_BUILD_ORC: the `compiler-rt` library defaults to building
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# the ORC LLVM JIT library, which we don't require; we disable it because
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# it builds with executable stacks, which trip up warnings on installation
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# * -DPython3_FIND_UNVERSIONED_NAMES: LLDB ships with Python bindings, and
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# uses CMake to search for Python. By default, CMake tries to find the
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# latest version installed on disk (currently, `python3.13`, then
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# `python3.12`, then...). This might not be the version of Python specified
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# by `PYTHON_SINGLE_TARGET`, which we want to respect. We use
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# `python_setup` to place `${EPYTHON}` at the front of `PATH` as the
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# unversioned `python3`, so we want CMake to discover and use this binary
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# first before falling back to its search
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# 5. llvm-targets-to-build: we don't currently support architectures other than
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# amd64, so there's no point in building LLVM for multiple architectures; if
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# this changes (or we start supporting cross-compilation), we'll need to
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# build for more than just the host
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--- a/swift/utils/build-presets.ini
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+++ b/swift/utils/build-presets.ini
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@@ -3051,3 +3051,24 @@ skip-test-cmark
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llvm-cmake-options=
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-DCLANG_DEFAULT_LINKER=gold
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+
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+[preset: gentoo]
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+mixin-preset=buildbot_linux,no_assertions,no_test
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+build-ninja=0
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+extra-cmake-options=
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+ -DLLVM_USE_LINKER:STRING=lld
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+ -DBUILD_TESTING:BOOL=NO
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+ -DSWIFT_INCLUDE_TESTS:BOOL=NO
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+ -DSWIFT_INCLUDE_TEST_BINARIES:BOOL=NO
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+ -DCOMPILER_RT_BUILD_ORC:BOOL=NO
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+ -DPython3_FIND_UNVERSIONED_NAMES:STRING=FIRST
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+llvm-targets-to-build=host
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+skip-build-curl
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+skip-build-zlib
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+
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+[preset: gentoo,libcxx]
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+mixin-preset=gentoo
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+libcxx
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+llvm-cmake-options=
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+ -DCLANG_DEFAULT_LINKER=lld
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+ -DCLANG_DEFAULT_CXX_STDLIB=libc++
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Itai Ferber