bbbbc093fe
This patch introduces support for Integrated Distributed ThinLTO (DTLTO) in COFF LLD. DTLTO enables the distribution of ThinLTO backend compilations via external distribution systems, such as Incredibuild, during the traditional link step: https://llvm.org/docs/DTLTO.html. Note: Bitcode members of non-thin archives are not currently supported. This will be addressed in a future change. This patch is sufficient to allow for self-hosting an LLVM build with DTLTO if thin archives are used. Testing: - LLD `lit` test coverage has been added, using a mock distributor to avoid requiring Clang. - Cross-project `lit` tests cover integration with Clang. For the design discussion of the DTLTO feature, see: https://github.com/llvm/llvm-project/pull/126654
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
// REQUIRES: lld-link
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/// Simple test that DTLTO works with a single input bitcode file and that
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/// --save-temps can be applied to the remote compilation.
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// RUN: rm -rf %t && mkdir %t && cd %t
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// RUN: %clang --target=x86_64-pc-windows-msvc -c -flto=thin %s -o dtlto.obj
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// RUN: lld-link /subsystem:console /entry:_start dtlto.obj \
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// RUN: -thinlto-distributor:%python \
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// RUN: -thinlto-distributor-arg:%llvm_src_root/utils/dtlto/local.py \
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// RUN: -thinlto-remote-compiler:%clang \
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// RUN: -thinlto-remote-compiler-arg:--save-temps
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/// Check that the required output files have been created.
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// RUN: ls | sort | FileCheck %s
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/// No files are expected before.
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// CHECK-NOT: {{.}}
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/// Linked ELF.
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// CHECK: {{^}}dtlto.exe{{$}}
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/// Produced by the bitcode compilation.
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// CHECK-NEXT: {{^}}dtlto.obj{{$}}
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/// --save-temps output for the backend compilation.
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// CHECK-NEXT: {{^}}dtlto.s{{$}}
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// CHECK-NEXT: {{^}}dtlto.s.0.preopt.bc{{$}}
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// CHECK-NEXT: {{^}}dtlto.s.1.promote.bc{{$}}
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// CHECK-NEXT: {{^}}dtlto.s.2.internalize.bc{{$}}
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// CHECK-NEXT: {{^}}dtlto.s.3.import.bc{{$}}
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// CHECK-NEXT: {{^}}dtlto.s.4.opt.bc{{$}}
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// CHECK-NEXT: {{^}}dtlto.s.5.precodegen.bc{{$}}
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// CHECK-NEXT: {{^}}dtlto.s.resolution.txt{{$}}
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/// No files are expected after.
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// CHECK-NOT: {{.}}
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int _start() { return 0; }
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