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| 1 | +# Minimal Docker image with clang-format and clang-tidy built from LLVM source |
| 2 | +# Uses static linking for smallest possible image size |
| 3 | +# Based on Alpine Linux 3.21 |
| 4 | + |
| 5 | +FROM alpine:3.21 AS builder |
| 6 | + |
| 7 | +RUN apk add --no-cache \ |
| 8 | + build-base \ |
| 9 | + cmake \ |
| 10 | + ninja \ |
| 11 | + python3 \ |
| 12 | + git \ |
| 13 | + linux-headers \ |
| 14 | + wget \ |
| 15 | + clang \ |
| 16 | + clang-dev |
| 17 | + |
| 18 | +# Download and extract LLVM source |
| 19 | +ARG LLVM_VERSION=17.0.6 |
| 20 | +WORKDIR /src |
| 21 | +RUN wget -q https://github.com/llvm/llvm-project/releases/download/llvmorg-${LLVM_VERSION}/llvm-project-${LLVM_VERSION}.src.tar.xz && \ |
| 22 | + tar -xf llvm-project-${LLVM_VERSION}.src.tar.xz && \ |
| 23 | + mv llvm-project-${LLVM_VERSION}.src llvm-project && \ |
| 24 | + rm llvm-project-${LLVM_VERSION}.src.tar.xz |
| 25 | + |
| 26 | +# Configure LLVM build with minimal size optimizations |
| 27 | +WORKDIR /src/llvm-project/build |
| 28 | +RUN cmake -G Ninja ../llvm \ |
| 29 | + -DCMAKE_BUILD_TYPE=MinSizeRel \ |
| 30 | + -DCMAKE_INSTALL_PREFIX=/usr/local \ |
| 31 | + -DCMAKE_C_COMPILER=clang \ |
| 32 | + -DCMAKE_CXX_COMPILER=clang++ \ |
| 33 | + -DCMAKE_CXX_STANDARD=17 \ |
| 34 | + -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" \ |
| 35 | + -DLLVM_TARGETS_TO_BUILD="" \ |
| 36 | + -DLLVM_INCLUDE_TESTS=OFF \ |
| 37 | + -DLLVM_INCLUDE_EXAMPLES=OFF \ |
| 38 | + -DLLVM_INCLUDE_BENCHMARKS=OFF \ |
| 39 | + -DLLVM_INCLUDE_DOCS=OFF \ |
| 40 | + -DLLVM_ENABLE_BINDINGS=OFF \ |
| 41 | + -DLLVM_ENABLE_OCAMLDOC=OFF \ |
| 42 | + -DLLVM_ENABLE_Z3_SOLVER=OFF \ |
| 43 | + -DLLVM_ENABLE_LIBXML2=OFF \ |
| 44 | + -DLLVM_ENABLE_ZLIB=OFF \ |
| 45 | + -DLLVM_ENABLE_ZSTD=OFF \ |
| 46 | + -DLLVM_ENABLE_TERMINFO=OFF \ |
| 47 | + -DLLVM_BUILD_STATIC=ON \ |
| 48 | + -DLLVM_LINK_LLVM_DYLIB=OFF \ |
| 49 | + -DLLVM_BUILD_LLVM_DYLIB=OFF \ |
| 50 | + -DBUILD_SHARED_LIBS=OFF \ |
| 51 | + -DLLVM_STATIC_LINK_CXX_STDLIB=ON \ |
| 52 | + -DCMAKE_EXE_LINKER_FLAGS="-static" \ |
| 53 | + -DCLANG_ENABLE_STATIC_ANALYZER=OFF \ |
| 54 | + -DCLANG_ENABLE_ARCMT=OFF \ |
| 55 | + -DCLANG_BUILD_EXAMPLES=OFF |
| 56 | + |
| 57 | +# Build only the required tools |
| 58 | +RUN ninja clang-format clang-tidy clang-apply-replacements |
| 59 | + |
| 60 | +# Install binaries |
| 61 | +RUN ninja install-clang-format install-clang-tidy install-clang-apply-replacements install-clang-resource-headers |
| 62 | + |
| 63 | +# Copy run-clang-tidy helper script |
| 64 | +RUN cp /src/llvm-project/clang-tools-extra/clang-tidy/tool/run-clang-tidy.py /usr/local/bin/run-clang-tidy && \ |
| 65 | + chmod +x /usr/local/bin/run-clang-tidy |
| 66 | + |
| 67 | +# Strip binaries to reduce size |
| 68 | +RUN strip /usr/local/bin/clang-format \ |
| 69 | + /usr/local/bin/clang-tidy \ |
| 70 | + /usr/local/bin/clang-apply-replacements |
| 71 | + |
| 72 | +# Final minimal runtime image |
| 73 | +FROM alpine:3.21 |
| 74 | + |
| 75 | +# Install only Python runtime for run-clang-tidy script |
| 76 | +RUN apk add --no-cache python3 |
| 77 | + |
| 78 | +# Copy static binaries from builder |
| 79 | +COPY --from=builder /usr/local/bin/clang-format /usr/local/bin/ |
| 80 | +COPY --from=builder /usr/local/bin/clang-tidy /usr/local/bin/ |
| 81 | +COPY --from=builder /usr/local/bin/clang-apply-replacements /usr/local/bin/ |
| 82 | +COPY --from=builder /usr/local/bin/run-clang-tidy /usr/local/bin/ |
| 83 | + |
| 84 | +# Copy clang resource headers so clang-tidy uses its own headers |
| 85 | +COPY --from=builder /usr/local/lib/clang/ /usr/local/lib/clang/ |
| 86 | + |
| 87 | +# Verify installations |
| 88 | +RUN clang-format --version && \ |
| 89 | + clang-tidy --version && \ |
| 90 | + run-clang-tidy --help > /dev/null |
| 91 | + |
| 92 | +WORKDIR /workspace |
| 93 | + |
| 94 | +CMD ["/bin/sh"] |
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