portersky
d5728334d6
Add a CMake module that writes rust-project.json on every configure so rust-analyzer can resolve the no-Cargo crate layout, sysroot crates, and proc-macro attributes without Cargo. Co-Authored-By: qwen (lmstudio/qwen3.8-27b@q3_k_xl): LSP setup
37 lines
1.2 KiB
CMake
37 lines
1.2 KiB
CMake
# Generate rust-project.json for rust-analyzer (LSP) support.
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#
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# This project has no Cargo manifest, so rust-analyzer cannot discover the
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# crate layout on its own. The generated file describes the three crates and
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# points at the toolchain sysroot so core/alloc resolve. It is regenerated on
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# every configure; the output is git-ignored.
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if(NOT RUSTC)
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find_program(RUSTC rustc REQUIRED)
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endif()
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execute_process(
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COMMAND "${RUSTC}" --print sysroot
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OUTPUT_VARIABLE RUST_SYSROOT_RAW
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RESULT_VARIABLE RUST_SYSROOT_RESULT
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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if(NOT RUST_SYSROOT_RESULT EQUAL 0 OR NOT RUST_SYSROOT_RAW)
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message(FATAL_ERROR "Failed to query the rustc sysroot")
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endif()
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# Use forward slashes so the JSON needs no backslash escaping.
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string(REPLACE "\\" "/" RUST_SYSROOT "${RUST_SYSROOT_RAW}")
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set(RUST_SYSROOT_SRC "${RUST_SYSROOT}/lib/rustlib/src/rust/library")
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if(NOT IS_DIRECTORY "${RUST_SYSROOT_SRC}")
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message(WARNING "rust-src not found at ${RUST_SYSROOT_SRC}. "
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"Run `rustup component add rust-src` for full LSP support.")
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endif()
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configure_file(
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"${CMAKE_CURRENT_LIST_DIR}/rust-project.json.in"
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"${CMAKE_CURRENT_SOURCE_DIR}/rust-project.json"
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@ONLY
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)
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