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This change migrates the last patch to an overlay and removes the patch structure. This resolves all IFDs, cleans up the main flake and makes our custom toolchains portable across flakes. The `customClang` and `customStdenv` packages are now available as `lre.clang` and `lre.stdenv`. While the new packages are differently named, they produce the exact same setup as previously. This can be verified by the fact that `generate-toolchains` is a noop between the previous commit and this one. Since a renaming of the `customClang` executable itself would cause differences in the lre-cc toolchain we defer this to a future commit. Fixes TraceMachina#1262 Closes TraceMachina#1512
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| final: _prev: { | ||
| lre = { | ||
| stdenv = final.callPackage ./stdenv.nix { | ||
| llvmPackages = final.llvmPackages_19; | ||
| targetPackages = final; | ||
| }; | ||
|
|
||
| clang = final.callPackage ./clang.nix { | ||
| inherit (final.lre) stdenv; | ||
| }; | ||
| }; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| { | ||
| lib, | ||
| llvmPackages, | ||
| overrideCC, | ||
| stdenv, | ||
| targetPackages, | ||
| useMoldLinker, | ||
| wrapCCWith, | ||
| }: let | ||
| # Adapted from clangUseLLVM. | ||
| # See: https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/compilers/llvm/common/default.nix | ||
| clangVersion = "19"; | ||
| targetLlvmLibraries = targetPackages.llvmPackages_19.libraries; | ||
|
|
||
| mkExtraBuildCommands0 = cc: '' | ||
| rsrc="$out/resource-root" | ||
| mkdir "$rsrc" | ||
| ln -s "${lib.getLib cc}/lib/clang/${clangVersion}/include" "$rsrc" | ||
| echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags | ||
| ''; | ||
| mkExtraBuildCommands = cc: | ||
| mkExtraBuildCommands0 cc | ||
| + '' | ||
| ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib" | ||
| ln -s "${targetLlvmLibraries.compiler-rt.out}/share" "$rsrc/share" | ||
| ''; | ||
|
|
||
| toolchain' = wrapCCWith ( | ||
| rec { | ||
| cc = llvmPackages.clang-unwrapped; | ||
| inherit (targetLlvmLibraries) libcxx; | ||
| inherit (llvmPackages) bintools; | ||
| extraPackages = [ | ||
| targetLlvmLibraries.compiler-rt | ||
| targetLlvmLibraries.libunwind | ||
| ]; | ||
| extraBuildCommands = mkExtraBuildCommands cc; | ||
| } | ||
| // { | ||
| nixSupport.cc-cflags = | ||
| [ | ||
| "-rtlib=compiler-rt" | ||
| "-Wno-unused-command-line-argument" | ||
| "-B${targetLlvmLibraries.compiler-rt}/lib" | ||
| "-stdlib=libc++" | ||
| ] | ||
| ++ lib.optional stdenv.targetPlatform.isLinux "-fuse-ld=mold" | ||
| ++ lib.optional ( | ||
| !stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD | ||
| ) "--unwindlib=libunwind" | ||
| ++ lib.optional ( | ||
| !stdenv.targetPlatform.isWasm | ||
| && !stdenv.targetPlatform.isFreeBSD | ||
| && stdenv.targetPlatform.useLLVM or false | ||
| ) ["-lunwind" "-lc++"] | ||
| ++ lib.optional stdenv.targetPlatform.isWasm "-fno-exceptions"; | ||
| nixSupport.cc-ldflags = | ||
| lib.optionals ( | ||
| !stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD | ||
| ) [ | ||
| "-L${targetLlvmLibraries.libunwind}/lib" | ||
| "-rpath" | ||
| "${targetLlvmLibraries.libunwind}/lib" | ||
| "-L${targetLlvmLibraries.libcxx}/lib" | ||
| "-rpath" | ||
| "${targetLlvmLibraries.libcxx}/lib" | ||
| ]; | ||
| } | ||
| ); | ||
|
|
||
| stdenv' = | ||
| overrideCC | ||
| llvmPackages.libcxxStdenv | ||
| toolchain'; | ||
|
|
||
| toolchain = | ||
| if stdenv.targetPlatform.isDarwin | ||
| then stdenv' # Mold doesn't support darwin. | ||
| else useMoldLinker stdenv'; | ||
| in | ||
| # This toolchain uses Clang as compiler, Mold as linker, libc++ as C++ | ||
| # standard library and compiler-rt as compiler runtime. Resulting rust | ||
| # binaries depend dynamically linked on the nixpkgs distribution of glibc. | ||
| # C++ binaries additionally depend dynamically on libc++, libunwind and | ||
| # libcompiler-rt. Due to a bug we also depend on libgcc_s. | ||
| # | ||
| # TODO(aaronmondal): At the moment this toolchain is only used for the Cargo | ||
| # build. The Bazel build uses a different mostly hermetic LLVM toolchain. We | ||
| # should merge the two by generating the Bazel cc_toolchain from this stdenv. | ||
| # This likely requires a rewrite of | ||
| # https://github.com/bazelbuild/bazel-toolchains as the current implementation | ||
| # has poor compatibility with custom container images and doesn't support | ||
| # generating toolchain configs from image archives. | ||
| # | ||
| # TODO(aaronmondal): Due to various issues in the nixpkgs LLVM toolchains | ||
| # we're not getting a pure Clang/LLVM toolchain here. My guess is that the | ||
| # runtimes were not built with the degenerate LLVM toolchain but with the | ||
| # regular GCC stdenv from nixpkgs. | ||
| # | ||
| # For instance, outputs depend on libgcc_s since libcxx seems to have been was | ||
| # built with a GCC toolchain. We're also not using builtin atomics, or at | ||
| # least we're redundantly linking libatomic. | ||
| # | ||
| # Fix this as it fixes a large number of issues, including better | ||
| # cross-platform compatibility, reduced closure size, and | ||
| # static-linking-friendly licensing. This requires building the llvm project | ||
| # with the correct multistage bootstrapping process. | ||
| toolchain |
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