let it be so
Motiejus Jakštys
commit
64a3ef606e
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@ -0,0 +1,2 @@
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build --incompatible_enable_cc_toolchain_resolution
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build --action_env BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
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@ -0,0 +1,45 @@
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set -eu
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BIN_DIR="$(git rev-parse --show-toplevel)/bin"
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export PATH="$BIN_DIR:$PATH"
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_u_bzl=https://github.com/bazelbuild/bazelisk/releases/download/v1.12.0/bazelisk-
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_u_bldf=https://github.com/bazelbuild/buildtools/releases/download/5.1.0/buildifier-
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if [[ "${PRINT_TOOL_HASHES:-no}" = "yes" ]]; then
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for os in linux darwin; do
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for arch in amd64 arm64; do
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hash_bzl=$(direnv fetchurl "${_u_bzl}$os-$arch")
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hash_bldf=$(direnv fetchurl "${_u_bldf}$os-$arch")
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echo -e "bzl: $os-$arch\t$hash_bzl"
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echo -e "bldf: $os-$arch\t$hash_bldf"
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done
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done
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fi
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# to fetch the hashes, run:
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# $ PRINT_TOOL_HASHES=yes bash .envrc
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case "$(uname | tr A-Z a-z)-$(uname -m)" in
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linux-x86_64)
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bzl=$(direnv fetchurl "${_u_bzl}linux-amd64" sha256-awvLLqFbyhb/+r5v2nWANEA3U1TAhUgP42HSy/MlAds=)
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bldf=$(direnv fetchurl "${_u_bldf}linux-amd64" sha256-Ur9rECy0+IRk4ZfKrAbWl5P6KwX1rVCn579vvWVmSKM=)
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;;
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linux-aarch64)
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bzl=$(direnv fetchurl "${_u_bzl}linux-arm64" sha256-KdhhykjfJKPo3sV/sAUIumZKMZIQR7JobDjPmiDUY58=)
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bldf=$(direnv fetchurl "${_u_bldf}linux-arm64" sha256-kX1ZnbsEDmOuen4a23ENIFeBGQL9yeNczpJev9lm7rg=)
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;;
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darwin-x86_64)
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bzl=$(direnv fetchurl "${_u_bzl}darwin-amd64" sha256-cM9/50gI0WQY03H+uMzU58RCFdsD0sT/x1t2e3ZUCfs=)
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bldf=$(direnv fetchurl "${_u_bldf}darwin-amd64" sha256-yTeNn0KT/DjsVKCPvHTnqdKJFNrmiRM0QB5Z849uZdw=)
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;;
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darwin-arm64)
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bzl=$(direnv fetchurl "${_u_bzl}darwin-arm64" sha256-NFu4uQDWue90I06enkE67Tj7Ke8lXkrhisYb9KYQLYQ=)
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bldf=$(direnv fetchurl "${_u_bldf}darwin-arm64" sha256-dF/rXqlstv85p2soIcV1kf1wtSgyVWJIbUe10IkA4uQ=)
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;;
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*)
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>&2 echo "unsupported architecture tuple $(uname | tr A-Z a-z)-$(uname -m)"
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exit 1;;
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esac
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ln -sf "${bzl}" "$BIN_DIR/bazel"
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ln -sf "${bldf}" "$BIN_DIR/buildifier"
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@ -0,0 +1,12 @@
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*~
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*.sw[op]
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/bin/bazel
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/bin/buildifier
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/bin/bazelisk-*
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/bazel-test-zigcc
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/bazel-bin
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/bazel-out
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/bazel-testlogs
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/bazel-x
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@ -0,0 +1,9 @@
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NTESTS=96
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[
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cc_binary(
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name = "zigzag-{}".format(i),
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srcs = ["main.c"],
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copts = ["-DZIGZAG={}".format(i)],
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) for i in range(NTESTS)
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]
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bazel-zig-cc and llvm
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---------------------
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bazel-zig-cc has a performance issue when compiling many files. This repository
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reproduces that.
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Steps to reproduce
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------------------
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llvm14: 10-11 seconds to compile 96 binaries on an 8-core machine:
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```
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$ bazel clean; bazel shutdown; bazel build --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux ...
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INFO: Starting clean (this may take a while). Consider using --async if the clean takes more than several minutes.
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Starting local Bazel server and connecting to it...
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INFO: Analyzed 96 targets (41 packages loaded, 1458 targets configured).
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INFO: Found 96 targets...
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INFO: Elapsed time: 10.725s, Critical Path: 0.66s
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INFO: 481 processes: 289 internal, 192 linux-sandbox.
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INFO: Build completed successfully, 481 total actions
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```
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zig cc: 3.5 minutes. Anecdotally when looking at `htop` looks like it does not
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parallelize at all:
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```
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$ bazel clean; bazel shutdown; bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Starting clean (this may take a while). Consider using --async if the clean takes more than several minutes.
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Starting local Bazel server and connecting to it...
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INFO: Analyzed 96 targets (41 packages loaded, 14394 targets configured).
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INFO: Found 96 targets...
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INFO: Elapsed time: 214.333s, Critical Path: 18.31s
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INFO: 385 processes: 193 internal, 192 linux-sandbox.
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INFO: Build completed successfully, 385 total actions
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```
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load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
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## LLVM-14
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BAZEL_TOOLCHAIN_TAG = "0.7.2"
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BAZEL_TOOLCHAIN_SHA = "f7aa8e59c9d3cafde6edb372d9bd25fb4ee7293ab20b916d867cd0baaa642529"
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http_archive(
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name = "com_grail_bazel_toolchain",
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sha256 = BAZEL_TOOLCHAIN_SHA,
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strip_prefix = "bazel-toolchain-{tag}".format(tag = BAZEL_TOOLCHAIN_TAG),
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canonical_id = BAZEL_TOOLCHAIN_TAG,
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url = "https://github.com/grailbio/bazel-toolchain/archive/{tag}.tar.gz".format(tag = BAZEL_TOOLCHAIN_TAG),
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)
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load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")
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bazel_toolchain_dependencies()
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load("@com_grail_bazel_toolchain//toolchain:rules.bzl", "llvm_toolchain")
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llvm_toolchain(
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name = "llvm_toolchain",
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llvm_version = "14.0.0",
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)
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load("@llvm_toolchain//:toolchains.bzl", "llvm_register_toolchains")
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#llvm_register_toolchains()
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### ZIG
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BAZEL_ZIG_CC_VERSION = "ae2746ebebc4e8d5c9d9638f0d1f858708002681"
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http_archive(
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name = "bazel-zig-cc",
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sha256 = "0f50bb8e130429ccae3017ba3274dd276ac744474b426f72df86a4a4a8c66ca0",
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strip_prefix = "bazel-zig-cc-{}".format(BAZEL_ZIG_CC_VERSION),
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urls = [
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"https://git.sr.ht/~motiejus/bazel-zig-cc/archive/{}.tar.gz".format(BAZEL_ZIG_CC_VERSION),
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],
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)
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load("@bazel-zig-cc//toolchain:defs.bzl", zig_toolchains = "toolchains")
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zig_toolchains()
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register_toolchains(
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# amd64 toolchains for libc-aware platforms:
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"@zig_sdk//libc_aware/toolchain:linux_amd64_gnu.2.19",
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"@zig_sdk//libc_aware/toolchain:linux_amd64_gnu.2.28",
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"@zig_sdk//libc_aware/toolchain:linux_amd64_gnu.2.31",
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"@zig_sdk//libc_aware/toolchain:linux_amd64_musl",
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# arm64 toolchains for libc-aware platforms:
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"@zig_sdk//libc_aware/toolchain:linux_arm64_gnu.2.28",
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"@zig_sdk//libc_aware/toolchain:linux_arm64_musl",
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)
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Loading…
Reference in New Issue