test.sh

#!/usr/bin/env bash

# Where the script is located
BASE=$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")
TC_BLD=${BASE}/tc-build
LINUX_SRC=${BASE}/linux

# Build the compiler.
# Explanation of flags:
#   * '--assertions': The bug only happens with assertions.
#   * '--build-stage1-only': Speeds up the build since the script is
#     the script is two stage by default.
#   * '--no-update': We do not want the script trying to checkout a
#     revision different from the one we are currently testing.
#   * '--projects clang': by default, the script builds clang, compiler-rt,
#     lld, and polly. We know this bug lies only in clang.
#   * '--targets "RISCV;X86"': We only need the RISC-V (target) and X86 (host)
#     backends. Avoid building the others to speed up the build (slightly).
# If the compiler cannot be built, exit 125 because it is untestable.

"${TC_BLD}"/build-llvm.py \
    --assertions \
    --build-stage1-only \
    --no-update \
    --projects clang \
    --targets "RISCV;X86" || exit 125

# Build the Linux kernel (specifically 'crypto/jitterentropy.o' because that
# is the translation unit with the error)
# Removing the out folder is to avoid potential issues with distclean
# PATH is needed so that the toolchain we built above is used, as well as
# having access to riscv64 binutils
# Being the last line of the script means that its exit code will be the
# exit code of the script
rm -rf "${LINUX_SRC}"/out && \
PATH=${TC_BLD}/build/llvm/stage1/bin:${TC_BLD}/install/bin:${PATH} \
    make -C "${LINUX_SRC}" \
         -j"$(nproc)" \
         -s \
         ARCH=riscv \
         CC=clang \
         CROSS_COMPILE=riscv64-linux-gnu- \
         LD=riscv64-linux-gnu-ld \
         LLVM=1 \
         LLVM_IAS=1 \
         O=out/riscv64 \
         allyesconfig \
         crypto/jitterentropy.o