#!/bin/sh
# LLVM/Clang toolchain cross-compilation script for QNX 8.0 by Pierre-Marie Baty <pm@pmbaty.com>
# NOTE TO SELF: DO NOT USE $0 AS THIS SCRIPT CAN BE RUN *OR* SOURCED! (see build-llvm.sh in the VM)
export QNXSDK_VERSION="8.0.0" # version of the QNX SDK in use, in <major>.<minor>.<revision> format
export QNXSDK_PATH="../qnx800" # relative location from the path of this script where to find the QNX platform SDK
export QNXSDK_HOSTPATH="host/linux/x86_64" # relative location in QNXSDK_PATH of the tree containing the build tools that are runnable on the build host
export QNXSDK_TARGETPATH="target/qnx" # relative location in QNXSDK_PATH of the tree containing the QNX8 system header files
export BUILD_DIR_NAME="llvm-build" # name of the directory on the build host's desktop where the LLVM sources will be built
export BUILD_TARGET_ARCH="x86_64" # CPU architecture to build LLVM for, either "x86_64" or "aarch64"
export LLVM_VERSION="18.1.4" # version of LLVM that will be built
export LLVM_SOURCES_FILE="llvmorg-${LLVM_VERSION}.tar.gz" # name of the file containing LLVM version LLVM_VERSION sources
export LLVM_SOURCES_URL="https://github.com/llvm/llvm-project/archive/refs/tags/${LLVM_SOURCES_FILE}" # download URL of LLVM_SOURCES_FILE
export LLVM_SOURCES_DIR="llvm-project-llvmorg-${LLVM_VERSION}" # name of directory created when extracting LLVM_SOURCES_FILE
# see where we are
export CURRENT_DIR="$(pwd)"
# verify we're a x86_64 Linux host
if [ ! "$(uname)" = "Linux" ] || [ ! "$(uname -m)" = "x86_64" ]; then
echo ""
echo "Error: this script requires a x86_64 Linux machine (possibly a virtual machine) as the build host." | fold -s -w 79
echo ""
exit 1
fi
# verify that we have the QNX platform SDK
if [ ! -d "${QNXSDK_PATH}/${QNXSDK_HOSTPATH}" ] || [ ! -d "${QNXSDK_PATH}/${QNXSDK_TARGETPATH}" ]; then
echo ""
echo "Error: the ${QNXSDK_PATH} path doesn't contain a QNX SDK. It must contain the 'host' and 'target' directories of the QNX SDP for the targeted version of QNX and the ${BUILD_TARGET_ARCH} platform. Please deploy these directories and try again." | fold -s -w 79
echo ""
exit 1
fi
# verify that we have wget, python3, cmake, gcc, g++ and ninja
if ! wget --version > /dev/null 2>&1 \
|| ! python3 --version > /dev/null 2>&1 \
|| ! cmake --version > /dev/null 2>&1 \
|| ! gcc --version > /dev/null 2>&1 \
|| ! g++ --version > /dev/null 2>&1 \
|| ! ninja --version > /dev/null 2>&1; then
echo ""
echo "Error: this script requires at the very least the following tools installed:"
echo " wget"
echo " python3"
echo " cmake"
echo " gcc"
echo " g++"
echo " ninja"
echo "Please install them (possibly as binary packages with apt-get) and try again."
echo ""
exit 1
fi
# verify that the symlinks are deployed in the SDK -- just test one of them
if [ ! -e "${QNXSDK_PATH}/${QNXSDK_TARGETPATH}/usr/include/readline.h" ]; then
echo ""
echo "Error: the toolchain platform-specific symbolic links have not been deployed in this QNX SDK. Please run" | fold -s -w 79
echo "(on a POSIX machine:)"
echo " cd ${QNXSDK_PATH}" | fold -s -w 79
echo " find . -name symlinks.lst -exec ./symlinks.sh {} create \\; && printf 'present' > .symlinks-state" | fold -s -w 79
echo "(else on a Windows machine:)"
echo " cd ${QNXSDK_PATH}" | fold -s -w 79
echo " host\\win64\\x86_64\\usr\\bin\\busybox.exe sh -c \"" \
"find . -name symlinks.lst -exec ./symlinks.sh {} create \\; && printf 'present' > .symlinks-state" \
"\"" | fold -s -w 79
echo "Note that this step WILL take time on a Win32 machine, but is only done once." | fold -s -w 79
echo ""
exit 1
fi
# construct the target triple (actually a quadruple)
export TARGET_ARCH="${BUILD_TARGET_ARCH}"
test "${BUILD_TARGET_ARCH}" = "x86_64" && export TARGET_VENDOR="pc" || export TARGET_VENDOR="unknown"
export TARGET_KERNEL="nto"
export TARGET_SYSTEM="qnx${QNXSDK_VERSION}"
export TARGET_TRIPLE="${TARGET_ARCH}-${TARGET_VENDOR}-${TARGET_KERNEL}-${TARGET_SYSTEM}"
echo "Will build LLVM for ${TARGET_TRIPLE}"
# change to an immediately visible path, i.e. the user's desktop (failsafe to $HOME if xdg-user-dir is unavailable)
STAGING_PATH="$(xdg-user-dir DESKTOP 2>/dev/null || echo "${HOME}")"
cd "${STAGING_PATH}"
# create a symlink in /tmp that will lead to the QNX platform SDK so as to avoid spaces in paths if it doesn't exist already
# (this is totally prohibitive with the official QNX toolchain)
if [ ! -L /tmp/qnxsdk ] || [ ! "$(readlink /tmp/qnxsdk)" = "$(realpath "${CURRENT_DIR}/${QNXSDK_PATH}")" ]; then
echo "Creating symlink to QNX toolchain in /tmp/qnxsdk..."
rm -rf /tmp/qnxsdk 2>/dev/null
ln -fs "$(realpath "${CURRENT_DIR}/${QNXSDK_PATH}")" /tmp/qnxsdk || exit 1
fi
# setup the environment
export QNX_HOST="/tmp/qnxsdk/${QNXSDK_HOSTPATH}"
export QNX_TARGET="/tmp/qnxsdk/${QNXSDK_TARGETPATH}"
export MAKEFLAGS="-I${QNX_TARGET}/usr/include"
export PATH="${QNX_HOST}/usr/bin:${PATH}"
# download the LLVM source package and unpack it if not done yet
if [ ! -d "${LLVM_SOURCES_DIR}" ]; then
if [ ! -f "${CURRENT_DIR}/${LLVM_SOURCES_FILE}" ]; then
echo "Downloading LLVM ${LLVM_VERSION} sources from LLVM GitHub..."
wget "${LLVM_SOURCES_URL}" || exit 1
fi
echo "Extracting LLVM ${LLVM_VERSION} sources..."
cd "$(dirname "${LLVM_SOURCES_DIR}")"
tar xzf "${CURRENT_DIR}/${LLVM_SOURCES_FILE}" || exit 1
if [ ! -d "${LLVM_SOURCES_DIR}" ]; then
echo "Error: couldn't find ${LLVM_SOURCES_DIR} in extracted LLVM sources."
exit 1
fi
fi
# create the build directory
echo "Wiping out build directory..."
test -e "${BUILD_DIR_NAME}" && rm -rf "${BUILD_DIR_NAME}"
mkdir "${BUILD_DIR_NAME}" || exit 1
cd "${BUILD_DIR_NAME}" || exit 1
# print the build environment
echo "QNX_HOST=${QNX_HOST}"
echo "QNX_TARGET=${QNX_TARGET}"
echo "MAKEFLAGS=${MAKEFLAGS}"
# create the QNX CMake toolchain file
test -e "${TARGET_TRIPLE}.cmake" || echo '# '${TARGET_TRIPLE}' CMake toolchain file by Pierre-Marie Baty <pm@pmbaty.com>
SET(CMAKE_SYSTEM_NAME "QNX")
SET(CMAKE_SYSTEM_VERSION "'${QNXSDK_VERSION}'")
SET(QNX "1")
SET(QNXNTO "1")
SET(QNX_HOST "$ENV{QNX_HOST}")
SET(QNX_TARGET "$ENV{QNX_TARGET}")
SET(QNX_PROCESSOR "'${TARGET_ARCH}'")
SET(CMAKE_ASM_COMPILER "${QNX_HOST}/usr/bin/'${TARGET_TRIPLE}'-gcc")
SET(CMAKE_ASM_COMPILER_TARGET "gcc_nto${QNX_PROCESSOR}")
SET(CMAKE_C_COMPILER "${QNX_HOST}/usr/bin/'${TARGET_TRIPLE}'-gcc")
SET(CMAKE_C_COMPILER_TARGET "gcc_nto${QNX_PROCESSOR}")
SET(CMAKE_C_FLAGS_DEBUG "-g")
SET(CMAKE_C_FLAGS_MINSIZEREL "-Os -DNDEBUG")
SET(CMAKE_C_FLAGS_RELEASE "-O3 -DNDEBUG")
SET(CMAKE_C_FLAGS_RELWITHDEBINFO "-O2 -g")
SET(CMAKE_C_FLAGS "-D_QNX_SOURCE=1 -I${QNX_TARGET}/usr/include/devs/include_'${TARGET_ARCH}' -I${QNX_TARGET}/usr/include/devs -DDONT_DEFINE_BSD -DDONT_DEFINE___FreeBSD_kernel__ -DDONT_DEFINE_FSCALE -DDONT_DEFINE_MACHINE")
SET(CMAKE_CXX_COMPILER "${QNX_HOST}/usr/bin/'${TARGET_TRIPLE}'-g++")
SET(CMAKE_CXX_COMPILER_TARGET "gcc_nto${QNX_PROCESSOR}")
SET(CMAKE_CXX_FLAGS_DEBUG "-g")
SET(CMAKE_CXX_FLAGS_MINSIZEREL "-Os -DNDEBUG")
SET(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG")
SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g")
SET(CMAKE_CXX_FLAGS "-D_QNX_SOURCE=1 -I${QNX_TARGET}/usr/include/devs/include_'${TARGET_ARCH}' -I${QNX_TARGET}/usr/include/devs -DDONT_DEFINE_BSD -DDONT_DEFINE___FreeBSD_kernel__ -DDONT_DEFINE_FSCALE -DDONT_DEFINE_MACHINE")
SET(CMAKE_LINKER "${QNX_HOST}/usr/bin/'${TARGET_TRIPLE}'-ld.bfd")
SET(CMAKE_SHARED_LINKER_FLAGS "-lsocket")
SET(CMAKE_EXE_LINKER_FLAGS "-lsocket")
SET(CMAKE_RANLIB "${QNX_HOST}/usr/bin/'${TARGET_TRIPLE}'-ranlib")
SET(CMAKE_NM "${QNX_HOST}/usr/bin/'${TARGET_TRIPLE}'-nm")
SET(CMAKE_AR "${QNX_HOST}/usr/bin/'${TARGET_TRIPLE}'-ar")
SET(CMAKE_FIND_ROOT_PATH "${QNX_TARGET}")
SET(CMAKE_FIND_ROOT_PATH_HOST_PROGRAM NEVER)
SET(CMAKE_FIND_ROOT_PATH_HOST_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_HOST_INCLUDE ONLY)
' > "${TARGET_TRIPLE}.cmake"
backup_and_patch_if_necessary()
{
# handy function that patches a file in LLVM_SOURCES_DIR with a given sed replacement regex if necessary, creating backups
# args: <file pathname> <grep_string_to_test_for_presence_of_patch> <sed regex>
# test if already patched
grep -q "${2}" "../${LLVM_SOURCES_DIR}/${1}" && return
# tell what we're about to do
echo "Patching ${1}..."
# have a backup first
test -f "${CURRENT_DIR}/$(echo "${1}"|tr '/' '.') [ORIGINAL]" || cp "../${LLVM_SOURCES_DIR}/${1}" "${CURRENT_DIR}/$(echo "${1}"|tr '/' '.') [ORIGINAL]"
# perform the patch
sed -E "${3}" "${CURRENT_DIR}/$(echo "${1}"|tr '/' '.') [ORIGINAL]" > "${CURRENT_DIR}/$(echo "${1}"|tr '/' '.') [PATCHED]"
# verify that we did it successfully
if ! grep -q "${2}" "${CURRENT_DIR}/$(echo "${1}"|tr '/' '.') [PATCHED]"; then
echo "Error: the file ${1} could not be patched. Please investigate and fix manually." | fold -s -w 79; exit 1
fi
# and put the patched file in place
cp -f "${CURRENT_DIR}/$(echo "${1}"|tr '/' '.') [PATCHED]" "../${LLVM_SOURCES_DIR}/${1}" || exit 1
}
# patch llvm/Support/Unix/Path.inc if not done yet
# replace [defined(__FreeBSD_kernel__)] with [(defined(__FreeBSD_kernel__) || defined(__QNXNTO__))]
# RATIONALE: the concerned parts of the QNX platform SDK (/usr/include/devs/*) are actually largely based on FreeBSD code, to conveniently use the FreeBSD network stack.
# NONETHELESS, QNX *IS NOT* FreeBSD and "__FreeBSD_kernel__" *SHOULD NOT* be defined, else userland code may falsely assume a genuine FreeBSD include tree to be available,
# which leads to compilation errors caused by include files assumed to be there whereas they are in fact nowhere to be found (ex: /usr/include/sys/user.h, among others).
# The QNX8 platform SDK has thus been patched to NOT define __FreeBSD_kernel__ when the -DDONT_DEFINE___FreeBSD_kernel__ flag is passed, and the feature tests in Path.inc
# that branch into FreeBSD APIs (which ones *are* exposed in the QNX libc since QNX largely shares FreeBSD code) are about to be patched right now to accept __QNXNTO__ too.
# Additionally, support for statfs()/fstatfs() has been restored in the QNX8 platform SDK in /usr/include/devs/sys/mount.h where it was claimed but absent from the QNX8 libc.
# FIXME: these hacks should be moved elsewhere not to pollute the QNX8 platform SDK -- it *SHOULD* be possible to build without devs
backup_and_patch_if_necessary "llvm/lib/Support/Unix/Path.inc" __QNXNTO__ 's/defined\(__FreeBSD_kernel__\)/\(defined\(__FreeBSD_kernel__\) \|\| \defined\(__QNXNTO__\)\)/g'
# patch lldb/Source/Host/common/Host.cpp if not done yet
# replace [defined(SIGINFO)] with [(defined(SIGINFO) && !defined(__QNXNTO__))]
# RATIONALE: the QNX people defined SIGINFO to the value of SIGUSR1 for a mysterious reason, defeating the purpose of SIGUSR1
# which should be a User-Definable signal as mandated by POSIX. Consequently, userland code that enumerates POSIX signals
# hits twice the same value and all is left to solve this problem is to filter either one out. Since SIGINFO, contrarily to SIGUSR1,
# is an optional signal, this is the value that will be left out - even if on QNX nobody can actually use SIGUSR1's value.
backup_and_patch_if_necessary "lldb/source/Host/common/Host.cpp" __QNXNTO__ 's/defined\(SIGINFO\)/\(defined\(SIGINFO\) \&\& \!defined\(__QNXNTO__\)\)/g'
# FIXME: another patch is needed for LLDB. Basically, the ptrace() POSIX system call doesn't exist on QNX. Instead
# QNX use their own debug utility: pdebug. Note the /proc filesystem can be used to access a debuggee's virtual memory space.
# in lldb/source/Host/posix/ProcessLauncherPosixFork.cpp line 196:
# if (ptrace(PT_TRACE_ME, 0, nullptr, 0) == -1) // <--- undefined: ptrace, PT_TRACE_ME
# -D LLVM_ENABLE_PROJECTS="clang;lld;lldb" \
# patch compiler-rt/lib/builtins/enable_execute_stack.c if not done yet
# replace [#include "int_lib.h"] with [#ifdef __QNXNTO__\n#define _QNX_SOURCE 1\n#endif\n#include "int_lib.h"]
# RATIONALE: the QNX people decided to hide most of the UNIX APIs of their libc behind a mandatory _QNX_SOURCE definition to separate the Neutrino primitives from the rest maybe.
# This name does not "enforce" any standard at all (like _POSIX_SOURCE and similar names), it's just a convenient hack for the QNX people to hide stuff.
# To put things back on track and expose the POSIX interfaces of their libc to the world, _QNX_SOURCE has been added to the toolchain CMake file, but it happens that
# when building compiler-rt specifically, the CMAKE_C_FLAGS directive is ignored. Patching the source file seems like the best option to fix that.
backup_and_patch_if_necessary "compiler-rt/lib/builtins/enable_execute_stack.c" __QNXNTO__ 's/#include "int_lib.h"/#ifdef __QNXNTO__\n#define _QNX_SOURCE 1\n#endif\n#include "int_lib.h"/g'
# patch libunwind/src/RWMutex.hpp
# replace [#include <pthread.h>] with [#ifdef __QNXNTO__\n#define __EXT_QNX\n#define __EXT_POSIX1_200112\n#endif\n#include <pthread.h>]
# RATIONALE: the pthreads implementation in QNX 'steals' things from the POSIX.1 standard and hides them behind the __EXT_QNX macro,
# which is defined when either _QNX_SOURCE or __EXT without anything else is defined. This is not correct and low-level libraries
# such as libunwind that do not define either of those fail to build. Also note that a FreeBSD-compatible header was added to the QNX8
# platform SDK: /usr/include/link.h, which defines Elf types as Elf64/Elf32 types depending on the architecture and adds some glue.
backup_and_patch_if_necessary "libunwind/src/RWMutex.hpp" __QNXNTO__ 's/#include <pthread.h>/#ifdef __QNXNTO__\n#define __EXT_QNX\n#define __EXT_POSIX1_200112\n#endif\n#include <pthread.h>/g'
# now configure LLVM
echo "Configuring LLVM build..."
cmake \
-D CMAKE_TOOLCHAIN_FILE="${TARGET_TRIPLE}.cmake" \
-D CMAKE_BUILD_TYPE="MinSizeRel" \
-D CMAKE_INSTALL_PREFIX="/tmp/qnxsdk/host/qnx$(echo "${QNXSDK_VERSION}"|awk -F. '{print $1}')/${BUILD_TARGET_ARCH}" \
-D CMAKE_STAGING_PREFIX="/usr/bin" \
-D LLVM_HOST_TRIPLE="${TARGET_TRIPLE}" \
-D LLVM_ENABLE_PROJECTS="clang;lld" \
-D LLVM_ENABLE_RUNTIMES="compiler-rt;libcxx;libcxxabi;libunwind" \
-D LLVM_TARGETS_TO_BUILD="AArch64;X86" \
-D COMPILER_RT_BUILD_SANITIZERS="OFF" \
-G Ninja \
"../${LLVM_SOURCES_DIR}/llvm" || exit 1
# hijack the "bin" and "lib/clang" output directories and redirect them to the hypervisor's filesystem
test -e "${CURRENT_DIR}/llvm-build" && rm -rf "${CURRENT_DIR}/llvm-build"
mkdir -p "${CURRENT_DIR}/llvm-build"
test -d bin && mv bin "${CURRENT_DIR}/llvm-build/bin" || mkdir "${CURRENT_DIR}/llvm-build/bin"
ln -s "${CURRENT_DIR}/llvm-build/bin" bin
mkdir -p "${CURRENT_DIR}/llvm-build/lib"
test -d lib/clang && mv lib/clang "${CURRENT_DIR}/llvm-build/lib/clang" || mkdir "${CURRENT_DIR}/llvm-build/lib/clang"
ln -s "${CURRENT_DIR}/llvm-build/lib/clang" lib/clang
# and do the Lord's work. https://youtu.be/jcyYmCnkbEE
echo "Building LLVM..."
cmake --build . || exit 1
echo "Champagne, James. Champagne."
exit 0