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system76-coreboot/util/xcompile/xcompile
Arthur Heymans 97ed403650 util/xcompile: Use a more complete clang target 
When the compiler is used as a linker frontend clang tries to match the
target string with what it supports internally. If it's not sufficiently
complete it will forward linking to GCC which is not desirable. This is
necessary when doing LTO with clang.

Change-Id: Ie9356a2bc0f5b77e934cc16482d6ccb1961195dc
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80730
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2024-03-30 10:13:53 +00:00

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#!/usr/bin/env bash
#
# SPDX-License-Identifier: GPL-2.0-only
# Usage: [--debug] [path to xgcc/bin directory]
# Enable debug output
if [ "$1" = "--debug" ]; then
shift
set -x
fi
# GENERIC_COMPILER_PREFIX defaults to empty but can be used to override
# compiler search behavior
TMPFILE=""
XGCCPATH=$1
# payloads under payloads/external crossgcc path
if [ -d "$(pwd)/../../../../util/crossgcc/xgcc/bin/" ]
then
XGCCPATH=${XGCCPATH:-"$(pwd)/../../../../util/crossgcc/xgcc/bin/"}
fi
# libpayload crossgcc path
if [ -d "$(pwd)/../../util/crossgcc/xgcc/bin/" ]
then
XGCCPATH=${XGCCPATH:-"$(pwd)/../../util/crossgcc/xgcc/bin/"}
fi
# coreboot crossgcc path
if [ -d "$(pwd)/util/crossgcc/xgcc/bin/" ]
then
XGCCPATH=${XGCCPATH:-"$(pwd)/util/crossgcc/xgcc/bin/"}
fi
die() {
echo "ERROR: $*" >&2
exit 1
}
clean_up() {
if [ -n "$TMPFILE" ]; then
rm -f "$TMPFILE" "$TMPFILE.c" "$TMPFILE.o"
fi
}
trap clean_up EXIT
program_exists() {
type "$1" >/dev/null 2>&1
}
if [ "$("${XGCCPATH}/iasl" 2>/dev/null | grep -c ACPI)" -gt 0 ]; then
IASL=${XGCCPATH}/iasl
elif [ "$(iasl 2>/dev/null | grep -c ACPI)" -gt 0 ]; then
IASL=iasl
fi
if program_exists "${XGCCPATH}/nasm" ; then
NASM="${XGCCPATH}/nasm"
elif program_exists nasm; then
NASM=nasm
fi
if program_exists "${XGCCPATH}/gcc"; then
HOSTCC="${XGCCPATH}/gcc"
elif program_exists gcc; then
HOSTCC=gcc
elif program_exists cc; then
HOSTCC=cc
else
die "no host compiler found"
fi
# Look for a C++ compiler (for kconfig's qconf), but don't fail if there is
# none, just set the compiler to false(1) which will break early enough if
# used while being less confusing than errors about "g not found" when
# "$HOSTCXX -g" evaluates to "-g" and make drops the leading dash.
if program_exists "${XGCCPATH}/g++"; then
HOSTCXX="${XGCCPATH}/g++"
elif program_exists g++; then
HOSTCXX=g++
elif program_exists c++; then
HOSTCXX=c++
else
HOSTCXX=false
fi
# try to find the core count using various methods
CORES="$(getconf _NPROCESSORS_ONLN 2>/dev/null)"
if [ -z "$CORES" ]; then
NPROC=$(command -v nproc)
if [ -n "$NPROC" ]; then
CORES="$($NPROC)"
fi
fi
if [ -z "$CORES" ]; then
SYSCTL=$(command -v sysctl)
if [ -n "$SYSCTL" ]; then
CORES="$(${SYSCTL} -n hw.ncpu 2>/dev/null)"
fi
fi
if [ -z "$CORES" ] && [ -f /proc/cpuinfo ]; then
CORES="$(grep 'processor' /proc/cpuinfo 2>/dev/null | wc -l)"
fi
cat <<EOF
# platform agnostic and host tools
XGCCPATH:=${XGCCPATH}
NASM:=${NASM}
IASL:=${IASL}
HOSTCC?=${HOSTCC}
HOSTCXX?=${HOSTCXX}
CPUS?=${CORES}
EOF
testcc() {
local cc="$1"
local cflags="$2"
local tmp_c="$TMPFILE.c"
local tmp_o="$TMPFILE.o"
rm -f "$tmp_c" "$tmp_o"
echo "void _start(void) {}" >"$tmp_c"
"$cc" -nostdlib -Werror $cflags -c "$tmp_c" -o "$tmp_o" >/dev/null 2>&1
}
testld() {
local gcc="$1"
local cflags="$2"
local ld="$3"
local ldflags="$4"
local tmp_o="$TMPFILE.o"
local tmp_elf="$TMPFILE.elf"
rm -f "$tmp_elf"
testcc "$gcc" "$cflags" &&
$ld -nostdlib -static $ldflags -o "$tmp_elf" "$tmp_o" >/dev/null 2>&1
}
testas() {
local gccprefix="$1"
local twidth="$2"
local arch="$3"
local use_dash_twidth="$4"
local endian="$5"
local obj_file="$TMPFILE.o"
local full_arch="elf$twidth-$arch"
rm -f "$obj_file"
[ -n "$use_dash_twidth" ] && use_dash_twidth="--$twidth"
[ -n "$endian" ] && endian="-$endian"
"${gccprefix}as" $use_dash_twidth $endian -o "$obj_file" "$TMPFILE" \
2>/dev/null || return 1
# Check output content type.
local obj_type="$(LANG=C LC_ALL='' "${gccprefix}"objdump -p "$obj_file" 2>/dev/null)"
local obj_arch="$(expr "$obj_type" : '.*format \(.[a-z0-9-]*\)')"
[ "$obj_arch" = "$full_arch" ] || return 1
unset ASFLAGS LDFLAGS
unset FLAGS_GCC CFLAGS_GCC CFLAGS_CLANG
if [ -n "$use_dash_twidth" ]; then
ASFLAGS="--$twidth"
FLAGS_GCC="-m$twidth"
CFLAGS_CLANG="-m$twidth"
LDFLAGS="-b $full_arch"
fi
# Special parameters only available in dash_twidth mode.
[ -n "$use_dash_twidth" ] && case "$full_arch" in
"elf32-i386" )
LDFLAGS="$LDFLAGS -melf_i386"
FLAGS_GCC="$FLAGS_GCC -Wl,-b,elf32-i386 -Wl,-melf_i386"
CFLAGS_CLANG="$CFLAGS_CLANG -Wl,-b,elf32-i386 -Wl,-melf_i386"
;;
esac
return 0
}
detect_special_flags() {
local architecture="$1"
# Check for an operational -m32/-m64
testcc "$GCC" "$FLAGS_GCC -m$TWIDTH " &&
FLAGS_GCC="$FLAGS_GCC -m$TWIDTH "
# Use bfd linker instead of gold if available:
testcc "$GCC" "$FLAGS_GCC -fuse-ld=bfd" &&
FLAGS_GCC="$FLAGS_GCC -fuse-ld=bfd" && LINKER_SUFFIX='.bfd'
testcc "$GCC" "$FLAGS_GCC -fno-stack-protector" &&
FLAGS_GCC="$FLAGS_GCC -fno-stack-protector"
testcc "$GCC" "$FLAGS_GCC -Wl,--build-id=none" &&
FLAGS_GCC="$FLAGS_GCC -Wl,--build-id=none"
testcc "$GCC" "$CFLAGS_GCC -Wno-address-of-packed-member $FLAGS_GCC" &&
CFLAGS_GCC="$CFLAGS_GCC -Wno-address-of-packed-member"
testcc "$GCC" "$CFLAGS_GCC --param=min-pagesize=1024 $FLAGS_GCC" &&
CFLAGS_GCC="$CFLAGS_GCC --param=min-pagesize=1024"
case "$architecture" in
x86)
;;
x64)
;;
arm64)
testld "$GCC" "$FLAGS_GCC" "${GCCPREFIX}ld${LINKER_SUFFIX}" \
"$LDFLAGS --fix-cortex-a53-843419" && \
LDFLAGS_ARM64_A53_ERRATUM_843419+=" --fix-cortex-a53-843419"
;;
riscv)
testcc "$GCC" "$FLAGS_GCC -march=rv64iadc_zicsr_zifencei" &&
ARCH_SUFFIX="_zicsr_zifencei"
;;
esac
}
detect_compiler_runtime() {
test -z "$GCC" || \
CC_RT_GCC="$(${GCC} ${CFLAGS_GCC} ${FLAGS_GCC} -print-libgcc-file-name)"
if [ ${CLANG_RUNTIME} = "libgcc" ]; then
CC_RT_CLANG=${CC_RT_GCC}
else
test -z "$CLANG" || \
CC_RT_CLANG="$(${CLANG} ${CFLAGS_CLANG} -print-libgcc-file-name 2>/dev/null)"
fi
}
report_arch_toolchain() {
cat <<EOF
# elf${TWIDTH}-${TBFDARCH} toolchain (${GCC})
ARCH_SUPPORTED+=${TARCH}
SUBARCH_SUPPORTED+=${TSUPP-${TARCH}}
ARCH_SUFFIX_${TARCH}:=${ARCH_SUFFIX}
# GCC
GCC_CC_${TARCH}:=${GCC}
GCC_CFLAGS_${TARCH}:=${CFLAGS_GCC} ${FLAGS_GCC}
# Generally available for GCC's cc1:
GCC_CFLAGS_${TARCH}+=-fno-delete-null-pointer-checks -Wlogical-op
GCC_ADAFLAGS_${TARCH}:=${FLAGS_GCC}
GCC_COMPILER_RT_${TARCH}:=${CC_RT_GCC}
GCC_COMPILER_RT_FLAGS_${TARCH}:=${CC_RT_EXTRA_GCC}
EOF
if [ "${TARCH}" = "x86_64" ]; then
cat <<EOF
GCC_CFLAGS_${TARCH} += -malign-data=abi
EOF
fi
cat <<EOF
# Clang
CLANG_CC_${TARCH}:=${CLANG}
CLANG_CFLAGS_${TARCH}:=${CFLAGS_CLANG}
CLANG_CFLAGS_${TARCH}+=-Qunused-arguments -m${TWIDTH}
# tone down clang compiler warnings
CLANG_CFLAGS_${TARCH}+=-Wno-unused-variable -Wno-unused-function -Wno-tautological-compare
CLANG_CFLAGS_${TARCH}+=-Wno-shift-overflow -Wno-address-of-packed-member -Wno-initializer-overrides
CLANG_CFLAGS_${TARCH}+=-fbracket-depth=2048 -mllvm -asm-macro-max-nesting-depth=1000
CLANG_COMPILER_RT_${TARCH}:=${CC_RT_CLANG}
CLANG_COMPILER_RT_FLAGS_${TARCH}:=${CC_RT_EXTRA_CLANG}
# Leak the target arch into the preprocessor flags with clang.
# This is needed to preprocess linker scripts
CLANG_CPPFLAGS_${TARCH}:=${CPPFLAGS_CLANG}
# GCC/Clang Common
ifeq (\$(CONFIG_COMPILER_GCC)\$(CONFIG_LP_COMPILER_GCC),y)
CC_${TARCH}:=\$(GCC_CC_${TARCH})
CFLAGS_${TARCH}:=\$(GCC_CFLAGS_${TARCH})
COMPILER_RT_${TARCH}:=\$(GCC_COMPILER_RT_${TARCH})
COMPILER_RT_FLAGS_${TARCH}:=\$(GCC_COMPILER_RT_FLAGS_${TARCH})
else
CC_${TARCH}:=\$(CLANG_CC_${TARCH})
CFLAGS_${TARCH}:=\$(CLANG_CFLAGS_${TARCH})
CPPFLAGS_${TARCH}:=\$(CLANG_CPPFLAGS_${TARCH})
COMPILER_RT_${TARCH}:=\$(CLANG_COMPILER_RT_${TARCH})
COMPILER_RT_FLAGS_${TARCH}:=\$(CLANG_COMPILER_RT_FLAGS_${TARCH})
endif
EOF
# Generally the x86 should build for i686 -- no sse/mmx
# instructions since SMM modules are compiled using these
# flags. Note that this doesn't prevent a project using
# xcompile to explicitly specify -mmsse, etc flags.
# The Quark processor doesn't support the instructions
# introduced with the Pentium 6 architecture, so allow it
# to use i586 instead.
if [ "${TARCH}" = "x86_64" ]; then
cat <<EOF
CFLAGS_${TARCH} += -march=nocona
EOF
fi
if [ "${TARCH}" = "x86_32" ]; then
cat <<EOF
CFLAGS_${TARCH} += -march=i686
EOF
fi
cat <<EOF
CPP_${TARCH}:=${GCCPREFIX}cpp
AS_${TARCH}:=${GCCPREFIX}as ${ASFLAGS}
LD_${TARCH}:=${GCCPREFIX}ld${LINKER_SUFFIX} ${LDFLAGS}
GCOV_${TARCH}:=${GCCPREFIX}gcov
EOF
if [ "${TARCH}" = "arm64" ] && \
[ -n "${LDFLAGS_ARM64_A53_ERRATUM_843419}" ]; then
cat <<EOF
ifeq (\$(CONFIG_ARM64_A53_ERRATUM_843419),y)
LD_${TARCH}+=${LDFLAGS_ARM64_A53_ERRATUM_843419}
endif
EOF
fi # if [ "${TARCH}" = "arm64" ]...
cat <<EOF
ifeq (\$(CONFIG_COMPILER_GCC)\$(CONFIG_LP_COMPILER_GCC),y)
NM_${TARCH}:=${GCCPREFIX}gcc-nm
AR_${TARCH}:=${GCCPREFIX}gcc-ar
else
NM_${TARCH}:=${GCCPREFIX}nm
AR_${TARCH}:=${GCCPREFIX}ar
endif
OBJCOPY_${TARCH}:=${GCCPREFIX}objcopy
OBJDUMP_${TARCH}:=${GCCPREFIX}objdump
READELF_${TARCH}:=${GCCPREFIX}readelf
STRIP_${TARCH}:=${GCCPREFIX}strip
GNATBIND_${TARCH}:=${GCCPREFIX}gnatbind
CROSS_COMPILE_${TARCH}:=${GCCPREFIX}
EOF
#The two blank lines above are intentional separators
}
# Architecture definitions
SUPPORTED_ARCHITECTURES="arm arm64 riscv x64 x86 ppc64"
# TARCH: local name for the architecture
# (used as CC_${TARCH} in the build system)
# TBFDARCHS: architecture name in binutils (eg elf32-${TBFDARCH})
# TCLIST: first part of the compiler triplet (eg i386 in i386-elf)
# TWIDTH: numerical argument for cpu mode: gcc -m${TWIDTH}
# TSUPP: supported subarchs (for -mcpu=...)
# TABI: typically elf, eabi or linux
arch_config_arm() {
TARCH="arm"
TBFDARCHS="littlearm"
TCLIST="armv7-a armv7a arm"
TWIDTH="32"
TSUPP="arm armv4 armv7 armv7_m armv7_r"
TABI="eabi"
}
arch_config_arm64() {
TARCH="arm64"
TBFDARCHS="littleaarch64"
TCLIST="aarch64"
TWIDTH="64"
TSUPP="arm64 armv8_64"
TABI="elf"
}
arch_config_riscv() {
TARCH="riscv"
TBFDARCHS="littleriscv"
TCLIST="riscv64 riscv"
TWIDTH="64"
TABI="elf"
}
arch_config_x64() {
TARCH="x86_64"
TBFDARCHS="x86-64"
TCLIST="x86_64"
TWIDTH="64"
TABI="elf"
}
arch_config_x86() {
TARCH="x86_32"
TBFDARCHS="i386"
TCLIST="i386 x86_64"
TWIDTH="32"
TABI="elf"
CC_RT_EXTRA_GCC="--wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3"
}
arch_config_ppc64() {
TARCH="ppc64"
TBFDARCHS="powerpc"
TCLIST="powerpc64"
TWIDTH="64"
TSUPP="ppc64"
TABI="linux-gnu" # there is no generic ABI on ppc64
CC_RT_EXTRA_GCC="-mcpu=power8 -mbig-endian"
}
# Right now, the clang reference toolchain is not building compiler-rt builtins
# for any of the cross compile architectures. Hence we use libgcc for now,
# because that is available and lets us proceed with getting coreboot clang
# ready. Toggle CLANG_RUNTIME if you want to experiment with compiler-rt.
CLANG_RUNTIME="libgcc"
# CLANG_RUNTIME="compiler-rt"
test_architecture() {
local architecture=$1
local endian gccprefix search
GCCPREFIX="invalid"
unset TABI TARCH TBFDARCH TCLIST TENDIAN TSUPP TWIDTH
unset CC_RT_EXTRA_GCC CC_RT_EXTRA_CLANG
unset GCC CLANG
unset ARCH_SUFFIX
if type "arch_config_$architecture" > /dev/null; then
"arch_config_$architecture"
else
die "no architecture definition for $architecture"
fi
# To override toolchain, define CROSS_COMPILE_$arch or CROSS_COMPILE as
# environment variable.
# Ex: CROSS_COMPILE_arm="armv7a-cros-linux-gnueabi-"
# CROSS_COMPILE_x86="i686-pc-linux-gnu-"
search="$(eval echo "\$CROSS_COMPILE_$architecture" 2>/dev/null)"
search="$search $CROSS_COMPILE"
for toolchain in $TCLIST; do
search="$search $XGCCPATH$toolchain-$TABI-"
search="$search $toolchain-$TABI-"
search="$search $toolchain-linux-gnu-"
search="$search $toolchain-linux-"
search="$search $toolchain-"
search="$search $toolchain-linux-gnueabi-"
done
echo "###########################################################################"
echo "# $architecture"
echo "# TARCH_SEARCH=$search"
# Search toolchain by checking assembler capability.
for TBFDARCH in $TBFDARCHS; do
for gccprefix in $search "$GENERIC_COMPILER_PREFIX"; do
program_exists "${gccprefix}as" || continue
for endian in $TENDIAN ""; do
{ testas "$gccprefix" "$TWIDTH" "$TBFDARCH" \
"" "$endian" ||
testas "$gccprefix" "$TWIDTH" "$TBFDARCH" \
"TRUE" "$endian" ; } && \
testcc "${gccprefix}gcc" "$CFLAGS_GCC" "$FLAGS_GCC" && \
GCCPREFIX="$gccprefix" && \
break 3
done
done
done
if [ "invalid" != "$GCCPREFIX" ]; then
GCC="${GCCPREFIX}gcc"
fi
for clang_arch in $TCLIST invalid; do
for clang_prefix in $search $XGCCPATH "$GENERIC_COMPILER_PREFIX"; do
testcc "${clang_prefix}clang" "-target ${clang_arch}-none-unknown-${TABI} -c" && break 2
done
done
if [ "invalid" != "$clang_arch" ]; then
# FIXME: this may break in a clang && !gcc configuration,
# but that's more of a clang limitation. Let's be optimistic
# that this will change in the future.
CLANG="${clang_prefix}clang"
CLANG_TARGET="-target ${clang_arch}-none-unknown-${TABI}"
CFLAGS_CLANG="$CLANG_TARGET $CFLAGS_CLANG"
CPPFLAGS_CLANG="$CLANG_TARGET $CPPFLAGS_CLANG"
fi
}
OUT="$(mktemp /tmp/temp.XXXXXX 2>/dev/null || echo /tmp/temp.coreboot.$RANDOM)"
rm -f $OUT
for architecture in $SUPPORTED_ARCHITECTURES; do
(
TMPFILE="$(mktemp /tmp/temp.XXXXXX 2>/dev/null || echo /tmp/temp.coreboot.$RANDOM)"
touch $TMPFILE
test_architecture "$architecture"
detect_special_flags "$architecture"
detect_compiler_runtime "$architecture"
report_arch_toolchain
clean_up
) > $OUT.$architecture &
done
wait
for architecture in $SUPPORTED_ARCHITECTURES; do
cat $OUT.$architecture
rm -f $OUT.$architecture
done
echo XCOMPILE_COMPLETE:=1
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