From 09bab92d4ac3d9d586d9b0cca0635743f483e12c Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Wed, 4 Sep 2019 15:51:27 -0500
Subject: Convenience script to build gcc+musl cross compiler toolchains for
 various targets using https://github.com/richfelker/musl-cross-make

---
 scripts/mcm-buildall.sh | 151 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100755 scripts/mcm-buildall.sh

(limited to 'scripts')

diff --git a/scripts/mcm-buildall.sh b/scripts/mcm-buildall.sh
new file mode 100755
index 00000000..7197f8d3
--- /dev/null
+++ b/scripts/mcm-buildall.sh
@@ -0,0 +1,151 @@
+#!/bin/bash
+
+# Script to build all supported cross and native compilers using
+# https://github.com/richfelker/musl-cross-make
+# (Check that out and run this script in that directory.)
+
+# This isn't directly used by toybox, but is useful for testing.
+
+# All toolchains after the first are themselves cross compiled (so they
+# can be statically linked against musl on the host, for binary portability.)
+# static i686 binaries are basically "poor man's x32".
+BOOTSTRAP=i686-linux-musl
+
+[ -z "$OUTPUT" ] && OUTPUT="$PWD/ccc"
+
+if [ "$1" == clean ]
+then
+  rm -rf "$OUTPUT" host-* *.log
+  make clean
+  exit
+fi
+
+make_toolchain()
+{
+  # Set cross compiler path
+  LP="$PATH"
+  if [ -z "$TYPE" ]
+  then
+    OUTPUT="$PWD/host-$TARGET"
+    EXTRASUB=y
+  else
+    if [ "$TYPE" == static ]
+    then
+      HOST=$BOOTSTRAP
+      [ "$TARGET" = "$HOST" ] && LP="$PWD/host-$HOST/bin:$LP"
+      TYPE=cross
+      EXTRASUB=y
+      LP="$OUTPUT/$HOST-cross/bin:$LP"
+    else
+      HOST="$TARGET"
+      export NATIVE=y
+      LP="$OUTPUT/${RENAME:-$TARGET}-cross/bin:$LP"
+    fi
+    COMMON_CONFIG="CC=\"$HOST-gcc -static --static\" CXX=\"$HOST-g++ -static --static\""
+    export -n HOST
+    OUTPUT="$OUTPUT/${RENAME:-$TARGET}-$TYPE"
+  fi
+
+  if [ -e "$OUTPUT.sqf" ] || [ -e "$OUTPUT/bin/$TARGET-ld" ] ||
+     [ -e "$OUTPUT/bin/ld" ]
+  then
+    return
+  fi
+
+  # Change title bar to say what we're currently building
+
+  echo === building $TARGET-$TYPE
+  echo -en "\033]2;$TARGET-$TYPE\007"
+
+  rm -rf build/"$TARGET" "$OUTPUT" &&
+  if [ -z "$CPUS" ]
+  then
+    CPUS="$(nproc)"
+    [ "$CPUS" != 1 ] && CPUS=$(($CPUS+1))
+  fi
+  set -x &&
+  PATH="$LP" make OUTPUT="$OUTPUT" TARGET="$TARGET" \
+    GCC_CONFIG="--disable-nls --disable-libquadmath --disable-decimal-float --disable-multilib --enable-languages=c,c++ $GCC_CONFIG" \
+    COMMON_CONFIG="CFLAGS=\"$CFLAGS -g0 -Os\" CXXFLAGS=\"$CXXFLAGS -g0 -Os\" LDFLAGS=\"$LDFLAGS -s\" $COMMON_CONFIG" \
+    install -j$CPUS || exit 1
+  set +x
+  echo -e '#ifndef __MUSL__\n#define __MUSL__ 1\n#endif' \
+    >> "$OUTPUT/${EXTRASUB:+$TARGET/}include/features.h"
+
+  if [ ! -z "$RENAME" ] && [ "$TYPE" == cross ]
+  then
+    CONTEXT="output/$RENAME-cross/bin"
+    for i in "$CONTEXT/$TARGET-"*
+    do
+      X="$(echo $i | sed "s@.*/$TARGET-\([^-]*\)@\1@")"
+      ln -sf "$TARGET-$X" "$CONTEXT/$RENAME-$X"
+    done
+  fi
+
+  # Prevent cross compiler reusing dynamically linked host build files for
+  # $BOOTSTRAP arch
+  [ -z "$TYPE" ] && make clean
+
+  if [ "$TYPE" == native ]
+  then
+    # gcc looks in "../usr/include" but not "/bin/../include" (relative to the
+    # executable). That means /usr/bin/gcc looks in /usr/usr/include, so that's
+    # not a fix either. So add a NOP symlink as a workaround for The Crazy.
+    ln -s . "$OUTPUT/usr" || exit 1
+    [ ! -z "$(which mksquashfs 2>/dev/null)" ] &&
+      mksquashfs "$OUTPUT" "$OUTPUT.sqf" -all-root &&
+      [ -z "$CLEANUP" ] && rm -rf "$OUTPUT"
+  fi
+}
+
+# Expand compressed target into binutils/gcc "tuple" and call make_toolchain
+make_tuple()
+{
+  PART1=${1/:*/}
+  PART3=${1/*:/}
+  PART2=${1:$((${#PART1}+1)):$((${#1}-${#PART3}-${#PART1}-2))}
+
+  # Do we need to rename this toolchain after building it?
+  RENAME=${PART1/*@/}
+  [ "$RENAME" == "$PART1" ] && RENAME=
+  PART1=${PART1/@*/}
+  TARGET=${PART1}-linux-musl${PART2} 
+
+  [ -z "$NOCLEAN" ] && rm -rf build
+
+  for TYPE in static native
+  do
+    TYPE=$TYPE TARGET=$TARGET GCC_CONFIG="$PART3" RENAME="$RENAME" \
+      make_toolchain 2>&1 | tee "$OUTPUT"/log/${RENAME:-$PART1}-${TYPE}.log
+  done
+}
+
+mkdir -p "$OUTPUT"/log
+
+# Make bootstrap compiler (no $TYPE, dynamically linked against host libc)
+# We build the rest of the cross compilers with this so they're linked against
+# musl-libc, because glibc doesn't fully support static linking and dynamic
+# binaries aren't really portable between distributions
+TARGET=$BOOTSTRAP make_toolchain 2>&1 | tee -a "$OUTPUT/log/$BOOTSTRAP"-host.log
+
+if [ $# -gt 0 ]
+then
+  for i in "$@"
+  do
+    make_tuple "$i"
+  done
+else
+  # First target builds a proper version of the $BOOTSTRAP compiler above,
+  # used to build the rest (which are in alphabetical order)
+  for i in i686:: \
+         aarch64:eabi: armv4l:eabihf:"--with-arch=armv5t --with-float=soft" \
+         armv5l:eabihf:--with-arch=armv5t armv7l:eabihf:--with-arch=armv7-a \
+         "armv7m:eabi:--with-arch=armv7-m --with-mode=thumb --disable-libatomic --enable-default-pie" \
+         armv7r:eabihf:"--with-arch=armv7-r --enable-default-pie" \
+         i486:: m68k:: microblaze:: mips:: mips64:: mipsel:: powerpc:: \
+         powerpc64:: powerpc64le:: s390x:: sh2eb:fdpic:--with-cpu=mj2 \
+         sh4::--enable-incomplete-targets x86_64:: x86_64@x32:x32:
+  do
+    make_tuple "$i"
+  done
+fi
-- 
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