Make cosmocc capable of cross compilation

bin/apecopy

@@ -0,0 +1,95 @@
+#!/bin/sh
+
+PROG=${0##*/}
+COSMO=${COSMO:-/opt/cosmo}
+
+if [ x"$1" = x"--version" ]; then
+cat <<EOF
+$PROG 0.1
+Copyright (c) 2023 Justine Alexandra Roberts Tunney
+Cosmopolitan Libc and LLVM libcxx/compiler-rt are subject to non-GPL
+notice licenses, e.g. ISC, MIT, etc. Your compiled programs must embed
+our copyright notices. This toolchain is configured to do so default.
+Cosmopolitan comes with absolutely NO WARRANTY of any kind.
+For more information, see the Cosmopolitan LICENSE files.
+Copyright (C) 2019 Free Software Foundation, Inc.
+This launches GNU GCC/Binutils subprocesses, which is free software; see
+Cosmopolitan's third_party/gcc/ for source code and copying conditions.
+There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE.
+EOF
+fi
+
+if [ x"$1" = x"--help" ]; then
+cat <<EOF
+Usage: $PROG INPUT OUTPUT
+Converts an executable linked by cosmocc to the Actually Portable
+Executable file format. See $PROG --version for other details.
+EOF
+fi
+
+fatal_error() {
+  echo "$PROG: fatal error: $1" >&2
+  echo "operation terminated." >&2
+  exit 1
+}
+
+CROSS=1
+ARCH=${PROG%%-*}  # split(prog, '-')[0]
+if [ x"$ARCH" = x"$PROG" ]; then
+  ARCH=x86_64
+  CROSS=0
+fi
+
+if [ x"$ARCH" = x"x86_64" ]; then
+  MODE=${MODE:-$m}
+else
+  MODE=${MODE:-${m:-$ARCH}}
+fi
+
+if [ $CROSS -eq 0 ]; then
+  COSMOS=${COSMOS:-/opt/cosmos}
+else
+  COSMOS=${COSMOS:-/opt/cosmos/$ARCH}
+fi
+
+if [ x"$ARCH" = x"x86_64" ]; then
+  OBJCOPYFLAGS="-S -O binary"
+elif [ x"$ARCH" = x"aarch64" ]; then
+  OBJCOPYFLAGS="-S"
+else
+  fatal_error "$ARCH: unsupported architecture"
+fi
+
+if [ ! -d "$COSMO" ]; then
+  fatal_error "you need to clone cosmopolitan to your $COSMO directory"
+fi
+
+if [ ! -f "$COSMO/o//tool/build/zipcopy.com" ] ||
+   [ ! -f "$COSMO/o/third_party/gcc/bin/$ARCH-linux-musl-objcopy" ]; then
+  if [ $CROSS -eq 0 ]; then
+    fatal_error "you need to run: cosmocc --update"
+  else
+    fatal_error "you need to run: $ARCH-unknown-cosmo-cosmocc --update"
+  fi
+fi
+
+INPUT=$1
+OUTPUT=$2
+if [ ! -f "$INPUT" ]; then
+  fatal_error "$INPUT: missing input and output arguments"
+elif [ ! -f "$INPUT" ]; then
+  fatal_error "$INPUT: no such file"
+elif [ ! -f "$INPUT" ]; then
+  fatal_error "$INPUT: missing output argument"
+elif [ x"$INPUT" = x"$OUTPUT" ]; then
+  fatal_error "$INPUT: input and output file can't be the same"
+fi
+
+"$COSMO/o/third_party/gcc/bin/$ARCH-linux-musl-objcopy" \
+  $OBJCOPYFLAGS \
+  "$INPUT" \
+  "$OUTPUT" || exit
+"$COSMO/o//tool/build/zipcopy.com" \
+  "$INPUT" \
+  "$OUTPUT" || exit