cosmopolitan/build/link
Justine Tunney f213556366 Add binfmt_misc workaround detector to builds
This is a recently introduced Linux Kernel feature that gives people
like Debian package mantainers the power to arbitrarily redefine how
executables are interpreted by the kernel. If your system gets tuned
this way and you're not able to disable it, then you need to restore
default behavior for the APE MZqFpD prefix as follows:

    sudo sh -c "echo ':APE:M::MZqFpD::/bin/sh:' >/proc/sys/fs/binfmt_misc/register"

This prefix will cover all .com executables built with this tooling.
Please don't run the above command unless you're certain you need it.
See #2 for additional context.
2020-08-31 20:09:23 -07:00

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#!/bin/sh
#-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
#───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
#
# OVERVIEW
#
# GNU Linker Veneer
#
# DESCRIPTION
#
# This script wraps normal linker commands that're transparently
# passed-through. It adds ephemeral logging and directory creation.
#
# EXAMPLE
#
# build/linker ld -o program program.o
if [ ! -d o/third_party/gcc ]; then
third_party/gcc/unbundle.sh
fi
export LC_ALL=C # very important for ld
MKDIR=${MKDIR:-$(command -v mkdir) -p} || exit
OUT=
FIRST=1
OUTARG=0
for x; do
if [ $FIRST -eq 1 ]; then
set --
FIRST=0
elif [ $OUTARG -eq 1 ]; then
OUTARG=0
OUT="$x"
fi
case "$x" in
-o)
OUTARG=1
;;
esac
set -- "$@" "$x"
done
if [ "$SILENT" = "0" ]; then
printf "%s\n" "$*" >&2
else
printf "$LOGFMT" "${ACTION:-LINK.elf}" "$OUT" >&2
fi
OUTDIR="${OUT%/*}"
if [ "$OUTDIR" != "$OUT" ] && [ ! -d "$OUTDIR" ]; then
$MKDIR "$OUTDIR" || exit 2
fi
REASON=failed
trap REASON=interrupted INT
"$@" && exit
if [ "$TERM" = "dumb" ]; then
f='%s %s\r\n\r\n'
else
f='\033[91m%s\033[39m \033[94m%s\033[39m\r\n\r\n'
fi
printf "$f" "link $REASON:" "$*" >&2
exit 1