Fix yet another sed bug. The s/// command would copy the \ of substitutions before deciding what to do with them (generally overwriting the \ with the new data). When the substitution was A) at the very end of the new string, B) resolved to nothing, it could leave a trailing \ that didn't belong there and didn't get overwritten because the "copy trailing data" part that copies the original string's null terminator already happened before the \ overwrote it. The ghostwheel() function restarts regexes after embedded NUL bytes, but if the string it's passed is _longer_ than the length it's told then it gets confused (and it means we're off the end of our allocation so segfaults are likely). Fix: test for \ first and move the "copy byte" logic into an else case.

# Toybox configuration file.

# This sets environment variables used by scripts/make.sh

# A synonym.
[ -z "$CROSS_COMPILE" ] && CROSS_COMPILE="$CROSS"
[ -z "$CFLAGS" ] && CFLAGS="-Wall -Wundef -Wno-char-subscripts"
# Required for our expected ABI. we're 8-bit clean thus "char" must be unsigned.
CFLAGS="$CFLAGS -funsigned-char"

[ -z "$OPTIMIZE" ] && OPTIMIZE="-Os -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables"
[ -z "$LDOPTIMIZE" ] && LDOPTIMIZE="-Wl,--gc-sections"
[ -z "$CC" ] && CC=cc
[ -z "$STRIP" ] && STRIP=strip

# If HOSTCC needs CFLAGS, add them to the variable ala HOSTCC="blah-cc --static"
[ -z "$HOSTCC" ] && HOSTCC=gcc