Merge branch 'tmp-noexec'

  TMP="${TMPDIR%/}"

fi

if [ ! -w "$TMP" ] || [ ! -x "$TMP" ]; then

# Check if TMPDIR is accessible and can hold executables.

tmp_executable="${TMP}/ruby-build-test.$$"

noexec=""

if mkdir -p "$TMP" && touch "$tmp_executable" 2>/dev/null; then

  cat > "$tmp_executable" <<<"#!$BASH"

  chmod +x "$tmp_executable"

else

  echo "ruby-build: TMPDIR=$TMP is set to a non-accessible location" >&2

  exit 1

fi

"$tmp_executable" 2>/dev/null || noexec=1

rm -f "$tmp_executable"

if [ -n "$noexec" ]; then

  echo "ruby-build: TMPDIR=$TMP cannot hold executables (partition possibly mounted with \`noexec\`)" >&2

  exit 1

fi

# Work around warnings building Ruby 2.0 on Clang 2.x:

# pass -Wno-error=shorten-64-to-32 if the compiler accepts it.