Configuring JDK build on Linux, I see the following messages in the output:

<path/to/hs>/closed/autoconf/generated-configure.sh: line 51600: test: -ge: unary operator expected
<path/to/hs>/closed/autoconf/generated-configure.sh: line 51886: test: -ge: unary operator expected

The lines correspond to this line in TOOLCHAIN_CHECK_COMPILER_VERSION:

  if test [$]ARG_PREFIX[COMPARABLE_ACTUAL_VERSION] -ge $COMPARABLE_REFERENCE_VERSION ; then

which looks like this in the generated-configure.sh:

  if test $OPENJDK_BUILD_COMPARABLE_ACTUAL_VERSION -ge $COMPARABLE_REFERENCE_VERSION ; then

This is on Ubuntu 14.04 - bash 4.3.11, in case that matters.