[sr #110403] autoconf-2.70 AC_TYPE_INTMAX_T test failure under OmniOS

[Zack Weinberg]

Follow-up Comment #5, sr #110403 (project autoconf):

I just ran the autoconf testsuite myself on this system, using the tip of
branch-2.70.  I do *not* see AC_TYPE_INTMAX_T fail, but I *do* see two other
failures which appear to have the same root cause: config.status files with a
missing line break at the end of a here-document in the parent configure
script.


SHELL=${CONFIG_SHELL-/bin/sh}
export SHELL## -------------------- ##
## M4sh Initialization. ##


and


test -n "$AWK" || AWK=awk# The default lists apply if the user does not
specify any file.


In Bourne shell syntax, `#` only begins a comment if it is the *beginning* of
a shell word, so both of these turn into syntax errors.

To my surprise, this is *not* an intermittent fault.  It happens every single
time I run the configure script for one of the tests that fails for me. 
However, it doesn't happen if I run `bash ./configure` instead of
`./configure`, and it goes away if I add a single blank line near the top of
the offending configure script.  

I think what we're looking at here is a bug in OmniOS /bin/sh, in which
here-documents lose their final \n character if they are at particular offsets
within a shell script.  I'll see if I can come up with a precise test for that
hypothesis.

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