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autoconf fails if env var U set

From: Tim Wallace
Subject: autoconf fails if env var U set
Date: Wed, 13 Apr 2011 13:31:02 -0400
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110223 Thunderbird/3.1.8

This is a bug discovered when trying to build postgresql 9.0.3 on Redhat Enterprise Linux 5. If env var U is set, it fails, as pointed out by the Postgres maintainer. I guess it's autoconf 2.59, and I'm guessing you're past that now, so possibly it has already been fixed. Baffling bug, though.


-------- Original Message --------
Subject: Re: [BUGS] Make fails if env var U set
Date: Wed, 13 Apr 2011 13:20:51 -0400
From: Tom Lane <address@hidden>
To: Wallace, Timothy - 0993 - MITLL <address@hidden>
CC: address@hidden <address@hidden>

Tim Wallace <address@hidden> writes:
Version: 9.0.3
after successful configure, make fails if you have the env var "U" set.
  It fails almost immediately in the src/port directory with a
nonsensical error message involving the contents of the "U" var.  Unset
U and everything built fine.

So far as I can find, there is no reference to a symbol "U" in any of our
makefiles.  However, there is this bit in the configure script:

for ac_i in : $LIBOBJS; do test "x$ac_i" = x: && continue
  # 1. Remove the extension, and $U if already installed.
  ac_i=`$as_echo "$ac_i" | sed "$ac_script"`
  # 2. Prepend LIBOBJDIR.  When used with automake>=1.10 LIBOBJDIR
  #    will be set to the directory where LIBOBJS objects are built.
  ac_libobjs="$ac_libobjs \${LIBOBJDIR}$ac_i\$U.$ac_objext"
  ac_ltlibobjs="$ac_ltlibobjs \${LIBOBJDIR}$ac_i"'$U.lo'

I have no idea what that's trying to do, but maybe it gets confused
if U has an existing definition.  Suggest you file a bug against

                        regards, tom lane

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