Here is a bit more on this.
When I configure w/ only a --prefix and CFLAGS=-save-temps, I can examine libevent2013_module.i which contains the following:

# 7 "../../../../../opal/mca/event/libevent2013/libevent2013_module.c" 2
# 1 "../../../../opal/mca/hwloc/hwloc132/hwloc/include/private/autogen/config.h" 1
# 8 "../../../../../opal/mca/event/libevent2013/libevent2013_module.c" 2

What that says is that the '#include "config.h"' on line 7 of libevent2013_module.c has included hwloc's config.h, as I had claimed earlier (and this was much easier than manually traversing the -I list as I had done before).

This is a VPATH build from a trunk tarball (1.7a1r25927).
Perhaps Ralph could not reproduce because of a difference between svn and tarball, such as autotools versions, or use of a non-VPATH build?

For me there is a generated
BLDDIR/opal/mca/event/libevent2013/libevent/config.h
but that directory does NOT appear in the -I's, though the $(srcdir) version does.
So, I suspect a non-VPATH build would work when configured with --without-hwloc

Below is a reformatted version of the compile command from "make V=1".
I've marked two things:
1 = the hwloc directory from whence config.h is being included
2 = two instances of $(srcdir)/libevent (key: 5*"../" = srcdir, 4*"../" = blddir)

gcc     -DHAVE_CONFIG_H
        -I.
        -I../../../../../opal/mca/event/libevent2013
        -I../../../../opal/include
        -I../../../../orte/include
        -I../../../../ompi/include
1->     -I../../../../opal/mca/hwloc/hwloc132/hwloc/include/private/autogen
        -I../../../../opal/mca/hwloc/hwloc132/hwloc/include/hwloc/autogen
2->     -I../../../../../opal/mca/event/libevent2013/libevent
        -I../../../../../opal/mca/event/libevent2013/libevent/include
        -I./libevent/include
        -I../../../../../opal/mca/event/libevent2013/libevent/compat
        -I../../../../..
        -I../../../..
        -I../../../../../opal/include
        -I../../../../../orte/include
        -I../../../../../ompi/include
        -I/home/phargrov/OMPI/openmpi-1.7a1r25927/opal/mca/hwloc/hwloc132/hwloc/include
        -I/home/phargrov/OMPI/openmpi-1.7a1r25927/BLD-with/opal/mca/hwloc/hwloc132/hwloc/include
2->      -I/home/phargrov/OMPI/openmpi-1.7a1r25927/opal/mca/event/libevent2013/libevent
        -I/home/phargrov/OMPI/openmpi-1.7a1r25927/opal/mca/event/libevent2013/libevent/include
        -I/home/phargrov/OMPI/openmpi-1.7a1r25927/BLD-with/opal/mca/event/libevent2013/libevent/include
        -I/usr/include/infiniband
        -I/usr/include/infiniband
        -O3 -DNDEBUG -save-temps -finline-functions -fno-strict-aliasing
        -pthread
        -I/home/phargrov/OMPI/openmpi-1.7a1r25927/opal/mca/hwloc/hwloc132/hwloc/include
        -MT libevent2013_module.lo -MD -MP -MF .deps/libevent2013_module.Tpo
        -c ../../../../../opal/mca/event/libevent2013/libevent2013_module.c
        -fPIC -DPIC -o .libs/libevent2013_module.o

-Paul

On 2/15/2012 1:16 PM, Paul H. Hargrove wrote:

Thanks, Ralph.

I am a little deficient in the autotools department.
So, I will probably only be able to retest after a new trunk tarball is generated tonight.

In the meantime I might be able to get more info on the config.h problem.
If I add -save-temps to CFLAGS I should be able to examine the .i file w/o and w/ --disable-hwloc.
That will either prove or disprove what I've claimed is happening.

-Paul

On 2/15/2012 5:47 AM, Ralph Castain wrote:
Built on Linux --without-hwloc as well, with the fix.

On Wed, Feb 15, 2012 at 3:13 AM, Ralph Castain <rhc@open-mpi.org> wrote:

Hi Paul

The rank_file component should not attempt to build if --without-hwloc is given - I've fixed that now. Thanks for reporting it.

With that fix, I was able to build the trunk on Mac - testing Linux now. I haven't checked for the config.h confusion you report, though - just noting that it built.
-- 
Paul H. Hargrove                          PHHargrove@lbl.gov
Future Technologies Group
HPC Research Department                   Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900
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-- 
Paul H. Hargrove                          PHHargrove@lbl.gov
Future Technologies Group
HPC Research Department                   Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900