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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/65176] New: config.guess failed to guess machine with 64-bit kernel and 32-bit user space:
Date: Mon, 23 Feb 2015 15:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65176

            Bug ID: 65176
           Summary: config.guess failed to guess machine with 64-bit
                    kernel and 32-bit user space:
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com

Depending on "uname -m" doesn't work with 64-bit kernel and 32-bit
user space:

bash-4.3# uname -m
x86_64
bash-4.3# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-redhat-linux/4.9.2/lto-wrapper
Target: i686-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap
--enable-shared --enable-threads=posix --enable-checking=release
--enable-multilib --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id --with-linker-hash-style=gnu
--enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto
--enable-plugin --enable-initfini-array --disable-libgcj
--with-isl=/builddir/build/BUILD/gcc-4.9.2-20150212/obj-i686-redhat-linux/isl-install
--with-cloog=/builddir/build/BUILD/gcc-4.9.2-20150212/obj-i686-redhat-linux/cloog-install
--enable-gnu-indirect-function --with-tune=generic --with-arch=i686
--build=i686-redhat-linux
Thread model: posix
gcc version 4.9.2 20150212 (Red Hat 4.9.2-6) (GCC)
bash-4.3# ./config.guess
x86_64-unknown-linux-gnu
bash-4.3#

I am expecting i686-unknown-linux-gnu, not x86_64-unknown-linux-gnu.