[Linuxppc-users] Toolchain version for RHEL 7.1

Wed Nov 14 04:34:00 AEDT 2018

Aha, the loader is actually complaining about missing symbols in *the
loader itself*, not in libc.

This seems strange:
/opt/atl2.0/lib64/ld64.so.2 => /Iib64/ld64.so.2

/opt/atl12.0/lib64/ld64.so.2 should be the dynamic loader provided by the
AT, it should definitely not fall back to using the system dynamic loader
(/lib64/ld64.so.2).

If you run "readelf -l" on your binary, what does it say under the INTERP
segment (it should have something like "Requesting program
interpreter: ...")?

If this does *not* show /opt/atl12.0/lib64/ld64.so.2, then most likely you
did not use the AT to *link* your application.  Note, you specifically need
to use the AT gcc also for the *link* step, not just for the compile steps.

Mit freundlichen Gruessen / Best Regards

Ulrich Weigand

--
  Dr. Ulrich Weigand | Phone: +49-7031/16-3727
  STSM, GNU/Linux compilers and toolchain
  IBM Deutschland Research & Development GmbH
  Vorsitzende des Aufsichtsrats: Martina Koederitz | Geschäftsführung: Dirk
Wittkopp
  Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht
Stuttgart, HRB 243294

From:	Ben Hood <ben at relops.com>
To:	linuxppc-users at lists.ozlabs.org
Date:	13.11.2018 18:25
Subject:	Re: [Linuxppc-users] Toolchain version for RHEL 7.1
Sent by:	"Linuxppc-users" <linuxppc-users-bounces
            +ulrich.weigand=de.ibm.com at lists.ozlabs.org>

Here’s the output from ldd:

$ ldd /tmp/c4/erts-10.1.1/bin/erlc
/tmp/c4/erts-10.1.1/bin/erlc: /lib64/ld64.30.2: version 'GLIBC2.23' not
found (required by /opt/atl2.0/lib64/power8/libc.so.6)
/tmp/c4/erts-10.1.1/bin/erlc: /lib64/ld64.so.2: version 'GLIBC2.22' not
found (required by /opt/atl2.0/lib64/power8/libc.so.6)
    linux-vdso64.so.1 =>   (0x00003fff7acb0000)
    libutil.so.l => /opt/atl2.0/lib64/power8/libutil.so.1
(0x00003fff7ac80000)
    libdl.so.2 => /opt/atl2.0/lib64/power8/libdl.so.2 (0x00003fff7ac50000)
    libm.30.6 => /opt/atl2.0/lib64/power8/libm.so.6 (0x00003fff7aaf0000)
    libc.30.6 => /opt/atl2.0/lib64/power8/libc.so.6 (0x00003fff7a8a0000)
    /opt/atl2.0/lib64/ld64.so.2 => /Iib64/ld64.so.2 (0x000000002d750000

I’m wondering whether when I compiled the binary, I had somehow
compiled/linked against a glibc that is only available on the build
machine, rather than instructing the compiler to 100% link against the
libraries supplied by AT?

      On 13 Nov 2018, at 16:33, Ulrich Weigand <Ulrich.Weigand at de.ibm.com>
      wrote:

      That runtime package is supposed to install the AT glibc
      (under /opt/atX.X/lib64/...).

      The AT dynamic loader (/opt/atX.X/lib64/ld64.so.2) is supposed to
      automatically use the AT libraries, including glibc,
      from /opt/atX.X/lib64/...

      AT-built binaries should have the AT dynamic loader pre-configured so
      they always use it.

      If this doesn't work for you, one of the above three steps must have
      failed somehow. What is the output when running your binary under
      "ldd" ?

      Mit freundlichen Gruessen / Best Regards

      Ulrich Weigand

      --
      Dr. Ulrich Weigand | Phone: +49-7031/16-3727
      STSM, GNU/Linux compilers and toolchain
      IBM Deutschland Research & Development GmbH
      Vorsitzende des Aufsichtsrats: Martina Koederitz | Geschäftsführung:
      Dirk Wittkopp
      Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht
      Stuttgart, HRB 243294

      <graycol.gif>Ben Hood ---13.11.2018 16:28:15---Many thanks for the
      heads up. I’ve installed advance-toolchain-at12.0-runtime on the
      target machine,

      From: Ben Hood <ben at relops.com>
      To: linuxppc-users at lists.ozlabs.org
      Date: 13.11.2018 16:28
      Subject: Re: [Linuxppc-users] Toolchain version for RHEL 7.1
      Sent by: "Linuxppc-users" <linuxppc-users-bounces
      +ulrich.weigand=de.ibm.com at lists.ozlabs.org>

      Many thanks for the heads up.

      I’ve installed advance-toolchain-at12.0-runtime on the target
      machine, but this does not appear to supply a glibc of the required
      version.

      Is this in another AT RPM package?

      Perusing the FAQS

      https://developer.ibm.com/linuxonpower/advance-toolchain/adv-tool-usage/#faq1A

      Indicates that advance-toolchain-at12.0-runtime is mandatory, but I’m
      wondering if a GLIBC_2.23 object is supplied by a different package.
      I guess I could go through and install all of them to find out what
      works, but it feels like glibc is quite a fundamental building block.

      Other FAQs indicate that you can use

      /opt/atX.X/sbin/ldconfig

      To cache the correct library path, but running this hasn’t resolved
      the missing glibc object.

      Am I looking at the wrong FAQs?

      > On 13 Nov 2018, at 13:52, Ulrich Weigand <Ulrich.Weigand at de.ibm.com
      > wrote:
      >
      > The AT uses a completely separate runtime library which is
      incompatible with the system library.
      >
      > In order to run any binary compiled with AT, you must always
      install (at least the runtime components of) the AT on the system
      that is to run the binary.
      >
      >
      > Mit freundlichen Gruessen / Best Regards
      >
      > Ulrich Weigand
      >
      > --
      > Dr. Ulrich Weigand | Phone: +49-7031/16-3727
      > STSM, GNU/Linux compilers and toolchain
      > IBM Deutschland Research & Development GmbH
      > Vorsitzende des Aufsichtsrats: Martina Koederitz |
      Geschäftsführung: Dirk Wittkopp
      > Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht
      Stuttgart, HRB 243294
      >
      > <graycol.gif>Ben Hood ---13.11.2018 14:50:38---Hi list, I’m having
      issues loading the binary I’ve cross compiled for ppc64le/RHEL 7.1:
      >
      > From: Ben Hood <ben at relops.com>
      > To: linuxppc-users at lists.ozlabs.org
      > Date: 13.11.2018 14:50
      > Subject: [Linuxppc-users] Toolchain version for RHEL 7.1
      > Sent by: "Linuxppc-users" <linuxppc-users-bounces
      +ulrich.weigand=de.ibm.com at lists.ozlabs.org>
      >
      >
      >
      >
      > Hi list,
      >
      > I’m having issues loading the binary I’ve cross compiled for
      ppc64le/RHEL 7.1:
      >
      > /lib64/ld64.so.2: version ‘GLIBC_2.23’ not found (required
      by /opt/at12.0/lib64/power8/libm.so.6)
      >
      > The onboard version of glibc appears to be 2.17-157.el7.
      >
      > What is the idiomatic way to supply the required glibc version?
      >
      > Is there some kind of incompatibility between the AT runtime
      version (and the choice of toolchain version on the build machine)?
      Can I solve this issue by using a different version of AT?
      >
      > Thanks in advance,
      >
      > Ben
      >
      >
      > _______________________________________________
      > Linuxppc-users mailing list
      > Linuxppc-users at lists.ozlabs.org
      > https://lists.ozlabs.org/listinfo/linuxppc-users
      >
      >
      >
      >

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