[Llvm-bgq-discuss] About that debugging stuff ....

[Biddiscombe, John A.]

Greetings people.

Having not used the BGAS machine for the summer and now getting back to it, I did a clean install of many things and setup my system as follows

NB. current is r209570-20140527

  export CLANG_ROOT=/gpfs/bbp.cscs.ch/home/biddisco/apps/clang/bgclang/current
  export CC=$CLANG_ROOT/bin/clang
  export CXX=$CLANG_ROOT/bin/clang++
  export PATH=$CLANG_ROOT/bin:$PATH
  export LDFLAGS="-dynamic"
  export CFLAGS="-mcpu=a2 -std=c99"

  export GCC_TOOOLCHAIN=/gpfs/bbp.cscs.ch/home/biddisco/clang/V1R2M1_base_4.7.2/gnu-linux-4.7.2/powerpc64-bgq-linux/include/c++/4.7.2
  export GCC_TOOLCHAIN_INCLUDE=$GCC_TOOOLCHAIN/powerpc64-bgq-linux
  export CLANG_LIBCPP=$CLANG_ROOT/libc++/lib
  export SYS_LIBSTDCPP=/gpfs/bbp.cscs.ch/home/biddisco/clang/V1R2M1_base_4.7.2/gnu-linux-4.7.2/powerpc64-bgq-linux/lib/
  export CPPFLAGS="-mcpu=a2 --std=c++11 -stdlib=libc++ -I$GCC_TOOOLCHAIN -I$GCC_TOOLCHAIN_INCLUDE -L$CLANG_LIBCPP -L$SYS_LIBSTDCPP  -L/bgsys/drivers/ppcfloor/gnu-linux-4.7.2/powerpc64-bgq-linux/lib -lstdc++"
  export CXXFLAGS=$CPPFLAGS
  export LD_LIBRARY_PATH=$CLANG_ROOT/libc++/lib:$SYS_LIBSTDCPP:$LD_LIBRARY_PATH

and so I'm using c++11, libc++ from clang, and libstdc++ from the 4.7.2 toolchain - and *NOT* using the bgclang wrapper scripts because I'm on the linux IO nodes and not the compute nodes.

Great news is that applications compile link and run. (yay!). Thanks Hal and your colleagues for the ongoing support. (It's getting like I *almost*  know what I'm doing now that I can fool the compiler into working as expected!)

But here's something interesting : when I gdb a test program, and do a list before running anything, it shows me the ELF init stuff

GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
...
Reading symbols from /gpfs/bbp.cscs.ch/home/biddisco/bgas/clang/build/skv/skv_server...done.
(gdb)
(gdb) list
1    /* Startup support for ELF initializers/finalizers in the main executable.
2       Copyright (C) 2002, 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
3       This file is part of the GNU C Library.
4
5       The GNU C Library is free software; you can redistribute it and/or
6       modify it under the terms of the GNU Lesser General Public
7       License as published by the Free Software Foundation; either
8       version 2.1 of the License, or (at your option) any later version.
9
10      In addition to the permissions in the GNU Lesser General Public
(gdb) run
Starting program: /gpfs/bbp.cscs.ch/home/biddisco/bgas/clang/build/skv/skv_server
Missing separate debuginfo for /gpfs/bbp.cscs.ch/home/biddisco/apps/clang/bgclang/current/libc++/lib/libc++.so.1
Try: yum --disablerepo='*' --enablerepo='*-debug*' install /usr/lib/debug/.build-id/85/2e450ebcbf27794ca5453b99a9e19311bfe3f4.debug
[Thread debugging using libthread_db enabled]

but as soon as I 'run', the node hangs and I have to reboot it.
It doesn't do that without the debugger AFAICT.

Am I missing an important SLEEF related issue/link. I have no real clue what sleef is for, but it is prominent in the clang wrappers and maybe I need it for the correct init.

Thanks for any advice. (I'll be googling sleef whilst waiting for the USA to wake up).

JB

--
John Biddiscombe,                        email:biddisco @.at.@ cscs.ch
http://www.cscs.ch/
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Trevano 131, 6900 Lugano, Switzerland   | Fax:  +41 (91) 610.82.82

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