GNU Hurd/ open issues/ gdb

Welcome to... ... the GNU Hurd!

Here's what's to be done for maintaining GNU GDB.

  1. General information
  2. Sources
  3. Configuration
  4. Build
    1. Analysis
  5. Install
    1. Analysis
  6. Testsuite
    1. Analysis

General information

Sources

Configuration

Last reviewed up to the Git mirror's ea9812279fe436be9a010d07ef1dbe465199a3d7 (2011-09-07) sources.

  • Globally

    • a.out, COFF, PE image support and 64 bit support are not interesting.

    • In the testsuites, .exp and .d files very likely should not only care for *-*-linux*, but also *-*-gnu*. (If the need to be conditionalized like this at all.)

  • bfd/

    See binutils.

  • libdecnumber/

    Should/can probably align to GNU/Linux.

  • Have a look at config/i386/i386gnu.mh.

  • configure.tgt

    • glibc-tdep et al. also for GNU/Hurd?

  • gdbserver

Build

Here's a log of a GDB build run; this is from our Git repository's 695f61ff0f378e1680964128585044799de27015 (2011-09-06) sources, run on kepler.SCHWINGE and coulomb.SCHWINGE.

$ export LC_ALL=C
$ ../master/configure --prefix="$PWD".install SHELL=/bin/dash CC=gcc-4.6 CXX=g++-4.6 --disable-werror 2>&1 | tee log_build
[...]
$ make 2>&1 | tee log_build_
[...]

Different hosts may default to different shells and compiler versions; thus harmonized.

There are several occurences of error: dereferencing type-punned pointer will break strict-aliasing rules in the MIG-generated stub files; thus no -Werror until that is resolved.

This takes up around 140 MiB and needs roughly 6 min on kepler.SCHWINGE and 30 min on coulomb.SCHWINGE.

Analysis

x86 GNU/Linux' and GNU/Hurd's configurations are slightly different, thus mask out most of the differences that are due to GNU/Linux supporting more core file formats and more emulation vectors.

$ diff -wu <(ssh kepler.SCHWINGE 'cd tmp/source/gdb/ && cat hurd/master.build/log_build* | sed -e "s%\(/media/data\)\?${PWD}%[...]%g"' | sed -f open_issues/gdb/log_build-linux.sed) <(ssh coulomb.SCHWINGE 'cd tmp/gdb/ && cat hurd/master.build/log_build* | sed "s%\(/media/erich\)\?${PWD}%[...]%g"' | sed -f open_issues/gdb/log_build-hurd.sed) > open_issues/gdb/log_build.diff

log build.diff.

  • Why do we specify -D_GNU_SOURCE, and GNU/Linux doesn't?

  • Why does GNU/Linux have an additional -ldl -rdynamic when linking gdb?

Install

$ make install 2>&1 | tee log_install
[...]

This takes up around 50 MiB, and needs roughly 1 min on kepler.SCHWINGE and 3 min on coulomb.SCHWINGE.

Analysis

$ diff -wu <(ssh kepler.SCHWINGE 'cd tmp/source/gdb/ && cat hurd/master.build/log_install | sed -e "s%\(/media/data\)\?${PWD}%[...]%g"' | sed -f open_issues/gdb/log_install-linux.sed) <(ssh coulomb.SCHWINGE 'cd tmp/gdb/ && cat hurd/master.build/log_install | sed "s%\(/media/erich\)\?${PWD}%[...]%g"' | sed -f open_issues/gdb/log_install-hurd.sed) > open_issues/gdb/log_install.diff

log install.diff.

  • libtool: finish: ldconfig is not run for the Hurd.

Testsuite

On GNU/Hurd, hampered by the term blocking issue.

$ make -k check
[...]

This needs roughly 45 min on kepler.SCHWINGE and TODO min on coulomb.SCHWINGE.

$ ssh kepler.SCHWINGE 'cd tmp/source/gdb/ && sed < hurd/master.build/gdb/testsuite/gdb.sum -e "s%\(/media/data\)\?${PWD}%[...]%g"' > open_issues/gdb/sum_linux
$ ssh coulomb.SCHWINGE 'cd tmp/gdb/ && sed < hurd/master.build/gdb/testsuite/gdb.sum -e "s%\(/media/erich\)\?${PWD}%[...]%g"' > open_issues/gdb/sum_hurd

Comparing the results files, sum linux to ?sum hurd:

$ diff -u -F ^Running open_issues/gdb/sum_linux open_issues/gdb/sum_hurd > open_issues/gdb/sum.diff

?sum.diff.

Analysis

TODO.