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diff --git a/open_issues/binutils.mdwn b/open_issues/binutils.mdwn new file mode 100644 index 00000000..8d6b3a94 --- /dev/null +++ b/open_issues/binutils.mdwn @@ -0,0 +1,205 @@ +[[!meta copyright="Copyright © 2007, 2008, 2010, 2011, 2012 Free Software +Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled [[GNU Free Documentation +License|/fdl]]."]]"""]] + +[[!tag stable_URL open_issue_binutils]] + +Here's what's to be done for maintaining GNU Binutils. + +As these tools primarily deal with low-level parts of the target architecture +and the object file format (ELF ABI), which are essentially (at least meant to +be) the same, there shouldn't be many differences comparing the binutils +between the GNU/Hurd and GNU/Linux ports, for example. There are a few, +though, as explained below. + +[[!toc levels=2]] + + +# [[General information|/binutils]] + + +# [[Sources|source_repositories/binutils]] + + +# Configuration + +<!-- + +git checkout reviewed +git log --reverse --pretty=fuller --stat=$COLUMNS,$COLUMNS -p -C --cc ..sourceware/master +-i +/^commit |^---$|hurd|linux|nacl + +--> + +Last reviewed up to the [[Git mirror's dde164167b2db4c05d58b1941d610beb6d5ca99f +(2012-06-08) sources|source_repositories/binutils]]. + + * Globally + + * a.out (such as `ld/emulparams/i386linux.sh`, `ld/emultempl/linux.em`, + etc.), 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 they need to be + conditionalized like this at all.) + + * `bfd/` + + * `config.bfd` + + * `i[3-7]86-*-gnu*` + + Comparing to `i[3-7]86-*-linux-*`: + + * `i386linux_vec` -- a.out. + + * `i386pei_vec` -- PE. + + * 64 bit. + + * `configure.host` + + Souldn't need anything. x86 Linux neither. + + * `configure.in` + + Linux: + + * `COREFILE=trad-core.lo` with `TRAD_HEADER='"hosts/i386linux.h"'` + + We don't have any such core file support configured. TODO: should + we? Where is this core file reading exactly used? GDB? + + * `i386linux_vec` -- a.out. + + * `i386pei_vec` -- PE. + + * `binutils/` + + * `configure.tgt` + + * `gas/` + + * `config/te-gnu.h` + + C.f. `te-linux.h`; search tree for `TE_LINUX` vs. `TE_GNU` usage. + + * `tc-i386.h` + + Sole `TE_LINUX` usage is for a.out. + + * `configure.tgt` + + * `ld/` + + * `configure.host` + + * `*-*-gnu*` + + TODO: resolve `crt0.o` vs. `crt1.o` issue. [[Testsuite + failures|binutils#static]]. + + * `configure.tgt` + + * `i[3-7]86-*-gnu*` + + Compare to `i[3-7]86-*-linux-*`, but don't need a.out (`i386linux`) + and 64 bit support. + + +# Build + +Here's a log of a binutils build run; this is from our [[Git repository's +e1104996559067c40207c803ab1a5847a4a05145 (2012-06-07) +sources|source_repositories/binutils]], 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 2>&1 | tee log_build + [...] + $ make 2>&1 | tee log_build_ + [...] + +Different hosts may default to different shells and compiler versions; thus +harmonized. + +This takes up around 120 MiB, and needs roughly 4 min on kepler.SCHWINGE and +15 min on coulomb.SCHWINGE. + +<!-- + + $ (make && touch .go-install) 2>&1 | tee log_build_ && test -f .go-install && (make install && touch .go-check) 2>&1 | tee log_install && test -f .go-check && make -k check 2>&1 | tee log_check + +--> + + +## 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. + + $ ssh kepler.SCHWINGE 'cd tmp/source/binutils/ && cat hurd/master.build/log_build* | sed -e "s%\(/media/data\)\?${PWD}%[...]%g"' > toolchain/logs/binutils/linux/log_build + $ ssh coulomb.SCHWINGE 'cd tmp/binutils/ && cat hurd/master.build/log_build* | sed -e "s%\(/media/erich\)\?${PWD}%[...]%g"' > toolchain/logs/binutils/hurd/log_build + $ diff -wu <(sed -f toolchain/logs/binutils/linux/log_build.sed < toolchain/logs/binutils/linux/log_build) <(sed -f toolchain/logs/binutils/hurd/log_build.sed < toolchain/logs/binutils/hurd/log_build) > toolchain/logs/binutils/log_build.diff + + +# Install + + $ make install 2>&1 | tee log_install + [...] + +This takes up around 70 MiB, and needs roughly 1 min on kepler.SCHWINGE and 3 +min on coulomb.SCHWINGE. + + +## Analysis + + $ ssh kepler.SCHWINGE 'cd tmp/source/binutils/ && cat hurd/master.build/log_install | sed -e "s%\(/media/data\)\?${PWD}%[...]%g"' > toolchain/logs/binutils/linux/log_install + $ ssh coulomb.SCHWINGE 'cd tmp/binutils/ && cat hurd/master.build/log_install | sed -e "s%\(/media/erich\)\?${PWD}%[...]%g"' > toolchain/logs/binutils/hurd/log_install + $ diff -wu <(sed -f toolchain/logs/binutils/linux/log_install.sed < toolchain/logs/binutils/linux/log_install) <(sed -f toolchain/logs/binutils/hurd/log_install.sed < toolchain/logs/binutils/hurd/log_install) > toolchain/logs/binutils/log_install.diff + + * `libtool: finish`: `ldconfig` is not run for the Hurd. + + +# Testsuite + + $ make -k check + [...] + +This needs roughly 3 min on kepler.SCHWINGE and 13 min on coulomb.SCHWINGE. + + $ ssh kepler.SCHWINGE 'cd tmp/source/binutils/ && cat hurd/master.build/*/*.sum hurd/master.build/*/*/*.sum | sed -e "s%\(/media/data\)\?${PWD}%[...]%g"' > toolchain/logs/binutils/linux/sum + $ ssh coulomb.SCHWINGE 'cd tmp/binutils/ && cat hurd/master.build/*/*.sum hurd/master.build/*/*/*.sum | sed -e "s%\(/media/erich\)\?${PWD}%[...]%g"' > toolchain/logs/binutils/hurd/sum + $ diff -u -F ^Running toolchain/logs/binutils/linux/sum toolchain/logs/binutils/hurd/sum > toolchain/logs/binutils/sum.diff + + +## Analysis + + * <a name="static"><!-- stable_URL -->`FAIL: static [...]`</a> + + The testsuite isn't prepared for using `crt0.o` instead of `crt1.o` + depending on whether a static or dynamic executable is created. Documented + in `ld/configure.host`. Perhaps we should finally rewrite this messy code + in glibc? + + * <a name="64ksec">`FAIL: ld-elf/64ksec`</a> + + On the idle grubber, this one takes a few minutes wall time to complete + successfully ([[I/O system + weakness|performance/io_system/binutils_ld_64ksec]]), so assuming some + system load variation, the testsuite's timeout may trigger. + + * <a name="weak"><!-- stable_URL -->`FAIL: ELF weak [...]`</a> + + [[I|tschwinge]] suppose this is due to us having an override w.r.t. weak + symbol handling in glibc, needed for our external [[/libpthread]]. TODO: + document properly. |