Re: [gentoo-dev] sys-devel/gcc::mgorny up for testing

[Tomas Mozes]

On 2014-12-07 11:37, Michał Górny wrote:
> Hello, developers and users.
>
> As some of you know, the toolchain packages in Gentoo suffer from
> lack-of-sanity issues and their maintainers are completely unwilling to
> improve things. I have finally decided to start working on a fork of
> the sys-devel/gcc ebuilds, and I have some bits ready for initial
> testing in 'mgorny' repo, so I would like to know your opinion.
>
>
> Before you start, the shortcomings are:
>
> 1. No cross-compilation support. If the project proves being a success
> it will be readded at some point. However, I will likely fork glibc
> first and work on a sane crossdev alternative.
>
> 2. No gcj support. Since the ebuild has been forked out of
> toolchain.eclass, and the gcj support suffers a lot of issues there, I
> decided there's no point in copying the code. Not sure if anybody
> actually uses it, and if it is actually useful for anything but will
> probably get reintroduced one day [above 'if' applies too].
>
> 3. No bootstrapping, fallbacks and possible some other random feature
> support. The goal was pretty much to get gcc compiling first, and avoid
> awful lot of effort if things prove to have no future.
>
> 4. Hardened is not tested. I think I have copied all the needed code
> and fixed some stuff but I have no clue if it still works ;).
>
>
> Now, the major changes are:
>
> 1. Most of the insanity removed. No more toolchain.eclass. The ebuild
> has just the code for the current gcc version. You can read it and know
> what it does, you don't have to parse a few dozen version conditionals,
> runtime conditionals and random crap code that doesn't do anything in
> some gcc versions. In fact, I think I removed most of the no-op code.
> And now you can actually change something in the ebuild without caring
> for gcc3.4, or without breaking stuff for stable ebuilds.
>
> 2. USE flags are supposed to work. I've replaced the cases when they
> were silently ignored with REQUIRED_USE. I've also removed the silent
> removals when they didn't work -- so if your current toolchain is
> broken, things may actually fail instead of giving your different gcc
> than you wanted. Probably deserves explanatory pkg_pretend() at some
> point, with messages like 'disable USE=-foo because your toolchain is
> broken'.
>
> 3. Things simplified where they could have been simplified. For
> example, I removed the big gcc executable moving function and replaced
> it with --enable-version-specific-runtime-libs. It was enabled in
> toolchain.eclass with a comment 'If we enable it on non-Darwin we screw
> up the behaviour this eclass relies on.' So yep, precious cargo cult --
> why enable something that would require you to remove your useless
> complex function?!
>
> 4. Added gx86-multilib love. Now you have abi_* flags to control
> the compiler runtime. Of course, since gcc is a pile of random modules
> not fit for one another it has different code for different targets. In
> particular, on mips you can't do two ABIs -- either single one
> (non-multilib) or all three of them (--enable-multilib).
>
> 5. Added multilib gcc wrappers. Long story short, multilib gcc now
> shows up in gcc-config alike crossdev -- but unlike i686 crossdev, it
> doesn't screw up your system! Of course, the final implementation may
> differ since it's an early idea but it works. Now distcc happily builds
> stuff for your x86 clients.
>
> 6. Added missing dependencies. Yep, USE flags now, say, pull in doxygen
> rather than silently skipping doc build when it's not installed...
>
> 7. Disabled bootstrap by default (and in fact completely for now). It
> is not *that* useful, and means time savings (and distcc support):
>
>      Thu Nov  6 20:39:31 2014 >>> sys-devel/gcc-4.9.2
>        merge time: 1 hour, 56 minutes and 43 seconds.
>
>      Sun Dec  7 10:46:08 2014 >>> sys-devel/gcc-4.9.2-r100
>        merge time: 34 minutes and 55 seconds.
>
>
> If you're interested in testing it, 'layman -a mgorny' and enjoy. I'd
> appreciate any bug reports, except for those covering things i've
> already listed as missing :). Any further comments will be very helpful
> in deciding on the way forward.
>
> If there is a real interest in my fork, I will probably move it to gx86
> as sys-devel/gcc-mgorny. I will also be happy to work on replacing
> the new versions of original sys-devel/gcc completely. With QA process
> against toolchain.eclass if necessary.

Thanks, I've tried this on ~amd64. It builds in 10 minutes (wow!), 
tested to build some core stuff with it:
kernel 3.17, glibc, coreutils, openssl, ssh...

All seems to work fine. I'll try to recompile the whole machine with it.

After emerge, there are these notices:
  * QA Notice: command not found:
  *
  *      /var/tmp/portage/sys-devel/gcc-4.9.2-r100/temp/environment: line 
3110: pax-mark: command not found
  *      /var/tmp/portage/sys-devel/gcc-4.9.2-r100/temp/environment: line 
3111: pax-mark: command not found

# emerge -pvq gcc
[ebuild   R   ] sys-devel/gcc-4.9.2-r100  USE="cxx fortran nls nptl 
openmp pie sanitize (-altivec) -doc (-fixed-point) -go -graphite 
(-hardened) (-libssp) -objc -objc++ -objc-gc {-test} -vanilla" 
ABI_X86="(64) -32 (-x32)"

Portage 2.2.14 (python 2.7.8-final-0, default/linux/amd64/13.0/desktop, 
gcc-4.9.2, glibc-2.20, 3.17.5-gentoo x86_64)
=================================================================
System uname: 
Linux-3.17.5-gentoo-x86_64-Intel-R-_Core-TM-_i5-3570_CPU_@_3.40GHz-with-gentoo-2.2
KiB Mem:    15908668 total,  12616592 free
KiB Swap:          0 total,         0 free
Timestamp of tree: Tue, 09 Dec 2014 02:45:01 +0000
ld GNU ld (Gentoo 2.24 p1.4) 2.24
app-shells/bash:          4.3_p30-r1
dev-java/java-config:     2.2.0
dev-lang/perl:            5.20.1-r3
dev-lang/python:          2.7.8, 3.2.5-r4, 3.3.5-r1, 3.4.2
dev-util/cmake:           3.0.2
dev-util/pkgconfig:       0.28-r2
sys-apps/baselayout:      2.2
sys-apps/openrc:          0.13.6
sys-apps/sandbox:         2.6-r1
sys-devel/autoconf:       2.13, 2.69
sys-devel/automake:       1.14.1
sys-devel/binutils:       2.24-r3
sys-devel/gcc:            4.8.3, 4.9.2-r100::mgorny
sys-devel/gcc-config:     1.8
sys-devel/libtool:        2.4.3-r2
sys-devel/make:           4.1-r1
sys-kernel/linux-headers: 3.17-r1 (virtual/os-headers)
sys-libs/glibc:           2.20
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="*"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-mtune=native -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d 
/etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release 
/etc/php/apache2-php5.5/ext-active/ /etc/php/apache2-php5.6/ext-active/ 
/etc/php/cgi-php5.5/ext-active/ /etc/php/cgi-php5.6/ext-active/ 
/etc/php/cli-php5.5/ext-active/ /etc/php/cli-php5.6/ext-active/ 
/etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-mtune=native -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified 
distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch 
preserve-libs protect-owned sandbox sfperms strict unknown-features-warn 
unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync 
xattr"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://tux.rainside.sk/gentoo/"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j4"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times 
--omit-dir-times --compress --force --whole-file --delete --stats 
--human-readable --timeout=180 --exclude=/distfiles --exclude=/local 
--exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
USE="X a52 aac acl acpi alsa amd64 berkdb bindist branding bzip2 cairo 
cdda cdr cli consolekit cracklib crypt cups cxx dbus dri dts dvd dvdr 
emboss encode exif fam firefox flac fortran gdbm gif glamor gpm gtk 
iconv jpeg lcms ldap libnotify mad mmx mng modules mp3 mp4 mpeg multilib 
ncurses nls nptl ogg opengl openmp pam pango pcre pdf png policykit ppds 
qt3support qt4 readline sdl session sse sse2 ssl startup-notification 
svg tcpd tiff truetype udev udisks unicode upower usb vorbis wxwidgets 
x264 xattr xcb xml xv xvid zlib" ABI_X86="64" ALSA_CARDS="ali5451 
als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 
es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident 
usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core 
authz_core authz_host dir mime unixd socache_shmcb log_config rewrite 
vhost_alias log_forensic proxy proxy_fcgi info status deflate filter 
auth_digest authn_file authz_user access_compat actions alias auth_basic 
authn_alias authn_anon env expires headers mime_magic negotiation 
reqtimeout setenvif unique_id version cgi" CALLIGRA_FEATURES="kexi words 
flow plan sheets stage tables krita karbon braindump author" 
CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool 
swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate 
evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom 
oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing 
tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64 pc" 
INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz 
cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" 
LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" 
LINGUAS="en" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-6 
php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 
python3_3" QEMU_SOFTMMU_TARGETS="x86_64 i386" QEMU_USER_TARGETS="x86_64 
i386" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="intel 
i128" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset 
ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark 
ipmark dhcpmac delude chaos account"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, 
LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, 
PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON