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Building Chromium on 32-bit x86(?)
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Ant P.
Watchman
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Joined: 18 Apr 2009
Posts: 5720

PostPosted: Tue Sep 27, 2016 11:11 pm    Post subject: Building Chromium on 32-bit x86(?) Reply with quote

The Chromium ebuild says I need 3GB of RAM. My laptop only has 2GB (maximum the chipset will recognise). But I wouldn't be much of a Gentoo user if I just took a warning saying it's impossible at face value. And besides, I used to build older versions of this with only 1GB.

So I'm trying to do it anyway, haven't had much success so far. Thankfully ccache takes away 90% of the compilation time, but the first few runs consistently explode at what looks like the very end:
Code:
[21397/21397] i686-pc-linux-gnu-g++ -pie -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -Wl,-z,defs -pthread -m32 -Wl,-O1 -Wl,--gc-sections -Wl,--no-as-needed -lpthread -Wl,--as-needed -Wl,-rpath-link=../Release -Wl,--disable-new-dtags -Wl,--export-dynamic -Wl,--sort-common,--hash-style=gnu,-z,combreloc,--no-keep-memory -o "./chrome" -Wl,--start-group @"./chrome.rsp"  -Wl,--end-group  -ldl -lrt -lpangocairo-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lcairo -lX11 -lXcomposite -lXcursor -lXdamage -lXext -lXfixes -lXi -lXrender -lXtst -lgmodule-2.0 -lgthread-2.0 -lsmime3 -lnss3 -lnssutil3 -lplds4 -lplc4 -lnspr4 -lexpat -lxml2 -lfontconfig -ldbus-1 -latomic -lresolv -lgio-2.0 -lz -lfreetype -lXss -lharfbuzz-icu -lharfbuzz -lpng16 -ljpeg -lXrandr -lre2 -lsnappy -latk-1.0 -lavcodec -lavformat -lavutil -lvpx -lm -lasound -lFLAC -lminizip -lgtk-x11-2.0 -lgdk-x11-2.0 -lgdk_pixbuf-2.0 -lpangoft2-1.0 -lwebp -lwebpdemux -lxslt
FAILED: chrome
i686-pc-linux-gnu-g++ -pie -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -Wl,-z,defs -pthread -m32 -Wl,-O1 -Wl,--gc-sections -Wl,--no-as-needed -lpthread -Wl,--as-needed -Wl,-rpath-link=../Release -Wl,--disable-new-dtags -Wl,--export-dynamic -Wl,--sort-common,--hash-style=gnu,-z,combreloc,--no-keep-memory -o "./chrome" -Wl,--start-group @"./chrome.rsp"  -Wl,--end-group  -ldl -lrt -lpangocairo-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lcairo -lX11 -lXcomposite -lXcursor -lXdamage -lXext -lXfixes -lXi -lXrender -lXtst -lgmodule-2.0 -lgthread-2.0 -lsmime3 -lnss3 -lnssutil3 -lplds4 -lplc4 -lnspr4 -lexpat -lxml2 -lfontconfig -ldbus-1 -latomic -lresolv -lgio-2.0 -lz -lfreetype -lXss -lharfbuzz-icu -lharfbuzz -lpng16 -ljpeg -lXrandr -lre2 -lsnappy -latk-1.0 -lavcodec -lavformat -lavutil -lvpx -lm -lasound -lFLAC -lminizip -lgtk-x11-2.0 -lgdk-x11-2.0 -lgdk_pixbuf-2.0 -lpangoft2-1.0 -lwebp -lwebpdemux -lxslt
/usr/lib/gcc/i686-pc-linux-gnu/5.4.0/../../../../i686-pc-linux-gnu/bin/ld: fatal error: ./chrome: mmap: failed to allocate 194546060 bytes for output file: Cannot allocate memory
collect2: error: ld returned 1 exit status
distcc[2152] ERROR: compile (null) on localhost failed
ninja: build stopped: subcommand failed.

ld is running out of memory trying to mmap, which is a problem. I can't give it more. The warning says 3GB though, and I've got 2GB RAM + 2.75GB swap. It seems like it's ignoring the swap space completely and not even trying.

Things I haven't tried:
  • ld.bfd — maybe it'll be more swap-friendly than ld.gold
  • Adding LDFLAGS="-Wl,--reduce-memory-overheads" (which doesn't seem to be a valid ld.gold option) — the 40% reduction in the manpage sounds promising.

(Doing a build with the latter now, will update with results...)
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Ant P.
Watchman
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Joined: 18 Apr 2009
Posts: 5720

PostPosted: Wed Sep 28, 2016 1:02 am    Post subject: Reply with quote

It works!
Code:
>>> Verifying ebuild manifests
>>> Running pre-merge checks for www-client/chromium-54.0.2840.34
 * Checking for at least 3 GiB RAM ...
 * There is NOT at least 3 GiB RAM
 * Checking for at least 5 GiB disk space at "/var/tmp/portage/www-client/chromium-54.0.2840.34/temp" ...
 *
 * Space constraints set in the ebuild were not met!
 * The build will most probably fail, you should enhance the space
 * as per failed tests.
 *
>>> Emerging (1 of 1) www-client/chromium-54.0.2840.34::gentoo
>>> Installing (1 of 1) www-client/chromium-54.0.2840.34::gentoo
>>> Recording www-client/chromium in "world" favorites file...
>>> Jobs: 1 of 1 complete                           Load avg: 1.45, 1.41, 1.63

~ # qlop -tHl chromium
Wed Sep 28 01:47:57 2016 >>> www-client/chromium-54.0.2840.34
chromium: 1 hour, 35 minutes, 58 seconds for 1 merges

~ # lscpu
Architecture:          i686
CPU op-mode(s):        32-bit
Byte Order:            Little Endian
CPU(s):                2
On-line CPU(s) list:   0,1
Thread(s) per core:    2
Core(s) per socket:    1
Socket(s):             1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 28
Model name:            Intel(R) Atom(TM) CPU N270   @ 1.60GHz
Stepping:              2
CPU MHz:               1600.000
CPU max MHz:           1600.0000
CPU min MHz:           800.0000
BogoMIPS:              3193.12
L1d cache:             24K
L1i cache:             32K
L2 cache:              512K
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts aperfmperf eagerfpu pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm movbe lahf_lm dtherm

~ # free -m
              total        used        free      shared  buff/cache   available
Mem:           2013          32        1392           0         588        1720
Swap:          2740          12        2728


For reference, here's everything I ended up adding:
/etc/portage/package.use/chromium.conf:
www-client/chromium -hangouts -suid -tcmalloc

/etc/portage/package.env/chromium-x86.conf:
www-client/chromium ccache.conf chromium-lowmem.conf

/etc/portage/env/ccache.conf:
FEATURES=ccache

/etc/portage/env/chromium-lowmem.conf:
I_KNOW_WHAT_I_AM_DOING=1
LDFLAGS="-Wl,--sort-common,--hash-style=gnu,-z,combreloc,--no-keep-memory,--reduce-memory-overheads"

--reduce-memory-overheads, or the combination of that plus ld.bfd, was what got it to work. The rest probably doesn't factor into fixing the OOM problem but it's here in case.

Anyway, I hope burning 36 hours of CPU time for science helps someone else out there.
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fedeliallalinea
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Joined: 08 Mar 2003
Posts: 21683
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PostPosted: Wed Sep 28, 2016 5:50 am    Post subject: Re: Building Chromium on 32-bit x86(?) Reply with quote

Ant P. wrote:
I can't give it more. The warning says 3GB though, and I've got 2GB RAM + 2.75GB swap. It seems like it's ignoring the swap space completely and not even trying.

Just for info read this post of Hu
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