www-client/ungoogled-chromium crashes if compiled with libcxx about gentoo-overlay

[perfect7gentleman]

it's copy from your overlay

[PF4Public]

You're using custom-cflags, try building without.

[PF4Public]

I assume, this solves the issue

[perfect7gentleman]

USE="-custom-cflags" won't help

[PF4Public]

Then, if you want me to help you, please provide more information. Aborted is not enough.

I've inspected your USE flags once more and I see that you're trying to build with libcxx, new-tcmalloc and tcmalloc. There is a problem with libcxx, but I wonder how could you build it successfully. Try disabling libcxx and new-tcmalloc.

BTW: what is the point in copying into your overlay?

[perfect7gentleman]

USE="-custom-cflags -libcxx -new-tcmalloc" helped. thanx.

BTW: what is the point in copying into your overlay?

Really, there is no any sensible reason.
But now I'll enable your repo.

[PF4Public]

I have actually tried building with libcxx and new-tcmalloc, but it failed with re2 library being not build with libcxx… How did you manage to build it? Did you do anything special?

[perfect7gentleman]

I build all deps and related packages with -stdlib=libc++

[PF4Public]

Do you do this by default in your system, or specifically for ungoogled-chromium?

[perfect7gentleman]

It's default for most packages built with Clang

~ $ cat /etc/portage/env/clang_compiler 
CC="clang"
CXX="clang++"
COMMON_FLAGS="-march=native -mtune=native -O2 -pipe -fomit-frame-pointer -fno-plt -fno-stack-protector -flto=thin"
CFLAGS="${COMMON_FLAGS}"
CXXFLAGS="${COMMON_FLAGS} -stdlib=libc++"
FCFLAGS="${COMMON_FLAGS}"
FFLAGS="${COMMON_FLAGS}"
LDFLAGS="-Wl,-O2 -Wl,--as-needed -Wl,--strip-debug -Wl,--thinlto-jobs=9 -flto=thin -fuse-ld=lld"
AR="llvm-ar"
NM="llvm-nm"
RANLIB="llvm-ranlib"

[perfect7gentleman]

before it was possible to build working UGC with USE="custom-cflags libcxx new-tcmalloc"

[PF4Public]

Then I would suggest building it again with libcxx and new-tcmalloc and enable symbols in gn args. Run chromium with gdb and show backtrace to see, what is failing. Unfortunately I cannot promise that I will do this in an immediate future due to the lack of time at present, but if you eager, you may try, but don't enable custom-flags, as it could potentially spoil the result. It could probably give us a clue on what is wrong or what else do we need to patch to make it work.

I will edit and reopen this bug for anyone, who also is trying to build it this way. If you don't mind.

[PF4Public]

libcxx doesn't seem to be used much, so I drop it from ebuild.
One could make this locally if desired.

[perfect7gentleman]

www-client/ungoogled-chromium-80.0.3987.87_p1::pf4public was built with the following:
USE="clang convert-dict cups custom-cflags optimize-thinlto optimize-webui pdf proprietary-codecs pulseaudio system-ffmpeg system-harfbuzz system-icu system-jsoncpp system-libevent system-libvpx system-openh264 system-openjpeg tcmalloc thinlto vaapi -cfi -closure-compile -enable-driver -gnome -gnome-keyring -hangouts -kerberos (-selinux) -suid -widevine" L10N="ru -am -ar -bg -bn -ca -cs -da -de -el -en-GB -es -es-419 -et -fa -fi -fil -fr -gu -he -hi -hr -hu -id -it -ja -kn -ko -lt -lv -ml -mr -ms -nb -nl -pl -pt-BR -pt-PT -ro -sk -sl -sr -sv -sw -ta -te -th -tr -uk -vi -zh-CN -zh-TW" PYTHON_TARGETS="python2_7 python3_8 -python3_6 -python3_7"
CFLAGS="-march=native -mtune=native -O3 -pipe -flto=thin -fomit-frame-pointer -fno-plt -fno-stack-protector -fno-unwind-tables -Wno-unknown-warning-option -Wno-builtin-macro-redefined"
CXXFLAGS="-march=native -mtune=native -O3 -pipe -flto=thin -fomit-frame-pointer -fno-plt -fno-stack-protector -fno-unwind-tables -stdlib=libc++ -Wno-unknown-warning-option -Wno-builtin-macro-redefined"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs ccache config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch parallel-install pid-sandbox preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--strip-debug -Wl,--discard-all -Wl,--thinlto-jobs=9 -fuse-ld=lld -rtlib=compiler-rt -unwindlib=libunwind -s -march=native -mtune=native -O3 -pipe -flto=thin -fomit-frame-pointer -fno-plt -fno-stack-protector -fno-unwind-tables -stdlib=libc++ -Wl,-plugin-opt,-import-instr-limit=30 -Wl,--thinlto-jobs=9"

It works finally.