When emerging dev-qt/qtwebengine-6.7.3: In file included from ../../../../../qtwebengine-everywhere-src-6.7.3/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/db/storage/numeric_storage.h:19, from ../../../../../qtwebengine-everywhere-src-6.7.3/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/db/storage/numeric_storage.cc:18: /usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/variant: In instantiation of ‘constexpr std::add_pointer_t<_Tp> std::get_if(variant<_Types ...>*) [with _Tp = double; _Types = {unsigned int, int, long int, long double}; add_pointer_t<_Tp> = double*]’: ../../../../../qtwebengine-everywhere-src-6.7.3/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/db/storage/numeric_storage.cc:248:50: required from here 248 | } else if (const auto* db = std::get_if<double>(&*val)) { | ~~~~~~~~~~~~~~~~~~~^~~~~~~ /usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/variant:1219:42: error: static assertion failed: T must occur exactly once in alternatives 1219 | static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, | ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Reproducible: Always Steps to Reproduce: 1. emerge --ask -1 dev-qt/qtwebengine Actual Results: Build fails Expected Results: Build completes successfully # emerge --info Portage 3.0.66.1 (python 3.12.8-final-0, default/linux/amd64/23.0/split-usr, gcc-14, glibc-2.40-r5, 6.6.47-gentoo-blackbird-33 x86_64) ================================================================= System uname: Linux-6.6.47-gentoo-blackbird-33-x86_64-AMD_Ryzen_5_3600_6-Core_Processor-with-glibc2.40 KiB Mem: 32797544 total, 4604744 free KiB Swap: 33554424 total, 33554424 free Timestamp of repository gentoo: Mon, 23 Dec 2024 01:45:00 +0000 Head commit of repository gentoo: 53291eea1ffa480302c43b4f07935755f0f277a3 sh bash 5.2_p37 ld GNU ld (Gentoo 2.42 p6) 2.42.0 distcc 3.4 x86_64-pc-linux-gnu [disabled] ccache version 4.10.2 [disabled] app-misc/pax-utils: 1.3.8::gentoo app-shells/bash: 5.2_p37::gentoo dev-build/autoconf: 2.13-r8::gentoo, 2.71-r7::gentoo, 2.72-r1::gentoo dev-build/automake: 1.16.5-r2::gentoo dev-build/cmake: 3.30.6::gentoo dev-build/libtool: 2.4.7-r4::gentoo dev-build/make: 4.4.1-r100::gentoo dev-build/meson: 1.5.2::gentoo dev-java/java-config: 2.3.4::gentoo dev-lang/perl: 5.40.0::gentoo dev-lang/python: 3.10.14_p1::gentoo, 3.11.11_p1::gentoo, 3.12.8::gentoo, 3.13.1::gentoo dev-lang/rust: 1.79.0-r100::gentoo, 1.80.1-r100::gentoo, 1.81.0-r100::gentoo, 1.82.0-r101::gentoo dev-lang/rust-bin: 1.79.0-r100::gentoo dev-util/ccache: 4.10.2-r1::gentoo llvm-core/clang: 15.0.7-r3::gentoo, 17.0.6::gentoo, 18.1.8-r6::gentoo, 19.1.4::gentoo llvm-core/lld: 17.0.6::gentoo, 18.1.8::gentoo, 19.1.4::gentoo llvm-core/llvm: 13.0.1::gentoo, 15.0.7-r3::gentoo, 17.0.6::gentoo, 18.1.8-r6::gentoo, 19.1.4::gentoo sys-apps/baselayout: 2.17::gentoo sys-apps/openrc: 0.55.1::gentoo sys-apps/sandbox: 2.39::gentoo sys-devel/binutils: 2.42-r2::gentoo, 2.43-r2::gentoo 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CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="load memory syslog write_prometheus cpu cpufreq df nfs processes swap interface" CPU_FLAGS_X86="mmx mmxext sse sse2 sse3 sse4_1 ssse3" CURL_SSL="openssl" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax navcom oceanserver oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 tsip tripmate tnt ublox" GUILE_SINGLE_TARGET="3-0" GUILE_TARGETS="3-0" INPUT_DEVICES="libinput evdev keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz glk hd44780 lb216 lcdm001 mtxorb text" LLVM_TARGETS="AMDGPU BPF WebAssembly X86" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php8-2" POSTGRES_TARGETS="postgres16" PYTHON_SINGLE_TARGET="python3_12" PYTHON_TARGETS="python3_11 python3_12" QEMU_SOFTMMU_TARGETS="x86_64 alpha arm aarch64 hppa i386 mips mips64 ppc ppc64 sparc sparc64" QEMU_USER_TARGETS="alpha arm armeb aarch64 hppa i386 m68k mips 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Created attachment 914798 [details] build.log
Created attachment 914799 [details] environment
Additional info: on a different Ryzen machine, with completely different environment it just builds fine. It fails to build only on/for this older Xeon.
Never seen anyone else run into this so far (nor do I) so I have no idea (not savy in C++ either), albeit the offending line (among others similar ones) was changed in qtwebengine-6.8.1 from: } else if (const auto* db = std::get_if<double>(&*val)) { to: } else if (const auto* db = std::get_if<double>(&val)) { qtwebengine-6.8.1 is due to be stabilized in a few days (bug #946705), so odds are won't look at 6.7.3 anymore. So you may want to try building Qt 6.8.1 to see if it fares better, you can package.accept_keywords all of qt 6.8.1 ahead of time with a single line: dev-qt/*:6/6.8.1 May also need to accept keywords some pyqt6 or pyside6 packages *if* you use them though, these are due to be stabilized at same time.
Actually... my bad! Sorry for that! Comparing to my other system, I realized some years ago I added for some reason this: " -mfpmath=both" to CFLAGS. It worked without any hiccup till this update. Removing " -mfpmath=both" from CFLAGS actually made qtwebengine build again, and update freecad to 1.0. Can it be a GCC 14 quirk?
Not 100% sure, but I don't really see how it could affect this (not that it makes sense to have it in *FLAGS either way). "Maybe" you're just hitting some "random" build failure due to hardware issues or quirks, these RDRND message are notably concerning... and then it just happened to randomly work when you tried again (or had you tried multiple times already?) Either way, I'll assume that there's nothing for us to do here, so I'll close this.
(In reply to Ionen Wolkens from comment #6) > Not 100% sure, but I don't really see how it could affect this (not that it > makes sense to have it in *FLAGS either way). > > "Maybe" you're just hitting some "random" build failure due to hardware > issues or quirks, these RDRND message are notably concerning... and then it > just happened to randomly work when you tried again (or had you tried > multiple times already?) > > Either way, I'll assume that there's nothing for us to do here, so I'll > close this. Definitely not random. Even after successfully emerging without the CFLAG, reintroducing the -mfpmath=both CFLAG produces the same build error again. Probably it's not a heavily used/tested feature of GCC, and is not working properly. The docs says: Generate floating-point arithmetic for selected unit unit. The choices for unit are: 387,SSE,Both Attempt to utilize both instruction sets at once. This effectively doubles the amount of available registers, and on chips with separate execution units for 387 and SSE the execution resources too. Use this option with care, as it is still experimental, because the GCC register allocator does not model separate functional units well, resulting in unstable performance. The thing is, even 18 years ago, the documentation was the same: stating that this feature is experimental.
I tried on my other x86_64 machine as well (newer Ryzen), and the same. Always reproducible when -mfpmath=both CFLAG is set, with GCC-13, and GCC-14 as well.
I see, good to know. Maybe to rare to be worth filtering in the ebuild, but if it comes up again maybe I will.
(for now)
Out of interest, Barnabas, do you know why you set -mfpmath=both? I see some people doing it but I'm never sure why / what started it.
