Created attachment 478026 [details] xz-compressed build.log I'm trying to build dev-qt/qtwebengine-5.9.0 from the qt overlay with debug informations on my Gentoo Linux system, but unfortunately it fails. The first error message is: ../../3rdparty/chromium/ui/base/l10n/l10n_util.cc:709:64: error: no match for 'operator<<' (operand types are 'std::basic_ostream<char>' and 'base::string16 {aka std::__cxx11::basic_string<char16_t>}') I'm building qtwebengine with the following environmental variables enabled: FEATURES="${FEATURES} nostrip" CFLAGS="${CFLAGS} -ggdb" CXXFLAGS="${CXXFLAGS} -ggdb" USE="${USE} debug" $ emerge -pv =dev-qt/qtwebengine-5.9.0 These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild R #] dev-qt/qtwebengine-5.9.0:5/5.9::qt USE="alsa debug* system-ffmpeg system-icu widgets -bindist -geolocation -pax_kernel -pulseaudio {-test}" 0 KiB Total: 1 package (1 reinstall), Size of downloads: 0 KiB Please also see my original upstream bug report: https://bugreports.qt.io/browse/QTBUG-61597
Created attachment 478028 [details] emerge --info
Hm, I can this not reproduce. Build here fine with gcc-7.1.0-r1 Hm, with which dev-libs/icu version build you?
I have dev-libs/icu-59.1
*** This bug has been marked as a duplicate of bug 618648 ***