dev-qt/qtwebengine (at least recent versions) actually uses bundled copy of protobuf from src/3rdparty/chromium/third_party/protobuf directory. So dependency on dev-libs/protobuf:= in ebuilds is probably incorrect. (www-client/chromium also uses bundled copy of protobuf.) dev-qt/qtwebengine 5.9.* and 5.10.* contain protobuf 3.0.0. dev-qt/qtwebengine 5.11.* contains protobuf 3.3.2.
Fails to build with dev-libs/protobuf-3.6.0.1 installed Genlop output for both packages: Mon Jan 29 21:01:24 2018 >>> dev-libs/protobuf-3.5.1.1 Fri Mar 9 18:14:03 2018 >>> dev-libs/protobuf-3.5.2 Tue Jun 26 13:18:01 2018 >>> dev-qt/qtwebengine-5.9.6 Thu Jun 28 10:38:50 2018 >>> dev-qt/qtwebengine-5.9.6-r1 Tue Jul 3 18:12:45 2018 >>> dev-qt/qtwebengine-5.11.1 Sat Jul 7 04:37:48 2018 >>> dev-libs/protobuf-3.6.0.1 [12264/15449] /usr/bin/x86_64-pc-linux-gnu-g++ -MMD -MF obj/content/public/network/network_sources/ignore_errors_cert_verifier.o.d -DV8_DEPRECATION_WARNINGS -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -DFIELDTRIAL_TESTING_ENABLED -DTOOLKIT_QT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DCONTENT_IMPLEMENTATION -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_32 -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_26 -DGL_GLEXT_PROTOTYPES -DUSE_GLX -DUSE_EGL -DUSING_SYSTEM_ICU=1 -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC -DGOOGLE_PROTOBUF_NO_RTTI -DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER -DHAVE_PTHREAD -DLEVELDB_PLATFORM_CHROMIUM=1 -DSK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS -DSK_HAS_PNG_LIBRARY -DSK_HAS_WEBP_LIBRARY -DSK_HAS_JPEG_LIBRARY -DSK_SUPPORT_GPU=1 -DUSING_SYSTEM_ICU=1 -DICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC -Igen -I../../3rdparty/chromium -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -Igen -Igen -Igen -Igen -Igen -Igen -Igen -Igen -I../../3rdparty/chromium/third_party/khronos -I../../3rdparty/chromium/gpu -I../../3rdparty/chromium/third_party/libyuv/include -Igen -Igen -Igen -Igen -Igen -I../../3rdparty/chromium/third_party/ced/src -I../../3rdparty/chromium/third_party/protobuf/src -I../../3rdparty/chromium/third_party/leveldatabase -I../../3rdparty/chromium/third_party/leveldatabase/src -I../../3rdparty/chromium/third_party/leveldatabase/src/include -I../../3rdparty/chromium/third_party/protobuf/src -Igen/protoc_out -I../../3rdparty/chromium/third_party/boringssl/src/include -I/usr/include/nss -I/usr/include/nspr -Igen -I../../3rdparty/chromium/skia/config -I../../3rdparty/chromium/skia/ext -I../../3rdparty/chromium/third_party/skia/include/c -I../../3rdparty/chromium/third_party/skia/include/config -I../../3rdparty/chromium/third_party/skia/include/core -I../../3rdparty/chromium/third_party/skia/include/effects -I../../3rdparty/chromium/third_party/skia/include/encode -I../../3rdparty/chromium/third_party/skia/include/gpu -I../../3rdparty/chromium/third_party/skia/include/images -I../../3rdparty/chromium/third_party/skia/include/lazy -I../../3rdparty/chromium/third_party/skia/include/pathops -I../../3rdparty/chromium/third_party/skia/include/pdf -I../../3rdparty/chromium/third_party/skia/include/pipe -I../../3rdparty/chromium/third_party/skia/include/ports -I../../3rdparty/chromium/third_party/skia/include/utils -I../../3rdparty/chromium/third_party/vulkan/include -I../../3rdparty/chromium/third_party/skia/src/gpu -I../../3rdparty/chromium/third_party/skia/src/sksl -I../../3rdparty/chromium/third_party/libwebm/source -I../../3rdparty/chromium/third_party/WebKit -Igen/third_party/WebKit -I../../3rdparty/chromium/v8/include -Igen/v8/include -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -funwind-tables -fPIC -pipe -pthread -m64 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wno-deprecated-declarations -fno-delete-null-pointer-checks -Wno-missing-field-initializers -Wno-unused-parameter -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g0 -fvisibility=hidden -std=gnu++14 -fno-delete-null-pointer-checks -Wno-narrowing -fno-exceptions -fno-rtti -fvisibility-inlines-hidden -c ../../3rdparty/chromium/content/public/network/ignore_errors_cert_verifier.cc -o obj/content/public/network/network_sources/ignore_errors_cert_verifier.o ../../3rdparty/chromium/base/time/time.h:58:10: fatal error: limits: No such file or directory
(In reply to Denis Descheneaux from comment #1) > Fails to build with dev-libs/protobuf-3.6.0.1 installed > [...] I can not reproduce this, builds here fine. [ebuild R ] dev-libs/protobuf-3.6.0.1:0/16::gentoo USE="zlib -emacs -examples -static-libs {-test}" ABI_X86="(64) -32 (-x32)" 0 KiB [ebuild R ] dev-qt/qtwebengine-5.11.1:5/5.11::gentoo USE="alsa pulseaudio system-ffmpeg system-icu widgets -bindist -debug -designer -geolocation -pax_kernel {-test}" 0 KiB
Followed the suggestion here by uninstalling it first and then emerging it clean, and it went it, looks like if you look at the ebuild that it uses headers etc outside the package build itself https://bugreports.qt.io/browse/QTBUG-58547
# bug 620444 - ensure local headers are used find "${S}" -type f -name "*.pr[fio]" | xargs sed -i -e 's|INCLUDEPATH += |&$$QTWEBENGINE_ROOT/include |' || die
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=788a887f418635c64ef058b12f541601363c3321 commit 788a887f418635c64ef058b12f541601363c3321 Author: Andreas Sturmlechner <asturm@gentoo.org> AuthorDate: 2018-07-07 08:39:50 +0000 Commit: Andreas Sturmlechner <asturm@gentoo.org> CommitDate: 2018-07-12 09:59:31 +0000 dev-qt/qtwebengine: Drop unused dependency (Unfortunately) it currently uses chromium's bundled protobuf. Thanks-to: Arfrever Frehtes Taifersar Arahesis <arfrever.fta@gmail.com> Bug: https://bugs.gentoo.org/660586 Package-Manager: Portage-2.3.41, Repoman-2.3.9 dev-qt/qtwebengine/qtwebengine-5.11.1.ebuild | 1 - dev-qt/qtwebengine/qtwebengine-5.9.6-r1.ebuild | 1 - 2 files changed, 2 deletions(-)
https://gitweb.gentoo.org/proj/qt.git/commit/?id=e389555ec66d89f4d0fed7a9d75a3deeada7fce7 commit e389555ec66d89f4d0fed7a9d75a3deeada7fce7 Author: Jimi Huotari <chiitoo@gentoo.org> AuthorDate: Thu Jul 25 23:11:33 2018 +0000 Commit: Jimi Huotari <chiitoo@gentoo.org> CommitDate: Thu Jul 25 23:15:28 2018 +0000 dev-qt/qtwebengine: sync with main Gentoo repo tree Package-Manager: Portage-2.3.43, Repoman-2.3.10
