fails on a Intel Ivy Brige target, OK on other systems (AMDK8, arm64, armv7, other Intel arches) [48/217] /usr/bin/x86_64-pc-linux-gnu-g++ -DGOOGLE_PROTOBUF_CMAKE_BUILD -DGOOGLE_PROTOBUF_NO_RTTI=1 -DHAVE_ZLIB -DLIBPROTOBUF_EXPORTS -DPROTOBUF_USE_DLLS -Dlibprotobuf_EXPORTS -I/var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23 .3_build-abi_x86_64.amd64 -I/var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src -I/var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/third_party/utf8_range -O2 -pipe -fomit-frame-pointer -march=ivybridge -mtune= ivybridge -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -MD -MT CMakeFiles/libprotobuf.dir/src/google/protobuf/json/internal/writer.cc.o -MF CMakeFiles/libprotobuf.dir/src/google/protobuf/json/internal/writer.cc.o.d -o CMakeFiles /libprotobuf.dir/src/google/protobuf/json/internal/writer.cc.o -c /var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src/google/protobuf/json/internal/writer.cc FAILED: CMakeFiles/libprotobuf.dir/src/google/protobuf/json/internal/writer.cc.o /usr/bin/x86_64-pc-linux-gnu-g++ -DGOOGLE_PROTOBUF_CMAKE_BUILD -DGOOGLE_PROTOBUF_NO_RTTI=1 -DHAVE_ZLIB -DLIBPROTOBUF_EXPORTS -DPROTOBUF_USE_DLLS -Dlibprotobuf_EXPORTS -I/var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3_build- abi_x86_64.amd64 -I/var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src -I/var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/third_party/utf8_range -O2 -pipe -fomit-frame-pointer -march=ivybridge -mtune=ivybridge -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -MD -MT CMakeFiles/libprotobuf.dir/src/google/protobuf/json/internal/writer.cc.o -MF CMakeFiles/libprotobuf.dir/src/google/protobuf/json/internal/writer.cc.o.d -o CMakeFiles/libproto buf.dir/src/google/protobuf/json/internal/writer.cc.o -c /var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src/google/protobuf/json/internal/writer.cc In file included from /usr/include/absl/numeric/bits.h:48, from /usr/include/absl/strings/cord_buffer.h:36, from /usr/include/absl/strings/cord.h:83, from /var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src/google/protobuf/io/zero_copy_stream.h:111, from /var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src/google/protobuf/io/zero_copy_sink.h:36, from /var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src/google/protobuf/json/internal/writer.h:48, from /var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src/google/protobuf/json/internal/writer.cc:31: In function ‘constexpr int absl::lts_20230802::numeric_internal::CountLeadingZeroes16(uint16_t)’, inlined from ‘constexpr int absl::lts_20230802::numeric_internal::CountLeadingZeroes(T) [with T = unsigned char]’ at /usr/include/absl/numeric/internal/bits.h:240:36, inlined from ‘constexpr typename std::enable_if<std::is_unsigned<_Tp>::value, int>::type absl::lts_20230802::countl_zero(T) [with T = unsigned char]’ at /usr/include/absl/numeric/bits.h:78:46, inlined from ‘constexpr typename std::enable_if<std::is_unsigned<_Tp>::value, int>::type absl::lts_20230802::countl_one(T) [with T = unsigned char]’ at /usr/include/absl/numeric/bits.h:86:21, inlined from ‘google::protobuf::json_internal::Utf8Scalar google::protobuf::json_internal::ConsumeUtf8Scalar(absl::lts_20230802::string_view&)’ at /var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src/google/protobuf/json /internal/writer.cc:168:27, inlined from ‘void google::protobuf::json_internal::JsonWriter::WriteEscapedUtf8(absl::lts_20230802::string_view)’ at /var/tmp/portage/dev-libs/protobuf-23.3-r4/work/protobuf-23.3/src/google/protobuf/json/internal/writer.cc:294:36: /usr/include/absl/numeric/internal/bits.h:173:38: error: ‘__builtin_clzs’ needs isa option -mlzcnt 173 | return x == 0 ? 16 : __builtin_clzs(x); | ~~~~~~~~~~~~~~^~~ Reproducible: Always # emerge --info '=dev-libs/protobuf-23.3-r4::gentoo' Portage 3.0.65 (python 3.12.4-final-0, default/linux/amd64/23.0/no-multilib, gcc-14, glibc-2.39-r9, 6.9.4 x86_64) ================================================================= System Settings ================================================================= System uname: Linux-6.9.4-x86_64-Intel-R-_Core-TM-_i5-3340M_CPU_@_2.70GHz-with-glibc2.39 KiB Mem: 16276124 total, 15182880 free KiB Swap: 16777056 total, 16777056 free Timestamp of repository gentoo: Fri, 14 Jun 2024 15:34:02 +0000 Timestamp of repository guru: Fri, 14 Jun 2024 12:36:12 +0000 sh bash 5.2_p26-r3 ld GNU ld (Gentoo 2.42 p3) 2.42.0 app-misc/pax-utils: 1.3.7::gentoo app-shells/bash: 5.2_p26-r3::gentoo dev-build/autoconf: 2.13-r8::gentoo, 2.72-r1::gentoo dev-build/automake: 1.16.5-r2::gentoo dev-build/cmake: 3.29.3::gentoo dev-build/libtool: 2.4.7-r4::gentoo dev-build/make: 4.4.1-r1::gentoo dev-build/meson: 1.4.1::gentoo dev-java/java-config: 2.3.3-r1::gentoo dev-lang/perl: 5.40.0::gentoo dev-lang/python: 3.11.9-r1::gentoo, 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Created attachment 895873 [details] build.log
seems related to abseil-cpp but I tried with older versions without any success
I wonder if this is actually caused by gcc-14: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112789 I have the same build problem and I am on the same gcc build too. But I'm not on an ivybridge processor, on a CPU type of: "KVM Processor v2.0" and the underlying processor as shown in /proc/cpuinfo is an AMD.
(In reply to Reuben Farrelly from comment #3) > I wonder if this is actually caused by gcc-14: > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112789 > > I have the same build problem and I am on the same gcc build too. But I'm > not on an ivybridge processor, on a CPU type of: "KVM Processor v2.0" and > the underlying processor as shown in /proc/cpuinfo is an AMD. I think the problem is really related to the processor feature requested by protobuf, but not enabled in Intel Ivy Bridge family if I dump -march=native and -mtune=native, I got -mno-lzcnt in the options. but even if I add -mno-lzcnt in CFLAGS and rebuild abseil-cpp, protobuf fails because it ask this function that will not work for me.
I filed a bug at protobuf's GitHub
Given we're quite far behind with versions in Gentoo (it's a mess and someone is working on it), I wouldn't assume it's not fixed already upstream. The code changed in https://github.com/protocolbuffers/protobuf/commit/7315f6d398d2d18443b26c513cbdcdbffaeebaa3 at least.
(In reply to Sam James from comment #6) > Given we're quite far behind with versions in Gentoo (it's a mess and > someone is working on it), I wouldn't assume it's not fixed already upstream. > > The code changed in > https://github.com/protocolbuffers/protobuf/commit/ > 7315f6d398d2d18443b26c513cbdcdbffaeebaa3 at least. Hi, Sam! I did not check that Gentoo in ~arch used a so outdated package... The patch you link is not sufficient, need more patches or a more recent protobuf release. I can build protobuf 21.12
Hi Xavier! Thank you for trying to do the right thing as well, not your fault at all, hopefully we can get abseil+protobuf sorted out on our side soon.
(In reply to Reuben Farrelly from comment #3) > I wonder if this is actually caused by gcc-14: FTR I have just tested this: gcc-13 (Gentoo Hardened 13.3.1_p20240614 p17) 13.3.1 20240614 - protobuf 23.3-r4 builds successfully gcc-14 (Gentoo Hardened 14.1.1_p20240615 p2) 14.1.1 20240615 - protobuf 23.3-r4 fails to build. It is a workaround at least for anyone who runs into the same problem and finds this bug report.
