8000 [BUG]: EpollBackend.h: error: type struct EpollBackend violates the C++ One Definition Rule [-Werror=odr] · Issue #2387 · facebook/folly · GitHub
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[BUG]: EpollBackend.h: error: type struct EpollBackend violates the C++ One Definition Rule [-Werror=odr] #2387

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Kangie opened this issue Feb 20, 2025 · 3 comments
Open

[BUG]: EpollBackend.h: error: type struct EpollBackend violates the C++ One Definition Rule [-Werror=odr] #2387

Kangie opened this issue Feb 20, 2025 · 3 comments

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@Kangie
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Kangie commented Feb 20, 2025

Building with diagnostic flags enabled I encountered the following:

: && /usr/bin/x86_64-pc-linux-gnu-g++ -fPIC -march=native -O2 -pipe -flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing -fdiagnostics-color=always -frecord-gcc-switches  -Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs   -Wl,--dependency-file=CMakeFiles/folly.dir/link.d -shared -Wl,-soname,libfolly.so.0.58.0-dev -o libfolly.so.0.58.0-dev CMakeFiles/folly_base.dir/folly/CancellationToken.cpp.o CMakeFiles/folly_base.dir/folly/ClockGettimeWrappers.cpp.o CMakeFiles/folly_base.dir/folly/Conv.cpp.o CMakeFiles/folly_base.dir/folly/Demangle.cpp.o CMakeFiles/folly_base.dir/folly/ExceptionString.cpp.o CMakeFiles/folly_base.dir/folly/ExceptionWrapper.cpp.o CMakeFiles/folly_base.dir/folly/Executor.cpp.o CMakeFiles/folly_base.dir/folly/File.cpp.o CMakeFiles/folly_base.dir/folly/FileUtil.cpp.o CMakeFiles/folly_base.dir/folly/Fingerprint.cpp.o CMakeFiles/folly_base.dir/folly/FmtUtility.cpp.o CMakeFiles/folly_base.dir/folly/FollyMemcpy.cpp.o 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/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.h:34: error: type ‘struct EpollBackend’ violates the C++ One Definition Rule [-Werror=odr]
   34 | class EpollBackend : public EventBaseBackendBase {
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.h:34: note: a different type is defined in another translation unit
   34 | class EpollBackend : public EventBaseBackendBase {
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.h:104: note: the first difference of corresponding definitions is field ‘events_’
  104 |   std::vector<struct epoll_event> events_; // Cache allocation.
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.h:104: note: a field of same name but different type is defined in another translation unit
  104 |   std::vector<struct epoll_event> events_; // Cache allocation.
/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/bits/stl_vector.h:428: note: type name ‘std::vector<epoll_event, std::allocator<epoll_event> >’ should match type name ‘std::vector<folly::epoll_event, std::allocator<folly::epoll_event> >’
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.h:45: error: type of ‘__ct_comp ’ does not match original declaration [-Werror=lto-type-mismatch]
   45 |   explicit EpollBackend(Options options);
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.cpp:176: note: ‘__ct_comp ’ was previously declared here
  176 | EpollBackend::EpollBackend(Options options) : options_(options) {
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.cpp:176: note: code may be misoptimized unless ‘-fno-strict-aliasing’ is used
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.h:50: error: type of ‘getPollableFd’ does not match original declaration [-Werror=lto-type-mismatch]
   50 |   int getPollableFd() const override { return epollFd_; }
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.h:50: note: ‘getPollableFd’ was previously declared here
   50 |   int getPollableFd() const override { return epollFd_; }
/var/tmp/portage/dev-cpp/folly-2025.02.17.00/work/folly-2025.02.17.00/folly/io/async/EpollBackend.h:50: note: code may be misoptimized unless ‘-fno-strict-aliasing’ is used
lto1: some warnings being treated as errors
lto-wrapper: fatal error: /usr/bin/x86_64-pc-linux-gnu-g++ returned 1 exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/14/../../../../x86_64-pc-linux-gnu/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status

First reported for Gentoo on 2024.11.04.00, reproduced on 2025.02.17.00

Build Log

See also: https://bugs.gentoo.org/949607
@sin-ack
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sin-ack commented Apr 21, 2025
8000

Can no longer reproduce with gcc 15.0.1_pre20250418 on Folly 2025.04.14.00.

@Kangie
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Kangie commented May 13, 2025

It's still an issue; you need to build with appropriate flags for LTO and warnings -flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing: folly-2025.02.17.00:20250220-033225.log

@sin-ack
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sin-ack commented May 14, 2025

Yeah, sorry. Seems like -flto is not in the default set of Gentoo options, so I missed this (should've looked more closely). I'll take another look.

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