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Bug#974710: marked as done (mipsel: undefined reference to `__divsi3' (fenicsx-performance-tests FTBFS))

Your message dated Mon, 25 Oct 2021 20:59:41 +0200
with message-id <20369713198a354f8e340538369c65b6@debian.org>
and subject line Re: Bug#974710 mipsel: undefined reference to `__divsi3' (fenicsx-performance-tests FTBFS)
has caused the Debian Bug report #974710,
regarding mipsel: undefined reference to `__divsi3' (fenicsx-performance-tests FTBFS)
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
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-- 
974710: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=974710
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: gcc-10
Version: 10.2.0-17
Severity: important

On mipsel, fenicsx-performance-tests 0.0~git20201022.8913e0f-1 has
started failing to build.

The main error is "undefined reference to __divsi3'",
as well as __umodsi3

Excerpt from the build log is:

[ 71%] Building CXX object CMakeFiles/dolfinx-scaling-test.dir/mesh.cpp.o
/usr/bin/c++ -DBOOST_ALL_NO_LIB -DBOOST_CHRONO_DYN_LINK -DBOOST_PROGRAM_OPTIONS_DYN_LINK -DBOOST_TIMER_DYN_LINK -DDOLFINX_VERSION=\"2019.2.9.99\" -DEIGEN_MAX_ALIGN_BYTES=32 -DHAS_SLEPC -I"/<<PKGBUILDDIR>>/obj-mipsel-linux-gnu" -I"/<<PKGBUILDDIR>>/src" -isystem /usr/lib/python3/dist-packages/ffcx/codegeneration -isystem /usr/include/eigen3 -isystem /usr/include/hdf5/openmpi -isystem /usr/lib/mipsel-linux-gnu/openmpi/include/openmpi -isystem /usr/lib/mipsel-linux-gnu/openmpi/include -isystem /usr/lib/petscdir/petsc3.14/mipsel-linux-gnu-real/include -isystem /usr/lib/slepcdir/slepc3.14/mipsel-linux-gnu-real/include -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -pthread -std=c++17 -march=native -Wall -Wextra -pedantic -Werror -Ofast -o CMakeFiles/dolfinx-scaling-test.dir/main.cpp.o -c "/<<PKGBUILDDIR>>/src/main.cpp"
/usr/bin/c++ -DBOOST_ALL_NO_LIB -DBOOST_CHRONO_DYN_LINK -DBOOST_PROGRAM_OPTIONS_DYN_LINK -DBOOST_TIMER_DYN_LINK -DDOLFINX_VERSION=\"2019.2.9.99\" -DEIGEN_MAX_ALIGN_BYTES=32 -DHAS_SLEPC -I"/<<PKGBUILDDIR>>/obj-mipsel-linux-gnu" -I"/<<PKGBUILDDIR>>/src" -isystem /usr/lib/python3/dist-packages/ffcx/codegeneration -isystem /usr/include/eigen3 -isystem /usr/include/hdf5/openmpi -isystem /usr/lib/mipsel-linux-gnu/openmpi/include/openmpi -isystem /usr/lib/mipsel-linux-gnu/openmpi/include -isystem /usr/lib/petscdir/petsc3.14/mipsel-linux-gnu-real/include -isystem /usr/lib/slepcdir/slepc3.14/mipsel-linux-gnu-real/include -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -pthread -std=c++17 -o CMakeFiles/dolfinx-scaling-test.dir/mesh.cpp.o -c "/<<PKGBUILDDIR>>/src/mesh.cpp"
/usr/bin/cc -DBOOST_ALL_NO_LIB -DBOOST_CHRONO_DYN_LINK -DBOOST_PROGRAM_OPTIONS_DYN_LINK -DBOOST_TIMER_DYN_LINK -DDOLFINX_VERSION=\"2019.2.9.99\" -DEIGEN_MAX_ALIGN_BYTES=32 -DHAS_SLEPC -I"/<<PKGBUILDDIR>>/obj-mipsel-linux-gnu" -I"/<<PKGBUILDDIR>>/src" -isystem /usr/lib/python3/dist-packages/ffcx/codegeneration -isystem /usr/include/eigen3 -isystem /usr/include/hdf5/openmpi -isystem /usr/lib/mipsel-linux-gnu/openmpi/include/openmpi -isystem /usr/lib/mipsel-linux-gnu/openmpi/include -isystem /usr/lib/petscdir/petsc3.14/mipsel-linux-gnu-real/include -isystem /usr/lib/slepcdir/slepc3.14/mipsel-linux-gnu-real/include -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -pthread -march=native -Ofast -o CMakeFiles/dolfinx-scaling-test.dir/Elasticity.c.o -c "/<<PKGBUILDDIR>>/obj-mipsel-linux-gnu/Elasticity.c"
[ 85%] Building C object CMakeFiles/dolfinx-scaling-test.dir/Poisson.c.o
/usr/bin/cc -DBOOST_ALL_NO_LIB -DBOOST_CHRONO_DYN_LINK -DBOOST_PROGRAM_OPTIONS_DYN_LINK -DBOOST_TIMER_DYN_LINK -DDOLFINX_VERSION=\"2019.2.9.99\" -DEIGEN_MAX_ALIGN_BYTES=32 -DHAS_SLEPC -I"/<<PKGBUILDDIR>>/obj-mipsel-linux-gnu" -I"/<<PKGBUILDDIR>>/src" -isystem /usr/lib/python3/dist-packages/ffcx/codegeneration -isystem /usr/include/eigen3 -isystem /usr/include/hdf5/openmpi -isystem /usr/lib/mipsel-linux-gnu/openmpi/include/openmpi -isystem /usr/lib/mipsel-linux-gnu/openmpi/include -isystem /usr/lib/petscdir/petsc3.14/mipsel-linux-gnu-real/include -isystem /usr/lib/slepcdir/slepc3.14/mipsel-linux-gnu-real/include -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -pthread -march=native -Ofast -o CMakeFiles/dolfinx-scaling-test.dir/Poisson.c.o -c "/<<PKGBUILDDIR>>/obj-mipsel-linux-gnu/Poisson.c"
[100%] Linking CXX executable dolfinx-scaling-test
/usr/bin/c++ -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -Wl,-z,relro -pthread CMakeFiles/dolfinx-scaling-test.dir/main.cpp.o CMakeFiles/dolfinx-scaling-test.dir/mesh.cpp.o CMakeFiles/dolfinx-scaling-test.dir/Elasticity.c.o CMakeFiles/dolfinx-scaling-test.dir/Poisson.c.o -o dolfinx-scaling-test  -Wl,-rpath,/usr/lib/mipsel-linux-gnu/openmpi/lib:/usr/lib/mipsel-linux-gnu/hdf5/openmpi:/usr/lib/slepcdir/slepc3.14/mipsel-linux-gnu-real/lib:/usr/lib/petscdir/petsc3.14/mipsel-linux-gnu-real/lib: /usr/lib/mipsel-linux-gnu/libdolfinx_real.so.2019.2.9.99 /usr/lib/mipsel-linux-gnu/libboost_program_options.so.1.71.0 /usr/lib/mipsel-linux-gnu/libboost_timer.so.1.71.0 /usr/lib/mipsel-linux-gnu/libboost_chrono.so.1.71.0 /usr/lib/mipsel-linux-gnu/openmpi/lib/libmpi_cxx.so /usr/lib/mipsel-linux-gnu/openmpi/lib/libmpi.so /usr/lib/mipsel-linux-gnu/hdf5/openmpi/libhdf5.so /usr/lib/mipsel-linux-gnu/libsz.so /usr/lib/mipsel-linux-gnu/libz.so /usr/lib/mipsel-linux-gnu/libdl.so /usr/lib/mipsel-linux-gnu/libm.so /usr/lib/slepcdir/slepc3.14/mipsel-linux-gnu-real/lib/libslepc_real.so /usr/lib/petscdir/petsc3.14/mipsel-linux-gnu-real/lib/libpetsc_real.so
/usr/bin/ld: CMakeFiles/dolfinx-scaling-test.dir/main.cpp.o: in function `void Eigen::internal::check_rows_cols_for_overflow<-1>::run<int>(int, int)':
/usr/include/eigen3/Eigen/src/Core/PlainObjectBase.h:46: undefined reference to `__divsi3'
/usr/bin/ld: /usr/include/eigen3/Eigen/src/Core/PlainObjectBase.h:46: undefined reference to `__divsi3'
/usr/bin/ld: /usr/include/eigen3/Eigen/src/Core/PlainObjectBase.h:46: undefined reference to `__divsi3'
/usr/bin/ld: /usr/include/eigen3/Eigen/src/Core/PlainObjectBase.h:46: undefined reference to `__divsi3'
/usr/bin/ld: /usr/include/eigen3/Eigen/src/Core/PlainObjectBase.h:46: undefined reference to `__divsi3'
/usr/bin/ld: CMakeFiles/dolfinx-scaling-test.dir/main.cpp.o:/usr/include/eigen3/Eigen/src/Core/PlainObjectBase.h:46: more undefined references to `__divsi3' follow
/usr/bin/ld: CMakeFiles/dolfinx-scaling-test.dir/main.cpp.o: in function `unsigned int std::__detail::__to_chars_len<unsigned int>(unsigned int, int)':
/usr/include/c++/10/bits/charconv.h:61: undefined reference to `__udivsi3'
/usr/bin/ld: /usr/include/c++/10/bits/charconv.h:62: undefined reference to `__udivsi3'
/usr/bin/ld: CMakeFiles/dolfinx-scaling-test.dir/main.cpp.o: in function `void std::__detail::__to_chars_10_impl<unsigned int>(char*, unsigned int, unsigned int)':
/usr/include/c++/10/bits/charconv.h:86: undefined reference to `__umodsi3'
/usr/bin/ld: /usr/include/c++/10/bits/charconv.h:86: undefined reference to `__umodsi3'
/usr/bin/ld: /usr/include/c++/10/bits/charconv.h:87: undefined reference to `__udivsi3'
/usr/bin/ld: /usr/include/c++/10/bits/charconv.h:87: undefined reference to `__udivsi3'
/usr/bin/ld: CMakeFiles/dolfinx-scaling-test.dir/main.cpp.o: in function `void Eigen::internal::check_rows_cols_for_overflow<-1>::run<int>(int, int)':
/usr/include/eigen3/Eigen/src/Core/PlainObjectBase.h:46: undefined reference to `__divsi3'
/usr/bin/ld: /usr/include/eigen3/Eigen/src/Core/PlainObjectBase.h:46: undefined reference to `__divsi3'
collect2: error: ld returned 1 exit status

Full log at
https://buildd.debian.org/status/logs.php?pkg=fenicsx-performance-tests&arch=mipsel
https://buildd.debian.org/status/fetch.php?pkg=fenicsx-performance-tests&arch=mipsel&ver=0.0%7Egit20201022.8913e0f-1&stamp=1605323049&raw=0


The error message doesn't really make sense in the context of
fenicsx-performance-tests itself, or in eigen3 where the error is
triggered (noting also it is triggered in
/usr/include/c++/10/bits/charconv.h)

Discussing at #debian-devel on IRC, Jessica Clarke suggests the use of
-march=native may be involved. gcc docs say this flag is supposed to
be supported on mipsel.  Is there a bug here selecting the appropriate
processor?

Jessica's diagnosis from IRC:
<jrtc27> uh yeah that shouldn't be happening, mipsel can do division in hardware so doesn't have the si libfuncs (only the di ones for 64-bit integers)
...
<jrtc27> my guess would be that something about the loongson3a-specific division instructions breaks
...
<jrtc27> it'd be interesting to see what gcc things -march=native is on that buildd
<jrtc27> there's some hairy logic that disables the traditional mips mul/div on loongson architectures
<jrtc27> with the intent that the loongson-specific patterns then match
...
<jrtc27> -march=gs464 -mno-loongson-ext
<jrtc27> tor -march=loongson3a -mno-loongson-ext
<jrtc27> *or
<jrtc27> that gets gcc to emit libcalls, not hard float instructions
<Rizzer> could it be a bug in the latest gcc10? march=native picking the wrong processor?
<jrtc27> there's at least one bug in gcc
<Rizzer> nothing mips-specific in the changelog for recent uploads though
<jrtc27> I don't know what exactly -march=native decides; maybe -mno-loongson-ext is intended, maybe not
<jrtc27> but regardless, loongson3a without loongson-ext *should* fall back on the traditional mips instructions
<jrtc27> ISA_AVOID_DIV_HILO however doesn't account for TARGET_LOONGSON_EXT being false
<jrtc27> when TARGET_GS464 is true
<jrtc27> as the loongson division instructions are gated on TARGET_LOONGSON_2EF || TARGET_LOONGSON_EXT
<Rizzer> How certain is it a bug in gcc-10?  Is it certain enough for me to file a bug report against gcc-10 ?
<jrtc27> 99%
<jrtc27> well, 100% really
<jrtc27> if it means to use the libcalls in that weird case, it needs to include the functions in libgcc
<jrtc27> but I'm 99.99999% sure it doesn't want to use soft ... division


Jessica prepared a minimal test case to reproduce the problem at http://paste.debian.net/1172394/
(sid_mipsel-dchroot)$ echo 'int div(int x, int y) { return x / y; } int mod(int x, int y) { return x % y; }' | cc -x c - -o - -S -march=loongson3a -mno-loongson-ext | grep si3
	.globl	__divsi3
	lw	$2,%call16(__divsi3)($28)
	.reloc	1f,R_MIPS_JALR,__divsi3
	.globl	__modsi3
	lw	$2,%call16(__modsi3)($28)
	.reloc	1f,R_MIPS_JALR,__modsi3

--- End Message ---
--- Begin Message --- Not sure when the problem cleared, but we have gcc 11 now and fenicsx-performance-tests is now building and running fine. 

Drew

--- End Message ---
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