On Mon, 3 Mar 2025 at 09:10, Christophe Lyon <christophe.l...@linaro.org> wrote:
>
> Hi Jonathan,
>
> On Sun, 2 Mar 2025 at 23:28, Jonathan Wakely via Gcc-regression
> <gcc-regress...@gcc.gnu.org> wrote:
> >
> > On Sun, 2 Mar 2025 at 02:42, <ci_not...@linaro.org> wrote:
> > >
> > > Dear contributor,
> > >
> > > Our automatic CI has detected problems related to your patch(es). Please
> > > find some details below.
> > >
> > > In arm-eabi cortex-m7 hard, after:
> > > | commit gcc-15-7765-g3866ca796d5
> > > | Author: Jonathan Wakely <jwak...@redhat.com>
> > > | Date: Thu Feb 27 13:27:17 2025 +0000
> > > |
> > > | libstdc++: Fix ranges::move and ranges::move_backward to use
> > > iter_move [PR105609]
> > > |
> > > | The ranges::move and ranges::move_backward algorithms are
> > > supposed to
> > > | use ranges::iter_move(iter) instead of std::move(*iter), which
> > > matters
> > > | for an iterator type with an iter_move overload findable by ADL.
> > > | ... 16 lines of the commit log omitted.
> > >
> > > Produces 8 regressions:
> > > |
> > > | regressions.sum:
> > > | Running libstdc++:libstdc++-dg/conformance.exp ...
> > > | FAIL: 25_algorithms/move/constrained.cc -std=gnu++20 (test for excess
> > > errors)
> > > | UNRESOLVED: 25_algorithms/move/constrained.cc -std=gnu++20
> > > compilation failed to produce executable
> > > | FAIL: 25_algorithms/move/constrained.cc -std=gnu++26 (test for excess
> > > errors)
> > > | UNRESOLVED: 25_algorithms/move/constrained.cc -std=gnu++26
> > > compilation failed to produce executable
> > > | ... and 4 more
> >
> > It looks like thumb has some unusual linking requirements that I'm not
> > familiar with, so undefined functions (which are never actually called
> > in the test) cause linker errors:
> >
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/bits/iterator_concepts.h:155:(.text._Z6test06N8pr1056091IE+0x6):
> > undefined reference to `pr105609::iter_move(pr105609::I const&)'
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/destdir/x86_64-pc-linux-gnu/arm-eabi/bin/ld:
> > (_ZN8pr1056099iter_moveERKNS_1IE): Unknown destination type
> > (ARM/Thumb) in /tmp/ccqKQGzN.o
>
> This is a "recent" linker warning, which I added sometime during last
> year (so you need recent binutils if you want to try to reproduce the
> problem).
> It means that for some reason the destination symbol lacks a tag (asm
> directive) saying whether it's a thumb or an arm function. This is
> used by the linker when deciding which type of stub to insert (if
> any).
> For instance: ".type myfunc, %function"
> but normally the compiler adds this for you.
>
> But you mention "undefined functions", so that would probably be the
> reason, but how can the link succeed? Are you linking with "-z undefs"
> ?
See e.g. libstdc++-v3/testsuite/25_algorithms/move/constrained.cc
The test06 function uses undefined member functions such as
I::operator== but because test06 is never called, it shouldn't matter.
I can move test06 to a separate { dg-do compile } test, where the
linker isn't involved at all.
>
> Thanks,
>
> Christophe
>
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/bits/iterator_concepts.h:155:(.text._Z6test06N8pr1056091IE+0x6):
> > dangerous relocation: unsupported relocation
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/bits/ranges_algobase.h:326:(.text._Z6test06N8pr1056091IE+0xc):
> > undefined reference to `pr105609::I::operator++()'
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/destdir/x86_64-pc-linux-gnu/arm-eabi/bin/ld:
> > (_ZN8pr1056091IppEv): Unknown destination type (ARM/Thumb) in
> > /tmp/ccqKQGzN.o
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/bits/ranges_algobase.h:326:(.text._Z6test06N8pr1056091IE+0xc):
> > dangerous relocation: unsupported relocation
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/destdir/x86_64-pc-linux-gnu/arm-eabi/bin/ld:
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/bits/ranges_algobase.h:323:(.text._Z6test06N8pr1056091IE+0x16):
> > undefined reference to `pr105609::I::operator==(pr105609::I) const'
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/destdir/x86_64-pc-linux-gnu/arm-eabi/bin/ld:
> > (_ZNK8pr1056091IeqES0_): Unknown destination type (ARM/Thumb) in
> > /tmp/ccqKQGzN.o
> > /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/builds/x86_64-pc-linux-gnu/arm-eabi/gcc-gcc.git~master-stage2/arm-eabi/libstdc++-v3/include/bits/ranges_algobase.h:323:(.text._Z6test06N8pr1056091IE+0x16):
> > dangerous relocation: unsupported relocation
> >
> > I think I should be able to workaround this.
> >
>
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