Hi Jonathan, On Sun, 2 Mar 2025 at 23:28, Jonathan Wakely via Gcc-regression <gcc-regression@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" ? 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. >
