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from 15edd7d6035 s390: Add cstoreti4 expander new 369c439ca19 libstdc++: Setup internal FTM for mdspan. new 4c9eef71db5 libstdc++: Add header mdspan to the build-system. new a33b5db97c4 libstdc++: Implement std::extents [PR107761]. new 0deefb93000 libstdc++: Add tests for std::extents. new 0a5855d14db libstdc++: Fix module std export for std::extents

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Summary of changes: libstdc++-v3/doc/doxygen/user.cfg.in | 1 + libstdc++-v3/include/Makefile.am | 1 + libstdc++-v3/include/Makefile.in | 1 + libstdc++-v3/include/bits/version.def | 9 + libstdc++-v3/include/bits/version.h | 9 + libstdc++-v3/include/precompiled/stdc++.h | 1 + libstdc++-v3/include/std/mdspan | 309 +++++++++++++++++++++ libstdc++-v3/src/c++23/std.cc.in | 9 +- .../mdspan/extents/class_mandates_neg.cc | 8 + .../23_containers/mdspan/extents/ctor_copy.cc | 82 ++++++ .../23_containers/mdspan/extents/ctor_ints.cc | 62 +++++ .../23_containers/mdspan/extents/ctor_shape.cc | 160 +++++++++++ .../23_containers/mdspan/extents/custom_integer.cc | 87 ++++++ .../testsuite/23_containers/mdspan/extents/misc.cc | 224 +++++++++++++++ 14 files changed, 962 insertions(+), 1 deletion(-) create mode 100644 libstdc++-v3/include/std/mdspan create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/extents/class_manda [...] create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_copy.cc create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_ints.cc create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/extents/ctor_shape.cc create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/extents/custom_integer.cc create mode 100644 libstdc++-v3/testsuite/23_containers/mdspan/extents/misc.cc