Your message dated Fri, 22 May 2026 15:49:54 +0000
with message-id <[email protected]>
and subject line Bug#1135592: fixed in xsimd 14.2.0-2
has caused the Debian Bug report #1135592,
regarding xsimd: 14.2.0 breaks control of complex number support
to be marked as done.
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1135592: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1135592
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--- Begin Message ---
Source: xsimd
Version: 14.2.0-1
Severity: normal
Control: forwarded -1 https://github.com/xtensor-stack/xsimd/issues/1338
Previously xsimd set the CXX standard conditionally depending on
whether complex number support (from xtl) was provided or not.
xtl requires a more recent CXX standard than xsimd (currently
cxx_std_14 vs cxx_std_17)
In 14.2.0, upstream PR#1279
https://github.com/xtensor-stack/xsimd/issues/1338
hardcoded the lower CXX standard into its cmake config files
(/usr/share/cmake/xsimd/xsimdTargets.cmake)
while also recording complex number support
(set XSIMD_ENABLE_XTL_COMPLEX=1).
If an application (including xsimd's tests run standalone against the
installed package via debian/tests) is configured with
-DENABLE_XTL_COMPLEX=On then /usr/share/cmake/xsimd/xsimdConfig.cmake
finds xtl, which sets cxx_std_17.
But if the application does not explicitly set -DENABLE_XTL_COMPLEX=On
(i.e. does not want to use complex number support), xsimd gives
cxx_std_14, but also accesses xtl's complex numbers because
XSIMD_ENABLE_XTL_COMPLEX=1 is set without finding xtl (which would
activate cxx_std_17).
Failure then occurs due to the standards inconsistency via the
unwanted complex number support,
e.g. debian/tests/xsimd-test
[ 3%] Building CXX object CMakeFiles/test_xsimd.dir/test_api.cpp.o
/usr/bin/c++ -DXSIMD_ENABLE_XTL_COMPLEX=1 -Wunused-parameter -Wextra -Wreorder
-std=c++14 -g -fPIC -march=native -O3 -DNDEBUG -MD -MT
CMakeFiles/test_xsimd.dir/test_api.cpp.o -MF
CMakeFiles/test_xsimd.dir/test_api.cpp.o.d -o
CMakeFiles/test_xsimd.dir/test_api.cpp.o -c
/projects/mathlibs/build/xsimd/test/test_api.cpp
In file included from /usr/include/xtl/xcomplex.hpp:32,
from /usr/include/xsimd/arch/xsimd_scalar.hpp:26,
from /usr/include/xsimd/xsimd.hpp:18,
from /projects/mathlibs/build/xsimd/test/test_api.cpp:12:
/usr/include/xtl/xtype_traits.hpp:306:40: error: ‘conjunction’ is not a member
of ‘std’
306 | constexpr bool xtl_requires = std::conjunction<C...>::value;
| ^~~~~~~~~~~
/usr/include/xtl/xtype_traits.hpp:306:40: note: ‘std::conjunction’ is only
available from C++17 onwards
debian/tests/xsimd-test-complex, on the other hand, passes since its
-DENABLE_XTL_COMPLEX=On brings in xtl which activates cxx_std_17.
Issue raised upstream,
https://github.com/xtensor-stack/xsimd/issues/1338
As a workaround I might hard-code xsimd to just require the newer
cxx_std_17 standard that xtl requires.
--- End Message ---
--- Begin Message ---
Source: xsimd
Source-Version: 14.2.0-2
Done: Drew Parsons <[email protected]>
We believe that the bug you reported is fixed in the latest version of
xsimd, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Drew Parsons <[email protected]> (supplier of updated xsimd package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Fri, 22 May 2026 15:36:15 +0200
Source: xsimd
Architecture: source
Version: 14.2.0-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers
<[email protected]>
Changed-By: Drew Parsons <[email protected]>
Closes: 1135592
Changes:
xsimd (14.2.0-2) unstable; urgency=medium
.
* Team upload.
* improve configuration of xtl complex number support
- debian patch xtl_config_PR1351.patch applies upstream PR#1351 to
allow deactivation of XSIMD_ENABLE_XTL_COMPLEX, which has been
activated by default in the debian build
- consequently update support_xtl_standards.patch to drop hard
coding of C++ standard in test configuration
- debian/tests: control xtl complex number support via
XSIMD_ENABLE_XTL_COMPLEX not ENABLE_XTL_COMPLEX
(this might change back in xsimd 15)
- debian/tests: add xsimd-test[-clang]-float
with explicit -DXSIMD_ENABLE_XTL_COMPLEX=Off
- Closes: #1135592
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