Public bug reported:
libsharp 1.0.0-2build1 fails to build from source on amd64v3:
https://launchpad.net/ubuntu/+source/libsharp/1.0.0-2build1/+build/31519162
Build log:
https://launchpad.net/ubuntu/+source/libsharp/1.0.0-2build1/+build/31519162/+files/buildlog_ubuntu-resolute-amd64v3.libsharp_1.0.0-2build1_BUILDING.txt.gz
libsharp/sharp_core.c:50:2: error: #error MULTIARCH specified but
platform-specific flags detected
Cause: on amd64, debian/rules adds -DMULTIARCH, which makes libsharp
build generic plus AVX/AVX2/FMA code paths and select one at runtime
(unrelated to Debian multiarch). The check is DEB_HOST_ARCH_CPU ==
amd64, which is also true for amd64v3 builds. There, the default
compiler flags include -march=x86-64-v3, which defines
__AVX__/__AVX2__/__FMA__ for all code, and libsharp refuses that
combination with an explicit #error (sharp_core.c:48-51). Runtime
selection is pointless on amd64v3 anyway, since the baseline already has
AVX2 and FMA.
The failed build is from resolute; stonking only has 1.0.0-2build1
copied from resolute's release pocket, so there is no amd64v3 build of
libsharp in stonking.
Fix: only add -DMULTIARCH when no -march= flag is set (patch attached in
a comment). Checked the resulting CFLAGS: with the normal amd64 flags
-DMULTIARCH is still added (amd64 unchanged); with -march=x86-64-v3
(added via dpkg-buildflags) it is not. A full package build has not been
done.
The change is harmless in Debian and could be forwarded there to avoid
carrying an Ubuntu delta.
** Affects: libsharp (Ubuntu)
Importance: Undecided
Status: New
** Tags: ftbfs
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https://bugs.launchpad.net/bugs/2169085
Title:
libsharp FTBFS on amd64v3: -DMULTIARCH combined with -march=x86-64-v3
hits #error
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