Hardened toolchains (eg, mainline Fedora) no longer tolerate null
derefs that were silently trapped/ignored in earlier versions. This
eliminates a nullptr deref in archive.hpp that was failing several
unit tests (and causing crashes) when trying to manipulate
default-constructed archive objects.
Add explicit defaults where missing for clarity.
Support passing in NETGEN_GIT_VERSION for use when building, eg, RPM
packages using rpkg, which requires building from an untagged source
bundle, that is, not directly from a git checkout.
Add option to choose build against internal or external Pybind11; add
cmake module to find and configure against system Pybind.
re-add versioning of shared library files.
Add section for GCC-specific options setting (right now, to turn off
harmless warnings).
Warn if pybind11_stubgen is not found.
Adjust stubgen paths to work when build is not in-place in the source tree.
Having version.hpp throw an exception when built against a malformed
version number (due to, eg, not having the git tag available in an
automated package build from source bundle) results in _init_ failing
during an otherwise apparently successful dlopen(), as well as the
netgen-mesher executable crashing before hitting main().
This patch both forces an abort and prints a helpful message alerting
the builder/user that something went wrong instead of handing over
either a coredump or a weirdly malfunctioning library with no apparent
cause. Hopefully this will avoid a repeat of automated Fedora builds
shipping nonfunctional Netgen RPMs for several years!
move fieldlines code to meshing dir
move visualization function pointers to meshing directory
DLL_HEADER -> NGGUI_API in visualization lib
move soldata.hpp to meshing
update occ, no freetype necessary anymore
Found via `codespell -q 3 -S ./external_dependencies/pybind11 -L alledges,allright,ane,anormal,ans,apoints,ba,boxs,cancle,childs,co-ordinate,co-ordinates,daty,enty,filld,hel,identifyable,ist,linz,lod,ned,nd,selt,statics,suround,thev,thist,thisy,timere,upto,wel`
vbslq_f64 and vandq_u64 both require uint64x2_t types as mask arguments,
and the Neon intrinsics do not allow for implicit conversion.
Fixes build errors with current GCC 11.2.1:
/home/abuild/rpmbuild/BUILD/netgen-6.2.2105/libsrc/core/simd_arm64.hpp:171:29: error: cannot convert '__Int64x2_t' to 'uint64x2_t'
171 | return vandq_u64 (a.Data(), b.Data());
