scipopt/soplex: v8.1.0

Features:

• command line option --version to print version and compiler information

Performance:

• accelerate data classes ClassArray, SVectorBase, and SSVectorBase by caching vector entries and sizes
• accelerate comparator classes Compare, IdxCompare, BreakpointCompare, and ElementCompare by removing unused fields, avoiding argument copies, and reformulating difference computations
• accelerate sorting functions SPxShellsort, SPxQuicksort, and SPxQuicksortPart by removing redundant checks, skipping ordered entries, and reformulating to iteration
• detect sparsity inside CLUFactor<R>::solveLleft() to dynamically enter dense solving mode
• adapt the left sparsity factor to 0.01

Fixed bugs:

• enable functional assignment of SVectorBase from SSVectorBase
• assign nonzero size in scaleAssign() of SVectorBase
• correct SPxQuicksortPart return to end index after sorted range
• avoid index overflows in SPxQuicksort and SPxQuicksortPart

Interface & Parameters:

• added an overloaded version of SoPlexBase<R>::factorizeColumnRational() with an additional boolean parameter forceSolutionUpdate to compute solution values also when the basis is not optimal. (SOPLEX_APIVERSION 21)
• add SoPlexBase<R>::printExternalCodes() to print external libraries (SOPLEX_APIVERSION 22)

Build system:

• add link-time-optimization for release builds if supported by compiler, use -DLTO=on for cmake or LTO=true for make to enable
• add option to link FMT library of system instead of bundled headers, use -DSYSTEM_FMT=on for cmake or SYSTEM_FMT=true for make to enable
• in Makefile, changed default compiler (COMP) from gnu to clang when on macOS and added make/make.darwin.arm.clang{.opt,.dbg,}

Miscellaneous:

• disable deprecated iterators in fmt external to support modern MSVC
• remove broken template of DSVectorBase::add() from incompatible SVectorBase