maintainer-feedback requested: [Bug 240899] math/suitesparse: clean up and improve

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-fortran mailing
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Bug 240899: math/suitesparse: clean up and improve
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240899



--- Description ---
ArchLinux has very simple build, so let's use it as the basis. Better than
accumulating regressions each update.
https://git.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD?h=packages/
suitesparse

Changes:
- Allow using Clang again (base libomp.so or OpenMP disabled)
- Respect C++ library if using GCC (must be libc++ on Clang architectures)[1]
- Respect CFLAGS/CXXFLAGS in subdirectories using CMake
- Respect BLAS/LAPACK choice (actually use OpenBLAS)[1]
- Enable Intel threading building blocks support
- Switch to vendor build/install targets
- Adjust plist for new items (GraphBLAS, Mongoose, DOCS)
- Skip running demos during build

[1] important enough to merge into /quarterly

Builds fine on:
- 11.2 aarch64/amd64/armv6/i386
- 11.3 aarch64/amd64/armv6/i386
- 12.0 aarch64/amd64/armv6/armv7/i386
- 13.0 aarch64/amd64/i386
- DOCS=off OPENMP=off TBB=off on 11.2 i386
- All consumers on 11.2/13.0 amd64 (with/without libomp)
- databases/grass7 on 12.0/13.0 amd64 (with/without libomp)