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- a name clash since it tries to build both 32/64 bit versions

https://stackoverflow.com/questions/28398390/boost-build-breaks-name-clash-for-pstage-liblibboost-system-so-1-58-0

|       v2106       |       v2112       |   comment     |
|-------------------|-------------------|---------------|
| ADIOS2-2.6.0      | ADIOS2-2.7.1      | latest        |
| CGAL-4.12.2       | CGAL-4.14.3       | latest without c++14 requirement |
| ParaView-v5.9.1   | ParaView-v5.10.0  | final or RC2  |
| boost_1_66_0      | boost_1_74_0      | gcc-4.8.5 problems with 1_77_0 |
| fftw-3.3.7        | fftw-3.3.10       | bugfix        |
| openmpi-4.0.3     | openmpi-4.1.2     | latest        |
| scotch_6.1.0      | scotch_6.1.0      | dgraph regression in 6.1.2 |
| kahip-2.12        | kahip-3.14        | latest        |

- improve handling of different gcc/clang versions

- support -toolset=none to bypass all internal logic and let boost do
  everything.

- configure with the arch + package only for the prefix.
  When OPAL_PREFIX is unset, yields this type of information:

      Prefix: /linux64Gcc/openmpi-4.0.3
      Libdir: /linux64Gcc/openmpi-4.0.3/lib

  This ensures that the final binaries do not have the original build
  location, which makes for more reliable testing before shipping.

ENH: improve handling of header-only CGAL

- test for existence now also checks our cached build information
  for header-only configuration

- cleanup build artifacts from boost (in-source build).
  Skip install of generated man, info, doc pages.
  These are usually browsed/searched elsewhere anyhow.

- the various make scripts now also search hierarchical sources,
  which makes it easier to organize sources. The secondary
  sub-directory is the lower-case value of the package stripped of
  trailing non-alphabet characters.

  For example, searching for ParaView-v5.9.1

    sources/
    |-- adios
    |   |-- ...
    |   |-- ADIOS2-2.7.1
    |   \-- adios-1.13.1
    |-- cgal
    |   |-- CGAL-4.12.2
    |   \-- CGAL-4.14.2
    |   ...
    |-- openmpi
    |   |-- openmpi-4.0.3
    |   \-- openmpi-4.1.1
    |-- paraview
    |   |-- ParaView-v5.6.1
    |   \-- ParaView-v5.9.1
    \-- scotch
        ...

- additional out-of-source build options

  FOAM_THIRD_PARTY_BUILDROOT :
     Replace WM_THIRD_PARTY_DIR as the root for build/ and platforms/

  FOAM_THIRD_PARTY_SOURCES :
     Alternative to WM_THIRD_PARTY_DIR/sources/

- rationalise internal package variable names for easier maintenance

- Use WM_LABEL_SIZE to explicitly define INTSIZE32 or INTSIZE64, which
  ensures that SCOTCH_Num appears as (int32_t | int64_t) and avoids
  any ambiguity that a plain 'int' may have.

- Provide library symlinks to the respective label-size.
  Eg,  libscotch.so -> libscotch-int32.so

  This provides a unique library linkage name that avoids ambiguity
  with system-installed libraries.

- Use IDXSIZE64 (memory addressing width Fortran)

NOTE
  Unfortunately -DINT32 seems to fail if openmpi was built without Fortran!
  The MPI_INT32_T is interpreted as MPI_INTEGER4 which does not exist
  - needs more investigation

ENH: scotch - document Makefile.inc by copying into the source directory

ENH: update kahip build to use cmake for newer versions

- simplifies creation of 64bit indexed libraries, for reuse
  (with widening) by various OpenFOAM label sizes

- add -bin/-no-bin for metis (as per scotch)

- avoids flooding a head-node during compilation.

- also add LLVM_ARCH_PATH/bin into PATH (for finding llvm-config)

- use MPI_ARCH_PATH to provide an MPI hint when making ParaView, VTK
  and ADIOS.

  This should align the detected MPI with what OpenFOAM itself is
  using.  Option -mpi-home to override.

- does not change WM_OPTIONS or output directories, so that the target
  directories are correct.

- prevent unneeded recompilation

DOC: add link for new scotch package

- also permit petsc to determine its own hypre version (#58)

- adios is out of scope for cross-compilation

- metis does not seem to support cross-compilation.
  Use scotch instead.

- mistake introduced by 11e3723f

- check lib as well as lib64

- support -force option in a few more places

- reduces ThirdParty inter-dependency.
  Only useful for reading in graph files, which are not used
  internally by OpenFOAM.

- Was already removed for Mingw compilation.

- uses mpifcc/mpiFCC for mpicc/mpicxx, respectively

- only test in the packages that actually require it.
  State as a requirement.

ENH: skip build of packages with known mingw issues

- primarily kahip and pt-scotch.
  Others may also have issues, but for these we tend to use system
  packages anyhow.

ENH: add '-force' option to various scripts

- overrides some _lazy_ build logic

- add download hints for -help of various make scripts

- accept [0-9]* instead of attempting more restrictive specifications

CONFIG: makePETSC without fortran

- if not otherwise specified:
  - OpenFOAM-v1912 and older are implicitly `-with-lib`
  - new versions are implicitly `-no-lib`

- linkage errors for ptscotch not yet solved

CONFIG: add -I. for ThirdParty wmake Make/options

- some <headers> might otherwise be missed with the change to
  '-iquote' for general wmake rules

- improve library checks to avoid unnecessary rebuild when
  cross-compiling

- initialise some commonly used variables

- add library function for checking library existence that also
  accounts for windows cross-compilation targets

- may fail to find mpi.h with ThirdParty openmpi

- remove makeAdios1 (ADIOS1 considered defunct for our purposes)

- arguments passed to stripCompilerFlags caused the misbehaviour

- if passed things like "clang-9", strip down to the base name "clang"