docs: use modern cmake/ninja version setting in Fortran example

[henryiii]

Fixing the example.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.90%. Comparing base (9d49270) to head (c9ced82).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #809   +/-   ##
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  Coverage   82.90%   82.90%           
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  Files          69       69           
  Lines        3926     3926           
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  Hits         3255     3255           
  Misses        671      671           

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[flex0902]

The latest pysoild 0.3.3 using this example for compiling fortran program "solid.for".
when I use "pip install pysolid", the error message in cmake is below:

The problem seeems to be "\" in the path.
How do I solve this issue.
Many thanks

[henryiii]

We haven’t run this example on Windows (requires a Fortran compiler), so it looks like it’s missing a conversion to CMake path.

file(TO_CMAKE_PATH "${F2PY_INCLUDE_DIR}" F2PY_INCLUDE_DIR)

# or for CMake 3.20+ only
cmake_path(CONVERT ${F2PY_INCLUDE_DIR} TO_CMAKE_PATH_LIST F2PY_INCLUDE_DIR)