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Brad King 19f267c75e XL: Add support for Ninja and XL Fortran

The Ninja generator's support for Fortran requires that source files
be preprocessed explicitly first.  However, the `xlf` compiler does
not have a simple `-E` option or equivalent to do preprocessing.
The only documented way to get preprocessed output is to use `-d`
to leave it behind, but only at an inflexible location.

Instead, create our own `cpp` wrapper script and substitute it for the
real preprocessor using `-tF -B ...`.  Teach the wrapper to map the
`cpp` output to the location we need and then invoke the real `cpp`
underneath.

Fixes: #19450

2019-11-21 15:59:12 -05:00

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 xlf-ninja
 ---------
 * The IBM XL Fortran compiler is now supported by the :generator:`Ninja`
   generator.