Frank Benkstein 57701227d6 configure_file: canonicalize input and output path in dependencies ...

Represent the input file path internally in canonical form.  Otherwise
multiple `configure_file` calls that share the same input file but specify
it relative to different directories (e.g. via `../`) result in multiple
copies of the dependency on the rule to re-run CMake.  This causes the
Ninja generator to emit duplicate phony build statements for these
dependencies, which generates an error with `-w dupbuild=err`, which
will be default in Ninja 1.9.

Also canonicalize the output path for consistency.

Add a test case.

Fixes: #18584

2018-11-19 10:11:12 -05:00

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