Build-Time Substitutions can't be escaped

[fran6co]

%1, %2, %3 and %4 can't be escaped, if I want to pass %1 as part of a define Fastbuild will replace it with a path.

[ffulin]

Sadly, you're right - there is currently no way to escape these options. The normal escape character ^ is purely a bff parse-time mechanism, so during build time, we've lost any escaping that might have been done. It should be possible to fix this, but it will need some thought to think about a clean way to do so.

[fran6co]

It could be related to => #59 Probably a fix for that one would help here too (some way to escape after the parser so you could escape spaces and %).

[ffulin]

I think that #59 is a different issue - i.e. that's a problem with the parser not correctly handling certain cases during bff parsing, while this issue is more about escape information being persisted somehow to built time and respected at build time.

[fran6co]

Adding a way to persist escape information could help to escape white spaces and fix the other issue, but yes they are different issues.