Ok, I made a script to grep all the #define and #undef symbols in config.h and Geany appears to be fairly careful using ifdef ifndef or defined(),

Good :)

Scintilla has at least one place where it compares a symbol to 0, but I think its its own internal one so fine.

Fine as well.

But ctags!!!! if HAVE_FOO && HAVE_BAR && HAVE_BLETCH all over the place. This relies on the identifiers having been defined 1 or it would become if && && after the defined but empty identifiers were substituted. Sigh!!!

Feel like making a PR upstream? :)

So I guess we have no choice but to continue defining 1 until C23 when true will be accepted :-)

Well meson would just emit an empty #define FOO if you use cfg_data.set('FOO', true) -- e.g. when using a boolean, it emits either an empty #define or a #undef. So kinda irrelevant :)

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