[bug #59956] Recipes inside conditionals can break the parser

[Paul D. Smith]

Follow-up Comment #4, bug #59956 (project make):

Any target can have a recipe, even special targets like *.PHONY:*, *.POSIX:*,
*.ONESHELL:*, etc.  Those recipes are ignored but they are syntactically
legal.  I guess there would be value in mentioning them if some sort of
"warning mode" were enabled.

Re *.RECIPEPREFIX*: I see; yes I should have tried it myself then I would have
realized what you meant.  Right, this bug is a weird confluence of the
Original Sin of makefiles (using TAB, which is just whitespace, as a recipe
prefix) and the choice in GNU make to use simple *else* as the keyword; other
make implementations use special keywords like *.else* or similar which are
less likely to conflict with "real rules".

If the recipe prefix is anything other than whitespace this bug cannot happen.

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