[bug #64185] *** only one 'else' per conditional. Stop. due to else in recipe

[Paul D. Smith]

Update of bug #64185 (project make):

              Item Group:                     Bug => Enhancement            

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Follow-up Comment #3:

I agree that due to parsing limitations it's very difficult to manage this as
make's keywords are too common and its structure is not regular enough.

We could modify the parser so that "else" lines which start with the recipe
prefix are ignored, so "else" that appears inside a recipe wouldn't be in
effect.  The problem with this is that the recipe prefix could be changed and
since we're not actually parsing the code we would not notice:


if FOO
all:
        else
.RECIPEPREFIX = >
        else
X = y
endif


How do we understand that once the .RECIPEPREFIX is modified, the "else" that
starts with a TAB should not be assumed to be a recipe prefix anymore?

I guess we can just say that it's never OK to indent make processor statements
with a TAB.  If we assume that any "else" (for example) indented with a TAB is
never a make "else" then we shouldn't have this problem.

I think.  I'm not sure how much havoc this would cause for backward
compatibility.


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