3.7. More Exercises
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## 3.7. More Exercises

### Exercise 3.1

You have got a set programs, each of which is created from its own assembly-language source file (suffix `.asm`). Each program can be assembled into two versions, one with error-checking code assembled in and one without. You could assemble them into files with different suffixes (`.eobj` and `.obj`, for instance), but your linker only understands files that end in `.obj`. To top it all off, the final executables must have the suffix `.exe`. How can you still use transformation rules to make your life easier (Hint: assume the errorchecking versions have ec tacked onto their prefix)?

### Exercise 3.2

Assume, for a moment or two, you want to perform a sort of “indirection” by placing the name of a variable into another one, then you want to get the value of the first by expanding the second somehow. Unfortunately, PMake does not allow constructs like:

$($(FOO))

What do you do? Hint: no further variable expansion is performed after modifiers are applied, thus if you cause a `$` to occur in the expansion, that is what will be in the result.

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