The distinction between CC and CPP and between [AC]FLAGS and CPPFLAGS
is very weakly enforced in kbuild. Most code uses CC and [AC]FLAGS,
even when preprocessing. The extra cflags are almost always
preprocessor flags, as are [AC]FLAGS_KERNEL.
I plan to remove CPP and CPPFLAGS, replacing $(CPP) with $(CC) -E
throughout and merging CPPFLAGS into [AC]FLAGS. This change will make
it much easier to handle implicit dependencies in kbuild 2.5.
Can anybody see a good reason to retain CPP and CPPFLAGS in kbuild?
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