I.e: the rules are:
* whenever calling gcc pass CFLAGS,
* whenever calling g++ pass CXXFLAGS.
* Whenever it links (i.e. without -c, -E or -S) pass LDFLAGS.
* Whenever it will preprocess anything, pass CPPFLAGS.
Note that CPPFLAGS and LDFLAGS are in the format as you need to
give them to gcc/g++, i.e. every ld option not understood by
gcc needs a -Wl, and so on...
Bernhard R. Link
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