c++ - GCC Dependency Tracking: Is -M better than -MM? -


there 2 options tracking dependencies -m , -mm. difference -mm omits system headers , headers included them.

my question: why want use -m? inflates generated .d files drastically, since system header includes large pack of other system headers. in addition, system headers cannot built make, having them depencies yields no benefit. little benefit see - if required system header missing - make reports missing header instead of gcc reporting it. benefit of this?

to sum things up, see no reason why -m useful @ all. missing something? scenarios there require 1 use -m on -mm.

most header files can't "built" make. they're listed prerequisites if change, source code relies on them rebuilt. example, if install security fix packages on system , modify 1 of system headers use, may want sure code rebuilt. these days backward-compatibility of base libraries such not needed of time, agree.

also, if you're cross-compiling "system" header files provided cross-target; these headers might embedded system or similar, , may change (in non-backward-compatible ways) more standard system.


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