In Makefiles GCC C programs, What are .d files and also what is a wildcard.? -

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in makefiles gcc c programs, .d files , wildcard.?

rgds,

these *.d files (and conventionally) make dependencies (but perhaps, , unlikely, d-language source code).

the gcc compiler knows -m (and related) preprocessor option, asks make ....

instead of outputting result of preprocessing, output rule suitable make describing dependencies of main source file.

with of few makefile tricks, write makefile automatically dealing dependencies, e.g. things like

 ## dependencies of foo.c  foo.d: foo.c       $(compile.c) -m $^ -o $@  ## include them  -include foo.d

about $(wildcard *.c), read gnu make documentation, section on file name functions. $(wildcard *.c) globbing *.c make expanding list of files ending .c; use e.g. define make variable: source_files= $(wildcard *.c), etc.

see this, that , that examples.

don't forget try make -p understand builtin rules known gnu make.... use make --trace or remake-x debugging makefile-s.


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