Re: When some files need special compilation flags, ...

[Greg Chicares]

[Reformatted--please break lines at a reasonable length,
especially when quoting source code. Thanks.]

On 2008-07-08 05:20Z, x z wrote:
> So, how to write a Makefile that can accomodate the inclusion
> of certain flags when compiling certain files?
> Of course, one can always set up separate rules for these
> special files, and a general rule (without those flags) for the
> rest.  But that looks clumsy:
> SRCS    =       file1.c file2.c file3.c .....
> OBJ     =       ${SRCS:.c=.o}
> $(OBJ): %.o: %.c
>         $(CC) -c $< -o $@
> special1.o: special1.c
>         $(CC) -D_POSIX_PTHREAD_SEMANTICS -c $< -o $@
> special2.o: special2.c
>         $(CC) -D_POSIX_C_SOURCE -c $< -o $@

special1.o: extra_cpp_flags := -D_POSIX_PTHREAD_SEMANTICS
special2.o: extra_cpp_flags := -D_POSIX_C_SOURCE

Then pass $(extra_cpp_flags) to the generic command, e.g.:
        $(CC) $(extra_cpp_flags) -c $< -o $@