On Tue, Jul 8, 2008 at 6:31 AM, Greg Chicares <[EMAIL PROTECTED]> wrote:
> [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 $@
Or...
special1.o: CFLAGS += -D_POSIX_PTHREAD_SEMANTICS
special2.o: CFLAGS += -D_POSIX_C_SOURCE
... assuming you don't have built-in rules turned off.
-Garrett
_______________________________________________
Help-make mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/help-make
