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    SubjectRe: Per option CFLAGS?
    On Sat, Sep 15, 2007 at 01:30:21AM +0200, Rene Herman wrote:
    > On 09/15/2007 01:13 AM, H. Peter Anvin wrote:
    >
    >> Rene Herman wrote:
    >
    >>> I have a single file foo.c that I want to generate two (ALSA) modules
    >>> from, snd-foo2000.ko and snd-foo2001.ko, by compiling with either
    >>> FOO2000 or FOO2001 defined.
    >>>
    >>> I can do this, and ALSA does this a few times, by providing dummy
    >>> foo2000.c and foo2001.c files, like:
    >>>
    >>> === foo2000.c
    >>> #define FOO2000
    >>> #include "foo.c"
    >>> ===
    >>>
    >>> and a regular Makefile
    >>>
    >>> ===
    >>> foo2000-objs := foo2000.o
    >>> foo2001-objs := foo2001.o
    >>>
    >>> obj-$(CONFIG_SND_FOO2000) += snd-foo2000.o
    >>> obj-$(CONFIG_SND_F002001) += snd-foo2001.o
    >>> ===
    >>>
    >>> That #include is a little lame though. Is there a nicer way? I noticed
    >>> the per-file CFLAGS, but given that it's one source file for both, that
    >>> doesn't fit.
    >>>
    >> The stub source file is usually considered a good way to do this.
    >
    > Mmm. If I'll have to live with it, I can, but thought I'd ask if there was
    > some nice build trickery available instead.

    The usual trick is to create _three_ modules:

    Two with the foo2000 and foo2001 specific parts, and a third one with
    all code used by both.

    Or if foo2000 and foo2001 differ only in small details, create one
    snd-foo200x module supporting both at the same time.

    > Rene.

    cu
    Adrian

    --

    "Is there not promise of rain?" Ling Tan asked suddenly out
    of the darkness. There had been need of rain for many days.
    "Only a promise," Lao Er said.
    Pearl S. Buck - Dragon Seed

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