Re: dependency issue

[Lynn Lin]

On Wed, Aug 25, 2010 at 10:47 PM, Kristof Provost <address@hidden> wrote:
> On 2010-08-25 19:35:27 (+0800), Lynn Lin <address@hidden> wrote:
>> All,
>>    I use the following rules to generate dependency automatically
>>
>> %.P : %.cpp
>>         $(QUIET_MM)rm -f $@; \
>>         $(CPP) -M $(CPPFLAGS) $(CXXFLAGS) $(INCLUDES)  $< > address@hidden; \
>
> Try with the -MP option, rather than the -M option.
seems good,however it shows

cc1plus: error: to generate dependencies you must specify either -M or -MM


> From the gcc man page:
>
>  -MP This option instructs CPP to add a phony target for each dependency
>     other than the main file, causing each to depend on nothing. These
>     dummy rules work around errors make gives if you remove header
>     files without updating the Makefile to match.
>
> Regards,
> Kristof
>
>