Re: [PATCH v2] Makefile: add option to disable automatic dependency generation

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On Fri, Nov 18, 2011 at 4:58 PM, Jonathan Nieder <jrnieder@xxxxxxxxx> wrote:
> Now that the COMPUTE_HEADER_DEPENDENCIES feature is turned on
> automatically for compilers that support it (see v1.7.8-rc0~142^2~1,
> 2011-08-18), there is no easy way to force it off.  For example,
> setting COMPUTE_HEADER_DEPENDENCIES to the empty string in config.mak
> just tells the makefile to treat it as undefined and run a test
> command to see if the -MMD option is supported.
>
> So allow setting COMPUTE_HEADER_DEPENDENCIES=no to explicitly force
> the feature off.  The new semantics:
>
>  - "yes" means to explicitly enable the feature
>  - "no" means to disable it
>  - "auto" means to autodetect
>
> The default is still "auto".  Any value other than these three will
> cause the build to error out with a descriptive message so typos and
> stale settings in config.mak don't result in mysterious behavior.
>
>        Makefile:1278: *** please set COMPUTE_HEADER_DEPENDENCIES to
>        yes, no, or auto (not "1").  Stop.
>
> So now when someone using a compiler without -MMD support reports
> trouble building git, you can reproduce it by running "make
> COMPUTE_HEADER_DEPENDENCIES=no".
>
> Suggested-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
> Improved-by: Junio C Hamano <gitster@xxxxxxxxx>
> Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>

Tested-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
-- 
Duy
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