Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 5 Nov 2015 10:13:36 -0600

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Hi Ben,

On 11/05/2015 09:53 AM, Benjamin Franksen wrote:
>> Your -MG solution assumes that we only use gcc to build Base,
>> which is not true for some targets, and it doesn't always result
>> in the correct dependency information being output.
> 
> Right, forgot about the other compilers. (Apparently they all
> support -MM -MF, I wouldn't have expected that.)

Not really, not architectures only include the CONFIG.gnuCommon file
if they use the GNU toolset. On Windows MINGW and Cygwin builds do,
but those using the Microsoft compilers don't so they don't see the
- -MM -MF flags that appear in that file.

> Anyway, as it turns out, an order dependency suffices in my case,
> since the generated snl.h itself never includes anything, so the
> *.d files never need to be rebuilt when it changes. And since it's
> just an order dependency, it doesn't hurt to declare it for _all_
> *.d files:
> 
> $(HDEPENDS_FILES): | snl.h
> 
> If I haven't overlooked something subtle this should nicely solve
> the problem.

Genius, that looks like a great solution!

- - Andrew

- -- 
Light thinks it travels faster than anything but it is wrong.
No matter how fast light travels, it finds the darkness has
always got there first, and is waiting for it.
    -- Terry Pratchett, Reaper Man
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System