[Scons-users] Dependency missed when the included filename is defined by a preprocessor macro

[Jean-Baptiste Lab]

Hi Julien,

That would require that SCons implements a fully-fledged preprocessor...
It is not the case now and I don't think this is on the roadmap.

However, you could maybe wrap the Program builder in a function that
would automatically add the HELLO_H value to the dependencies with
env.Depends(), using a new env variable like PREPOC_HEADERS?

Hope this helps,

JB

On 2017-03-14 11:16, Julien Pommier wrote:
> Hi, 
>
> I’m using a library that #includes a header file whose name is defined
> by a preprocessor macro. Unfortunately, scons does not seem to add
> this file to the dependency list of the file that does the #include
>
> Here is a short example:
>
> I have a hello.c file that is:
>
> #include HELLO_H
> #include <stdio.h>
> int main() {
>   printf(MESSAGE);
>   return 0;
> }
>
> and a hello.h file that is:
>
> #define MESSAGE "HELLO\n”
>
> My SConstruct is:
>
> env=Environment()
> env.Append(CPPDEFINES={'HELLO_H':'\'"hello.h"\'’})
> env.Program('hello.c’)
>
>
> The hello program is not rebuilt when I edit the content of ‘hello.h’. 
>
> Is there a workaround for that ? I know I can add a Depends(‘hello.c’,
> ‘hello.h’) , but that is not a very convenient solution for me, as I
> would have to do it in many places.
>
> Best regards,
> Julien
>
>
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