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

[Julien Pommier]

Nope that was not me :) I assume this is the pull request you mentionned ?

https://bitbucket.org/scons/scons/pull-requests/380/improvements-for-scons-c-c-pre-processor/diff


> On 14 Mar 2017, at 16:24, Bill Deegan <bill at baddogconsulting.com> wrote:
> 
> I beleive you asked this question on stackoverflow and I pointed you at a pull request which has much of the preprocessor functionality in it.
> We've not yet merged it, its a work in progress.
> 
> Please give that a try.
> -Bill
> SCons Project co-manager
> 
> On Tue, Mar 14, 2017 at 8:04 AM, Jean-Baptiste Lab <jeanbaptiste.lab at gmail.com <mailto:jeanbaptiste.lab at gmail.com>> wrote:
> 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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> 
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