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User forums => Using Code::Blocks => Topic started by: pozzugno on August 07, 2012, 12:42:19 pm

Title: Build doesn't recompile with macro-define #include
Post by: pozzugno on August 07, 2012, 12:42:19 pm

Code: "main.c"

#define INC_FILE "test.h"
#include INC_FILE

If I build the project, change something in test.h and re-build, C::B doesn't recompile.
It thinks all dependecies of main.c are satisfied. It is not able to consider test.h a dependecy for main.c, because it is a macro-replaced include file.
If I write:

Code

#include "test.h"

it works.

Consider that I already added test.h file in the project.

Is there a solution to this problem?

Title: Re: Build doesn't recompile with macro-define #include
Post by: oBFusCATed on August 07, 2012, 01:07:19 pm

Yes, don't use the macro hack  :P

The other option is to patch depslib to parse this correctly.

Title: Re: Build doesn't recompile with macro-define #include
Post by: thomas on August 07, 2012, 01:27:05 pm

Patching depslib may be much harder than it sounds, though. At least, in a portable, compiler-independent way.

It is not defined by the C standard how string concatenation or generally evaluation of macros within <> is implemented.
So, at best, one would be able to implement single-macro-expanding-to-single-string-literal substitution.

Title: Re: Build doesn't recompile with macro-define #include
Post by: pozzugno on August 07, 2012, 03:36:33 pm

Ok, it seems C::B is not able to automatically find include dependecies when the file included is a macro.

Is there the possibility to add this dependency manually? Can I say to C::B that main.c depends from the content of test.h too?

Title: Re: Build doesn't recompile with macro-define #include
Post by: MortenMacFly on August 07, 2012, 05:06:37 pm

Quote from: pozzugno on August 07, 2012, 03:36:33 pm

Is there the possibility to add this dependency manually? Can I say to C::B that main.c depends from the content of test.h too?

Using scripting as a pre-build step, yes.

Title: Re: Build doesn't recompile with macro-define #include
Post by: pozzugno on August 07, 2012, 05:32:23 pm

Quote

Using scripting as a pre-build step, yes.

I'm sorry, can you detail this point? Should I change the project to a custom makefile? What is the pre-build step to do?