GNU gettext with Emacs source context might do it.  You'd have to invent your 
own tags, in lieu of of __FILE__, etc.

https://www.gnu.org/software/gettext/manual/html_node/C-Sources-Context.html#C-Sources-Context

It seems to me the general problem is that C preprocessor does not give you the 
full power of C.   One cannot simply define a function to hash the __FILE__ 
string at compile time.   There's no quasi-quote like in Lisp or Haskell.  

Marcus
-----Original Message-----
From: gcc-ow...@gcc.gnu.org [mailto:gcc-ow...@gcc.gnu.org] On Behalf Of Shoham 
Peller
Sent: Sunday, April 26, 2015 3:53 PM
To: Jonathan Wakely
Cc: gcc@gcc.gnu.org; Guy Lewin
Subject: Re: WPP capabilities in gcc

SystemTap does not give a solution for this, and is not really intended for 
this use:

* It's no cross-platform, it's for Linux
* It doesn't allow the developer to write the text he wants
* It doesn't parse the tracing string

The solution I'm talking about is:
* cross platform
* Will allow you to write arbitrary trace string
* Parses the string and the parameters in it (%s, %d) and makes sure they are 
traced too.

On Mon, Apr 27, 2015 at 12:21 AM, Jonathan Wakely <jwakely....@gmail.com> wrote:
> On 26 April 2015 at 18:47, Shoham Peller wrote:
>> 1. Can you think of a way to achieve this with gcc?
>
> Insert SystemTap probe points.

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