Synopsis - Issue Tracker

the Cpp processor (specifically, the ucpp backend)
has issues with the boost preprocesser library.

Thomas Pornin, the author of ucpp, writes:

"
Actually it is not a ucpp bug, but a boost bug. The boost author
does not agree.

This is somewhat described in ucpp's README file, with the
following example:

#define CAT(a, b)    CAT_(a, b)
#define CAT_(a, b)   a ## b
#define AB(x, y)     CAT(x, y)
CAT(A, B)(X, Y)

ucpp will return "CAT(X, Y)" whereas some other preprocessors (most
notably the one in gcc) will make it "XY". Which behaviour is "correct"
is actually undefined, and the standard committee asserted so
explicitely in 1992, in response to a defect report.
"

What can synopsis do to work around this problem ?
What is the correct answer, and what the most
practical ?
Are there flags that bypass this construct in boost ? There must be other compilers/preprocessors
having issues with this code...

All I can say is, that Wave produces XY as well, which makes me believe that this is correct ;-)

But seriously, I don't see any reason why the second CAT shouldn't be expanded because the CAT macro is disabled only during its expansion (disabling ends on the first ')') and it is re-enabled afterwards. To illustrate the actual expansion process I've attached the expansion trace produced by Wave from the given code snippet:

file test.cpp:
#pragma wave trace (on)
#define CAT(a, b)    CAT_(a, b)
#define CAT_(a, b)   a ## b
#define AB(x, y)     CAT(x, y)
CAT(A, B)(X, Y)

command line:
wave --traceto trace.txt test.cpp

Regards Hartmut

Hartmut Kaiser via synopsis issue tracker wrote:
> Hartmut Kaiser <hkaiser@users.sourceforge.net> added the comment:
> 
> All I can say is, that Wave produces XY as well, which makes me believe that this is correct ;-)

uhm, the ucpp author claims that according to the standard (which I'm
not familiar with) this is undefined territory.
The fact that gcc as well as wave both interpret the standard the same
way as the author of the boost preprocessor library is of practical
value, but doesn't make the macro correct. ;-)

Hartmut, do you have any plans for helping me write the wave backend
for synopsis ? As wave was just accepted to be part of boost, you
are probably going to integrate the code into boost mainline if you
haven't done so already. Any chance we could use wave as an (optional)
Cpp backend in synopsis ? That would nicely solve this bug :-)

> Hartmut, do you have any plans for helping me write the wave backend
> for synopsis ? As wave was just accepted to be part of boost, you
> are probably going to integrate the code into boost mainline if you
> haven't done so already. Any chance we could use wave as an (optional)
> Cpp backend in synopsis ? That would nicely solve this bug :-)

Yeah, you're right. And no, I haven't forgotten my promise to help you with this...
Sorry for that, but I'm currently quite busy. 
I'll try to raise the priority of this a bit so I hopefully can return to it RSN.

Regards Hartmut

Hartmut Kaiser via synopsis issue tracker wrote:

> Yeah, you're right. And no, I haven't forgotten my promise to help you with this...
> Sorry for that, but I'm currently quite busy. 
> I'll try to raise the priority of this a bit so I hopefully can return to it RSN.

Excellent ! May be I'll just check out boost and try to write
a little wave-based applet with a bunch of callbacks. Just to
get the ball rolling.
Let's continue this on task24 ...

The fix is to switch to wave, later. See task24.

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