Macro stopped to compile on Linux

Question

I have a library with several macros, it compiles fine on AIX, but now i need to compile the same code and it seems the macros stopped to work. I keep receiving the message:

error: pasting "::" and "EVENT_DATA" does not give a valid preprocessing token.

Is there a way to make the c++ preprocessor on linux acts like on aix. I'm using g++ on linux and xlc_r on AIX.

Here is one of the macros.

#define E_TRA_INMOD(MName, Comp) \
   static const ES_TracMg::ES_TracComps ES_TracComp = \
                                    ES_TracMg::##Comp; \
   static char* ES_Mod_Namp = MName; \
   static unsigned long ES_SerMas = \
               ES_TracMg::m_MServ[ES_TracMg##Comp];

I call it like E_TRA_INMOD("Error", EVENT_DATA);
The error is:

error: pasting "::" and "EVENT_DATA" does not give a valid preprocessing token.

What is the error message? Or what is it you are getting and you don't like? — David Rodríguez - dribeas, Feb 25 '13 at 18:10
The error message is: error: pasting "::" and "EVENT_DATA" does not give a valid preprocessing token. — Lefsler, Feb 25 '13 at 18:10
you can use `cpp` programm to see your sources after preprocessing — ShPavel, Feb 25 '13 at 18:16
The error message does not seem to relate to the use that you point to, where is `EVENT_DATA` in your code? — David Rodríguez - dribeas, Feb 25 '13 at 18:23
Sorry, i have several error messages, so i copied one of them — Lefsler, Feb 25 '13 at 18:32

score 2 · Accepted Answer · answered Feb 25 '13 at 18:14

I think you don't want to use ## here:

#define E_TRA_INMOD(MName, Comp) \
   static const ES_TracMg::ES_TracComps ES_TracComp = \
                                    ES_TracMg::##Comp; \

It should be

#define E_TRA_INMOD(MName, Comp) \
   static const ES_TracMg::ES_TracComps ES_TracComp = \
                                    ES_TracMg::Comp; \

You don't have two tokens to glue together into a single token, you just have whatever Comp expands to.

score 0 · Answer 2 · answered Feb 25 '13 at 18:16

What are you trying to do in the macro? It looks like the first token paste is redundant:

#define E_TRA_INMOD(MName,Comp) \
   static const ES_TracMg::ES_TracComps ES_TracComp = \
                                    ES_TracMg::Comp; \
   static char* ES_Mod_Namp = MName; \
   static unsigned long ES_SerMas = \
               ES_TracMg::m_MServ[ES_TracMg##Comp];

Macro stopped to compile on Linux

2 Answers2