How to add a or condition in ifdef

Question

How can I add a  or  condition in  ifdef    I have tried    ifdef CONDITION1    CONDITION2   endif   This does not work

User · Accepted Answer

if defined CONDITION1     defined CONDITION2    should work       ifdef is a bit less typing  but doesn t work well with more complex conditions

User · Answer

I am really OCD about maintaining strict column limits  and not a fan of     line continuation because you can t put a comment after it  so here is my method                                                                                           ifdef  CONDITION 01                            define             TEMP MACRO                  endif                                          ifdef  CONDITION 02                            define             TEMP MACRO                  endif                                          ifdef  CONDITION 03                            define             TEMP MACRO                  endif                                          ifdef              TEMP MACRO                    -  --  --  --  --  --  --  --  --  --  -     printf   IF CONDITION  1 2 3   n        -  --  --  --  --  --  --  --  --  --  -     endif                                          undef              TEMP MACRO

User · Answer

May use this-   if defined CONDITION1    defined CONDITION2   your code here  endif   This also does the same-   if defined CONDITION1     defined CONDITION2    your code here  endif     Further-   AND   if defined CONDITION1  amp  amp  defined CONDITION2 XOR   if defined CONDITION1   defined CONDITION2 AND NOT   if defined CONDITION1  amp  amp   defined CONDITION2

[c-preprocessor] How to add a 'or' condition in #ifdef

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