Question

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C/C++ pragma in define macro
Conditional “pragma omp”

How can I use an OpenMP pragmas inside a macro definition? E.g.

#define A() { \
 ...a lot of code... \
 #pragma omp for     \
 for(..)             \
  ..do_for..         \
 ...another a lot of code \
 }

Answer 1

As it was answered here Conditional "pragma omp"

C99 has the _Pragma keyword that allows you to place what otherwise would be #pragma inside macros. Something like

  #define OMP_PARA_INTERNAL _Pragma("omp parallel for")

So,

#define OMP_PARA_FOR _Pragma("omp for")
#define A() { \
 ...a lot of code... \
 OMP_PARA_FOR     \
 for(..)             \
  ..do_for..         \
 ...another a lot of code \
 }

several _Pragmas can be combined as unary operator, e.g.:

_Pragma("first pragma") _Pragma("Second pragma")