spaces in macro and boost::icl

clmacro.cpp

/* 
   Encountered while building with FASTbuild cache on a library using boost::icl

   See element_iterator.hpp and ICL_INTERVAL_TYPE.

   FASTbuild uses cl.exe -P to produce a pre-processed file. That file gets a const stitched onto it.

   Steps to reproduce:
   1- compile with cl.exe clmacro.cpp
   2- compile with cl.exe -P -Ficlmacro.i.cpp clmacro.cpp && cl.exe clmacro.i.cpp

   Expected:
   - 1 & 2 compile
   
   Observed:
   - only 1 compiles
*/

#define funny_type(__x) __x

// this fixes it in MSVC:
#define funny_type_guard
#define funny_type2(__x) __x funny_type_guard

int main(void)
{
  funny_type(int)const a = 2; // cl.exe -P clmacro.cpp -> `intconst a`
  funny_type2(int)const b = 4; // cl.exe -P clmacro.cpp -> `int const b`
}

Does this happen with cl.exe -E, too?