[FEA]: Compiler independent _CCCL_PRAGMA

[DejvBayer]

Is this a duplicate?

• I confirmed there appear to be no duplicate issues for this request and that I agree to the Code of Conduct

Area

General CCCL

Is your feature request related to a problem? Please describe.

In the code base, for MSVC it is prefered to use __pragma over standard _Pragma. This leads to code duplication in many cases.

Describe the solution you'd like

Provide compiler independent _CCCL_PRAGMA macro implemented as (or something similar):

#define _CCCL_STRINGIFY2(x) #x
#define _CCCL_STRINGIFY(x) _CCCL_STRINGIFY2(x)

#ifdef _CCCL_COMPILER_MSVC
#  define _CCCL_PRAGMA(x) __pragma(x)
#else
#  define _CCCL_PRAGMA(x) _Pragma(_CCCL_STRINGIFY(x))
#endif

It may be used as:

#ifdef _CCCL_COMPILER_MSVC
_CCCL_PRAGMA(message("Hi from MSVC"))
#else
_CCCL_PRAGMA(message "Hi from other compiler")
#endif

Describe alternatives you've considered

No response

Additional context

No response