Problem compiling Cypress software with IAR - bluetooth-lowenergy

Question

I've a Cypress BLE module and have compilation problem with IAR.
In "ezsapi.h" are defined this macros:
#ifdef __GNUC__
/* standard GNU C */
#ifdef _WIN32
/* MinGW, Cygwin, TDM-GCC, etc. */
#define __PACKDEF(STRUCTNAME, STRUCTDEF) typedef struct STRUCTDEF __attribute__((__packed__,gcc_struct)) STRUCTNAME
#else
/* generic gcc */
#define __PACKDEF(STRUCTNAME, STRUCTDEF) typedef struct STRUCTDEF __attribute__((__packed__)) STRUCTNAME
#endif
#define ALIGNED __attribute__((aligned(0x4)))
#else
/* Microsoft Visual C++ */
#define __PACKDEF(STRUCTNAME, STRUCTDEF) __pragma(pack(push, 1)) STRUCTDEF __pragma(pack(pop)) STRUCTNAME
#define ALIGNED
#endif
IAR usually use #pragma pack(push,1) and #pragma pack(pop) and I tryed to modify the macro in:
#define __PACKDEF(STRUCTNAME, STRUCTDEF) #pragma(pack(push, 1)) STRUCTDEF #pragma(pack(pop)) STRUCTNAME
With original macros the errors reported is:
ezsapi.h(694) : Error[Pe020]: identifier "pack" is undefined
ezsapi.h(694) : Error[Pe018]: expected a ")" ezsapi.h(694) :
Error[Pe079]: expected a type specifier ezsapi.h(694) : Error[Pe260]:
explicit type is missing ("int" assumed) ezsapi.h(694) : Error[Pe141]:
unnamed prototyped parameters not allowed when body is present
ezsapi.h(694) : Error[Pe130]: expected a "{"
and with my macro the errors reported is:
(69 is the line where the macro is located)
ezsapi.h(69) : Error[Pe052]: expected a macro parameter name
ezsapi.h(69) : Error[Pe052]: expected a macro parameter name
ezsapi.h(694) : Error[Pe020]: identifier "pack" is undefined
ezsapi.h(694) : Error[Pe018]: expected a ")" ezsapi.h(694) :
Error[Pe079]: expected a type specifier ezsapi.h(694) : Error[Pe260]:
explicit type is missing ("int" assumed) ezsapi.h(694) : Error[Pe141]:
unnamed prototyped parameters not allowed when body is present
ezsapi.h(694) : Error[Pe130]: expected a "{"
What's the correct formula for IAR?
What's escaping me?
Thanks.

Answer 1

There are two ways of solving this problem. My suggestion is that you use the __packed type attibute instead of #pragma pack() as this has a more well defined meaning. This, however, needs IAR language extensions to be switched on. If you can't enable language extensions or for some other reason need to use pack-pragma you have to use an alternative pragma syntax to be able to include it in a preprocessor macro. If you use _Pragma("pack(push,1)") and _Pragma("pack(pop)") you macro should work as expected. Definitions of PACKDEF for both alternatives are shown below:
#define PACKDEF(STRUCTNAME, STRUCTDEF) typedef __packed struct STRUCTDEF STRUCTNAME
#define PACKDEF(STRUCTNAME, STRUCTDEF) _Pragma("pack(push,1)") typedef struct STRUCTDEF STRUCTNAME _Pragma("pack(pop)")