MC9S12 : SCI programming

KA
To my very limited understanding #PRAGMA is used in C to tell the
compiler some condition which is not default. I can't tell you anything
else. Except I've seen '#pragma asm' in c code to simpilfy expersions
which are easier in asm then c. 

Regards
Malt

Malt wrote:
 >
> To my very limited understanding #PRAGMA is used in C to tell
> the compiler some condition which is not default. I can't tell
> you anything else. Except I've seen '#pragma asm' in c code to
> simpilfy expersions which are easier in asm then c.

The following quote from N869 (draft C standard) is all you know 
about pragma.  The update to this is N1124.  Note that pragma is in 
lower case.  Use of pragma seriously harms portability.

   6.10.6  Pragma directive

   Semantics

   [#1] A preprocessing directive of the form

     # pragma pp-tokens-opt new-line

   where  the  preprocessing  token  STDC  does not immediately
   follow  pragma  in  the  directive  (prior  to   any   macro
   replacement)136) causes the implementation to behave  in  an
   implementation-defined  manner.   The  behavior  might cause
   translation to fail or cause the translator or the resulting
   program  to  behave  in  a  non-conforming manner.  Any such
   pragma that is  not  recognized  by  the  implementation  is
   ignored.

   ____________________

   136An  implementation  is  not  required  to  perform  macro
      replacement in pragmas, but it is permitted except for in
      standard pragmas (where STDC immediately follows pragma).
      If the result of  macro  replacement  in  a  non-standard
      pragma  has  the  same  form  as  a  standard pragma, the
      behavior    is    still    implementation-defined;     an
      implementation  is  permitted to behave as if it were the
      standard pragma, but is not required to.


   [#2] If the preprocessing token STDC does immediately follow
   pragma in the directive (prior to  any  macro  replacement),
   then no macro replacement is performed on the directive, and
   the directive shall have one of the  following  forms  whose
   meanings are described elsewhere:

     #pragma STDC FP_CONTRACT on-off-switch
     #pragma STDC FENV_ACCESS on-off-switch
     #pragma STDC CX_LIMITED_RANGE on-off-switch

     on-off-switch:  one of
                   ON      OFF     DEFAULT

   Forward  references:   the  FP_CONTRACT pragma (7.12.2), the
   FENV_ACCESS  pragma  (7.6.1),  the  CX_LIMITED_RANGE  pragma
   (7.3.4).


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