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From:	<ams AT ludd DOT luth DOT se>
Message-Id:	<200311050038.hA50cEoS001039@speedy.ludd.luth.se>
Subject:	Re: C99 Functions Under Development and Checkout
In-Reply-To:	<3FA80338.C83BB2BD@phekda.freeserve.co.uk> "from Richard Dawe at
	Nov 4, 2003 07:51:20 pm"
To:	djgpp-workers AT delorie DOT com
Date:	Wed, 5 Nov 2003 01:38:14 +0100 (CET)
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According to Richard Dawe:
> An "identifier with external linkage" in this case would be a global variable.
> 
> I guess the two options you have are:
> 
> (1) In a new source module define a library internal function to return the
> error-handling status. E.g.:
> 
> #include <math.h>
> 
> static const int __math_errhandling = MATH_ERRNO|MATH_ERREXCEPT;
> 
> int __get_math_errhandling (void)
> {
>   return __math_errhandling;
> }
> 
> Then in <math.h> define the macro to call the function:
> 
> extern int __get_math_errhandling(void);
> #define math_errhandling (__get_math_errhandling());
> 
> (2) Just define the macro:
> 
> #define math_errhandling (MATH_ERRNO|MATH_ERREXCEPT)

(3) just define the variable:
<math.h>:
extern int math_errhandling; /* Perhaps with const too. */

some/path/math_err.c:
int math_errhandling = SOME_VALUE;

?


Right,

						MartinS

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