jacob navia wrote:
Chris Dollin wrote:
>amit wrote:
>>how to stop or change structure padding ???
(a) See your local implementation manual for the
implementation-specific way to do this.
(b, preferred if plausible) Write your code so that it doesn't
care about structure padding even if there is any.
Why do you think you want to stop or change structure padding?
We had a discussion about the #pragma pack construct in this
group several weeks ago. Google for it, since we gave a detailed
discussion about that construct in many different situations and
compilers
Once more, Jacob is off-topic and not portable. See the following
extract from N869:
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
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[page]: <http://cbfalconer.home.att.net>
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