Hmmm, I don't think so. The docs say:
Warn if a prototype causes a type conversion that is different from
what would happen to the same argument in the absence of a prototype.
This includes conversions of fixed point to floating and vice versa,
and conversions changing the width or signedness of a fixed point
argument except when the same as the default promotion.
Also, warn if a negative integer constant expression is implicitly
converted to an unsigned type. For example, warn about the assignment
"x = -1" if "x" is unsigned. But do not warn about explicit casts
like "(unsigned) -1". [GCC_WARN_PROTOTYPE_CONVERSION, -Wconversion]
If I turn this on, I get thousands of warnings, none of which appear
to be telling me anything useful (i.e. the code is perfectly
legitimate). With that amount of noise if it does pick up the odd case
like this I'm never going to see it.
thanks anyway,
G.
On 6 Jun 2008, at 1:33 am, Randall Meadows wrote:
On Jun 5, 2008, at 9:26 AM, Graham Cox wrote:
It would be useful if there was a compiler warning for an implicit
cast or mismatch of return type in cases like this, because
otherwise they are devilishly hard to spot. If there is such a
warning, please tell me, so I can spare myself future hunts of this
kind (this one has taken a solid 11 hours to find and fix,
primarily because cause and effect were completely unrelated!)
GCC_WARN_PROTOTYPE_CONVERSION?
AKA "Prototype Conversion" in project settings.
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