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Re: Make libstdc++ use strtold on MinGW
On Thu, 28 Feb 2008, NightStrike wrote:
> On 2/28/08, Joseph S. Myers <joseph@codesourcery.com> wrote:
> > libstdc++ has code (in config/locale/generic/c_locale.cc) that uses
> > strtold to convert strings to long double if available, falling back
> > to scanf %Lf if strtold is not available. MinGW has strtold - but
> > does not have working scanf %Lf (Kai Tietz's patch correctly records
> > this format as unavailable on Windows). Thus it's important for
>
>
> How does this affect the patch that Kai is working on?
If the relevant parts of libstdc++ are compiled with -Wformat, Kai's patch
would have correctly diagnosed the problem with the present code (whether
anyone would have noticed the warning and fixed it, as opposed to my
finding the problem through investigating test failures, is another
matter). Likewise with the printf code (there's an interesting issue
there: Windows printf doesn't support long double, but MinGW replaces
snprintf and vsnprintf only with versions that do, so a diagnostic is
strictly only correct for a subset of printf-family functions).
--
Joseph S. Myers
joseph@codesourcery.com