http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60434

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |burnus at gcc dot gnu.org

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> ---
On Linux, g++ 4.8 and 4.9 warn, independently of -std=, as follows:

test.cc:6:19: warning: format '%f' expects argument of type 'double', but
argument 2 has type 'long double' [-Wformat=]
test.cc:7:20: warning: format '%lf' expects argument of type 'double', but
argument 2 has type 'long double' [-Wformat=]
test.cc:13:20: warning: format '%Lf' expects argument of type 'long double',
but argument 2 has type 'double' [-Wformat=]

That looks sensible to me. Do you get something different on Windows?

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