[Bug c++/86598] Incorrect lexing of pp-numbers in C++11 due to hexfloat extension

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86598

--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Fri, 20 Jul 2018, zhonghao at pku dot org.cn wrote:

> g++ rejects the above code:

You don't say what options you are using, or what compiler version; please 
include that in future bug reports that assert something about how the 
compiler behaves.  For standards conformance issues like this you should 
be using strict conformance modes.  I don't see this rejection with any of 
-std=c++98, -std=c++11, -std=c++14.  That would be what was fixed for 
C++11/C++14 modes with r234213 ("Hex floats are new in C++1z."), and for 
C++98 mode as bug 23827.