Re: [lmi] Fixing build with clang 7 and 64-bit Linux

[Vadim Zeitlin]

On Mon, 12 Nov 2018 23:24:08 +0100 I wrote:

Me>  Weirdly enough, the following program does give the expected error:
Me> ---------------------------------- >8 --------------------------------------
Me> % cat ctype_base_val.cpp
Me> #include <locale>
Me> 
Me> int main()
Me> {
Me>     constexpr std::ctype_base::mask z = {~std::ctype_base::space};
Me>     return z;
Me> }
Me> % g++-8 -Wall -std=c++17 ctype_base_val.cpp
Me> ctype_base_val.cpp: In function ‘int main()’:
Me> ctype_base_val.cpp:5:65: error: narrowing conversion of ‘-8193’ from ‘int’ 
to ‘std::ctype_base::mask’ {aka ‘short unsigned int’} inside { } [-Wnarrowing]
Me>      constexpr std::ctype_base::mask z = {~std::ctype_base::space};
Me>                                                                  ^
Me> ---------------------------------- >8 --------------------------------------
Me> but somehow it doesn't happen when the same code is inside a template. I
Me> think I should open a gcc bug report about this, unless you see something
Me> that I'm missing here.

 Just FYI, this is indeed a gcc bug, which I somehow hadn't found
originally even though I should have had:

        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78244

 Regards,
VZ