[Bug 222542] [exp-run] Update GCC_DEFAULT from 6 to 7

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222542

Jan Beich <jbeich at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |222415

--- Comment #11 from Jan Beich <jbeich at FreeBSD.org> ---
For one, "a constexpr specifier used in a function or static member variable
(since C++17) declaration implies inline." As USES=compiler:c++17-lang expands
to USE_GCC=yes a port relying on it will fail as following.

$ make -C emulators/citra
[...]
src/core/hle/applets/swkbd.cpp: In member function 'Frontend::KeyboardConfig
HLE::Applets::SoftwareKeyboard::ToFrontendConfig(const
HLE::Applets::SoftwareKeyboardConfig&) const':
src/core/hle/applets/swkbd.cpp:157:28: error: invalid conversion from 'const
void*' to 'void*' [-fpermissive]
     std::memcpy(buffer.data(), config.hint_text.data(), text_size *
sizeof(u16));
                 ~~~~~~~~~~~^~
In file included from /usr/local/lib/gcc6/include/c++/cstring:42:0,
                 from src/core/hle/applets/swkbd.cpp:6:
/usr/include/string.h:64:7: note:   initializing argument 1 of 'void*
memcpy(void*, const void*, size_t)'
 void *memcpy(void * __restrict, const void * __restrict, size_t);
       ^~~~~~
src/core/hle/applets/swkbd.cpp:172:36: error: invalid conversion from 'const
void*' to 'void*' [-fpermissive]
             std::memcpy(buffer.data(), text.data(), text_size * sizeof(u16));
                         ~~~~~~~~~~~^~
In file included from /usr/local/lib/gcc6/include/c++/cstring:42:0,
                 from src/core/hle/applets/swkbd.cpp:6:
/usr/include/string.h:64:7: note:   initializing argument 1 of 'void*
memcpy(void*, const void*, size_t)'
 void *memcpy(void * __restrict, const void * __restrict, size_t);
       ^~~~~~


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222415
[Bug 222415] [patch] Mk/Uses/compiler.mk: Add support for C++17
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