STR16 is CHAR16*, so ScreenMsg asked for a mutable format string it has no
intention of mutating: the body only hands it to va_start and vswprintf, and
vswprintf takes it as const.
Calls that pass a literal are accepted anyway under the MSVC rules clang-cl
applies. Calls that pass anything else are not, and DynamicDialogue.cpp picks
the format at runtime:
ScreenMsg( FONT_MCOLOR_LTGREEN, MSG_INTERFACE,
...sOpinionModifier >= 0 ? L"%s: %s +%d" : L"%s: %s %d", ... );
The conditional has type const wchar_t*, and there is nowhere for it to go.
Declaring the parameter const CHAR16* is what the function always meant. Every
existing caller still compiles: a literal and a CHAR16* both convert.
Verification:
ninja -C build parse # DynamicDialogue.cpp clean
ninja -C build -k 0 # Release, four applications, green
ninja -C build-debug -k 0 # Debug, four applications, green
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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