Fix MSVC compile error C3688

[bobqianic]

Instead of simply using add_compile_options(/utf-8) to address the MSVC compile error C3688, a better approach would be to handle it in a way that prevents passing /utf-8 to NVCC.

A proper fix for error C3688 should look something like this:

    if (MSVC)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /utf-8")
        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /utf-8")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /utf-8")
        if(NOT WHISPER_NO_AVX2)
            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX2")
            set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /arch:AVX2")
            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /arch:AVX2")
        else()
            if(NOT WHISPER_NO_AVX)
                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX")
                set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /arch:AVX")
                set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /arch:AVX")
            endif()
        endif()
    else()

Before:

C:\Program Files\CMake\bin>"C:\Program Files\CMake\bin\cmake.exe" --build D:\Temp\Download\whiper_build --config release

用于 .NET Framework 的 Microsoft (R) 生成引擎版本 17.1.0+ae57d105c
版权所有(C) Microsoft Corporation。保留所有权利。

  1>Checking Build System
  Building Custom Rule D:/Temp/Download/whisper.cpp-master/CMakeLists.txt
  Compiling CUDA source file ..\whisper.cpp-master\ggml-cuda.cu...

  D:\Temp\Download\whiper_build>"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v12.2\bin\nvcc.exe"  --use-local-en
  v -ccbin "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.31.31103\bin\HostX64\x64" -x cu
  -I"D:\Temp\Download\whisper.cpp-master\." -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v12.2\include" -I"C:\
  Program Files\NVIDIA GPU Computing Toolkit\CUDA\v12.2\include"     --keep-dir x64\release  -maxrregcount=0   --machin
  e 64 --compile -cudart static -std=c++14 -Xcompiler="/EHsc -Ob2"   -D_WINDOWS -DNDEBUG -DWHISPER_SHARED -DGGML_SHARED
   -DWHISPER_BUILD -DGGML_BUILD -D_CRT_SECURE_NO_WARNINGS -DGGML_USE_CUBLAS -D"CMAKE_INTDIR=\"Release\"" -Dwhisper_EXPO
  RTS -D_WINDLL -D_MBCS -DWIN32 -D_WINDOWS -DNDEBUG -DWHISPER_SHARED -DGGML_SHARED -DWHISPER_BUILD -DGGML_BUILD -D_CRT_
  SECURE_NO_WARNINGS -DGGML_USE_CUBLAS -D"CMAKE_INTDIR=\"Release\"" -Dwhisper_EXPORTS -Xcompiler "/EHsc /W3 /nologo /O2
   /FS   /MD /GR" -Xcompiler "/Fdwhisper.dir\Release\vc143.pdb" -o whisper.dir\Release\ggml-cuda.obj "D:\Temp\Download\
  whisper.cpp-master\ggml-cuda.cu"
  ggml-cuda.cu
  tmpxft_00006fd4_00000000-7_ggml-cuda.cudafe1.cpp
  ggml.c
  whisper.cpp
D:\Temp\Download\whisper.cpp-master\whisper.cpp(3441,1): warning C4819: 该文件包含不能在当前代码页(936)中表示的字符。请
将该文件保存为 Unicode 格式以防止
数据丢失 [D:\Temp\Download\whiper_build\whisper.vcxproj]
D:\Temp\Download\whisper.cpp-master\whisper.cpp(3614,47): error C3688: 文本后缀“銆”无效；未找到文文本运算符或文本运算符 模板“operator """"銆” [D:\
Temp\Download\whiper_build\whisper.vcxproj]
D:\Temp\Download\whisper.cpp-master\whisper.cpp(3614,61): error C3688: 文本后缀“銆”无效；未找到文文本运算符或文本运算符 模板“operator """"銆” [D:\
Temp\Download\whiper_build\whisper.vcxproj]
D:\Temp\Download\whisper.cpp-master\whisper.cpp(3616,25): error C3688: 文本后缀“鈾”无效；未找到文文本运算符或文本运算符 模板“operator """"鈾” [D:\
Temp\Download\whiper_build\whisper.vcxproj]
D:\Temp\Download\whisper.cpp-master\whisper.cpp(3616,39): error C3688: 文本后缀“鈾”无效；未找到文文本运算符或文本运算符 模板“operator """"鈾” [D:\
Temp\Download\whiper_build\whisper.vcxproj]
D:\Temp\Download\whisper.cpp-master\whisper.cpp(3616,53): error C3688: 文本后缀“鈾”无效；未找到文文本运算符或文本运算符 模板“operator """"鈾” [D:\
Temp\Download\whiper_build\whisper.vcxproj]
D:\Temp\Download\whisper.cpp-master\whisper.cpp(3617,1): error C3688: 文本后缀“鈾”无效；未找到文文本运算符或文本运算符模板“operator """"鈾” [D:\T
emp\Download\whiper_build\whisper.vcxproj]

After:

C:\Program Files\CMake\bin>"C:\Program Files\CMake\bin\cmake.exe" --build D:\Temp\Download\whiper_build --config release

用于 .NET Framework 的 Microsoft (R) 生成引擎版本 17.1.0+ae57d105c
版权所有(C) Microsoft Corporation。保留所有权利。

  1>Checking Build System
  Building Custom Rule D:/Temp/Download/whisper.cpp-master/CMakeLists.txt
  ggml.c
  whisper.cpp
    正在创建库 D:/Temp/Download/whiper_build/Release/whisper.lib 和对象 D:/Temp/Download/whiper_build/Release/whisper.exp
  whisper.vcxproj -> D:\Temp\Download\whiper_build\bin\Release\whisper.dll
  Building Custom Rule D:/Temp/Download/whisper.cpp-master/examples/bench/CMakeLists.txt
  bench.cpp
  bench.vcxproj -> D:\Temp\Download\whiper_build\bin\Release\bench.exe
  Building Custom Rule D:/Temp/Download/whisper.cpp-master/examples/CMakeLists.txt
  common.cpp
  common-ggml.cpp
  正在生成代码...
  common.vcxproj -> D:\Temp\Download\whiper_build\examples\Release\common.lib
  Building Custom Rule D:/Temp/Download/whisper.cpp-master/examples/main/CMakeLists.txt
  main.cpp
  main.vcxproj -> D:\Temp\Download\whiper_build\bin\Release\main.exe
  Building Custom Rule D:/Temp/Download/whisper.cpp-master/examples/quantize/CMakeLists.txt
  quantize.cpp
  quantize.vcxproj -> D:\Temp\Download\whiper_build\bin\Release\quantize.exe
  Building Custom Rule D:/Temp/Download/whisper.cpp-master/CMakeLists.txt

[bobqianic]

#1135