問題發現經過
平臺：Windows10 LTSC,VS2017,python3.9

F:\program\git> git clone https://bitbucket.org/chromiumembedded/cef/src/master/ gn F:\program\git> cd gn F:\program\git\gn> python build/gen.py F:\program\git\gn> vcvarsall x64 ********************************************************************** ** Visual Studio 2017 Developer Command Prompt v15.9.21 ** Copyright (c) 2017 Microsoft Corporation ********************************************************************** [vcvarsall.bat] Environment initialized for: 'x64' F:\program\git\gn> ninja -C out [51/284] CXX src/gn/command_help.obj FAILED: src/gn/command_help.obj ninja -t msvc -- cl.exe /nologo /showIncludes /FC -I..\src -I. /O2 /DNDEBUG /Zc:inline /DNOMINMAX /DUNICODE /DWIN32_LEAN_AND_MEAN /DWINVER=0x0A00 /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_UNICODE /D_WIN32_WINNT=0x0A00 /FS /W4 /WX /Zi /wd4099 /wd4100 /wd4127 /wd4244 /wd4267 /wd4505 /wd4838 /wd4996 /std:c++17 /GR- /D_HAS_EXCEPTIONS=0 /c ..\src\gn\command_help.cc /Fosrc/gn/command_help.obj f:\program\git\gn\src\gn\escape.h: error C2220: warning treated as error - no 'object' file generated f:\program\git\gn\src\gn\escape.h: warning C4819: The file contains a character that cannot be represented in the current code page (936). Save the file in Unicode format to prevent data loss

解決方法
修改gn/build/gen.py 第525行：
修改前

'/wd4244','/wd4267','/wd4505','/wd4838','/wd4996','/std:c++17','/GR-','/D_HAS_EXCEPTIONS=0',])

添加一個’/wd4819’,

'/wd4244','/wd4267','/wd4505','/wd4838','/wd4819','/wd4996','/std:c++17','/GR-','/D_HAS_EXCEPTIONS=0',])

之后刪除 out/src 文件，重新ninja -C out ，成功

總結

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