问题
I'm using several libraries built through vcpkg (such as civet-web and prometheus-cpp), against my Visual C++ projects. When building x86 all is perfect, in x64 I get a bunch of linker errors:
error LNK2001: unresolved external symbol __CxxFrameHandler4
Searching online all references to this symbol/error are about specific projects, I cannot find what __CxxFrameHandler4 is and what problem this error is highlighting. I don't know if it's a problem with the way vcpkg is building the library, or a problem in my project or how to start looking for a solution.
I did find this blog article but it is in reference to a preview of VS2019, I cannot find any settings related to it: https://devblogs.microsoft.com/cppblog/making-cpp-exception-handling-smaller-x64/
If anyone can explain what this is all about it would be a big help.
回答1:
I faced the same issues when trying to install and use cpr with vcpkg. I wanted to use cpr library in a VS2015 project.
Reason: I had VS2019 installed. vcpkg uses latest version of toolset Visual Studio.
Resolution: Add your own triplet or change existing such a way that your specified toolset is used. Adding did not work in my case so I changed existing "triplet" files in triplet folder in vcpkg. I wanted vcpkg to use toolset that comes with VS2015 (It's V140)
Content of x86-windows.cmake file
set(VCPKG_TARGET_ARCHITECTURE x86)
set(VCPKG_CRT_LINKAGE dynamic)
set(VCPKG_LIBRARY_LINKAGE dynamic)
set(VCPKG_PLATFORM_TOOLSET "v140")
set(VCPKG_DEP_INFO_OVERRIDE_VARS "v140")
Content of x64-windows.cmake file
set(VCPKG_TARGET_ARCHITECTURE x64)
set(VCPKG_CRT_LINKAGE dynamic)
set(VCPKG_LIBRARY_LINKAGE dynamic)
set(VCPKG_PLATFORM_TOOLSET "v140")
set(VCPKG_DEP_INFO_OVERRIDE_VARS "v140")
来源：https://stackoverflow.com/questions/65672356/what-is-cxxframehandler4-and-what-does-linker-error-unresolved-external-symbo