CMake Build scripts and MSVC support

[Ryex]

This PR adds CMake build scripts that mostly mirror the existing autotools build system.

It also contains some patches to support building under MSVC which was the reason the CMake build system was necessary.

This PR is initially marked as Draft because the build scripts could use some polishing. additionally they need testing across multiple systems and configurations to really validate their correctness.

For now I've tested them under Linux and windows 11 in a VM

[kc991229]

Hello, I built using cmake in Visual Studio, but unfortunately, it did not compile properly. The following error appears to be missing cx11_ Override.cc file:
CMakeLists. txt: 130 (try_compile): CMake Error:
The source directory "cx11_override.cc" does not exist

[Ryex]

Hello, I built using cmake in Visual Studio, but unfortunately, it did not compile properly. The following error appears to be missing cx11_ Override.cc file: CMakeLists. txt: 130 (try_compile): CMake Error: The source directory "cx11_override.cc" does not exist

this appears to be a problem with your cmake install or your file permissions. the relevant lines in the cmake list

message(STATUS "Checking whether the C++ compiler supports `override` keyword")
set(_tmp_src
  "\
struct Base {
virtual void f() = 0;
};
struct Derived : Base {
virtual void f() override {}
};
int main(int argc, char* argv[]) {
  Derived x;
}
")
try_compile(CXX11_OVERRIDE
  SOURCE_FROM_VAR cx11_override.cc _tmp_src
)
unset(_tmp_src)

writes the file cx11_override.cc and tries to compile it to check the override keyword support.

you can pass --debug-trycompile to cmake to debug why that is failing

[zjq609177738]

Windows10 LSTC2019 : libgnutls libxml2 ...等几个依赖库 怎么配置 才能成功编译?
我使用cmake-gui 程序 构建项目时 ,总是在依赖库上出现问题,例如
CMake Error at cmake/FindCPPUNIT.cmake:52 (file):
file STRINGS file
"C:/Users/Administrator/Desktop/aria2-msvc-build/cppunit/include/cppunit/config-auto.h"
cannot be read.
还有这个
CMake Error at cmake/FindCPPUNIT.cmake:53 (string):
string sub-command REGEX, mode REPLACE needs at least 6 arguments total to
command.
.......
是我从github下载的依赖库不正确吗?
能否给个完整过程的cmake教程?

[ckJust]

[zjq609177738]

 cmake生成sln的目录有个 config.h 你需要修改它 我只在win使用  ,我自己选择的依赖库为libssh2,libcares,libexpat,zlib,sqlite3(这个就2文件我就直接添加到项目里了,没有使用静态lib或者dll) 所以 我在config.h末尾添加以下内容即可构建成功 #define HAVE_LIBSSH2 1 #define HAVE_LIBCARES 1 #define HAVE_SQLITE3 1 #define HAVE_LIBEXPAT 1 #define HAVE_ZLIB 1 #define ENABLE_SSL 1 #define HAVE_WINTLS 1 #define SECURITY_WIN32 1 #pragma comment(lib, "Crypt32.lib") #pragma comment(lib, "Secur32.lib")

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