@Neur2n 还不至于复杂到需要文档的地步吧
目前位于 Readme 的介绍就是完整的功能介绍了，可以配置的选项都写在了表格内

@Neur2n udphop 并非一定要 VPS ，我自己就没把 udphop 放在 VPS 上，而是放在路由器（服务端模式）和自己的电脑（客户端模式）

@lly8666 前几天更新了静态链接版本，可以再试试

@pagxir
@ec0

好了，这下搞清楚原因在哪了，确实是 GCC 的锅。
我在 Debian 测试版运行了一次 apt upgrade ，把所有能够更新的都更新一遍，其中就包括 GCC 。我记得应该有两个月没更新过了。

升级完成后，原本 GCC 10 会失败的命令
c++ aes.cpp -I./include/botan-2 -lstdc++ -L:./lib/ -lbotan-2 -static
在最新版 GCC 12.2.0-9 一次性成功

至于是什么 bug 就懒得查了。我只能说，GCC 真不是省油的灯。

Debian 10 、11 、最新的测试版，试了我很多次，都是一堆 undefined reference ，心累

@pagxir 首先可以肯定的是，botan 库在编译的时候已经附带 index 的选项，这是 Botan 自己生成的 makefile 开头：
CXX = g++
LINKER = $(CXX)
AR = ar
AR_OPTIONS = crs
PYTHON_EXE = /usr/bin/python3


为了简单起见，就以我给 Botan 作者贴出的 aes.cpp 做编译。

第一次，用 Debian 自带软件包管理器安装出来的 Botan：
c++ -lbotan-2 -I/usr/include/botan-2 -lstdc++ -lpthread aes.cpp
c++ -I/usr/include/botan-2 -lbotan-2 -lstdc++ -lpthread aes.cpp
c++ -I/usr/include/botan-2 -lstdc++ -lbotan-2 -lpthread aes.cpp
c++ -I/usr/include/botan-2 -lstdc++ -lpthread -lbotan-2 aes.cpp

c++ -static -lbotan-2 -I/usr/include/botan-2 -lstdc++ -lpthread aes.cpp
c++ -static -I/usr/include/botan-2 -lbotan-2 -lstdc++ -lpthread aes.cpp
c++ -static -I/usr/include/botan-2 -lstdc++ -lbotan-2 -lpthread aes.cpp
c++ -static -I/usr/include/botan-2 -lstdc++ -lpthread -lbotan-2 aes.cpp
c++ -static -I/usr/include/botan-2 -lstdc++ -lpthread aes.cpp -lbotan-2

以上命令全部失败，undefined reference 一堆。唯一成功的就是作者给出的命令
c++ -I/usr/include/botan-2 -lstdc++ -lpthread aes.cpp -lbotan-2
这样会编译出动态库版本，而不是静态库版本。

接着用我下载 Botan 源码手动编译的版本：
c++ -L:./lib/libbotan-2.a -I./include/botan-2 -lstdc++ -lpthread aes.cpp
c++ -I./include/botan-2 -L:./lib/libbotan-2.a -lstdc++ -lpthread aes.cpp
c++ -I./include/botan-2 -lstdc++ -L:./lib/libbotan-2.a -lpthread aes.cpp
c++ -I./include/botan-2 -lstdc++ -lpthread aes.cpp -L:./lib/libbotan-2.a

c++ -static -L:./lib/libbotan-2.a -I./include/botan-2 -lstdc++ -lpthread aes.cpp
c++ -static -I./include/botan-2 -L:./lib/libbotan-2.a -lstdc++ -lpthread aes.cpp
c++ -static -I./include/botan-2 -lstdc++ -L:./lib/libbotan-2.a -lpthread aes.cpp
c++ -static -I./include/botan-2 -lstdc++ -lpthread aes.cpp -L:./lib/libbotan-2.a

以上命令依旧全部失败，仍然还是 undefined reference 一大堆。

GCC 的版本：
$ c++ --version
c++ (Debian 10.2.1-6) 10.2.1 20210110
Copyright (C) 2020 Free Software Foundation, Inc.

上面那个好像失效了，再放一个：
https://temp.sh/CAfSj/botan2.19.3.log

@lixile Log 太长，放在临时网盘了：
https://file.io/SSNkzdCvnASo

@zoumouse 就以我给 Botan 提 issue 时的测试代码为例
https://github.com/randombit/botan/issues/3085

即使加了 -static ，还是一样报错。

@changnet 十分奇怪的是，我自己编译 Botan 源码自己链接，还是不行（ Debian 11 和 Debian 最新测试版），但 alpine 用户可以。我按照 alpine 用户给出的经验操作去试，报错信息依然爆了一堆。

而同样都是 .a 静态编译，clang 工具链一下子就完成了，非常顺畅； VS 解决起来相对也是好一点，vcpkg 同样可以指定编译成动态库还是静态库，我是两种库都备好，这样就可以根据自己的设置选择正确的版本，选对了基本都能编译成功。

目前 clang 唯一不足的是对于 C++新标准的完善度相对较落后，其他方面我觉得比 GNU 好得多

/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `Botan::secure_allocator<unsigned char>::allocate(unsigned long)':
share_defines.cpp:(.text._ZN5Botan16secure_allocatorIhE8allocateEm[_ZN5Botan16secure_allocatorIhE8allocateEm]+0x1d): undefined reference to `Botan::allocate_memory(unsigned long, unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `Botan::secure_allocator<unsigned long>::deallocate(unsigned long*, unsigned long)':
share_defines.cpp:(.text._ZN5Botan16secure_allocatorImE10deallocateEPmm[_ZN5Botan16secure_allocatorImE10deallocateEPmm]+0x28): undefined reference to `Botan::deallocate_memory(void*, unsigned long, unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_384E[_ZTVN5Botan9SHA_3_384E]+0x28): undefined reference to `Botan::SHA_3::add_data(unsigned char const*, unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_384E[_ZTVN5Botan9SHA_3_384E]+0x30): undefined reference to `Botan::SHA_3::final_result(unsigned char*)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_384E[_ZTVN5Botan9SHA_3_384E]+0x38): undefined reference to `Botan::SHA_3::clone() const'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_384E[_ZTVN5Botan9SHA_3_384E]+0x40): undefined reference to `Botan::SHA_3::provider[abi:cxx11]() const'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_384E[_ZTVN5Botan9SHA_3_384E]+0x48): undefined reference to `Botan::SHA_3::clear()'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_384E[_ZTVN5Botan9SHA_3_384E]+0x50): undefined reference to `Botan::SHA_3::name[abi:cxx11]() const'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_384E[_ZTVN5Botan9SHA_3_384E]+0x60): undefined reference to `Botan::SHA_3::copy_state() const'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_256E[_ZTVN5Botan9SHA_3_256E]+0x28): undefined reference to `Botan::SHA_3::add_data(unsigned char const*, unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_256E[_ZTVN5Botan9SHA_3_256E]+0x30): undefined reference to `Botan::SHA_3::final_result(unsigned char*)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_256E[_ZTVN5Botan9SHA_3_256E]+0x38): undefined reference to `Botan::SHA_3::clone() const'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_256E[_ZTVN5Botan9SHA_3_256E]+0x40): undefined reference to `Botan::SHA_3::provider[abi:cxx11]() const'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_256E[_ZTVN5Botan9SHA_3_256E]+0x48): undefined reference to `Botan::SHA_3::clear()'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_256E[_ZTVN5Botan9SHA_3_256E]+0x50): undefined reference to `Botan::SHA_3::name[abi:cxx11]() const'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTVN5Botan9SHA_3_256E[_ZTVN5Botan9SHA_3_256E]+0x60): undefined reference to `Botan::SHA_3::copy_state() const'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTIN5Botan9SHA_3_384E[_ZTIN5Botan9SHA_3_384E]+0x10): undefined reference to `typeinfo for Botan::SHA_3'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o):(.data.rel.ro._ZTIN5Botan9SHA_3_256E[_ZTIN5Botan9SHA_3_256E]+0x10): undefined reference to `typeinfo for Botan::SHA_3'
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/udphop.dir/build.make:100: udphop] Error 1
make[2]: Leaving directory '/home/USERNAME/udphop/build'
make[1]: *** [CMakeFiles/Makefile2:134: CMakeFiles/udphop.dir/all] Error 2
make[1]: Leaving directory '/home/USERNAME/udphop/build'
make: *** [Makefile:91: all] Error 2

[100%] Linking CXX executable udphop
/usr/bin/cmake -E cmake_link_script CMakeFiles/udphop.dir/link.txt --verbose=1
/usr/bin/c++ CMakeFiles/udphop.dir/src/main.cpp.o -o udphop -lstdc++ -lbotan-2 src/shares/libSHAREDEFINES.a src/networks/libNETCONNECTIONS.a src/shares/libSHAREDEFINES.a
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): warning: relocation against `_ZTVN5Botan5SHA_3E' in read-only section `.text._ZN5Botan5SHA_3D2Ev[_ZN5Botan5SHA_3D5Ev]'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `Botan::SHA_3::~SHA_3()':
share_defines.cpp:(.text._ZN5Botan5SHA_3D2Ev[_ZN5Botan5SHA_3D5Ev]+0xf): undefined reference to `vtable for Botan::SHA_3'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `Botan::SHA_3_256::SHA_3_256()':
share_defines.cpp:(.text._ZN5Botan9SHA_3_256C2Ev[_ZN5Botan9SHA_3_256C5Ev]+0x19): undefined reference to `Botan::SHA_3::SHA_3(unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `Botan::SHA_3_384::SHA_3_384()':
share_defines.cpp:(.text._ZN5Botan9SHA_3_384C2Ev[_ZN5Botan9SHA_3_384C5Ev]+0x19): undefined reference to `Botan::SHA_3::SHA_3(unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `aes_256_gcm::set_key(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
share_defines.cpp:(.text._ZN11aes_256_gcm7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN11aes_256_gcm7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x1f0): undefined reference to `Botan::AEAD_Mode::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Botan::Cipher_Dir, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: share_defines.cpp:(.text._ZN11aes_256_gcm7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN11aes_256_gcm7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x2c6): undefined reference to `Botan::AEAD_Mode::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Botan::Cipher_Dir, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: share_defines.cpp:(.text._ZN11aes_256_gcm7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN11aes_256_gcm7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x372): undefined reference to `Botan::SymmetricAlgorithm::set_key(unsigned char const*, unsigned long)'
/usr/bin/ld: share_defines.cpp:(.text._ZN11aes_256_gcm7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN11aes_256_gcm7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x410): undefined reference to `Botan::SymmetricAlgorithm::set_key(unsigned char const*, unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `aes_256_ocb::set_key(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
share_defines.cpp:(.text._ZN11aes_256_ocb7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN11aes_256_ocb7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x342): undefined reference to `Botan::AEAD_Mode::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Botan::Cipher_Dir, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: share_defines.cpp:(.text._ZN11aes_256_ocb7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN11aes_256_ocb7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x418): undefined reference to `Botan::AEAD_Mode::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Botan::Cipher_Dir, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: share_defines.cpp:(.text._ZN11aes_256_ocb7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN11aes_256_ocb7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x4c4): undefined reference to `Botan::SymmetricAlgorithm::set_key(unsigned char const*, unsigned long)'
/usr/bin/ld: share_defines.cpp:(.text._ZN11aes_256_ocb7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN11aes_256_ocb7set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x562): undefined reference to `Botan::SymmetricAlgorithm::set_key(unsigned char const*, unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `chacha20::set_key(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
share_defines.cpp:(.text._ZN8chacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN8chacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x2f6): undefined reference to `Botan::AEAD_Mode::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Botan::Cipher_Dir, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: share_defines.cpp:(.text._ZN8chacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN8chacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x3cc): undefined reference to `Botan::AEAD_Mode::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Botan::Cipher_Dir, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: share_defines.cpp:(.text._ZN8chacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN8chacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x478): undefined reference to `Botan::SymmetricAlgorithm::set_key(unsigned char const*, unsigned long)'
/usr/bin/ld: share_defines.cpp:(.text._ZN8chacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN8chacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x516): undefined reference to `Botan::SymmetricAlgorithm::set_key(unsigned char const*, unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `xchacha20::set_key(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
share_defines.cpp:(.text._ZN9xchacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN9xchacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x23c): undefined reference to `Botan::AEAD_Mode::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Botan::Cipher_Dir, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: share_defines.cpp:(.text._ZN9xchacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN9xchacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x312): undefined reference to `Botan::AEAD_Mode::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Botan::Cipher_Dir, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/bin/ld: share_defines.cpp:(.text._ZN9xchacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN9xchacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x3be): undefined reference to `Botan::SymmetricAlgorithm::set_key(unsigned char const*, unsigned long)'
/usr/bin/ld: share_defines.cpp:(.text._ZN9xchacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN9xchacha207set_keyERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x45c): undefined reference to `Botan::SymmetricAlgorithm::set_key(unsigned char const*, unsigned long)'
/usr/bin/ld: src/shares/libSHAREDEFINES.a(share_defines.cpp.o): in function `Botan::secure_allocator<unsigned char>::deallocate(unsigned char*, unsigned long)':
share_defines.cpp:(.text._ZN5Botan16secure_allocatorIhE10deallocateEPhm[_ZN5Botan16secure_allocatorIhE10deallocateEPhm]+0x28): undefined reference to `Botan::deallocate_memory(void*, unsigned long, unsigned long)'

@lixile 由于 Log 太长，这里删掉了
/usr/include/botan-2/botan/sha3.h:15:13: warning: this header will be made internal in the future
15 | BOTAN_FUTURE_INTERNAL_HEADER(sha3.h)
| ^~~~~~~~~~~~~~~~~~~~~~~~
这样的警告，其他的都保留

$ make VERBOSE=1
/usr/bin/cmake -S/home/USERNAME/udphop -B/home/USERNAME/udphop/build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/USERNAME/udphop/build/CMakeFiles /home/USERNAME/udphop/build//CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
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cd /home/USERNAME/udphop/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/USERNAME/udphop /home/USERNAME/udphop/src/shares /home/USERNAME/udphop/build /home/USERNAME/udphop/build/src/shares /home/USERNAME/udphop/build/src/shares/CMakeFiles/SHAREDEFINES.dir/DependInfo.cmake --color=
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[ 11%] Building CXX object src/shares/CMakeFiles/SHAREDEFINES.dir/share_defines.cpp.o
cd /home/USERNAME/udphop/build/src/shares && /usr/bin/c++ -I/usr/include/botan-2 -std=c++17 -MD -MT src/shares/CMakeFiles/SHAREDEFINES.dir/share_defines.cpp.o -MF CMakeFiles/SHAREDEFINES.dir/share_defines.cpp.o.d -o CMakeFiles/SHAREDEFINES.dir/share_defines.cpp.o -c /home/USERNAME/udphop/src/shares/share_defines.cpp
[ 22%] Linking CXX static library libSHAREDEFINES.a
cd /home/USERNAME/udphop/build/src/shares && /usr/bin/cmake -P CMakeFiles/SHAREDEFINES.dir/cmake_clean_target.cmake
cd /home/USERNAME/udphop/build/src/shares && /usr/bin/cmake -E cmake_link_script CMakeFiles/SHAREDEFINES.dir/link.txt --verbose=1
/usr/bin/ar qc libSHAREDEFINES.a CMakeFiles/SHAREDEFINES.dir/share_defines.cpp.o
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cd /home/USERNAME/udphop/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/USERNAME/udphop /home/USERNAME/udphop/src/networks /home/USERNAME/udphop/build /home/USERNAME/udphop/build/src/networks /home/USERNAME/udphop/build/src/networks/CMakeFiles/NETCONNECTIONS.dir/DependInfo.cmake --color=
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@zoumouse 作者是回避 libbotan.a 的链接问题，给出的命令可以运行成功，编译出来的程序是使用动态库的版本，等于没回答

@lixile 用当前工具链，自己编译出来的 libbotan.a 照样无法用于后续的静态链接，而且无论是 Linux 还是 NetBSD 都一样

@hsly109 针对最新 Debian 11 弄了个 2.17 的版本，应该够用的了。

原本我是打算全部以 static linking 的方式发布二进制的，奈何 Linux 版本的 Botan 只有动态库方式能用，静态库几乎反倒没法用。其他平台却可以正常用静态库。

我刚刚去看了下作者本人对开发环境的描述 ( https://botan.randombit.net/handbook/support.html )，Linux 是主力，然后是 Windows ，剩下的都靠 Github 自动化工具。既然 Linux 是作者的主力平台，使用起来却最“拉跨”，实在费解。

对于未定义行为就没必要去纠结了，这种情况下编译器想怎么干都行，甚至直接让整个程序崩溃都不奇怪

可以查阅 C++标准，1 楼给出的那段文字，位于 ISO IEC 14882 2020-12 的 PDF 的第 126 页。

国内有转载：
https://bbs.pediy.com/thread-267401-1.htm

@lly8666 保险起见，我还是再另外弄了个专门用于 botan 2.9 的版本，以防万一

@huangjinjiang20 是的