前言
最近用着Windows+VSCode进行跨平台开发，vcpkg下载好OpenSSL生成的时候CMake就找不到了
CMakeLists.txt
# SSL
find_package(OpenSSL REQUIRED)
target_link_directories(${
PROJECT_NAME} PRIVATE ${
OPENSSL_CRYPTO_LIBRARY})
target_include_directories(${
PROJECT_NAME} PRIVATE ${
OPENSSL_INCLUDE_DIR})
target_link_libraries(${
PROJECT_NAME} PRIVATE OpenSSL::SSL OpenSSL::Crypto)
日志提示
CMake Error at E:/cmake/share/cmake-3.25/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
[cmake] Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the
[cmake] system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY
[cmake] OPENSSL_INCLUDE_DIR)
检查安装
PS C:\Users\NueXini> vcpkg list
openssl:x64-windows 3.0.5#4 OpenSSL is an open source project that provides ...
vcpkg-cmake-config:x64-windows 2022-02-06#1
vcpkg-cmake-get-vars:x64-windows 2022-05-10#1
vcpkg-cmake:x64-windows 2022-07-18
确保vcpkg已经把openssl下载并安装了，然后在 CMakeLists.txt 中添加手动设置一下路径
set(CMAKE_TOOLCHAIN_FILE E:/vcpkg/scripts/buildsystems/vcpkg.cmake)
set(OPENSSL_ROOT_DIR E:/vcpkg/installed/x64-windows)
find_package(OpenSSL REQUIRED)
target_link_directories(${
PROJECT_NAME} PRIVATE ${
OPENSSL_CRYPTO_LIBRARY})
target_include_directories(${
PROJECT_NAME} PRIVATE ${
OPENSSL_INCLUDE_DIR})
target_link_libraries(${
PROJECT_NAME} PRIVATE OpenSSL::SSL OpenSSL::Crypto)
设置Vcpkg环境变量
建议设置VCPKG_ROOT的环境变量，这样就不需要在单独写环境了
下面是VCPKG其他可选的环境变量，可以根据自己需求来设置
Options:
--triplet=<t> Specify the target architecture triplet. See 'vcpkg help triplet'.
(default: 'VCPKG_DEFAULT_TRIPLET')
--host-triplet=<t> Specify the host architecture triplet. See 'vcpkg help triplet'.
(default: 'VCPKG_DEFAULT_HOST_TRIPLET')
--overlay-ports=<path> Specify directories to be used when searching for ports.
(also: 'VCPKG_OVERLAY_PORTS')
--overlay-triplets=<path> Specifiy directories containing triplets files.
(also: 'VCPKG_OVERLAY_TRIPLETS')
--binarysource=<path> Add sources for binary caching. See 'vcpkg help binarycaching'.
--x-asset-sources=<path> Add sources for asset caching. See 'vcpkg help assetcaching'.
--downloads-root=<path> Specify the downloads root directory.
(default: VCPKG_DOWNLOADS)
--vcpkg-root=<path> Specify the vcpkg root directory.
(default: 'VCPKG_ROOT')
VSCode手动设置
打开VSCode的设置，找到cmake.buildEnvironment，手动添加环境变量
引用
在代码中只需要 include 进去就好
#include <openssl/ssl.h>
其他方法
下载完把包解压，设置环境变量，或者手动设置目录也可以，有些库对openssl有要求，选择对应版本下载
像cpp-httplib只兼容opensslde 1.1.1 或者 3.0.0