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How to Link to Openssl on Windows In Cmake?

4 minutes read

To link to OpenSSL on Windows in CMake, you first need to include the OpenSSL headers in your project, which can typically be found in the include directory of your OpenSSL installation. You can do this by adding the directory to your include_directories command in CMake.


Next, you need to link your project against the OpenSSL libraries. You can do this by using the target_link_libraries command in CMake, specifying the OpenSSL libraries that you want to link against. This typically includes libcrypto and libssl.


Additionally, you may need to set the path to the OpenSSL libraries using the CMAKE_PREFIX_PATH variable in CMake if they are not in the default search path.


Overall, linking to OpenSSL in CMake on Windows involves including the OpenSSL headers, linking against the OpenSSL libraries, and potentially setting the path to the OpenSSL libraries.


What is the ideal way to specify OpenSSL dependencies in CMake on Windows?

The ideal way to specify OpenSSL dependencies in CMake on Windows is to use the find_package command along with the OpenSSL module. Here is an example of how you can include OpenSSL in your CMakeLists.txt file:

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# Check for OpenSSL
find_package(OpenSSL REQUIRED)

# Check if OpenSSL was found
if(OPENSSL_FOUND)
    message(STATUS "OpenSSL found: ${OPENSSL_INCLUDE_DIR}")
else()
    message(FATAL_ERROR "OpenSSL not found")
endif()

# Include OpenSSL headers
include_directories(${OPENSSL_INCLUDE_DIR})

# Link OpenSSL libraries
target_link_libraries(your_target_name ${OPENSSL_LIBRARIES})


Make sure to replace your_target_name with the name of your target executable or library. This approach ensures that CMake will search for and find the OpenSSL libraries and include directories on the system, making it easier to build your project with the necessary dependencies.


How to add OpenSSL flags to a CMake project on Windows?

To add OpenSSL flags to a CMake project on Windows, you will need to set the appropriate CMake variables to include the OpenSSL libraries and headers. Here is a step-by-step guide on how to do this:

  1. Install OpenSSL on your Windows system. You can download the OpenSSL binaries for Windows from the official OpenSSL website (https://www.openssl.org/).
  2. Set the OpenSSL installation directory as an environment variable. For example, you can set the environment variable OPENSSL_ROOT_DIR to the directory where OpenSSL is installed.
  3. In your CMake project, add the following lines to your CMakeLists.txt file to find the OpenSSL libraries and headers: 
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# Find OpenSSL
find_package(OpenSSL REQUIRED)
include_directories(${OPENSSL_INCLUDE_DIR})


  1. If you are using the OpenSSL library in your project, you can link against it by adding the following line to your CMakeLists.txt file:
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target_link_libraries(your_project ${OPENSSL_LIBRARIES})


  1. Run CMake to generate the build files for your project. Make sure that CMake can find the OpenSSL installation directory by setting the OPENSSL_ROOT_DIR variable or passing it as a command line argument.
  2. Build your project using your preferred build system, such as Visual Studio or Ninja.


By following these steps, you should be able to add OpenSSL flags to your CMake project on Windows and successfully use the OpenSSL libraries in your C++ code.


How to link to OpenSSL libraries in a CMake project on Windows?

To link to OpenSSL libraries in a CMake project on Windows, you can follow these steps:

  1. Make sure OpenSSL is installed on your system. You can download OpenSSL binaries for Windows from the official website: https://slproweb.com/products/Win32OpenSSL.html
  2. Set the path to the OpenSSL installation directory in CMake by adding the following lines to your CMakeLists.txt file: 
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set(OPENSSL_ROOT_DIR "C:/path/to/openssl")
set(OPENSSL_INCLUDE_DIR "${OPENSSL_ROOT_DIR}/include")
set(OPENSSL_LIBRARIES "${OPENSSL_ROOT_DIR}/lib/libcrypto.lib;${OPENSSL_ROOT_DIR}/lib/libssl.lib")


  1. Find the required OpenSSL libraries and include directories by using the following command in the OpenSSL installation directory:
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openssl version -a


  1. Add the following lines to your CMakeLists.txt file to find and link to the OpenSSL libraries:
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find_package(OpenSSL REQUIRED)
include_directories(${OPENSSL_INCLUDE_DIR})
target_link_libraries(your_target_name ${OPENSSL_LIBRARIES})


  1. Now you can build your CMake project, and it should link to the OpenSSL libraries correctly.


How to compile a CMake project with OpenSSL support on Windows?

To compile a CMake project with OpenSSL support on Windows, you will need to follow these steps:


Step 1: Download and install OpenSSL on your Windows machine. You can download the latest version of OpenSSL from the official website (https://www.openssl.org/).


Step 2: Set the required environment variables for OpenSSL. Open a Command Prompt window and run the following commands:


set OPENSSL_ROOT_DIR=C:\path\to\OpenSSL
set OPENSSL_INCLUDE_DIR=C:\path\to\OpenSSL\include set OPENSSL_LIBRARIES=C:\path\to\OpenSSL\lib


Replace "C:\path\to\OpenSSL" with the actual path to your OpenSSL installation directory.


Step 3: In your CMakeLists.txt file, you need to add the following lines to enable OpenSSL support:


find_package(OpenSSL REQUIRED) target_link_libraries(your_project_name OpenSSL::SSL OpenSSL::Crypto)


Make sure to replace "your_project_name" with the actual name of your CMake project.


Step 4: Generate the Visual Studio solution files using CMake. Run the following command in the Command Prompt:


cmake -G "Visual Studio 16 2019" -A x64 -DCMAKE_PREFIX_PATH="C:\path\to\OpenSSL" path\to\your\source\directory


Replace "Visual Studio 16 2019" with the appropriate Visual Studio version installed on your machine and "C:\path\to\OpenSSL" with the actual path to your OpenSSL installation directory. Also, replace "path\to\your\source\directory" with the actual path to your CMake project source directory.


Step 5: Open the generated Visual Studio solution files and build your project. OpenSSL support should now be enabled in your CMake project on Windows.

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