Cmake Portable Download Proxy -

The most reliable method to ensure all CMake operations (like file(DOWNLOAD) , FetchContent , and ExternalProject_Add ) use your proxy is to set these variables in your shell before running CMake.

set(ENV{HTTP_PROXY} "http://example.com") set(ENV{HTTPS_PROXY} "http://example.com") Use code with caution. Including passwords in plain text is a security risk. 3. Proxy for Specific Commands ExternalProject: CMake ignores proxy settings on Windows cmake download proxy

While you can set environment variables inside your script using set(ENV{...}) , this often fails for certain operations like ExternalProject_Add because they may run in a separate process that doesn't inherit these internal script changes. The most reliable method to ensure all CMake

export http_proxy=http://example.com export https_proxy=http://example.com export no_proxy="localhost,127.0.0.1,.local" Use code with caution. $env:HTTP_PROXY = "http://example

$env:HTTP_PROXY = "http://example.com" $env:HTTPS_PROXY = "http://example.com" Use code with caution. 2. Setting Proxies within CMakeLists.txt

If you must set it in code, do so at the very top of your CMakeLists.txt :