Check if CMake TLS is working
| cmake_minimum_required(VERSION 3.19) | |
| function(check_tls) | |
| # some CMake may not have SSL/TLS enabled, or may have missing/broken system certificates. | |
| # this is a publicly-usable service (as per their TOS) | |
| set(url https://www.howsmyssl.com/a/check) | |
| set(temp ${PROJECT_BINARY_DIR}/check_tls.json) | |
| if(NOT EXISTS ${temp}) | |
| message(STATUS "CheckTLS: ${url} => ${temp}") | |
| file(DOWNLOAD ${url} ${temp} INACTIVITY_TIMEOUT 5) | |
| endif() | |
| file(READ ${temp} json) | |
| string(JSON rating ERROR_VARIABLE e GET ${json} rating) | |
| message(VERBOSE "TLS status: ${rating}") | |
| if(NOT rating STREQUAL "Probably Okay") | |
| message(WARNING "TLS seems to be broken on your system. Downloads will probably fail. ${rating}") | |
| endif() | |
| endfunction(check_tls) |
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