From f14d9e6efc9dc82725d0547f2dd77fc29192ecbd Mon Sep 17 00:00:00 2001
From: Viktor Szakats <commit@vsz.me>
Date: Sat, 28 Mar 2026 23:23:31 +0100
Subject: [PATCH] cmake: enable pthreads for BoringSSL/AWS-LC

Depends on 6828df7d2116fe680a0d012b06a4501e26efa99b #21176

Closes #21168
---
 CMake/curl-config.in.cmake |  2 +-
 CMakeLists.txt             | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/CMake/curl-config.in.cmake b/CMake/curl-config.in.cmake
index c6e4341f7b..317477197f 100644
--- a/CMake/curl-config.in.cmake
+++ b/CMake/curl-config.in.cmake
@@ -35,7 +35,7 @@ endif()
 
 include(CMakeFindDependencyMacro)
 
-if("@HAVE_THREADS_POSIX@")
+if("@HAVE_THREADS_POSIX@" OR "@HAVE_THREADS_POSIX_BORINGSSL@")
   find_dependency(Threads)  # for Threads::Threads
 endif()
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 60014108ce..76af84e795 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -847,6 +847,16 @@ if(CURL_USE_OPENSSL)
   cmake_pop_check_state()
 
   if(HAVE_BORINGSSL OR HAVE_AWSLC)
+    if(NOT MSVC AND NOT ANDROID)  # BoringSSL/AWS-LC MSVC builds use native Windows threads
+      find_package(Threads)
+      if(CMAKE_USE_PTHREADS_INIT)
+        set(HAVE_THREADS_POSIX_BORINGSSL 1)
+        list(APPEND CURL_NETWORK_AND_TIME_LIBS Threads::Threads)
+        list(APPEND CMAKE_REQUIRED_LIBRARIES Threads::Threads)
+      elseif(OPENSSL_USE_STATIC_LIBS)
+        message(WARNING "BoringSSL/AWS-LC requires POSIX Threads.")
+      endif()
+    endif()
     if(OPENSSL_USE_STATIC_LIBS AND CMAKE_C_COMPILER_ID MATCHES "Clang")
       list(APPEND CURL_LIBS "stdc++")
       list(APPEND CMAKE_REQUIRED_LIBRARIES "stdc++")
@@ -2345,6 +2355,7 @@ if(NOT CURL_DISABLE_INSTALL)
   #   HAVE_LIBIDN2
   #   HAVE_LIBZ ZLIB_VERSION_MAJOR
   #   HAVE_THREADS_POSIX
+  #   HAVE_THREADS_POSIX_BORINGSSL
   #   HAVE_ZSTD
   #   USE_ARES
   #   USE_BACKTRACE