From 5f8134cfe5e7b90a8ce07d27ae737dcc54b523b3 Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Wed, 16 Oct 2019 20:09:13 +0200
Subject: [PATCH] CMakeLists.txt: fix static build with openssl

openssl can depends on -latomic so use pkg-config (if available) to
retrieve these static dependencies otherwise build will fail because
HMAC_CTX_new test will return a wrong result

Fixes:
 - http://autobuild.buildroot.org/results/65d0528b208c0a470264f7e2433be89425971dd7

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved (and backported) from:
https://github.com/warmcat/libwebsockets/commit/5f8134cfe5e7b90a8ce07d27ae737dcc54b523b3]
---
 CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2693ac56a..888f65e83 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1803,7 +1803,10 @@ if (LWS_WITH_SSL)
 		if (NOT OPENSSL_FOUND AND NOT LWS_WITH_BORINGSSL)
 			# TODO: Add support for STATIC also.
 		if (NOT LWS_WITH_ESP32)
+			find_package(PkgConfig QUIET)
+			pkg_check_modules(PC_OPENSSL openssl QUIET)
 			find_package(OpenSSL REQUIRED)
+			list(APPEND OPENSSL_LIBRARIES ${PC_OPENSSL_LIBRARIES})
 		endif()
 			set(OPENSSL_INCLUDE_DIRS "${OPENSSL_INCLUDE_DIR}")
 		endif()