From 185e2f009bbffff9bfa2f4d633ddbea777ab111b Mon Sep 17 00:00:00 2001
From: Michael Ford <fanquake@gmail.com>
Date: Sun, 5 Mar 2023 23:58:22 +0800
Subject: build: improve mbedtls searching on macOS with brew for cmake (#1419)

This just copies the same logic used to find OpenSSL on macOS using homebrew, for finding mbedtls via brew. Without it, the build will fail out the box with a brew installed mbedtls.
---
 CMakeLists.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 18bab88a..721eb9b4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -955,6 +955,20 @@ if (NOT EVENT__DISABLE_OPENSSL)
 endif()
 
 if (NOT EVENT__DISABLE_MBEDTLS)
+    # only if MBEDTLS_ROOT_DIR is not set yet
+    if (BREW AND NOT MBEDTLS_ROOT_DIR AND NOT "$ENV{MBEDTLS_ROOT_DIR}")
+        execute_process(COMMAND ${BREW} --prefix mbedtls
+            OUTPUT_VARIABLE BREW_MBEDTLS_PREFIX
+            RESULT_VARIABLE BREW_MBEDTLS_RESULT
+            ERROR_QUIET
+            OUTPUT_STRIP_TRAILING_WHITESPACE
+        )
+        if (BREW_MBEDTLS_RESULT EQUAL 0)
+            message(STATUS "Set MBEDTLS_ROOT_DIR=${BREW_MBEDTLS_PREFIX} (from brew)")
+            set(MBEDTLS_ROOT_DIR "${BREW_MBEDTLS_PREFIX}" CACHE PATH "")
+        endif()
+    endif()
+
     find_package(MbedTLS REQUIRED)
 
     set(EVENT__HAVE_MBEDTLS 1)
-- 
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