From 3df3f2e2e99697b07d71cc14a65137dbb147ae9e Mon Sep 17 00:00:00 2001
From: Michael Gregorius <michael.gregorius.git@arcor.de>
Date: Mon, 11 Sep 2023 18:49:56 +0200
Subject: [PATCH] Fix MacOS build (from PR-6758)

Cherry-pick some changes from PR #6758 to keep MacOS building.
---
 CMakeLists.txt                          | 28 +++++++++++++++++++++++--
 plugins/LadspaEffect/swh/CMakeLists.txt |  3 ++-
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e20f1352701..ef35cd5e921 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,21 @@ SET(LMMS_BINARY_DIR ${CMAKE_BINARY_DIR})
 SET(LMMS_SOURCE_DIR ${CMAKE_SOURCE_DIR})
 
 # CMAKE_POLICY Section
+IF(COMMAND CMAKE_POLICY)
+	CMAKE_POLICY(SET CMP0005 NEW)
+	CMAKE_POLICY(SET CMP0003 NEW)
+	IF (CMAKE_MAJOR_VERSION GREATER 2)
+		CMAKE_POLICY(SET CMP0026 NEW)
+		CMAKE_POLICY(SET CMP0045 NEW)
+		CMAKE_POLICY(SET CMP0050 OLD)
+	ENDIF()
+	CMAKE_POLICY(SET CMP0020 NEW)
+	CMAKE_POLICY(SET CMP0057 NEW)
+	# TODO: Keep CMP0074 but remove this condition when cmake 3.12+ is guaranteed
+	IF(${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.12)
+		CMAKE_POLICY(SET CMP0074 NEW) # find_package() uses <PackageName>_ROOT variables
+	ENDIF()
+ENDIF(COMMAND CMAKE_POLICY)
 
 # Import of windows.h breaks min()/max()
 ADD_DEFINITIONS(-DNOMINMAX)
@@ -262,8 +277,17 @@ ELSE(WANT_CMT)
 ENDIF(WANT_CMT)
 
 IF(WANT_SWH)
-	SET(LMMS_HAVE_SWH TRUE)
-	SET(STATUS_SWH "OK")
+	IF(LMMS_BUILD_APPLE)
+		# Prefer system perl over Homebrew, MacPorts, etc
+		SET(Perl_ROOT "/usr/bin")
+	ENDIF()
+	FIND_PACKAGE(Perl)
+	IF(PERL_FOUND)
+		SET(LMMS_HAVE_SWH TRUE)
+		SET(STATUS_SWH "OK")
+	ELSE()
+		SET(STATUS_SWH "Skipping, perl is missing")
+	ENDIF()
 ELSE(WANT_SWH)
 	SET(STATUS_SWH "not built as requested")
 ENDIF(WANT_SWH)
diff --git a/plugins/LadspaEffect/swh/CMakeLists.txt b/plugins/LadspaEffect/swh/CMakeLists.txt
index ece3070060b..a8300117735 100644
--- a/plugins/LadspaEffect/swh/CMakeLists.txt
+++ b/plugins/LadspaEffect/swh/CMakeLists.txt
@@ -16,6 +16,7 @@ SET(COMPILE_FLAGS "${COMPILE_FLAGS} ${PIC_FLAGS}")
 # Loop over every XML file
 FILE(GLOB XML_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/ladspa/*.xml")
 LIST(SORT XML_SOURCES)
+
 FOREACH(_item ${XML_SOURCES})
 	# Get library name and (soon to be) C file
 	GET_FILENAME_COMPONENT(_plugin "${_item}" NAME_WE)
@@ -24,7 +25,7 @@ FOREACH(_item ${XML_SOURCES})
 	# Coerce XML source file to C
 	ADD_CUSTOM_COMMAND(
 		OUTPUT "${_out_file}"
-		COMMAND perl ./makestub.pl "${_item}" > "${_out_file}"
+		COMMAND "${PERL_EXECUTABLE}" ./makestub.pl "${_item}" > "${_out_file}"
 		DEPENDS "${_item}"
 		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/ladspa"
 		VERBATIM