From 3a087ad581f2e15451bfc12d8ad520422a92f4a8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C5=99emysl=20Eric=20Janouch?= <p@janouch.name>
Date: Sat, 23 Oct 2021 14:09:55 +0200
Subject: Remove unnecessary DLLs from Windows builds

This saves 20 MiB and 4 MiB of libraries in MSYS2 and bundle
builds respectively, in total, without any adverse effects.

The MSYS2 build remains bloated, due to the Adwaita icon theme.

Bump minimum CMake version to avoid a bug.
---
 Win32Cleanup.cmake | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Win32Cleanup.cmake

(limited to 'Win32Cleanup.cmake')

diff --git a/Win32Cleanup.cmake b/Win32Cleanup.cmake
new file mode 100644
index 0000000..be53ef8
--- /dev/null
+++ b/Win32Cleanup.cmake
@@ -0,0 +1,37 @@
+# To be run from cmake_install.cmake, eradicates all unreferenced libraries.
+# CMake 3.9.6 has a parsing bug with ENCODING UTF-8.
+cmake_minimum_required (VERSION 3.10)
+
+# CPack runs this almost without any CMake variables at all
+# (cmStateSnapshot::SetDefaultDefinitions(), CMAKE_INSTALL_PREFIX, [DESTDIR])
+set (installdir "${CMAKE_INSTALL_PREFIX}")
+if (NOT installdir OR installdir MATCHES "^/usr(/|$)")
+	return ()
+endif ()
+
+# The function is recursive and CMake has tragic scoping behaviour;
+# environment variables are truly global there, in the absence of a cache
+unset (ENV{seen})
+function (expand path)
+	set (seen $ENV{seen})
+	if (path IN_LIST seen OR NOT EXISTS "${path}")
+		return ()
+	endif ()
+
+	set (ENV{seen} "$ENV{seen};${path}")
+	file (STRINGS "${path}" strings REGEX "[.][Dd][Ll][Ll]$" ENCODING UTF-8)
+	foreach (string ${strings})
+		string (REGEX MATCH "[-.+_a-zA-Z0-9]+$" word "${string}")
+		expand ("${installdir}/${word}")
+	endforeach ()
+endfunction ()
+
+file (GLOB roots LIST_DIRECTORIES false "${installdir}/*.[Ee][Xx][Ee]"
+	"${installdir}/lib/gdk-pixbuf-2.0/2.10.0/loaders/*.[Dd][Ll][Ll]")
+foreach (binary ${roots})
+	expand ("${binary}")
+endforeach ()
+
+file (GLOB libraries LIST_DIRECTORIES false "${installdir}/*.[Dd][Ll][Ll]")
+list (REMOVE_ITEM libraries $ENV{seen})
+file (REMOVE ${libraries})
-- 
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