PKGBUILDs/alarm/kodi-rpi-git/0001-ffmpeg-build-with-lto-when-DUSE_LTO-ON.patch

From e32ddfda63944ef786b3a3ddea243dc0ed2f4c11 Mon Sep 17 00:00:00 2001
From: graysky <graysky@archlinux.us>
Date: Fri, 7 Jan 2022 10:22:22 -0500
Subject: [PATCH] ffmpeg: build with lto when -DUSE_LTO=ON

I do not believe the internal ffmpeg build uses LTO if the user calls for it
via -DUSE_LTO=ON.  This commit passes --enable-lto to ffmpeg's configure script
if CMAKE has CMAKE_INTERPROCEDURAL_OPTIMIZATION set which -DUSE_LTO=ON does.

The original author of this, loqs, points this out here[1].

1. https://bugs.archlinux.org/task/69333#comment196255
---
 cmake/modules/FindFFMPEG.cmake             | 5 +++++
 tools/depends/target/ffmpeg/CMakeLists.txt | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/cmake/modules/FindFFMPEG.cmake b/cmake/modules/FindFFMPEG.cmake
index 13c810591b..5f0c596cb7 100644
--- a/cmake/modules/FindFFMPEG.cmake
+++ b/cmake/modules/FindFFMPEG.cmake
@@ -55,6 +55,11 @@ macro(buildFFMPEG)
                    -DOS=${OS}
                    -DCMAKE_AR=${CMAKE_AR})
   endif()
+
+  if(USE_LTO)
+    list(APPEND FFMPEG_OPTIONS -DUSE_LTO=ON)
+  endif()
+
   set(LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS})
   list(APPEND LINKER_FLAGS ${SYSTEM_LDFLAGS})
 
diff --git a/tools/depends/target/ffmpeg/CMakeLists.txt b/tools/depends/target/ffmpeg/CMakeLists.txt
index 1bf9f53499..d438449888 100644
--- a/tools/depends/target/ffmpeg/CMakeLists.txt
+++ b/tools/depends/target/ffmpeg/CMakeLists.txt
@@ -126,6 +126,10 @@ if(CPU MATCHES x86 OR CPU MATCHES x86_64)
   list(APPEND ffmpeg_conf --x86asmexe=${NASM_EXECUTABLE})
 endif()
 
+if(USE_LTO)
+   list(APPEND ffmpeg_conf --enable-lto)
+endif()
+
 if(ENABLE_DAV1D)
   list(APPEND ffmpeg_conf --enable-libdav1d)
   set(pkgconf_path "PKG_CONFIG_PATH=${PKG_CONFIG_PATH}")
-- 
2.44.0