WIP: Test MinGW and FFmpeg LTO

.github/scripts/build.sh

@@ -49,6 +49,9 @@ fi
 
 if [[ "$PLATFORM" =~ (mingw|cygwin) ]]; then
     .github/scripts/toolchain/build-mingw-crt.sh
+    if [[ "$MINGW_LTO" = 1 ]]; then
+        LTO=1 .github/scripts/toolchain/build-mingw-crt.sh
+    fi
 fi
 if [[ "$PLATFORM" =~ mingw ]]; then
     .github/scripts/toolchain/build-mingw-winpthreads.sh
@@ -75,6 +78,9 @@ fi
 
 if [[ "$PLATFORM" =~ (mingw|cygwin) ]]; then
     .github/scripts/toolchain/build-mingw.sh
+    if [[ "$MINGW_LTO" = 1 ]]; then
+        LTO=1 .github/scripts/toolchain/build-mingw.sh
+    fi
 fi
 if [[ "$PLATFORM" =~ cygwin ]]; then
     .github/scripts/toolchain/build-cygwin.sh 2

.github/scripts/config.sh

@@ -36,6 +36,10 @@ if [[ ("$PLATFORM" =~ (mingw|cygwin) && ! ("$CRT" =~ (msvcrt|ucrt))) ||
     exit 1
 fi
 
+if [[ "$TOOLCHAIN_NAME" = aarch64-w64-mingw32-msvcrt ]]; then
+    MINGW_LTO=${MINGW_LTO:-1}
+fi
+
 SOURCE_PATH=${SOURCE_PATH:-$PWD/code}
 DOWNLOADS_PATH=${DOWNLOADS_PATH:-$PWD/downloads}
 PATCHES_PATH=${PATCHES_PATH:-$PWD/patches}

.github/scripts/ffmpeg/build.sh

@@ -17,7 +17,19 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$FFMPEG_BUILD_PATH/Makefile" ]]; then
                 --enable-debug=3"
         fi
 
-        CFLAGS="-Wno-incompatible-pointer-types -fno-builtin-sin -fno-builtin-cos" \
+        CFLAGS="-Wno-incompatible-pointer-types -fno-builtin-sin -fno-builtin-cos"
+
+        if [[ "$LTO" = 1 ]]; then
+            CFLAGS=" \
+                $CFLAGS \
+                -fno-builtin"
+            HOST_OPTIONS=" \
+                $HOST_OPTIONS \
+                --enable-lto"
+
+        fi
+
+        CFLAGS=$CFLAGS \
         $FFMPEG_SOURCE_PATH/configure \
             --prefix=$FFMPEG_PATH \
             --target-path="." \

.github/scripts/toolchain/build-gcc-stage1.sh

@@ -46,6 +46,7 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$GCC_BUILD_PATH/Makefile" ]]; then
             *mingw*)
                 TARGET_OPTIONS="$TARGET_OPTIONS \
                     --enable-languages=c \
+                    --enable-lto \
                     --disable-isl-version-check \
                     --disable-rpath \
                     --disable-win32-registry \
@@ -64,7 +65,6 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$GCC_BUILD_PATH/Makefile" ]]; then
         --disable-shared \
         --disable-bootstrap \
         --disable-multilib \
-        --disable-plugins \
         --disable-gcov \
         --disable-libatomic \
         --disable-libgomp \
@@ -91,6 +91,13 @@ if [[ "$RUN_INSTALL" = 1 ]]; then
             rm -rf $GCC_BUILD_PATH
         fi
     echo "::endgroup::"
+
+   lto_plugin_path=$(find $TOOLCHAIN_PATH/libexec/gcc/$TARGET -type f -name liblto_plugin.so | head -n 1)
+    if [ -n $lto_plugin_path ]; then
+        echo "::group::Install LTO plug-in"
+            ln -sf $lto_plugin_path $TOOLCHAIN_PATH/lib/bfd-plugins/liblto_plugin.so
+        echo "::endgroup::"
+    fi
 fi
 
 echo 'Success!'

.github/scripts/toolchain/build-gcc.sh

@@ -124,6 +124,13 @@ if [[ "$RUN_INSTALL" = 1 ]]; then
             rm -rf $GCC_BUILD_PATH
         fi
     echo "::endgroup::"
+
+   lto_plugin_path=$(find $TOOLCHAIN_PATH/lib/gcc/$TARGET -type f -name liblto_plugin.so | head -n 1)
+    if [ -n $lto_plugin_path ]; then
+        echo "::group::Install LTO plug-in"
+            ln -sf $lto_plugin_path $TOOLCHAIN_PATH/lib/bfd-plugins/liblto_plugin.so
+        echo "::endgroup::"
+    fi
 fi
 
 echo 'Success!'

.github/scripts/toolchain/build-mingw-crt.sh

@@ -2,7 +2,13 @@
 
 source `dirname ${BASH_SOURCE[0]}`/../config.sh
 
-MINGW_BUILD_PATH=$BUILD_PATH/mingw-crt
+if [[ "$LTO" = 1 ]]; then
+    MINGW_BUILD_PATH=$BUILD_PATH/mingw-crt-lto
+    INSTALL_PATH=$TOOLCHAIN_PATH/$TARGET/lto
+else
+    MINGW_BUILD_PATH=$BUILD_PATH/mingw-crt
+    INSTALL_PATH=$TOOLCHAIN_PATH/$TARGET
+fi
 
 mkdir -p $MINGW_BUILD_PATH
 cd $MINGW_BUILD_PATH
@@ -16,6 +22,12 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$MINGW_BUILD_PATH/Makefile" ]]; then
                 --enable-debug"
         fi
 
+        if [ "$LTO" = 1 ] ; then
+            CFLAGS="$CFLAGS \
+                -flto \
+                -fno-builtin"
+        fi
+
         case "$ARCH" in
             x86_64)
                 TARGET_OPTIONS="$TARGET_OPTIONS \
@@ -39,12 +51,12 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$MINGW_BUILD_PATH/Makefile" ]]; then
             *cygwin*)
                 TARGET_OPTIONS="$TARGET_OPTIONS \
                     --enable-w32api"
-                ;;
+            ;;
             *mingw*)
                 TARGET_OPTIONS="$TARGET_OPTIONS \
                     --enable-wildcard \
                     --disable-dependency-tracking"
-                ;;
+            ;;
         esac
 
         case "$CRT" in
@@ -59,7 +71,7 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$MINGW_BUILD_PATH/Makefile" ]]; then
         esac
 
         $SOURCE_PATH/$MINGW_VERSION/mingw-w64-crt/configure \
-            --prefix=$TOOLCHAIN_PATH/$TARGET \
+            --prefix=$INSTALL_PATH \
             --build=$BUILD \
             --host=$TARGET \
             $HOST_OPTIONS \

.github/scripts/toolchain/build-mingw.sh

@@ -2,7 +2,13 @@
 
 source `dirname ${BASH_SOURCE[0]}`/../config.sh
 
-MINGW_BUILD_PATH=$BUILD_PATH/mingw
+if [[ "$LTO" = 1 ]]; then
+    MINGW_BUILD_PATH=$BUILD_PATH/mingw-lto
+    INSTALL_PATH=$TOOLCHAIN_PATH/$TARGET/lto
+else
+    MINGW_BUILD_PATH=$BUILD_PATH/mingw
+    INSTALL_PATH=$TOOLCHAIN_PATH/$TARGET
+fi
 
 mkdir -p $MINGW_BUILD_PATH
 cd $MINGW_BUILD_PATH
@@ -16,6 +22,12 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$MINGW_BUILD_PATH/Makefile" ]]; then
                 --enable-debug"
         fi
 
+        if [[ "$LTO" = 1 ]]; then
+            CFLAGS="$CFLAGS \
+                -flto \
+                -fno-builtin"
+        fi
+
         case "$ARCH" in
             x86_64)
                 TARGET_OPTIONS="$TARGET_OPTIONS \
@@ -39,12 +51,12 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$MINGW_BUILD_PATH/Makefile" ]]; then
             *cygwin*)
                 TARGET_OPTIONS="$TARGET_OPTIONS \
                     --enable-w32api"
-                ;;
+            ;;
             *mingw*)
                 TARGET_OPTIONS="$TARGET_OPTIONS \
                     --enable-wildcard \
                     --disable-dependency-tracking"
-                ;;
+            ;;
         esac
 
         case "$CRT" in
@@ -59,7 +71,7 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$MINGW_BUILD_PATH/Makefile" ]]; then
         esac
 
         $SOURCE_PATH/$MINGW_VERSION/configure \
-            --prefix=$TOOLCHAIN_PATH/$TARGET \
+            --prefix=$INSTALL_PATH \
             --build=$BUILD \
             --host=$TARGET \
             $HOST_OPTIONS \