Enable LTO (Link Time Optimization) in platform-specific mozconfig files

configs/common/mozconfig

@@ -53,11 +53,6 @@ if test "$ZEN_RELEASE"; then
   # Done by vlad, if something fails, it's his fault
   ac_add_options --disable-default-browser-agent
 
-  if ! test "$ZEN_DISABLE_LTO"; then
-    export MOZ_LTO=cross,thin
-    ac_add_options --enable-lto=cross,thin
-  fi
-
   ac_add_options --enable-jemalloc
 
   mk_add_options MOZILLA_OFFICIAL=1

configs/linux/mozconfig

@@ -18,6 +18,11 @@ if test "$SURFER_COMPAT" = "x86_64"; then
     # Optimization flags for SURFER_COMPAT
     ac_add_options --enable-optimize="-O3 -march=x86-64"
 
+    if ! test "$ZEN_DISABLE_LTO"; then
+      export MOZ_LTO=cross,thin
+      ac_add_options --enable-lto=cross,thin
+    fi
+
     export CFLAGS="$CFLAGS -O3 -ffp-contract=fast -march=x86-64"
     export CPPFLAGS="$CPPFLAGS -O3 -ffp-contract=fast -march=x86-64"
     export CXXFLAGS="$CXXFLAGS -O3 -flto=thin -ffp-contract=fast -march=x86-64"
@@ -28,6 +33,11 @@ elif test "$SURFER_COMPAT" = "aarch64"; then
 
     ac_add_options --enable-optimize="-O3"
 
+    if ! test "$ZEN_DISABLE_LTO"; then
+      export MOZ_LTO=cross,thin
+      ac_add_options --enable-lto=cross,thin
+    fi
+
     export CFLAGS="$CFLAGS -O3"
     export CPPFLAGS="$CPPFLAGS -O3"
     export CXXFLAGS="$CXXFLAGS -O3"

configs/macos/mozconfig

@@ -11,6 +11,11 @@ ac_add_options MOZ_PGO=1
 
 ac_add_options --enable-clang-plugin
 
+if ! test "$ZEN_DISABLE_LTO"; then
+  export MOZ_LTO=cross,thin
+  ac_add_options --enable-lto=cross,thin
+fi
+
 if test "$SURFER_COMPAT" = "x86_64"; then
     ac_add_options --target=x86_64-apple-darwin
 

configs/windows/mozconfig

@@ -25,6 +25,11 @@ fi
 ac_add_options --disable-maintenance-service
 ac_add_options --disable-bits-download
 
+if ! test "$ZEN_DISABLE_LTO"; then
+  export MOZ_LTO=cross,thin
+  ac_add_options --enable-lto=cross,thin
+fi
+
 if test "$SURFER_COMPAT" = "x86_64"; then
   ac_add_options --target=x86_64-pc-windows-msvc
   ac_add_options --enable-eme=widevine