1 files changed, 37 insertions, 0 deletions
diff --git a/ZZ-lto.sh.in b/ZZ-lto.sh.in
new file mode 100644
index 000000000000..01cc1d0d8cbf
--- /dev/null
+++ b/ZZ-lto.sh.in
@@ -0,0 +1,37 @@
+#!/usr/bin/bash
+#
+#   ZZ-lto.sh - Compile with link-time optimization
+#
+
+[[ -n "$LIBMAKEPKG_BUILDENV_LTO_SH" ]] && return
+LIBMAKEPKG_BUILDENV_LTO_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/option.sh"
+
+build_options+=('lto' 'lto-thin')
+buildenv_functions+=('buildenv_lto')
+
+buildenv_lto() {
+  if check_buildoption "lto" "y" || check_buildoption "lto-thin" "y" && \
+  [[ -f "$(gcc -print-search-dirs | grep install | awk '{print $2 "liblto_plugin.so"}')" ]]; then
+    [[ "$CC" == "clang" || "$CXX" == "clang++" ]] && \
+      ltoflags=" -flto" || \
+      ltoflags=" -flto=$(getconf _NPROCESSORS_ONLN) -flto-partition=none -fno-fat-lto-objects"
+
+    if check_buildoption "lto-thin" "y"; then
+      [[ "$CC" == "clang" || "$CXX" == "clang++" ]] && \
+        ltoflags="${ltoflags// -flto/ -flto=thin}" || \
+        ltoflags="${ltoflags// -flto-partition=none / }"
+    fi
+
+    CFLAGS+="$ltoflags"
+    CXXFLAGS+="$ltoflags"
+    LDFLAGS+=" -fuse-linker-plugin $CFLAGS $CXXFLAGS"
+    ltoplugin="$(gcc -print-search-dirs | grep install | awk '{print $2 "liblto_plugin.so"}')"
+    ARFLAGS+=" --plugin $ltoplugin"
+    RANLIBFLAGS+=" --plugin $ltoplugin"
+    NMFLAGS+=" --plugin $ltoplugin"
+  fi
+}