From 7329ef76225d27fffec663aee1ad1113f30c5492 Mon Sep 17 00:00:00 2001
From: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Date: Mon, 14 Jan 2019 17:27:49 -0200
Subject: [PATCH] Enable LTO for libgfortran

---
 libgfortran/Makefile.am | 3 +++
 libgfortran/Makefile.in | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/libgfortran/Makefile.am b/libgfortran/Makefile.am
index 90fdef41097..b530319c400 100644
--- a/libgfortran/Makefile.am
+++ b/libgfortran/Makefile.am
@@ -79,6 +79,9 @@ AM_CFLAGS += $(SECTION_FLAGS)
 AM_CFLAGS += $(IEEE_FLAGS)
 AM_FCFLAGS += $(IEEE_FLAGS)
 
+AM_CFLAGS += -flto
+AM_FCFLAGS += -flto
+
 if LIBGFOR_MINIMAL
 AM_CFLAGS += -DLIBGFOR_MINIMAL
 endif
diff --git a/libgfortran/Makefile.in b/libgfortran/Makefile.in
index ef0f13271e3..2bde2169fa4 100644
--- a/libgfortran/Makefile.in
+++ b/libgfortran/Makefile.in
@@ -565,7 +565,7 @@ AMTAR = @AMTAR@
 
 # Some targets require additional compiler options for IEEE compatibility.
 AM_CFLAGS = @AM_CFLAGS@ -fcx-fortran-rules $(SECTION_FLAGS) \
-	$(IEEE_FLAGS) $(am__append_1)
+	$(IEEE_FLAGS) -flto $(am__append_1)
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AM_FCFLAGS = @AM_FCFLAGS@ $(IEEE_FLAGS)
 AR = @AR@
@@ -746,7 +746,7 @@ AM_CPPFLAGS = -iquote$(srcdir)/io -I$(srcdir)/$(MULTISRCTOP)../gcc \
 	      -I$(MULTIBUILDTOP)../libgcc \
 	      -I$(srcdir)/$(MULTISRCTOP)../libbacktrace \
 	      -I$(MULTIBUILDTOP)../libbacktrace \
-	      -I../libbacktrace
+	      -I../libbacktrace -flto
 
 gfor_io_src = io/size_from_kind.c $(am__append_2)
 gfor_io_headers = \
-- 
2.14.5