From 73f40d8a2385543464d79d4461ab68eb56783d26 Mon Sep 17 00:00:00 2001
From: Solomon Peachy <pizza@shaftnet.org>
Date: Sun, 2 Jul 2023 20:43:01 -0400
Subject: build:  Experimental LTO support, phase one

 * Only codecs and plugins are enabled
 * Only native builds (so far)
 * Only tested on xDuoo X3 (MIPS, monochrome)
 * opus & speex generate some warnings
 * Significant compile time impact

Change-Id: I519b0d179631a54b2103cd67225bd5ec6ad3bd2f
---
 apps/plugins/plugins.make | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'apps/plugins/plugins.make')

diff --git a/apps/plugins/plugins.make b/apps/plugins/plugins.make
index b430bd2792..4a126f812c 100644
--- a/apps/plugins/plugins.make
+++ b/apps/plugins/plugins.make
@@ -37,6 +37,12 @@ PLUGINLIB_OBJ := $(PLUGINLIB_SRC:.c=.o)
 PLUGINLIB_OBJ := $(PLUGINLIB_OBJ:.S=.o)
 PLUGINLIB_OBJ := $(call full_path_subst,$(ROOTDIR)/%,$(BUILDDIR)/%,$(PLUGINLIB_OBJ))
 
+ifdef USE_LTO
+# We do NOT want LTO on the GCC support file.
+$(BUILDDIR)/apps/plugins/lib/gcc-support.o: PLUGINFLAGS += -fno-lto
+$(BUILDDIR)/apps/plugins/plugin_crt0.o: PLUGINFLAGS += -fno-lto
+endif
+
 ### build data / rules
 ifndef APP_TYPE
 CONFIGFILE := $(FIRMDIR)/export/config/$(MODELNAME).h
@@ -147,6 +153,12 @@ else
 endif
 PLUGINLDFLAGS += $(GLOBAL_LDOPTS)
 
+ifdef USE_LTO
+ PLUGINFLAGS += -flto -fno-builtin -ffreestanding
+ PLUGINLDFLAGS += -flto -fno-builtin -ffreestanding
+ PLUGINLDFLAGS += -e plugin_start
+endif
+
 $(BUILDDIR)/%.rock:
 	$(call PRINTS,LD $(@F))$(CC) $(PLUGINFLAGS) -o $(BUILDDIR)/$*.elf \
 		$(filter %.o, $^) \
-- 
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