From aeb396798f4583aec85169170da159290f35190f Mon Sep 17 00:00:00 2001
From: Paul Fertser <fercerpav@gmail.com>
Date: Mon, 18 Dec 2017 11:29:04 +0300
Subject: [PATCH 1/4] Add maximum debugging info to ELF; doesn't affect binary
 size

---
 examples/rules.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/rules.mk b/examples/rules.mk
index cd85001a..4f6a55dc 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -98,7 +98,7 @@ EXAMPLES_SCRIPT_DIR	= $(OPENCM3_DIR)/../scripts
 ###############################################################################
 # C flags
 
-TGT_CFLAGS	+= $(OPT) $(CSTD) -g
+TGT_CFLAGS	+= $(OPT) $(CSTD) -ggdb3
 TGT_CFLAGS	+= $(ARCH_FLAGS)
 TGT_CFLAGS	+= -Wextra -Wshadow -Wimplicit-function-declaration
 TGT_CFLAGS	+= -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
@@ -107,7 +107,7 @@ TGT_CFLAGS	+= -fno-common -ffunction-sections -fdata-sections
 ###############################################################################
 # C++ flags
 
-TGT_CXXFLAGS	+= $(OPT) $(CXXSTD) -g
+TGT_CXXFLAGS	+= $(OPT) $(CXXSTD) -ggdb3
 TGT_CXXFLAGS	+= $(ARCH_FLAGS)
 TGT_CXXFLAGS	+= -Wextra -Wshadow -Wredundant-decls  -Weffc++
 TGT_CXXFLAGS	+= -fno-common -ffunction-sections -fdata-sections

From 5751bb202add9aba2a8acaf3cc52cda709795b5b Mon Sep 17 00:00:00 2001
From: Paul Fertser <fercerpav@gmail.com>
Date: Mon, 18 Dec 2017 11:32:32 +0300
Subject: [PATCH 2/4] Disable RTTI and exceptions by default

---
 examples/rules.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/examples/rules.mk b/examples/rules.mk
index 4f6a55dc..ddbaeaf6 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -111,6 +111,7 @@ TGT_CXXFLAGS	+= $(OPT) $(CXXSTD) -ggdb3
 TGT_CXXFLAGS	+= $(ARCH_FLAGS)
 TGT_CXXFLAGS	+= -Wextra -Wshadow -Wredundant-decls  -Weffc++
 TGT_CXXFLAGS	+= -fno-common -ffunction-sections -fdata-sections
+TGT_CXXFLAGS	+= -fno-exceptions -fno-rtti
 
 ###############################################################################
 # C & C++ preprocessor common flags

From 403e22bc3da317b920a6471a0e03584c4f52f3c2 Mon Sep 17 00:00:00 2001
From: Paul Fertser <fercerpav@gmail.com>
Date: Mon, 18 Dec 2017 11:33:33 +0300
Subject: [PATCH 3/4] Add cross-reference to the map file

---
 examples/rules.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/rules.mk b/examples/rules.mk
index ddbaeaf6..9d5b62a2 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -126,7 +126,7 @@ TGT_CPPFLAGS	+= $(DEFS)
 TGT_LDFLAGS		+= --static -nostartfiles
 TGT_LDFLAGS		+= -T$(LDSCRIPT)
 TGT_LDFLAGS		+= $(ARCH_FLAGS)
-TGT_LDFLAGS		+= -Wl,-Map=$(*).map
+TGT_LDFLAGS		+= -Wl,-Map=$(*).map -Wl,--cref
 TGT_LDFLAGS		+= -Wl,--gc-sections
 ifeq ($(V),99)
 TGT_LDFLAGS		+= -Wl,--print-gc-sections

From 5fbd6ba151e6178ff7acc52f86484e4fad659e63 Mon Sep 17 00:00:00 2001
From: Paul Fertser <fercerpav@gmail.com>
Date: Mon, 18 Dec 2017 11:45:02 +0300
Subject: [PATCH 4/4] Optionally build with LTO

---
 examples/rules.mk | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/examples/rules.mk b/examples/rules.mk
index 9d5b62a2..6ffdb347 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -43,7 +43,11 @@ STYLECHECK	:= /checkpatch.pl
 STYLECHECKFLAGS	:= --no-tree -f --terse --mailback
 STYLECHECKFILES	:= $(shell find . -name '*.[ch]')
 OPT		:= -Os
+ifeq ($(LTO),1)
+OPT		+= -flto
+endif
 CSTD		?= -std=c99
+DEBUG		:= -ggdb3
 
 
 ###############################################################################
@@ -98,7 +102,7 @@ EXAMPLES_SCRIPT_DIR	= $(OPENCM3_DIR)/../scripts
 ###############################################################################
 # C flags
 
-TGT_CFLAGS	+= $(OPT) $(CSTD) -ggdb3
+TGT_CFLAGS	+= $(OPT) $(CSTD) $(DEBUG)
 TGT_CFLAGS	+= $(ARCH_FLAGS)
 TGT_CFLAGS	+= -Wextra -Wshadow -Wimplicit-function-declaration
 TGT_CFLAGS	+= -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
@@ -107,7 +111,7 @@ TGT_CFLAGS	+= -fno-common -ffunction-sections -fdata-sections
 ###############################################################################
 # C++ flags
 
-TGT_CXXFLAGS	+= $(OPT) $(CXXSTD) -ggdb3
+TGT_CXXFLAGS	+= $(OPT) $(CXXSTD) $(DEBUG)
 TGT_CXXFLAGS	+= $(ARCH_FLAGS)
 TGT_CXXFLAGS	+= -Wextra -Wshadow -Wredundant-decls  -Weffc++
 TGT_CXXFLAGS	+= -fno-common -ffunction-sections -fdata-sections
@@ -125,7 +129,7 @@ TGT_CPPFLAGS	+= $(DEFS)
 
 TGT_LDFLAGS		+= --static -nostartfiles
 TGT_LDFLAGS		+= -T$(LDSCRIPT)
-TGT_LDFLAGS		+= $(ARCH_FLAGS)
+TGT_LDFLAGS		+= $(ARCH_FLAGS) $(DEBUG)
 TGT_LDFLAGS		+= -Wl,-Map=$(*).map -Wl,--cref
 TGT_LDFLAGS		+= -Wl,--gc-sections
 ifeq ($(V),99)
@@ -194,7 +198,7 @@ print-%:
 
 %.elf %.map: $(OBJS) $(LDSCRIPT)
 	@#printf "  LD      $(*).elf\n"
-	$(Q)$(LD) $(TGT_LDFLAGS) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $(*).elf
+	$(Q)$(LD) $(OPT) $(TGT_LDFLAGS) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $(*).elf
 
 %.o: %.c
 	@#printf "  CC      $(*).c\n"