Makefile: Add optimization flags

Signed-off-by: KenHV <[email protected]>

Makefile

@@ -439,13 +439,13 @@ endif
 HOSTPKG_CONFIG	= pkg-config
 
 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
-			 -O2 -fomit-frame-pointer -std=gnu11 \
+			 -O3 -fomit-frame-pointer -std=gnu11 \
 			 -Wdeclaration-after-statement -pipe
 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 
 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
-KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
+KBUILD_HOSTCXXFLAGS := -Wall -O3 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 
@@ -754,11 +754,29 @@ KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
 KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
-KBUILD_CFLAGS += -O2
+KBUILD_AFLAGS	+= -O2
+KBUILD_CFLAGS	+= -O2
+ifdef CONFIG_CC_IS_CLANG
+ifdef CONFIG_LTO
+KBUILD_LDFLAGS	+= --lto-O2
+else
+KBUILD_LDFLAGS	+= -O2
+endif
+endif
 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
-KBUILD_CFLAGS += -O3
+KBUILD_AFLAGS	+= -O3
+KBUILD_CFLAGS	+= -O3
+ifdef CONFIG_CC_IS_CLANG
+ifdef CONFIG_LTO
+KBUILD_LDFLAGS	+= --lto-O3
+else
+KBUILD_LDFLAGS	+= -O3
+endif
+endif
 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS += -Os
+KBUILD_AFLAGS	+= -Os
+KBUILD_CFLAGS	+= -Os
+KBUILD_LDFLAGS	+= -Os
 endif
 
 # Tell gcc to never replace conditional load with a non-conditional one