make: Add pgo-build target

Makefile

@@ -5,10 +5,11 @@ VERSION = 1.5
 PREFIX ?= /usr/local
 MANPREFIX ?= ${PREFIX}/share/man
 CFLAGS += -DVERSION=\"${VERSION}\"
+PGO_GEN = ${CFLAGS} -fprofile-generate
+PGO_USE = ${CFLAGS} -fprofile-use -fprofile-correction
 LDFLAGS ?=
 CC ?= cc
 SRC = smu.c
-OBJ = smu.o
 
 all: smu
 
@@ -18,15 +19,30 @@ options:
 	@echo "LDFLAGS  = ${LDFLAGS}"
 	@echo "CC       = ${CC}"
 
-.c.o:
+smu: ${SRC}
-	@echo CC $<
+	@echo CC $@
-	@${CC} -c ${CFLAGS} $<
+	@${CC} -o $@ ${SRC} ${CFLAGS} ${LDFLAGS}
 
-${OBJ}: ${SRC}
+pgo-build: ${SRC}
+	@echo CC smu
+	@${CC} -o smu ${SRC} ${PGO_GEN} ${LDFLAGS}
+	@echo Generating pgo data
+	@printf .
+	@./smu testdoc > /dev/null
+	@printf .
+	@cat testdoc | ./smu > /dev/null
+	@printf .
+	@./smu -n testdoc > /dev/null
+	@printf .
+	@cat testdoc | ./smu -n > /dev/null
+	@printf .
+	@rm smu
+	@printf '\n'
+	@echo Recompiling with pgo data
+	@echo CC smu
+	@${CC} -o smu ${SRC} ${PGO_USE} ${LDFLAGS}
+	@rm smu.gcda
 
-smu: ${OBJ}
-	@echo LD $@
-	@${CC} -o $@ ${OBJ} ${LDFLAGS}
 
 clean:
 	rm -f smu ${OBJ} ${LIBOBJ} smu-${VERSION}.tar.gz
@@ -50,4 +66,4 @@ uninstall:
 	rm -f ${DESTDIR}${PREFIX}/bin/smu
 	rm -f ${DESTDIR}${MANPREFIX}/man1/smu.1
 
-.PHONY: all options clean dist install uninstall
+.PHONY: all options clean dist install uninstall pgo-build