BUILD: makefile: build halog with the correct flags

halog currently emits lots of warnings because it does not benefit from
the default flags. Let's update the main makefile to build it by itself
and remove the other one. The sub-project's makefile was replaced with
A readme indicating how to build it.

Makefile

@@ -926,8 +926,8 @@ objsize: haproxy
 %.o:	%.c $(DEP)
 	$(cmd_CC) $(COPTS) -c -o $@ $<
 
-admin/halog/halog:
-	$(Q)$(MAKE) -C admin/halog halog CC='$(cmd_CC)' OPTIMIZE='$(COPTS)'
+admin/halog/halog: admin/halog/halog.o admin/halog/fgets2.o src/ebtree.o src/eb32tree.o src/eb64tree.o src/ebmbtree.o src/ebsttree.o src/ebistree.o src/ebimtree.o
+	$(cmd_LD) $(LDFLAGS) -o $@ $^ $(LDOPTS)
 
 dev/flags/flags: dev/flags/flags.o
 	$(cmd_LD) $(LDFLAGS) -o $@ $^ $(LDOPTS)

admin/halog/Makefile

@@ -1,22 +0,0 @@
-INCLUDE  = -I../../include
-SRC      = ../../src
-
-CC       = gcc
-
-# note: it is recommended to also add -fomit-frame-pointer on i386
-OPTIMIZE = -O3
-
-# most recent glibc provide platform-specific optimizations that make
-# memchr faster than the generic C implementation (eg: SSE and prefetch
-# on x86_64). Try with an without. In general, on x86_64 it's better to
-# use memchr using the define below.
-# DEFINE   = -DUSE_MEMCHR
-DEFINE   =
-
-OBJS     = halog
-
-halog: halog.c fgets2.c
-	$(CC) $(OPTIMIZE) $(DEFINE) -o $@ $(INCLUDE) $(SRC)/ebtree.c $(SRC)/eb32tree.c $(SRC)/eb64tree.c $(SRC)/ebmbtree.c $(SRC)/ebsttree.c $(SRC)/ebistree.c $(SRC)/ebimtree.c $^
-
-clean:
-	rm -f $(OBJS) *.[oas]

admin/halog/README

@@ -0,0 +1,4 @@
+This needs to be built from the top makefile, for example :
+
+  make admin/halog/halog
+