$OpenBSD: patch-Makefile,v 1.1.1.1 2011/08/19 06:44:00 jasper Exp $

- Allow ${CC} and ${OPT} to be overriden, to help packagers.
  http://code.google.com/p/leveldb/issues/detail?id=32

- Provide a shared library
  http://code.google.com/p/leveldb/issues/detail?id=27

--- Makefile.orig	Fri Aug  5 22:40:49 2011
+++ Makefile	Thu Aug 18 17:18:19 2011
@@ -2,13 +2,15 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-CC = g++
+CC ?= g++
 
+SONAME_MAJOR?=0
+SONAME_MINOR?=0
 #-----------------------------------------------
 # Uncomment exactly one of the lines labelled (A), (B), and (C) below
 # to switch between compilation modes.
 
-OPT = -O2 -DNDEBUG       # (A) Production use (optimized mode)
+OPT ?= -O2 -DNDEBUG       # (A) Production use (optimized mode)
 # OPT = -g2              # (B) Debug mode, w/ full line-level debugging symbols
 # OPT = -O2 -g2 -DNDEBUG # (C) Profiling mode: opt, but w/debugging symbols
 #-----------------------------------------------
@@ -36,7 +38,7 @@ else
 GOOGLE_PERFTOOLS_LDFLAGS=
 endif
 
-CFLAGS = -c -I. -I./include $(PORT_CFLAGS) $(PLATFORM_CFLAGS) $(OPT) $(SNAPPY_CFLAGS)
+CFLAGS += -c -I. -I./include $(PORT_CFLAGS) $(PLATFORM_CFLAGS) $(OPT) $(SNAPPY_CFLAGS) -fPIC
 
 LDFLAGS=$(PLATFORM_LDFLAGS) $(SNAPPY_LDFLAGS) $(GOOGLE_PERFTOOLS_LDFLAGS)
 
@@ -102,20 +104,28 @@ PROGRAMS = db_bench $(TESTS)
 BENCHMARKS = db_bench_sqlite3 db_bench_tree_db
 
 LIBRARY = libleveldb.a
+SHARED_LIBRARY = libleveldb.so
 
-all: $(LIBRARY)
+all: $(LIBRARY) $(SHARED_LIBRARY)
 
 check: $(PROGRAMS) $(TESTS)
 	for t in $(TESTS); do echo "***** Running $$t"; ./$$t || exit 1; done
 
 clean:
 	-rm -f $(PROGRAMS) $(BENCHMARKS) $(LIBRARY) */*.o */*/*.o ios-x86/*/*.o ios-arm/*/*.o
+	-rm -f $(SHARED_LIBRARY).* $(SHARED_LIBRARY)
 	-rm -rf ios-x86/* ios-arm/*
 	-rm build_config.mk
 
 $(LIBRARY): $(LIBOBJECTS)
 	rm -f $@
 	$(AR) -rs $@ $(LIBOBJECTS)
+
+$(SHARED_LIBRARY): $(LIBOBJECTS)
+	rm -f $@
+	$(CC) -shared -Wl,-soname -Wl,$@.$(SONAME_MAJOR) $(LIBOBJECTS) $(LDFLAGS) -o $@.$(SONAME_MAJOR).$(SONAME_MINOR)
+	ln -s $@.$(SONAME_MAJOR).$(SONAME_MINOR) $@.$(SONAME_MAJOR)
+	ln -s $@.$(SONAME_MAJOR).$(SONAME_MINOR) $@
 
 db_bench: db/db_bench.o $(LIBOBJECTS) $(TESTUTIL)
 	$(CC) $(LDFLAGS) db/db_bench.o $(LIBOBJECTS) $(TESTUTIL) -o $@