From 4d581348943463cdb7297d05ed1fe0c1fcbd90c0 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Thu, 29 Sep 2016 18:36:14 +0200
Subject: [PATCH] Build and install a shared library.

---
 Makefile | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 075aca8..ee0ba10 100644
--- a/Makefile
+++ b/Makefile
@@ -1,29 +1,43 @@
 CXXFLAGS := -std=gnu++14 -O2 -Wall -I. -g $(shell pkg-config libusb-1.0 --cflags) -pthread
 LDFLAGS := $(shell pkg-config libusb-1.0 --libs) -pthread
 AR := ar
+LN := ln
 RANLIB := ranlib
 INSTALL := install
 PREFIX := /usr/local
 LIB := libbmusb.a
+SODEV := libbmusb.so
+SONAME := libbmusb.so.1
+SOLIB := libbmusb.so.1.0.0
 
-all: $(LIB) main
+all: $(LIB) $(SOLIB) main
+
+%.pic.o : %.cpp
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -fPIC -o $@ -c $^
 
 main: bmusb.o main.o
 	$(CXX) -o main $^ $(LDFLAGS)
 
+# Static library.
 $(LIB): bmusb.o fake_capture.o
 	$(AR) rc $@ $^
 	$(RANLIB) $@
 
+# Shared library.
+$(SOLIB): bmusb.pic.o fake_capture.pic.o
+	$(CXX) -shared -Wl,-soname,$(SONAME) -o $@ $^ $(LDFLAGS)
+
 clean:
-	$(RM) bmusb.o main.o fake_capture.o $(LIB) main
+	$(RM) bmusb.o main.o fake_capture.o bmusb.pic.o fake_capture.pic.o $(LIB) $(SOLIB) main
 
 install: all
 	$(INSTALL) -m 755 -o root -g root -d \
 		$(DESTDIR)$(PREFIX)/lib \
 		$(DESTDIR)$(PREFIX)/lib/pkgconfig \
 		$(DESTDIR)$(PREFIX)/include/bmusb
-	$(INSTALL) -m 755 -o root -g root $(LIB) $(DESTDIR)$(PREFIX)/lib
+	$(INSTALL) -m 755 -o root -g root $(LIB) $(SOLIB) $(DESTDIR)$(PREFIX)/lib
+	$(LN) -sf $(SOLIB) $(DESTDIR)$(PREFIX)/lib/$(SONAME)
+	$(LN) -sf $(SOLIB) $(DESTDIR)$(PREFIX)/lib/$(SODEV)
 	$(INSTALL) -m 755 -o root -g root bmusb/bmusb.h bmusb/fake_capture.h $(DESTDIR)$(PREFIX)/include/bmusb
 	$(INSTALL) -m 644 -o root -g root bmusb.pc $(DESTDIR)$(PREFIX)/lib/pkgconfig
 
-- 
2.39.2