Set shared library soname in Linux.

Makefile

@@ -83,6 +83,7 @@ shared :
 ifeq ($(OSNAME), Linux)
 	$(MAKE) -C exports so
 	-ln -fs $(LIBSONAME) libopenblas.so
+	-ln -fs $(LIBSONAME) libopenblas.so.$(MAJOR_VERSION)
 endif
 ifeq ($(OSNAME), FreeBSD)
 	$(MAKE) -C exports so

Makefile.install

@@ -44,6 +44,7 @@ install : 	lib.grd
 ifeq ($(OSNAME), Linux)
 	-cp $(LIBSONAME) $(OPENBLAS_LIBRARY_DIR)
 	-ln -fs $(OPENBLAS_LIBRARY_DIR)/$(LIBSONAME) $(OPENBLAS_LIBRARY_DIR)/libopenblas.so
+	-ln -fs $(OPENBLAS_LIBRARY_DIR)/$(LIBSONAME) $(OPENBLAS_LIBRARY_DIR)/libopenblas.so.$(MAJOR_VERSION)
 endif
 ifeq ($(OSNAME), FreeBSD)
 	-cp $(LIBSONAME) $(OPENBLAS_LIBRARY_DIR)

Makefile.system

@@ -637,6 +637,7 @@ MD5SUM	= md5sum
 AWK	= awk
 
 REVISION = -r$(VERSION)
+MAJOR_VERSION = $(word 1,$(subst ., ,$(VERSION)))
 
 CFLAGS     = $(COMMON_OPT) $(CCOMMON_OPT) -I$(TOPDIR)
 PFLAGS     = $(COMMON_OPT) $(CCOMMON_OPT) -I$(TOPDIR) -DPROFILE $(COMMON_PROF)

exports/Makefile

@@ -100,7 +100,7 @@ so : ../$(LIBSONAME)
 ../$(LIBSONAME) : ../$(LIBNAME) linux.def linktest.c
 	$(CC) $(CFLAGS) -shared -o ../$(LIBSONAME) \
 	-Wl,--whole-archive ../$(LIBNAME) -Wl,--no-whole-archive \
-	-Wl,--retain-symbols-file=linux.def $(EXTRALIB)
+	-Wl,--retain-symbols-file=linux.def -Wl,-soname,libopenblas.so.$(MAJOR_VERSION) $(EXTRALIB)
 	$(CC) $(CFLAGS) -w -o linktest linktest.c ../$(LIBSONAME) $(FEXTRALIB) && echo OK.
 	rm -f linktest