From d778af2a3bc0bebdff0ceb31f7948882ea707107 Mon Sep 17 00:00:00 2001
From: Travis Cross <tc@traviscross.com>
Date: Sat, 5 Apr 2014 22:04:31 +0000
Subject: [PATCH] Add soname to chibi shared library

Including a soname with a public shared library is a good practice and
is required by the policy of many distributions such as Debian.  The
major version of the soname distinguishes incompatible versions of the
shared library.
---
 .hgignore     |  1 +
 Makefile      | 18 +++++++++++++++---
 Makefile.libs |  2 ++
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/.hgignore b/.hgignore
index 33dc000d..cd3c0af6 100644
--- a/.hgignore
+++ b/.hgignore
@@ -4,6 +4,7 @@ syntax: glob
 *.s
 *.o
 *.so
+*.so.*
 *.pc
 *.sch
 *.sps
diff --git a/Makefile b/Makefile
index 52021680..a793fca7 100644
--- a/Makefile
+++ b/Makefile
@@ -4,6 +4,8 @@
 .DEFAULT_GOAL := all
 
 VERSION ?= $(shell cat VERSION)
+SOVERSION ?= $(shell echo "$(VERSION)" | sed "s/^\(\(\.\?[0-9]\+\)*\).*$$/\1/")
+SOVERSION_MAJOR ?= $(shell echo "$(SOVERSION)" | sed "s/\..*//")
 
 CHIBI_FFI ?= $(CHIBI) -q tools/chibi-ffi
 CHIBI_FFI_DEPENDENCIES ?= $(CHIBI_DEPENDENCIES) tools/chibi-ffi
@@ -98,8 +100,14 @@ EVAL_OBJS = opcodes.o vm.o eval.o simplify.o
 libchibi-sexp$(SO): $(SEXP_OBJS)
 	$(CC) $(CLIBFLAGS) $(CLINKFLAGS) -o $@ $^ $(XLDFLAGS)
 
-libchibi-scheme$(SO): $(SEXP_OBJS) $(EVAL_OBJS)
-	$(CC) $(CLIBFLAGS) $(CLINKFLAGS) -o $@ $^ $(XLDFLAGS)
+libchibi-scheme$(SO).$(SOVERSION): $(SEXP_OBJS) $(EVAL_OBJS)
+	$(CC) $(CLIBFLAGS) $(CLINKFLAGS) -Wl,-soname,libchibi-scheme$(SO).$(SOVERSION_MAJOR) -o $@ $^ $(XLDFLAGS)
+
+libchibi-scheme$(SO).$(SOVERSION_MAJOR): libchibi-scheme$(SO).$(SOVERSION)
+	$(LN) -sf $< $@
+
+libchibi-scheme$(SO): libchibi-scheme$(SO).$(SOVERSION_MAJOR)
+	$(LN) -sf $< $@
 
 libchibi-scheme.a: $(SEXP_OBJS) $(EVAL_OBJS)
 	$(AR) rcs $@ $^
@@ -317,7 +325,9 @@ install: all
 	$(INSTALL) -m0644 $(INCLUDES) $(DESTDIR)$(INCDIR)/
 	$(MKDIR) $(DESTDIR)$(LIBDIR)
 	$(MKDIR) $(DESTDIR)$(SOLIBDIR)
-	$(INSTALL) -m0644 libchibi-scheme$(SO) $(DESTDIR)$(SOLIBDIR)/
+	$(INSTALL) -m0644 libchibi-scheme$(SO).$(SOVERSION) $(DESTDIR)$(SOLIBDIR)/
+	$(CP) -d libchibi-scheme$(SO).$(SOVERSION_MAJOR) $(DESTDIR)$(SOLIBDIR)/
+	$(CP) -d libchibi-scheme$(SO) $(DESTDIR)$(SOLIBDIR)/
 	-$(INSTALL) -m0644 libchibi-scheme.a $(DESTDIR)$(SOLIBDIR)/
 	$(MKDIR) $(DESTDIR)$(SOLIBDIR)/pkgconfig
 	$(INSTALL) -m0644 chibi-scheme.pc $(DESTDIR)$(SOLIBDIR)/pkgconfig/
@@ -333,6 +343,8 @@ uninstall:
 	-$(RM) $(DESTDIR)$(BINDIR)/chibi-ffi
 	-$(RM) $(DESTDIR)$(BINDIR)/chibi-doc
 	-$(RM) $(DESTDIR)$(SOLIBDIR)/libchibi-scheme$(SO)
+	-$(RM) $(DESTDIR)$(SOLIBDIR)/libchibi-scheme$(SO).$(SOVERSION)
+	-$(RM) $(DESTDIR)$(SOLIBDIR)/libchibi-scheme$(SO).$(SOVERSION_MAJOR)
 	-$(RM) $(DESTDIR)$(LIBDIR)/libchibi-scheme$(SO).a
 	-$(RM) $(DESTDIR)$(SOLIBDIR)/pkgconfig/chibi-scheme.pc
 	-$(CD) $(DESTDIR)$(INCDIR) && $(RM) $(INCLUDES)
diff --git a/Makefile.libs b/Makefile.libs
index 02599184..ae566a8a 100644
--- a/Makefile.libs
+++ b/Makefile.libs
@@ -13,6 +13,8 @@ AR        ?= ar
 CD        ?= cd
 RM        ?= rm -f
 LS        ?= ls
+CP        ?= cp
+LN        ?= ln
 INSTALL   ?= install
 MKDIR     ?= $(INSTALL) -d
 RMDIR     ?= rmdir