Patch #527027: Allow building python as shared library.

Makefile.pre.in

@@ -108,6 +108,9 @@ PYTHONFRAMEWORKDIR=	@PYTHONFRAMEWORKDIR@
 PYTHONFRAMEWORKPREFIX=	@PYTHONFRAMEWORKPREFIX@
 PYTHONFRAMEWORKINSTALLDIR= @PYTHONFRAMEWORKINSTALLDIR@
 
+# Environment to run shared python without installed libraries
+RUNSHARED=       @RUNSHARED@
+
 # Modes for directories, executables and data files created by the
 # install process.  Default to user-only-writable for all file types.
 DIRMODE=	755
@@ -136,6 +139,7 @@ LDLIBRARY=      @LDLIBRARY@
 BLDLIBRARY=     @BLDLIBRARY@
 DLLLIBRARY=	@DLLLIBRARY@
 LDLIBRARYDIR=   @LDLIBRARYDIR@
+INSTSONAME=	@INSTSONAME@
 
 
 LIBS=		@LIBS@
@@ -292,20 +296,20 @@ LIBRARY_OBJS=	\
 all:		$(BUILDPYTHON) oldsharedmods sharedmods
 
 # Build the interpreter
-$(BUILDPYTHON):	Modules/$(MAINOBJ) $(LDLIBRARY)
+$(BUILDPYTHON):	Modules/$(MAINOBJ) $(LIBRARY) $(LDLIBRARY)
 		$(LINKCC) $(LDFLAGS) $(LINKFORSHARED) -o $@ \
 			Modules/$(MAINOBJ) \
 			$(BLDLIBRARY) $(LIBS) $(MODLIBS) $(SYSLIBS) $(LDLAST)
 
 platform: $(BUILDPYTHON)
-	./$(BUILDPYTHON) -E -c 'import sys ; from distutils.util import get_platform ; print get_platform()+"-"+sys.version[0:3]' >platform
+	$(RUNSHARED) ./$(BUILDPYTHON) -E -c 'import sys ; from distutils.util import get_platform ; print get_platform()+"-"+sys.version[0:3]' >platform
 
 
 # Build the shared modules
 sharedmods: $(BUILDPYTHON)
 	case $$MAKEFLAGS in \
-	*-s*) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' ./$(BUILDPYTHON) -E $(srcdir)/setup.py -q build;; \
+	*-s*) $(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' ./$(BUILDPYTHON) -E $(srcdir)/setup.py -q build;; \
-	*) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' ./$(BUILDPYTHON) -E $(srcdir)/setup.py build;; \
+	*) $(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' ./$(BUILDPYTHON) -E $(srcdir)/setup.py build;; \
 	esac
 
 # buildno should really depend on something like LIBRARY_SRC
@@ -333,18 +337,11 @@ $(LIBRARY): $(LIBRARY_OBJS)
 	$(AR) cr $@ $(MODOBJS)
 	$(RANLIB) $@
 
-# This rule is only here for DG/UX and BeOS!!!
+libpython$(VERSION).so: $(LIBRARY_OBJS)
-libpython$(VERSION).so:	$(LIBRARY)
+	$(LDSHARED) -o $@ $(LIBRARY_OBJS) $(LIBC) $(LIBM)
-	case `uname -s | tr -d '/ ' | tr '[A-Z]' '[a-z]'` in \
+
-	*dgux*) \
+libpython$(VERSION).sl: $(LIBRARY_OBJS)
-	    test -d dgux || mkdir dgux; \
+	$(LDSHARED) -o $@ $(LIBRARY_OBJS) $(LIBC) $(LIBM)
-	    (cd dgux;ar x ../$^;ld -G -o ../$@ * ); \
-	    /bin/rm -rf ./dgux \
-	    ;; \
-	beos) \
-	    $(AR) so $(LIBRARY) $@ \
-	    ;; \
-	esac
 
 # This rule is here for OPENSTEP/Rhapsody/MacOSX
 $(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK): $(LIBRARY) $(PYTHONFRAMEWORKDIR)
@@ -420,10 +417,10 @@ Parser/metagrammar.o:	$(srcdir)/Parser/metagrammar.c
 Python/compile.o Python/symtable.o: $(GRAMMAR_H)
 
 Python/getplatform.o: $(srcdir)/Python/getplatform.c
-		$(CC) -c $(CFLAGS) $(CPPFLAGS) -DPLATFORM='"$(MACHDEP)"' -o $@ $(srcdir)/Python/getplatform.c
+		$(CC) -c $(CFLAGS) $(CPPFLAGS) $(CFLAGSFORSHARED) -DPLATFORM='"$(MACHDEP)"' -o $@ $(srcdir)/Python/getplatform.c
 
 Python/importdl.o: $(srcdir)/Python/importdl.c
-		$(CC) -c $(CFLAGS) $(CPPFLAGS) -I$(DLINCLDIR) -o $@ $(srcdir)/Python/importdl.c
+		$(CC) -c $(CFLAGS) $(CPPFLAGS) $(CFLAGSFORSHARED) -I$(DLINCLDIR) -o $@ $(srcdir)/Python/importdl.c
 
 Objects/unicodectype.o:	$(srcdir)/Objects/unicodectype.c \
 				$(srcdir)/Objects/unicodetype_db.h
@@ -486,7 +483,7 @@ $(LIBRARY_OBJS) $(MODOBJS) Modules/$(MAINOBJ): $(PYTHON_HEADERS)
 # Test the interpreter (twice, once without .pyc files, once with)
 TESTOPTS=	-l
 TESTPROG=	$(srcdir)/Lib/test/regrtest.py
-TESTPYTHON=	./$(BUILDPYTHON) -E -tt
+TESTPYTHON=	$(RUNSHARED) ./$(BUILDPYTHON) -E -tt
 test:		all platform
 		-find $(srcdir)/Lib -name '*.py[co]' -print | xargs rm -f
 		-$(TESTPYTHON) $(TESTPROG) $(TESTOPTS)
@@ -556,8 +553,8 @@ altbininstall:	$(BUILDPYTHON)
 		fi; \
 	done
 	$(INSTALL_PROGRAM) $(BUILDPYTHON) $(BINDIR)/python$(VERSION)$(EXE)
-	if test -f libpython$(VERSION).so; then \
+	if test -f libpython$(VERSION)$(SO); then \
-		$(INSTALL_DATA) libpython$(VERSION).so $(LIBDIR); \
+		$(INSTALL_SHARED) libpython$(VERSION)$(SO) $(LIBDIR)/$(INSTSONAME); \
 	else	true; \
 	fi
 	if test -f "$(DLLLIBRARY)"; then \
@@ -640,10 +637,10 @@ libinstall:	$(BUILDPYTHON) $(srcdir)/Lib/$(PLATDIR)
 		done; \
 	done
 	$(INSTALL_DATA) $(srcdir)/LICENSE $(LIBDEST)/LICENSE.txt
-	PYTHONPATH=$(LIBDEST) \
+	PYTHONPATH=$(LIBDEST)  $(RUNSHARED) \
 		./$(BUILDPYTHON) -tt $(LIBDEST)/compileall.py -x badsyntax \
 	        $(LIBDEST)
-	PYTHONPATH=$(LIBDEST) \
+	PYTHONPATH=$(LIBDEST) $(RUNSHARED) \
 		./$(BUILDPYTHON) -O $(LIBDEST)/compileall.py -x badsyntax $(LIBDEST)
 
 # Create the PLATDIR source directory, if one wasn't distributed..
@@ -686,12 +683,12 @@ libainstall:	all
 		else	true; \
 		fi; \
 	done
-	@if test -d $(LDLIBRARY); then :; else \
+	@if test -d $(LIBRARY); then :; else \
 		if test "$(PYTHONFRAMEWORKDIR)" = no-framework; then \
-			$(INSTALL_DATA) $(LDLIBRARY) $(LIBPL)/$(LDLIBRARY) ; \
+			$(INSTALL_DATA) $(LIBRARY) $(LIBPL)/$(LIBRARY) ; \
-			$(RANLIB) $(LIBPL)/$(LDLIBRARY) ; \
+			$(RANLIB) $(LIBPL)/$(LIBRARY) ; \
 		else \
-			echo Skip install of $(LDLIBRARY) - use make frameworkinstall; \
+			echo Skip install of $(LIBRARY) - use make frameworkinstall; \
 		fi; \
 	fi
 	$(INSTALL_DATA) Modules/config.c $(LIBPL)/config.c
@@ -733,7 +730,8 @@ libainstall:	all
 # Install the dynamically loadable modules
 # This goes into $(exec_prefix)
 sharedinstall:
-	./$(BUILDPYTHON) -E $(srcdir)/setup.py install \
+	$(RUNSHARED) ./$(BUILDPYTHON) -E $(srcdir)/setup.py install \
+	   	--prefix=$(prefix) \
 		--install-scripts=$(BINDIR) \
 		--install-platlib=$(DESTSHARED)
 

Misc/ACKS

@@ -335,6 +335,7 @@ Todd R. Palmer
 Dan Parisien
 Harri Pasanen
 Randy Pausch
+Ondrej Palkovsky
 Marcel van der Peijl
 Samuele Pedroni
 Steven Pemberton

Misc/NEWS

@@ -89,6 +89,8 @@ Tools/Demos
 
 Build
 
+- On Unix, a shared libpython2.3.so can be created with --enable-shared.
+
 - References to the CACHE_HASH and INTERN_STRINGS preprocessor symbols
   were eliminated.  They were always defined, and the internal features
   they enabled stopped being experimental long ago.

README

@@ -558,6 +558,15 @@ Linker (ld) libraries and flags for threads
 	    (jph@emilia.engr.sgi.com)
 
 
+Building a shared libpython
+---------------------------
+
+Starting with Python 2.3, the majority of the interpreter can be built
+into a shared library, which can then be used by the interpreter 
+executable, and by applications embedding Python. To enable this feature,
+configure with --enable-shared.
+
+
 Configuring additional built-in modules
 ---------------------------------------
 

configure.in

@@ -8,6 +8,9 @@ AC_CONFIG_HEADER(pyconfig.h)
 AC_SUBST(VERSION)
 VERSION=2.3
 
+AC_SUBST(SOVERSION)
+SOVERSION=1.0
+
 # Arguments passed to configure.
 AC_SUBST(CONFIG_ARGS)
 CONFIG_ARGS="$ac_configure_args"
@@ -257,14 +260,22 @@ AC_MSG_RESULT($LIBRARY)
 # (defined in the Makefiles). On Cygwin LDLIBRARY is the import library,
 # DLLLIBRARY is the shared (i.e., DLL) library.
 # 
+# RUNSHARED is used to run shared python without installed libraries
+#
+# INSTSONAME is the name of the shared library that will be use to install
+# on the system - some systems like version suffix, others don't
 AC_SUBST(LDLIBRARY)
 AC_SUBST(DLLLIBRARY)
 AC_SUBST(BLDLIBRARY)
 AC_SUBST(LDLIBRARYDIR)
+AC_SUBST(INSTSONAME)
+AC_SUBST(RUNSHARED)
 LDLIBRARY="$LIBRARY"
 BLDLIBRARY='$(LDLIBRARY)'
+INSTSONMAE='$(LDLIBRARY)'
 DLLLIBRARY=''
 LDLIBRARYDIR=''
+RUNSHARED=''
 
 # LINKCC is the command that links the python executable -- default is $(CC).
 # If CXX is set, and if it is needed to link a main function that was
@@ -301,22 +312,18 @@ then
 fi
 AC_MSG_RESULT($LINKCC)
 
-AC_MSG_CHECKING(LDLIBRARY)
+AC_MSG_CHECKING(for --enable-shared)
+AC_ARG_ENABLE(shared,
+[  --enable-shared                 disable/enable building shared python library])
 
-# DG/UX requires some fancy ld contortions to produce a .so from an .a
+if test -z "$enable_shared"
-case $MACHDEP in
+then 
-dguxR4)
+  enable_shared="no"
-      LDLIBRARY='libpython$(VERSION).so'
+fi
-      OPT="$OPT -pic"
+AC_MSG_RESULT($enable_shared)
-      ;;
+
-beos*)
+
-      LDLIBRARY='libpython$(VERSION).so'
+AC_MSG_CHECKING(LDLIBRARY)
-      ;;
-cygwin*)
-      LDLIBRARY='libpython$(VERSION).dll.a'
-      DLLLIBRARY='libpython$(VERSION).dll'
-      ;;
-esac
 
 # MacOSX framework builds need more magic. LDLIBRARY is the dynamic
 # library that we build, but we do not want to link against it (we
@@ -333,6 +340,47 @@ else
   BLDLIBRARY='$(LDLIBRARY)'
 fi  
 
+# Other platforms follow
+if test $enable_shared = "yes"; then
+  case $ac_sys_system in
+    BeOS*)
+          LDLIBRARY='libpython$(VERSION).so'
+          ;;
+    CYGWIN*)
+          LDLIBRARY='libpython$(VERSION).dll.a'
+          DLLLIBRARY='libpython$(VERSION).dll'
+          ;;
+    SunOS*)
+	  LDLIBRARY='libpython$(VERSION).so'
+	  BLDLIBRARY='-Wl,-rpath,$(LIBDIR) -L. -lpython$(VERSION)'
+	  RUNSHARED=LD_LIBRARY_PATH=`pwd`:$LD_LIBRARY_PATH
+          ;;
+    Linux*)
+	  LDLIBRARY='libpython$(VERSION).so'
+	  BLDLIBRARY='-L. -lpython$(VERSION)'
+	  RUNSHARED=LD_LIBRARY_PATH=`pwd`:$LD_LIBRARY_PATH
+	  INSTSONAME="$LDLIBRARY".$SOVERSION
+	  ;;
+    hp*|HP*)
+	  LDLIBRARY='libpython$(VERSION).sl'
+	  BLDLIBRARY='-Wl,+b,$(LIBDIR) -L. -lpython$(VERSION)'
+	  RUNSHARED=SHLIB_PATH=`pwd`:$SHLIB_PATH
+	  ;;
+    OSF*)
+	  LDLIBRARY='libpython$(VERSION).so'
+         BLDLIBRARY='-rpath $(LIBDIR) -L. -lpython$(VERSION)'
+	  RUNSHARED=LD_LIBRARY_PATH=`pwd`:$LD_LIBRARY_PATH
+	  ;;
+  esac
+  # DG/UX requires some fancy ld contortions to produce a .so from an .a
+  case $MACHDEP in
+  dguxR4)
+        LDLIBRARY='libpython$(VERSION).so'
+        OPT="$OPT -pic"
+        ;;
+  esac
+fi
+
 AC_MSG_RESULT($LDLIBRARY)
 
 AC_PROG_RANLIB
@@ -861,7 +909,8 @@ then
 	case $ac_sys_system/$ac_sys_release in
 	AIX*)	LINKFORSHARED='-Wl,-bE:Modules/python.exp -lld';;
 	hp*|HP*)
-	    LINKFORSHARED="-Wl,-E -Wl,+s -Wl,+b\$(BINLIBDEST)/lib-dynload";;
+	    LINKFORSHARED="-Wl,-E -Wl,+s";;
+#	    LINKFORSHARED="-Wl,-E -Wl,+s -Wl,+b\$(BINLIBDEST)/lib-dynload";;
 	BSD/OS/4*) LINKFORSHARED="-Xlinker -export-dynamic";;
 	Linux*|GNU*) LINKFORSHARED="-Xlinker -export-dynamic";;
 	# -u libsys_s pulls in all symbols in libsys