#-------------------------------------------------------------------------
#
# Makefile.shlib
#    Common rules for building shared libraries
#
# Copyright (c) 1998, Regents of the University of California
#
# IDENTIFICATION
#    src/Makefile.shlib
#
#-------------------------------------------------------------------------

# This file should be included by any Postgres module Makefile that
# wants to build a shared library (if possible for the current
# platform). A static library is also built from the same object
# files. Only one library can be built per makefile.
#
# Before including this file, the module Makefile must define these
# variables:
#
# NAME                  Name of library to build (no suffix nor "lib" prefix)
# OBJS                  List of object files to include in library
# SHLIB_LINK            If shared library relies on other libraries,
#                       additional stuff to put in its link command
# SHLIB_PREREQS         Order-only prerequisites for library build target
# SHLIB_EXPORTS         (optional) Name of file containing list of symbols to
#                       export, in the format "function_name  number"
#
# When building a shared library, the following version information
# must also be set.  It should be omitted when building a dynamically
# loadable module.
#
# SO_MAJOR_VERSION      Major version number to use for shared library
# SO_MINOR_VERSION      Minor version number to use for shared library
# (If you want a patchlevel, include it in SO_MINOR_VERSION, e.g., "6.2".)
#
# Optional flags when building DLL's (only applicable to win32 and cygwin
# platforms).
# DLLTOOL_DEFFLAGS      Additional flags when creating the dll .def file
# DLLTOOL_LIBFLAGS      Additional flags when creating the lib<module>.a file
# DLLWRAP_FLAGS         Additional flags to dllwrap
#
# The module Makefile must also include
# $(top_builddir)/src/Makefile.global before including this file.
# (Makefile.global sets PORTNAME and other needed symbols.)
#
# This makefile provides the following (phony) targets:
#
# all-lib               build the static and shared (if applicable) libraries
# install-lib           install the libraries into $(libdir)
# installdirs-lib       create installation directory $(libdir)
# uninstall-lib         remove the libraries from $(libdir)
# clean-lib             delete the static and shared libraries from the build dir
# maintainer-clean-lib  delete .def files built for win32
#
# Since `all-lib' is the first rule in this file you probably want to
# have the `all' target before including this file. In the most simple
# case it would look like this:
#
#     all: all-lib
#
# Similarly, the install rule might look like
#
#     install: install-lib
#
# plus any additional things you want to install. Et cetera.
#
# Got that?  Look at src/interfaces/libpq/Makefile for an example.
#
# While the linker allows creation of most shared libraries,
# -Bsymbolic requires resolution of all symbols, making the
# compiler a better choice for shared library creation on ELF platforms.
# With the linker, -Bsymbolic requires the crt1.o startup object file.
# bjm 2001-02-10


COMPILER = $(CC) $(CFLAGS)
LINK.static = $(AR) $(AROPT)



ifdef SO_MAJOR_VERSION
# Default library naming convention used by the majority of platforms
shlib		= lib$(NAME)$(DLSUFFIX).$(SO_MAJOR_VERSION).$(SO_MINOR_VERSION)
shlib_major	= lib$(NAME)$(DLSUFFIX).$(SO_MAJOR_VERSION)
shlib_bare	= lib$(NAME)$(DLSUFFIX)
# Testing the soname variable is a reliable way to determine whether a
# linkable library is being built.
soname		= $(shlib_major)
else
# Naming convention for dynamically loadable modules
shlib		= $(NAME)$(DLSUFFIX)
endif
stlib		= lib$(NAME).a

ifndef soname
# additional flags for backend modules
SHLIB_LINK += $(BE_DLLLIBS)
endif

# For each platform we support shared libraries on, set shlib to the
# name of the library (if default above is not right), set
# LINK.shared to the command to link the library,
# and adjust SHLIB_LINK if necessary.

# Try to keep the sections in some kind of order, folks...

override CFLAGS += $(CFLAGS_SL)
ifdef SO_MAJOR_VERSION
# libraries ought to use this to refer to versioned gettext domain names
override CPPFLAGS += -DSO_MAJOR_VERSION=$(SO_MAJOR_VERSION)
endif

ifeq ($(PORTNAME), aix)
  ifdef SO_MAJOR_VERSION
    shlib		= lib$(NAME)$(DLSUFFIX).$(SO_MAJOR_VERSION)
  endif
  haslibarule   = yes
  exports_file		= lib$(NAME).exp
endif

ifeq ($(PORTNAME), darwin)
  ifdef soname
    # linkable library
    DLSUFFIX		= .dylib
    ifneq ($(SO_MAJOR_VERSION), 0)
      version_link	= -compatibility_version $(SO_MAJOR_VERSION) -current_version $(SO_MAJOR_VERSION).$(SO_MINOR_VERSION)
    endif
    LINK.shared		= $(COMPILER) -dynamiclib -install_name '$(libdir)/lib$(NAME).$(SO_MAJOR_VERSION)$(DLSUFFIX)' $(version_link) $(exported_symbols_list) -multiply_defined suppress
    shlib		= lib$(NAME).$(SO_MAJOR_VERSION).$(SO_MINOR_VERSION)$(DLSUFFIX)
    shlib_major		= lib$(NAME).$(SO_MAJOR_VERSION)$(DLSUFFIX)
  else
    # loadable module
    DLSUFFIX		= .so
    LINK.shared		= $(COMPILER) -bundle -multiply_defined suppress
  endif
  BUILD.exports		= $(AWK) '/^[^\#]/ {printf "_%s\n",$$1}' $< >$@
  exports_file		= $(SHLIB_EXPORTS:%.txt=%.list)
  ifneq (,$(exports_file))
    exported_symbols_list = -exported_symbols_list $(exports_file)
  endif
endif

ifeq ($(PORTNAME), openbsd)
  ifdef ELF_SYSTEM
    LINK.shared		= $(COMPILER) -shared
    ifdef soname
      LINK.shared	+= -Wl,-x,-soname,$(soname)
    endif
    SHLIB_LINK		+= -lc
  else
    LINK.shared		= $(LD) -x -Bshareable -Bforcearchive
  endif
endif

ifeq ($(PORTNAME), freebsd)
  ifdef ELF_SYSTEM
    ifdef SO_MAJOR_VERSION
      shlib		= lib$(NAME)$(DLSUFFIX).$(SO_MAJOR_VERSION)
    endif
    LINK.shared		= $(COMPILER) -shared
    ifdef soname
      LINK.shared	+= -Wl,-x,-soname,$(soname)
    endif
  else
    ifdef SO_MAJOR_VERSION
      shlib		= lib$(NAME)$(DLSUFFIX).$(SO_MAJOR_VERSION).$(SO_MINOR_VERSION)
    endif
    LINK.shared		= $(LD) -x -Bshareable -Bforcearchive
  endif
endif

ifeq ($(PORTNAME), netbsd)
  ifdef ELF_SYSTEM
    LINK.shared		= $(COMPILER) -shared
    ifdef soname
      LINK.shared	+= -Wl,-x,-soname,$(soname)
    endif
  else
    LINK.shared		= $(LD) -x -Bshareable -Bforcearchive
  endif
endif

ifeq ($(PORTNAME), hpux)
  ifdef SO_MAJOR_VERSION
    shlib			= lib$(NAME)$(DLSUFFIX).$(SO_MAJOR_VERSION)
  endif
  ifeq ($(with_gnu_ld), yes)
    LINK.shared		= $(CC) -shared
    ifdef soname
      LINK.shared	+= -Wl,-h -Wl,$(soname)
    endif
  else
    LINK.shared		= $(LD) -b
    ifdef soname
      LINK.shared	+= +h $(soname)
    endif
    # can't use the CC-syntax rpath pattern here, so instead:
    rpath =
    ifeq ($(enable_rpath), yes)
      LINK.shared	+= +b '$(rpathdir)'
    endif
    # On HPUX platforms, gcc is usually configured to search for libraries
    # in /usr/local/lib, but ld won't do so.  Add an explicit -L switch so
    # ld can find the same libraries gcc does.  Make sure it goes after any
    # -L switches provided explicitly.
    ifeq ($(GCC), yes)
      SHLIB_LINK	+= -L/usr/local/lib
    endif
  endif
  # And we need to link with libgcc, too
  ifeq ($(GCC), yes)
    SHLIB_LINK		+= `$(CC) $(LDFLAGS) -print-libgcc-file-name`
  endif
endif

ifeq ($(PORTNAME), irix)
  ifdef SO_MAJOR_VERSION
    shlib		= lib$(NAME)$(DLSUFFIX).$(SO_MAJOR_VERSION)
  endif
  LINK.shared		= $(COMPILER) -shared
  ifdef soname
    LINK.shared		+= -Wl,-set_version,sgi$(SO_MAJOR_VERSION).$(SO_MINOR_VERSION)
  endif
endif

ifeq ($(PORTNAME), linux)
  LINK.shared		= $(COMPILER) -shared
  ifdef soname
    LINK.shared		+= -Wl,-soname,$(soname)
  endif
  BUILD.exports		= ( echo '{ global:'; $(AWK) '/^[^\#]/ {printf "%s;\n",$$1}' $<; echo ' local: *; };' ) >$@
  exports_file		= $(SHLIB_EXPORTS:%.txt=%.list)
  ifneq (,$(exports_file))
    LINK.shared		+= -Wl,--version-script=$(exports_file)
  endif
endif

ifeq ($(PORTNAME), solaris)
  ifeq ($(GCC), yes)
    LINK.shared		= $(COMPILER) -shared
  else
    LINK.shared		= $(COMPILER) -G
  endif
  ifdef soname
    ifeq ($(with_gnu_ld), yes)
      LINK.shared	+= -Wl,-soname,$(soname)
    else
      LINK.shared	+= -h $(soname)
    endif
  endif
endif

ifeq ($(PORTNAME), osf)
  LINK.shared		= $(LD) -shared -expect_unresolved '*'
endif

ifeq ($(PORTNAME), sco)
  ifeq ($(GCC), yes)
    LINK.shared		= $(CC) -shared
  else
    LINK.shared		= $(CC) -G
    endif
  LINK.shared		+= -Wl,-z,text
  ifdef soname
    LINK.shared		+= -Wl,-h,$(soname)
  endif
endif

ifeq ($(PORTNAME), unixware)
  ifeq ($(GCC), yes)
    LINK.shared		= $(CC) -shared
  else
    LINK.shared		= $(CC) -G
  endif
  LINK.shared		+= -Wl,-z,text
  ifdef soname
    LINK.shared		+= -Wl,-h,$(soname)
  endif
endif

ifeq ($(PORTNAME), cygwin)
  ifdef SO_MAJOR_VERSION
    shlib		= cyg$(NAME)$(DLSUFFIX)
  endif
  haslibarule   = yes
endif

ifeq ($(PORTNAME), win32)
  ifdef SO_MAJOR_VERSION
    shlib		= lib$(NAME)$(DLSUFFIX)
  endif
  haslibarule   = yes
endif



##
## BUILD
##

.PHONY: all-lib all-static-lib all-shared-lib

all-lib: all-shared-lib
ifdef soname
# no static library when building a dynamically loadable module
all-lib: all-static-lib
endif

all-static-lib: $(stlib)

all-shared-lib: $(shlib)

ifndef haslibarule
$(stlib): $(OBJS) | $(SHLIB_PREREQS)
	$(LINK.static) $@ $^
	$(RANLIB) $@
endif #haslibarule


ifeq (,$(filter cygwin win32,$(PORTNAME)))
ifneq ($(PORTNAME), aix)

# Normal case
$(shlib): $(OBJS) | $(SHLIB_PREREQS)
	$(LINK.shared) -o $@ $(OBJS) $(LDFLAGS) $(LDFLAGS_SL) $(SHLIB_LINK)
ifdef shlib_major
# If we're using major and minor versions, then make a symlink to major-version-only.
ifneq ($(shlib), $(shlib_major))
	rm -f $(shlib_major)
	$(LN_S) $(shlib) $(shlib_major)
endif
# Make sure we have a link to a name without any version numbers
ifneq ($(shlib), $(shlib_bare))
	rm -f $(shlib_bare)
	$(LN_S) $(shlib) $(shlib_bare)
endif
endif # shlib_major

# Where possible, restrict the symbols exported by the library to just the
# official list, so as to avoid unintentional ABI changes.  On recent Darwin
# this also quiets multiply-defined-symbol warnings in programs that use
# libpgport along with libpq.
ifneq (,$(SHLIB_EXPORTS))
ifdef BUILD.exports
$(shlib): $(SHLIB_EXPORTS:%.txt=%.list)

$(SHLIB_EXPORTS:%.txt=%.list): %.list: %.txt
	$(BUILD.exports)
endif
endif

else # PORTNAME == aix

# AIX case
$(shlib) $(stlib): $(OBJS) | $(SHLIB_PREREQS)
	$(LINK.static) $(stlib) $^
	$(RANLIB) $(stlib)
	$(MKLDEXPORT) $(stlib) >$(exports_file)
	$(COMPILER) -o $(shlib) $(stlib) -Wl,-bE:$(exports_file) $(LDFLAGS) $(LDFLAGS_SL) $(SHLIB_LINK)
	rm -f $(stlib)
	$(AR) $(AROPT) $(stlib) $(shlib)

endif # PORTNAME == aix

else # PORTNAME == cygwin || PORTNAME == win32

# Cygwin or Win32 case

# If SHLIB_EXPORTS is set, the rules below will build a .def file from
# that.  Else we build a temporary one here.
ifeq (,$(SHLIB_EXPORTS))
DLL_DEFFILE = lib$(NAME)dll.def
exports_file = $(DLL_DEFFILE)

$(exports_file): $(OBJS)
	$(DLLTOOL) --export-all $(DLLTOOL_DEFFLAGS) --output-def $@ $^
else
DLL_DEFFILE = lib$(NAME)dll.def
endif

$(shlib): $(OBJS) $(DLL_DEFFILE) | $(SHLIB_PREREQS)
	$(DLLWRAP) -o $@ --dllname $(shlib) $(DLLWRAP_FLAGS) --def $(DLL_DEFFILE) $(OBJS) $(LDFLAGS) $(LDFLAGS_SL) $(SHLIB_LINK)

$(stlib): $(shlib) $(DLL_DEFFILE) | $(SHLIB_PREREQS)
	$(DLLTOOL) --dllname $(shlib) $(DLLTOOL_LIBFLAGS) --def $(DLL_DEFFILE) --output-lib $@

endif # PORTNAME == cygwin || PORTNAME == win32


# We need several not-quite-identical variants of .DEF files to build
# DLLs for Windows.  These are made from the single source file
# exports.txt.  Since we can't assume that Windows boxes will have
# sed, the .DEF files are always built and included in distribution
# tarballs.

ifneq (,$(SHLIB_EXPORTS))
distprep: lib$(NAME)dll.def lib$(NAME)ddll.def blib$(NAME)dll.def

UC_NAME = $(shell echo $(NAME) | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ')

lib$(NAME)dll.def: $(SHLIB_EXPORTS)
	echo '; DEF file for MS VC++' >$@
	echo 'LIBRARY LIB$(UC_NAME)' >>$@
	echo 'EXPORTS' >>$@
	sed -e '/^#/d' -e 's/^\(.*[ 	]\)\([0-9][0-9]*\)/    \1@ \2/' $< >>$@

lib$(NAME)ddll.def: $(SHLIB_EXPORTS)
	echo '; DEF file for MS VC++' >$@
	echo 'LIBRARY LIB$(UC_NAME)D' >>$@
	echo 'EXPORTS' >>$@
	sed -e '/^#/d' -e 's/^\(.*[ 	]\)\([0-9][0-9]*\)/    \1@ \2/' $< >>$@

blib$(NAME)dll.def: $(SHLIB_EXPORTS)
	echo '; DEF file for Borland C++ Builder' >$@
	echo 'LIBRARY BLIB$(UC_NAME)' >>$@
	echo 'EXPORTS' >>$@
	sed -e '/^#/d' -e 's/^\(.*[ 	]\)\([0-9][0-9]*\)/    _\1@ \2/' $< >>$@
	echo >>$@
	echo '; Aliases for MS compatible names' >> $@
	sed -e '/^#/d' -e 's/^\(.*[ 	]\)\([0-9][0-9]*\)/    \1= _\1/' $< | sed 's/ *$$//' >>$@
endif # SHLIB_EXPORTS


##
## INSTALL
##

.PHONY: install-lib install-lib-static install-lib-shared installdirs-lib
install-lib: install-lib-shared
ifdef soname
install-lib: install-lib-static
endif

install-lib-static: $(stlib) installdirs-lib
	$(INSTALL_STLIB) $< '$(DESTDIR)$(libdir)/$(stlib)'
ifeq ($(PORTNAME), darwin)
	cd '$(DESTDIR)$(libdir)' && \
	ranlib $(stlib)
endif

install-lib-shared: $(shlib) installdirs-lib
ifdef soname
# we don't install $(shlib) on AIX
# (see http://archives.postgresql.org/message-id/52EF20B2E3209443BC37736D00C3C1380A6E79FE@EXADV1.host.magwien.gv.at)
ifneq ($(PORTNAME), aix)
	$(INSTALL_SHLIB) $< '$(DESTDIR)$(libdir)/$(shlib)'
ifneq ($(PORTNAME), cygwin)
ifneq ($(PORTNAME), win32)
ifneq ($(shlib), $(shlib_major))
	cd '$(DESTDIR)$(libdir)' && \
	rm -f $(shlib_major) && \
	$(LN_S) $(shlib) $(shlib_major)
endif
ifneq ($(shlib), $(shlib_bare))
	cd '$(DESTDIR)$(libdir)' && \
	rm -f $(shlib_bare) && \
	$(LN_S) $(shlib) $(shlib_bare)
endif
endif # not win32
endif # not cygwin
endif # not aix
else # no soname
	$(INSTALL_SHLIB) $< '$(DESTDIR)$(pkglibdir)/$(shlib)'
endif


installdirs-lib:
ifdef soname
	$(MKDIR_P) '$(DESTDIR)$(libdir)'
else
	$(MKDIR_P) '$(DESTDIR)$(pkglibdir)'
endif


##
## UNINSTALL
##

.PHONY: uninstall-lib
uninstall-lib:
ifdef soname
	rm -f '$(DESTDIR)$(libdir)/$(stlib)'
	rm -f '$(DESTDIR)$(libdir)/$(shlib_bare)' \
	  '$(DESTDIR)$(libdir)/$(shlib_major)' \
	  '$(DESTDIR)$(libdir)/$(shlib)'
else # no soname
	rm -f '$(DESTDIR)$(pkglibdir)/$(shlib)'
endif # no soname


##
## CLEAN
##

.PHONY: clean-lib
clean-lib:
	rm -f $(shlib) $(shlib_bare) $(shlib_major) $(stlib) $(exports_file)

ifneq (,$(SHLIB_EXPORTS))
maintainer-clean-lib:
	rm -f lib$(NAME)dll.def lib$(NAME)ddll.def blib$(NAME)dll.def
endif
