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# -*-makefile-*- <-- an Emacs control
# The including make file must define these make variables:
#
# SHARED_LIBS_TO_BUILD: List of the shared libraries that need to be
# built -- just the basic library names. E.g. "libfoo libbar"
#
# SHARED_LIBS_TO_INSTALL: List of the shared libraries that need to be
# installed -- just the basic library names. E.g. "libfoo libbar"
#
# SHLIB_SUFFIX: Shared library filename suffix, e.g. "so".
#
# MAJ: Library major version number, e.g. "3" in file name "libfoo.3.1"
#
# MIN: Library minor version number, e.g. "1" in file name "libfoo.3.1"
#
# LDFLAGS_SHLIB: linker (Ld) flags needed to link object files together into
# a shared library. May use $(SONAME) for the soname of the library.
# Include -lc if appropriate.
#
# LADD: Additional linker flags (normally set on the make command line).
#
# INSTALL_DATA: beginning of shell command to install a library file.
#
# DESTDIR: main installation directory
#
# LIBINST_DIR: directory in which to install libraries, relative to DESTDIR.
#
# LN_S: beginning of shell command to make symbolic link (e.g. "ln -s").
#
# CXXLD: beginning of shell command to link, e.g. "g++".
# This make file defines these make variables that the including make file
# can use:
#
# SHLIB_CMD: a command to build a shared library for C linkage
# You can use this in a rule to build a shared library
# SHLIBPP_CMD: Same, but for C++ linkage
# Including make file must contain a rule to build each library file
# (e.g. libfoo.3.1)
# This make file provides these rules:
#
# install-shared-libraries: install all shared libraries and the necessary
# symbolic links.
# SONAME is to be referenced by $(LDFLAGS_SHLIB) in $(SHLIB_RULE)
# SONAME is the name of the library file being built, with the minor
# version number cut off. E.g. if we're building libfoo.so.1.2, SONAME
# is libfoo.so.1 .
SONAME = $(@:%.$(MIN)=%)
SHLIB_CMD = $(CCLD) $(LADD) $(LDFLAGS_SHLIB) -o $@ $^
SHLIB_LE_TARGETS = $(call shliblefn, $(SHARED_LIBS_TO_BUILD))
$(SHLIB_LE_TARGETS):%:%.$(MAJ).$(MIN)
rm -f $@
$(LN_S) $< $@
.PHONY: $(SHLIB_INSTALL_TARGETS)
.PHONY: install-shared-libraries
SHLIB_INSTALL_TARGETS = $(SHARED_LIBS_TO_INSTALL:%=%/install)
#SHLIB_INSTALL_TARGETS is like "libfoo/install libbar/install"
install-shared-libraries: $(SHLIB_INSTALL_TARGETS)
$(SHLIB_INSTALL_TARGETS):%/install:%.$(SHLIB_SUFFIX).$(MAJ).$(MIN)
# $< is a library file name, e.g. libfoo.so.3.1 .
$(INSTALL_SHLIB) $< $(DESTDIR)$(LIBINST_DIR)/$<
cd $(DESTDIR)$(LIBINST_DIR); \
rm -f $(<:%.$(MIN)=%); \
$(LN_S) $< $(<:%.$(MIN)=%)
cd $(DESTDIR)$(LIBINST_DIR); \
rm -f $(<:%.$(MAJ).$(MIN)=%); \
$(LN_S) $(<:%.$(MIN)=%) $(<:%.$(MAJ).$(MIN)=%)
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