# Gentoo custom Makefile for Bitshuffle C library
# Adapted from GNU Guix:
# https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/python-compression.scm?h=v1.3.0#n346
# Distributed under the terms of the GNU General Public License v3

# To avoid bundled dependency, the copy of lz4 included
# in Bitshuffle's source tree is not used

PACKAGE_VERSION ?= 0.3.5

# Upstream has never specified an soname, so we need to conduct downstream
# soname versioning.  The format of soname is "lib${PN}.so.$(ver_cut 1)".
# No incompatible ABI changes have been observed yet since version 0.2.4,
# but just in case the upstream recklessly handles ABI compatibility,
# please try to test ABI compatibility when updating to a new release,
# using tools like 'abidiff' in dev-util/libabigail or alike.
SONAME_VERSION := $(shell echo $(PACKAGE_VERSION) | cut -d. -f1)
SONAME_BASE = libbitshuffle.so
SONAME := $(SONAME_BASE).$(SONAME_VERSION)
SOFILE := $(SONAME_BASE).$(PACKAGE_VERSION)

CFLAGS := -O3 -ffast-math -std=c99 -fPIC $(CFLAGS)

OBJS = \
	src/bitshuffle.o \
	src/bitshuffle_core.o \
	src/iochain.o

LIBS := -llz4

$(SOFILE): $(OBJS)
	$(CC) $(CFLAGS) -o $@ -shared $(LDFLAGS) -Wl,-soname,$(SONAME) $^ $(LIBS)

%.o: %.c
	$(CC) $(CFLAGS) -Isrc -c $< -o $@

INSTALL = install
LN_S = ln -s

PREFIX = /usr/local
LIBDIR = $(PREFIX)/lib
INCLUDEDIR = $(PREFIX)/include

install: $(SOFILE)
	$(INSTALL) -dm755 $(DESTDIR)$(LIBDIR)
	$(INSTALL) -dm755 $(DESTDIR)$(INCLUDEDIR)
	$(INSTALL) -m755 $(SOFILE) $(DESTDIR)$(LIBDIR)
	$(INSTALL) -m644 src/bitshuffle.h $(DESTDIR)$(INCLUDEDIR)
	$(INSTALL) -m644 src/bitshuffle_core.h $(DESTDIR)$(INCLUDEDIR)
	$(INSTALL) -m644 src/iochain.h $(DESTDIR)$(INCLUDEDIR)
	$(LN_S) $(SOFILE) $(DESTDIR)$(LIBDIR)/$(SONAME_BASE)
	$(LN_S) $(SOFILE) $(DESTDIR)$(LIBDIR)/$(SONAME)