Makefile

# https://gist.github.com/4948295
# GistID: 4948295
#
# prereq:
# apt-get install build-essential clang gobjc libicu-dev libxml2-dev libgnutls-dev libssl-dev
#
# Based on: http://www.dev-smart.com/archives/401

# Install:
#    clang (Low-Level Virtual Machine (LLVM), C language family frontend)
#    libgnustep-base-dev              (GNUstep Base header files and development libraries)
#    libdispatch-dev
#    libdispatch0
#    libffi6
#    libffi-dev
#    libxslt-dev
#    libicu-dev
#
#
#    On a Debian system, like Ubuntu, it will install other dependencies for gnustep, including
#    the:
#        gnustep-base-common
#        gnustep-base-runtime
#        gnustep-common
#        gnustep-make
#        gobjc-4.6
#        libgnustep-base-dev
#        libgnustep-base1.22
#        libobjc3
#    These are not necessary as clang has its own Objective-C compiler and runtime.
#    The runtime it installs here is for gcc.
#
# Ref: http://wiki.gnustep.org/index.php/GNUstep_under_Ubuntu_Linux
# Ref: http://lists.gnu.org/archive/html/discuss-gnustep/2012-08/msg00094.html
# Ref: http://www.dev-smart.com/archives/401
#
# To run code compiled against these libraries, set LD_LIBRARY_PATH=$(BUILD_DIR)/lib


.PHONY: clean

ifdef DEBUG
SILENT :=
REDIR_NULL :=
else
SILENT := @
REDIR_NULL := "2> /dev/null"
endif

BUILD_DIR := $(shell pwd)/build

LIBOBJC2_VER := libobjc2-1.6.1
LIBOBJC2_TAR := $(LIBOBJC2_VER).tgz
LIBOBJC2_LIB := $(BUILD_DIR)/lib/libobjc.so.4.6.0

GNUSTEP_BASE_VER := gnustep-base-1.24.0
GNUSTEP_BASE_TAR := $(GNUSTEP_BASE_VER).tar.gz
GNUSTEP_BASE_LIB := $(BUILD_DIR)/lib/libgnustep-base.so

GNUSTEP_MAKE_VER := gnustep-make-2.6.2
GNUSTEP_MAKE_TAR := $(GNUSTEP_MAKE_VER).tar.gz
GNUSTEP_MAKE_CFG := $(BUILD_DIR)/bin/gnustep-config


all: hello gcd

clean:
	$(SILENT)echo -n Cleaning...
	$(SILENT)-rm -f *.d
	$(SILENT)-rm -f hello gcd
	$(SILENT)echo done.

distclean: clean
	$(SILENT)echo -n Cleaning real good...
	$(SILENT)-rm -rf $(BUILD_DIR) $(LIBOBJC2_VER) $(LIBOBJC2_TAR)
	$(SILENT)-rm -rf $(GNUSTEP_BASE_VER) $(GNUSTEP_BASE_TAR)
	$(SILENT)-rm -rf $(GNUSTEP_MAKE_VER) $(GNUSTEP_MAKE_TAR)
	$(SILENT)echo done.

####
$(GNUSTEP_BASE_TAR):
	$(SILENT)echo -n Downloading $@...
	$(SILENT)wget http://ftp.gnustep.org/pub/gnustep/core/$(GNUSTEP_BASE_TAR) 2> /dev/null
	$(SILENT)echo done.
	
	$(SILENT)echo -n Extracting $@...
	$(SILENT)tar zxvf $(GNUSTEP_BASE_TAR) 2>&1 > /dev/null
	$(SILENT)echo done.

$(LIBOBJC2_TAR):
	$(SILENT)echo -n Downloading $@...
	$(SILENT)wget http://download.gna.org/gnustep/$(LIBOBJC2_TAR) 2> /dev/null
	$(SILENT)echo done.
	
	$(SILENT)echo -n Extracting $@...
	$(SILENT)tar zxvf $(LIBOBJC2_TAR) 2>&1 > /dev/null
	$(SILENT)echo done.

$(GNUSTEP_MAKE_TAR):
	$(SILENT)echo -n Downloading $@...
	$(SILENT)wget http://ftp.gnustep.org/pub/gnustep/core/$(GNUSTEP_MAKE_TAR) 2> /dev/null
	$(SILENT)echo done.
	
	$(SILENT)echo -n Extracting $@...
	$(SILENT)tar zxvf $(GNUSTEP_MAKE_TAR) 2>&1 > /dev/null
	$(SILENT)echo done.
####


####
$(GNUSTEP_MAKE_CFG): $(GNUSTEP_MAKE_TAR)
	$(SILENT)echo -n Compiling $(GNUSTEP_MAKE_VER)...
	$(SILENT)cd $(GNUSTEP_MAKE_VER) && \
	CC="clang" CXX="clang++" ./configure --prefix="$(BUILD_DIR)" 2>&1 > /dev/null &&\
	make install
	$(SILENT)echo done.

$(LIBOBJC2_LIB): $(LIBOBJC2_TAR)
	# clang seems sensitive to which order shared libraries are added
	# to the command-line. The only way I can see to fix the problem in 
	# compiling gnustep_base during its configure phase is to patch
	# the libobjc2 Makefile and force it to link to libdispatch ahead of time
	$(SILENT)echo -n Compiling $(LIBOBJC2_VER)...
	$(SILENT)cd $(LIBOBJC2_VER) && \
	sed -i 's/^\(\s*-o $$@ $$(OBJECTS)\)/\1 -ldispatch/g' Makefile && \
	sed -i 's/^\(\s*-o $$@ $$(OBJCXX_OBJECTS)\)/\1 -ldispatch/g' Makefile && \
	. $(BUILD_DIR)/share/GNUstep/Makefiles/GNUstep.sh && \
	CC="clang" CXX="clang++" LIBS="-ldispatch" PREFIX="$(BUILD_DIR)" make -f Makefile install
	$(SILENT)echo done.

$(GNUSTEP_BASE_LIB): $(GNUSTEP_MAKE_CFG) $(LIBOBJC2_LIB) $(GNUSTEP_BASE_TAR)
	$(SILENT)echo -n Compiling $(GNUSTEP_BASE_VER)...
	$(SILENT)cd $(GNUSTEP_BASE_VER) && \
	. $(BUILD_DIR)/share/GNUstep/Makefiles/GNUstep.sh && \
	CC="clang" CXX="clang++"  ./configure --prefix="$(BUILD_DIR)" 2>&1 > /dev/null && \
	make && make install
	$(SILENT)echo done.
####

hello: $(GNUSTEP_BASE_LIB)
	$(SILENT)echo -n Compiling $@...
	$(SILENT)clang -I$(BUILD_DIR)/include -L$(BUILD_DIR)/lib `$(BUILD_DIR)/bin/gnustep-config --objc-flags` `$(BUILD_DIR)/bin/gnustep-config --objc-libs` -fobj-arc -fobjc-runtime=gnustep -fblocks  -lobjc hello.m -o hello
	$(SILENT)echo done.
	$(SILENT)echo Since this is a local install, set "LD_LIBRARY_PATH=$(BUILD_DIR)/lib" in your environment before executing.


gcd:  $(GNUSTEP_BASE_LIB)
	$(SILENT)echo -n Compiling $@...
	$(SILENT)clang gcd.m -I$(BUILD_DIR)/include -L$(BUILD_DIR)/lib `$(BUILD_DIR)/bin/gnustep-config --objc-flags` `$(BUILD_DIR)/bin/gnustep-config --objc-libs` -I/usr/include/GNUstep -lgnustep-base -lobjc -fobjc-runtime=gnustep -fobj-arc -fblocks  -lobjc -ldispatch -o gcd
	$(SILENT)echo done.
	$(SILENT)echo Since this is a local install, set "LD_LIBRARY_PATH=$(BUILD_DIR)/lib" in your environment before executing.