Cannot Compile "Embed" Demo

I was looking for a way to create executable from cython, and I found the demo at (https://github.com/cython/cython/tree/master/Demos/embed).

I downloaded the repo as I already had Cython Installed, I ran the command make on terminal but it failed with the following terminal message.

palash@ash:~/Downloads/cython-master/Demos/embed$ make
gcc -pthread -B /home/palash/anaconda3/compiler_compat -Wl,--sysroot=/ -c embedded.c -I/home/palash/anaconda3/include/python3.6m -I/home/palash/anaconda3/include/python3.6m
gcc -pthread -B /home/palash/anaconda3/compiler_compat -Wl,--sysroot/ -o embedded embedded.o -L/home/palash/anaconda3/lib -L/home/palash/anaconda3/lib/python3.6/config-3.6m-i386-linux-gnu -lpython3.6m -lpthread -ldl -lutil -lrt -lm -Xlinker -export-dynamic
/home/palash/anaconda3/compiler_compat/ld: unrecognized option '--sysroot/'
/home/palash/anaconda3/compiler_compat/ld: use the --help option for usage information
collect2: error: ld returned 1 exit status
Makefile:19: recipe for target 'embedded' failed
make: *** [embedded] Error 1

MY OS : Ubuntu 17.04 32bit GCC :

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/7/lto-wrapper
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7-20170407-0ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=i686-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-targets=all --enable-multiarch --disable-werror --with-arch-32=i686 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu
Thread model: posix
gcc version 7.0.1 20170407 (experimental) [trunk revision 246759] (Ubuntu 7-20170407-0ubuntu2) 

PYTHON : 3.6 Anaconda Distribution

Anyone With Help?

[scoder]

You can set an rpath using -Wl,-rpath=....

See (and search for rpath in) https://ftp.gnu.org/old-gnu/Manuals/ld-2.9.1/html_node/ld_3.html

[bauripalash]

I think I solved the problem. Here’s my new makefile, I tweaked the LINKCC a little to make it work

# Makefile for creating our standalone Cython program
PYTHON := python
PYVERSION := $(shell $(PYTHON) -c "import sys; print(sys.version[:3])")
PYPREFIX := $(shell $(PYTHON) -c "import sys; print(sys.prefix)")

INCDIR := $(shell $(PYTHON) -c "from distutils import sysconfig; print(sysconfig.get_python_inc())")
PLATINCDIR := $(shell $(PYTHON) -c "from distutils import sysconfig; print(sysconfig.get_python_inc(plat_specific=True))")
LIBDIR1 := $(shell $(PYTHON) -c "from distutils import sysconfig; print(sysconfig.get_config_var('LIBDIR'))")
LIBDIR2 := $(shell $(PYTHON) -c "from distutils import sysconfig; print(sysconfig.get_config_var('LIBPL'))")
PYLIB := $(shell $(PYTHON) -c "from distutils import sysconfig; print(sysconfig.get_config_var('LIBRARY')[3:-2])")

CC := $(shell $(PYTHON) -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_var('CC'))")
LINKCC := gcc -pthread -B /home/palash/anaconda3/compiler_compat -Wl,--sysroot=/
LINKFORSHARED := $(shell $(PYTHON) -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_var('LINKFORSHARED'))")
LIBS := $(shell $(PYTHON) -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_var('LIBS'))")
SYSLIBS :=  $(shell $(PYTHON) -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_var('SYSLIBS'))")

embedded: embedded.o
	$(LINKCC) -o $@ $^ -L$(LIBDIR1) -L$(LIBDIR2) -l$(PYLIB) $(LIBS) $(SYSLIBS) $(LINKFORSHARED)

embedded.o: embedded.c
	$(CC) -c $^ -I$(INCDIR) -I$(PLATINCDIR)

CYTHON := ../../cython.py
embedded.c: embedded.pyx
	@$(PYTHON) $(CYTHON) --embed embedded.pyx

all: embedded

clean:
	@echo Cleaning Demos/embed
	@rm -f *~ *.o *.so core core.* *.c embedded test.output

test: clean all
	PYTHONHOME=$(PYPREFIX) LD_LIBRARY_PATH=$(LIBDIR1):$$LD_LIBRARY_PATH ./embedded > test.output
	$(PYTHON) assert_equal.py embedded.output test.output

I ran the test make test and it gave me Files identical output

But I Have a Question… If i run ./embedded it gives me this

$ ./embedded
./embedded: error while loading shared libraries: libpython3.6m.so.1.0: cannot open shared object file: No such file or directory

but if i run this PYTHONHOME=/home/palash/anaconda3 LD_LIBRARY_PATH=/home/palash/anaconda3/lib:$LD_LIBRARY_PATH ./embedded as mentioned in make test it works perfectly.

So My Question Is, can’t I just invoke the command ./embedded and it runs or I have to run the lengthy command (mentioned above) every time to run my program?

and

Is there any way to fix the LINKCC problem permanently so I don’t have to tweak Makefiles every time?