[issue27374] Cygwin: Makefile does not install DLL import library

[Irit Katriel]

Change by Irit Katriel :


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resolution: duplicate -> wont fix

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[issue27374] Cygwin: Makefile does not install DLL import library

[Irit Katriel]

Change by Irit Katriel :


--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> Cygwin is unsupported - close all open issues and list them 
here.

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[issue27374] Cygwin: Makefile does not install DLL import library

[Irit Katriel]

Irit Katriel  added the comment:

See also Issue19241.

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nosy: +iritkatriel

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[issue27374] Cygwin: Makefile does not install DLL import library

[Masayuki Yamamoto]

Masayuki Yamamoto added the comment:

I don't know why Cygwin packaging script (cygport) doesn't copy direct 
libpythonX.Ym.dll.a to /usr/lib.  Hence I wrote the patch that doesn't conflict 
with cygport script.

In current makefile rule for Cygwin, Install $(LDLIBRARY) into $(LIBPL).  
Therefore I prefer symlink from $(LIBPL) than copying direct library file to 
$(LIBDIR).
What do you think of makefile rule addition that is same effect (symlink from 
LIBPL) as cygport script?

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[issue27374] Cygwin: Makefile does not install DLL import library

[Erik Bray]

Erik Bray added the comment:

Masayuki--concerning your above comments, I think this is similar to, if not 
the same as #13756

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[issue27374] Cygwin: Makefile does not install DLL import library

[Masayuki Yamamoto]

Masayuki Yamamoto added the comment:

I found -L option addition at Lib/distutils/command/build_ext.py:222.  This 
place is a process that finalize options for the build_ext command.
Comment in there: for extensions under Cygwin and AtheOS Python's library 
directory must be appended to library_dirs

After that I searched Makefile rule for installing $(LDLIBRARY) into 
"$(prefix)/lib/python3.5/config-3.5m" to look for way of simplifying code.  And 
I came across the $(LIBPL) configuration variable that is used by installation 
of the configuration for building library.
Hence I made a patch that adds to library_dirs the $(LIBPL) configuration 
variable instead of the "$(prefix)/lib/python$(VERSION)/config".  I succeeded 
to build '_speedups' C extension module of simplejson using new python that is 
applied this patch.
Erik, Would you be able to verify this patch?
Thanks

Build log:
$ patch -p1 <3.5-issue27374-distutils-build_ext.patch
$ ./configure --prefix=/opt/py35 --with-threads --with-dbmliborder=gdbm 
--with-system-ffi --with-system-expat
$ make touch && make -j2 && make altinstall
$ /opt/py35/bin/python3.5 -V
Python 3.5.2+
$ LANG=C /opt/py35/bin/pip3.5 install -v simplejson
(snip)
running build_ext
building 'simplejson._speedups' extension
creating build/temp.cygwin-2.6.0-i686-3.5
creating build/temp.cygwin-2.6.0-i686-3.5/simplejson
gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall 
-Wstrict-prototypes -I/opt/py35/include/python3.5m -c simplejson/_speedups.c -o 
build/temp.cygwin-2.6.0-i686-3.5/simplejson/_speedups.o
gcc -shared -Wl,--enable-auto-image-base 
build/temp.cygwin-2.6.0-i686-3.5/simplejson/_speedups.o 
-L/opt/py35/lib/python3.5/config-3.5m -L/opt/py35/lib -lpython3.5m -o 
build/lib.cygwin-2.6.0-i686-3.5/simplejson/_speedups.cpython-35m.dll
running install_lib
(snip)

--
Added file: 
http://bugs.python.org/file44685/3.5-issue27374-distutils-build_ext.patch

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[issue27374] Cygwin: Makefile does not install DLL import library

[Masayuki Yamamoto]

Masayuki Yamamoto added the comment:

I'm so sorry that I misspelled your name, Erik.

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[issue27374] Cygwin: Makefile does not install DLL import library

[Masayuki Yamamoto]

Masayuki Yamamoto added the comment:

Hello, Eric.
I tried to build the '_speedups' C extension module of simplejson (third party 
library) using the python built on cygwin. As you pointed out, the build of 
'_speedups' C extension module at the stage of the link failed.

build log:
Python3.5.2+ has be used. It has applyed patches to known issues.

$ ./configure --prefix=/opt/py35 --with-threads --with-dbmliborder=gdbm 
--with-system-ffi --with-system-expat
$ make && make altinstall
$ LANG=C /opt/py35/bin/pip3.5 install simplejson
(snip)
running build_ext
building 'simplejson._speedups' extension
creating build/temp.cygwin-2.6.0-i686-3.5
creating build/temp.cygwin-2.6.0-i686-3.5/simplejson
gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall 
-Wstrict-prototypes -I/opt/py35/include/python3.5m -c simplejson/_speedups.c -o 
build/temp.cygwin-2.6.0-i686-3.5/simplejson/_speedups.o
gcc -shared -Wl,--enable-auto-image-base 
build/temp.cygwin-2.6.0-i686-3.5/simplejson/_speedups.o 
-L/opt/py35/lib/python3.5/config -L/opt/py35/lib -lpython3.5m -o 
build/lib.cygwin-2.6.0-i686-3.5/simplejson/_speedups.cpython-35m.dll
/usr/lib/gcc/i686-pc-cygwin/5.4.0/../../../../i686-pc-cygwin/bin/ld: cannot 
find -lpython3.5m
collect2: error: ld returned 1 exit status
***
WARNING: The C extension could not be compiled, speedups are not enabled.
Failure information, if any, is above.
I'm retrying the build without the C extension now.
***
(snip)

In the log, -L option specified to "/opt/py35/lib/python3.5/config". But, the 
current python has "/opt/py35/lib/python3.5/config-3.5m" instead of 
"/opt/py35/lib/python3.5/config". And libpython3.5m.dll.a library exists in the 
config-3.5m. I think that to succeed building a C extension module if -L 
options is changed to "/opt/py35/lib/python3.5/config-3.5m". 
I'm going to try to find the place that add -L option at build time.

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components: +Extension Modules
nosy: +masamoto
versions: +Python 3.5, Python 3.6

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[issue27374] Cygwin: Makefile does not install DLL import library

[Erik Bray]

New submission from Erik Bray:

When building Python on Cygwin, both a libpython-X.Y.dll and a
libpython-X.Y.dll.a are created (see https://cygwin.com/cygwin-ug-net/dll.html).

The latter is an "import library"
consisting of stubs for functions in the DLL so that it can be linked
to statically when building, for example, extension modules.

The odd bit is that in the altbininstall target if the
$(DLLLIBRARY) variable (which references the .dll itself) is defined then only 
it is installed, while $(LDLIBRARY) (which in this cases references the .dll.a 
import library) is *not* installed, except in $(prefix)/lib/pythonX.Y/config, 
which is not normally on the linker search path, or even included by
python-config --ldflags.

Therefore static linking to libpython fails, unless the search path is 
explicitly modified, or a symlink is created from 
$(prefix)/lib/pythonX.Y/config/libpython.dll.a to $(prefix)/lib.  In fact the 
Makefile already does the latter, again not if $(DLLLIBRARY) is defined.

In fact Cygwin's own package for Python manually creates the latter symlink in 
its install script.  But I would consider it a bug in Python's Makefile that it 
doesn't handle this.

I first asked on Python-dev about this back in April but got no reply 
(understandably) probably due to the lack of core devs who can comment on 
Cygwin :)

--
components: Installation
files: cygwin-ldlibrary.patch
keywords: patch
messages: 269116
nosy: erik.bray
priority: normal
severity: normal
status: open
title: Cygwin: Makefile does not install DLL import library
type: behavior
Added file: http://bugs.python.org/file43519/cygwin-ldlibrary.patch

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