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.
----------
components: +Extension Modules
nosy: +masamoto
versions: +Python 3.5, Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27374>
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