[Scons-users] SharedLibrary + SHLIBVERSION and cygwin
Paweł Tomulik
ptomulik at meil.pw.edu.pl
Fri Aug 28 07:59:36 EDT 2015
Hi, any ideas here?
W dniu 2015-08-18 23:11, Paweł Tomulik pisze:
> No, it doesn't seem to help:
>
> ptomulik at mwnotebook:$ scons --tree=all
> scons: Reading SConscript files ...
> scons: done reading SConscript files.
> scons: Building targets ...
> g++ -o foo.os -c -I. foo.cpp
> g++ -o cygfoo-0-1-2.dll -Wl,-no-undefined -shared -Wl,-Bsymbolic
> -Wl,--out-implib,cygfoo-0-1-2.a -Wl,--out-implib=libfoo-0-1-2.dll.a
> -Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--whole-archive
> foo.os -Wl,--no-whole-archive -L.
> g++ -o main.o -c -I. main.cpp
> g++ -o main.exe -Wl,-no-undefined main.o -L. -lfoo
> /bin/ld: cannot find -lfoo
> collect2: error: ld returned 1 exit status
> scons: *** [main.exe] Error 1
> +-.
> +-cygfoo-0-1-2.dll
> | +-foo.os
> | +-foo.cpp
> | +-/bin/g++
> +-cygfoo.dll
> +-foo.cpp
> +-foo.hpp
> +-foo.os
> | +-foo.cpp
> | +-/bin/g++
> +-libfoo-0-1-2.dll.a
> | +-foo.os
> | +-foo.cpp
> | +-/bin/g++
> +-main.cpp
> +-main.exe
> | +-main.o
> | | +-main.cpp
> | | +-foo.hpp
> | | +-/bin/g++
> | +-/bin/g++
> +-main.o
> | +-main.cpp
> | +-foo.hpp
> | +-/bin/g++
> +-SConstruct
> scons: building terminated because of errors.
>
>
> After a single scons pass I see the following files in tree:
>
> ptomulik at mwnotebook:$ ls -lah
> razem 28K
> drwxr-xr-x+ 1 ptomulik Brak 0 08-18 22:34 .
> drwxrwxrwt 1 ptomulik root 0 08-18 22:34 ..
> -rw-r--r-- 1 ptomulik Brak 9,7K 08-18 22:34 .sconsign.dblite
> lrwxrwxrwx 1 ptomulik Brak 18 08-18 22:34 cygfoo-0-1-2.dll ->
> cygfoo-0-1-2.dll.0
> lrwxrwxrwx 1 ptomulik Brak 16 08-18 22:34 cygfoo-0-1-2.dll.0 ->
> cygfoo-0-1-2.dll
> -rw-r--r-- 1 ptomulik Brak 25 08-10 11:12 foo.cpp
> -rw-r--r-- 1 ptomulik Brak 50 08-10 11:12 foo.hpp
> -rw-r--r-- 1 ptomulik Brak 616 08-18 22:34 foo.os
> -rw-r--r-- 1 ptomulik Brak 2,8K 08-18 22:34 libfoo-0-1-2.dll.a
> -rw-r--r-- 1 ptomulik Brak 48 08-10 11:14 main.cpp
> -rw-r--r-- 1 ptomulik Brak 680 08-18 22:34 main.o
> -rw-r--r-- 1 ptomulik Brak 1,3K 08-10 11:37 README.txt
> -rw-r--r-- 1 ptomulik Brak 242 08-10 11:51 SConstruct
>
> Instead of the shared library cygfoo-*.dll I've got two symlinks with a
> circular dependency. I'm newbie here, but taking a look into my /usr/lib
> I can't see much "versioned names" with symlinks that would resemble the
> usual Linux way of shlib versioning. Quite better under /usr/bin/ where
> cygwin stored cyg*.dll stuff, but there is still quite small number of
> such symlinks. Has anyone checked whet is the standard way of
> implementing versioned libraries on cygwin (if there is any)? Do you
> know any docs, which describe it?
>
> Anyway, with unmodified SCons source, I let myself to perform two simple
> experiments. First, I've ran scons once (which failed), then created the
> following symlink
>
> ln -s libfoo-0-1-2.dll.a libfoo.dll.a
>
> and ran scons again - the mini-project was built successfully now.
>
> Second experiment was similar, just with:
>
> ln -s cygfoo-0-1-2.dll cygfoo.dll
>
> and it let me build the project as well.
>
> The difference between the two was that in the second case, scons -c
> cleaned up the symbolic link cygfoo.dll, whereas in the first case the
> link libfoo.dll.a was not cleaned up.
>
>
>
> W dniu 2015-08-18 17:31, Bill Deegan pisze:
>> Try changing line 259 of SCons/Tool/__init__.py from:
>>
>> elif platform == 'posix' or platform == 'sunos':
>>
>> to
>> elif platform == 'posix' or platform == 'sunos' or platform ==
>> 'cygwin':
>>
>> And see if that fixes it.
>>
>> -Bill
>>
>>
>> On Tue, Aug 18, 2015 at 10:23 AM, Paweł Tomulik <ptomulik at meil.pw.edu.pl
>> <mailto:ptomulik at meil.pw.edu.pl>> wrote:
>>
>> I'm not sure,
>>
>> AFAIR I only use packages installed via cygwin's "setup.exe"
>> utility. I'm not 100% concious of how that stuff works...
>>
>>
>> On 2015-08-18 15:57, Bill Deegan wrote:
>>
>> Looks like you are using the mingw tools and not native cygwin
>> compiler?
>>
>> -Bill
>>
>> On Tue, Aug 18, 2015 at 8:58 AM, Paweł Tomulik
>> <ptomulik at meil.pw.edu.pl <mailto:ptomulik at meil.pw.edu.pl>> wrote:
>>
>> Hi all,
>>
>> I just started experimenting with SCons on cygwing trying to
>> port
>> one of my projects to cygwin. Looks like I'm unlucky with the
>> SharedLibrary builder or just misunderstand how stuff works.
>>
>> At the moment I'm trying to build a minimal project with one
>> executable and one shared library. The following is build
>> report
>> from that simple project (attached) on cygwin, SCons 2.3.4,
>> python
>> 2.7.10:
>>
>> ptomulik at mwnotebook:$ scons --tree=all
>> scons: Reading SConscript files ...
>> scons: done reading SConscript files.
>> scons: Building targets ...
>> g++ -o cygfoo-0-1-2.dll -Wl,-no-undefined -shared
>> -Wl,-Bsymbolic
>> -Wl,--out-implib,cygfoo-0-1-2.a
>> -Wl,--out-implib=libfoo-0-1-2.dll.a
>> -Wl,--export-all-symbols -Wl,--enable-auto-import
>> -Wl,--whole-archive foo.os -Wl,--no-whole-archive -L.
>> g++ -o main.exe -Wl,-no-undefined main.o -L. -lfoo
>> /bin/ld: cannot find -lfoo
>> collect2: error: ld returned 1 exit status
>> scons: *** [main.exe] Error 1
>> +-.
>> +-cygfoo-0-1-2.dll
>> | +-cygfoo-0-1-2.dll
>> | +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-cygfoo-0-1-2.dll
>> | +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-foo.cpp
>> +-foo.hpp
>> +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-libfoo-0-1-2.dll.a
>> | +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-main.cpp
>> +-main.exe
>> | +-main.o
>> | | +-main.cpp
>> | | +-foo.hpp
>> | | +-/bin/g++
>> | +-/bin/g++
>> | +-cygfoo-0-1-2.dll
>> | +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-main.o
>> | +-main.cpp
>> | +-foo.hpp
>> | +-/bin/g++
>> +-SConstruct
>> scons: building terminated because of errors.
>>
>> This is for SCons 2.3.5:
>>
>> ptomulik at mwnotebook:$ scons --tree=all
>> scons: Reading SConscript files ...
>> scons: done reading SConscript files.
>> scons: Building targets ...
>> g++ -o foo.os -c -I. foo.cpp
>> g++ -o cygfoo-0-1-2.dll -Wl,-no-undefined -shared
>> -Wl,-Bsymbolic
>> -Wl,--out-implib,cygfoo-0-1-2.a
>> -Wl,--out-implib=libfoo-0-1-2.dll.a
>> -Wl,--export-all-symbols -Wl,--enable-auto-import
>> -Wl,--whole-archive foo.os -Wl,--no-whole-archive -L.
>> g++ -o main.o -c -I. main.cpp
>> g++ -o main.exe -Wl,-no-undefined main.o -L. -lfoo
>> /bin/ld: cannot find -lfoo
>> collect2: error: ld returned 1 exit status
>> scons: *** [main.exe] Error 1
>> +-.
>> +-cygfoo-0-1-2.dll
>> | +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-cygfoo.dll
>> +-foo.cpp
>> +-foo.hpp
>> +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-libfoo-0-1-2.dll.a
>> | +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-main.cpp
>> +-main.exe
>> | +-main.o
>> | | +-main.cpp
>> | | +-foo.hpp
>> | | +-/bin/g++
>> | +-/bin/g++
>> +-main.o
>> | +-main.cpp
>> | +-foo.hpp
>> | +-/bin/g++
>> +-SConstruct
>> scons: building terminated because of errors.
>>
>> This is for SCons 2.3.6:
>>
>> ptomulik at mwnotebook:$ scons --tree=all
>> scons: Reading SConscript files ...
>> scons: done reading SConscript files.
>> scons: Building targets ...
>> g++ -o foo.os -c -I. foo.cpp
>> g++ -o cygfoo-0-1-2.dll -Wl,-no-undefined -shared
>> -Wl,-Bsymbolic
>> -Wl,--out-implib,cygfoo-0-1-2.a
>> -Wl,--out-implib=libfoo-0-1-2.dll.a
>> -Wl,--export-all-symbols -Wl,--enable-auto-import
>> -Wl,--whole-archive foo.os -Wl,--no-whole-archive -L.
>> g++ -o main.o -c -I. main.cpp
>> g++ -o main.exe -Wl,-no-undefined main.o -L. -lfoo
>> /bin/ld: cannot find -lfoo
>> collect2: error: ld returned 1 exit status
>> scons: *** [main.exe] Error 1
>> +-.
>> +-cygfoo-0-1-2.dll
>> | +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-cygfoo.dll
>> +-foo.cpp
>> +-foo.hpp
>> +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-libfoo-0-1-2.dll.a
>> | +-foo.os
>> | +-foo.cpp
>> | +-/bin/g++
>> +-main.cpp
>> +-main.exe
>> | +-main.o
>> | | +-main.cpp
>> | | +-foo.hpp
>> | | +-/bin/g++
>> | +-/bin/g++
>> +-main.o
>> | +-main.cpp
>> | +-foo.hpp
>> | +-/bin/g++
>> +-SConstruct
>> scons: building terminated because of errors.
>>
>> Could someone help me pls? What is the proper way to write a
>> portable SConstruct file, such that the attached project
>> could build
>> on Most platforms? Do I need a versioned shared libs at
>> all on
>> cygwin? It seems like the SONAME stuff does not apply here?
>>
>> --
>> Paweł Tomulik
>>
>> _______________________________________________
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>>
>>
>>
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>
>
--
Paweł Tomulik
Instytut Techniki Lotniczej i Mechaniki Stosowanej
Politechnika Warszawska
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