[Scons-users] SharedLibrary + SHLIBVERSION and cygwin
Paweł Tomulik
ptomulik at meil.pw.edu.pl
Tue Aug 18 17:11:46 EDT 2015
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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--
Paweł Tomulik
Instytut Techniki Lotniczej i Mechaniki Stosowanej
Politechnika Warszawska
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