[Scons-users] Possible bug with versioned libraries and cache enabled

[Bill Deegan]

Yes. I think this is a bug.
Please file at scons.tigris.org

If you can make a tarball or zip file with your example to demonstrate the
issue.

The bulk of the issue is that when the library is retrieved from the cache,
the symlink(s) is not recreated.

-Bill

On Tue, Feb 14, 2017 at 4:26 AM, Ken Bellock <ken at bellock.net> wrote:

>
> Following up with a suggestion from bdbaddog to post this issue to the
> scons mailing list.
>
> Original StackOverflow Question: http://stackoverflow.com/
> questions/42211926/what-is-the-proper-usage-of-scons-
> with-versioned-libraries-and-the-cache-enabled
>
> When I activate the scons cache on the following minimum working example,
> on linux, if I build, clean, and then build, the second build will break.
> Without the cache, this example works every time.
>
> I have also noticed with the cache turned on, and building just one shared
> versioned library with the cache turned on, if I delete one of the
> symlinks, and then re-run scons, it does not re-create the link, as I would
> expect it to do.
>
> If this is a bug, is there a workaround till a fix is integrated into a
> release?
>
> The following MWE was executed on a Fedora 25, with all updates as of
> 2/11/2017.
>
>
> >> scons --version
> SCons by Steven Knight et al.:
>     script: v2.5.1.rel_2.5.1:3735:9dc6cee5c168[MODIFIED], 2016/11/03
> 14:02:02, by bdbaddog on mongodog
>     engine: v2.5.1.rel_2.5.1:3735:9dc6cee5c168[MODIFIED], 2016/11/03
> 14:02:02, by bdbaddog on mongodog
>     engine path: ['/usr/lib/scons/SCons']
> Copyright (c) 2001 - 2016 The SCons Foundation
>
> >> tree
> .
> ├── bar.cpp
> ├── foo.cpp
> └── SConstruct
>
> 0 directories, 3 files
>
> >> cat bar.cpp
> void bar() {}
>
> >> cat foo.cpp
> void foo() {}
>
> >> cat SConstruct
> CacheDir('cache')
> SharedLibrary('foo.cpp', SHLIBVERSION='1.0.0')
> SharedLibrary('bar.cpp', SHLIBVERSION='1.0.0', LIBS=['foo'], LIBPATH=['.'])
>
> >> scons --cache-debug=-
> scons: Reading SConscript files ...
> scons: done reading SConscript files.
> scons: Building targets ...
> CacheRetrieve(bar.os):  f51aa60a1d1f47f50a872599e2d0039c not in cache
> g++ -o bar.os -c -fPIC bar.cpp
> CachePush(bar.os):  pushing to f51aa60a1d1f47f50a872599e2d0039c
> CacheRetrieve(foo.os):  77ed043971b55f5e85a799d399e1e01a not in cache
> g++ -o foo.os -c -fPIC foo.cpp
> CachePush(foo.os):  pushing to 77ed043971b55f5e85a799d399e1e01a
> CacheRetrieve(libfoo.so.1.0.0):  9d28d253e1e1adfb32090d08cd7cef90 not in
> cache
> g++ -o libfoo.so.1.0.0 -shared -Wl,-Bsymbolic -Wl,-soname=libfoo.so.1
> foo.os
> Create symlinks for: 'libfoo.so.1.0.0': 'libfoo.so.1'->'libfoo.so.1.0.0',
> 'libfoo.so'->'libfoo.so.1.0.0'
> CachePush(libfoo.so.1.0.0):  pushing to 9d28d253e1e1adfb32090d08cd7cef90
> CacheRetrieve(libbar.so.1.0.0):  4cd497b57418be29d85006d10e13e5e8 not in
> cache
> g++ -o libbar.so.1.0.0 -shared -Wl,-Bsymbolic -Wl,-soname=libbar.so.1
> bar.os -L. -lfoo
> Create symlinks for: 'libbar.so.1.0.0': 'libbar.so.1'->'libbar.so.1.0.0',
> 'libbar.so'->'libbar.so.1.0.0'
> CachePush(libbar.so.1.0.0):  pushing to 4cd497b57418be29d85006d10e13e5e8
> scons: done building targets.
>
> >> tree
> .
> ├── bar.cpp
> ├── bar.os
> ├── cache
> │   ├── 4C
> │   │   └── 4cd497b57418be29d85006d10e13e5e8
> │   ├── 77
> │   │   └── 77ed043971b55f5e85a799d399e1e01a
> │   ├── 9D
> │   │   └── 9d28d253e1e1adfb32090d08cd7cef90
> │   ├── config
> │   └── F5
> │       └── f51aa60a1d1f47f50a872599e2d0039c
> ├── foo.cpp
> ├── foo.os
> ├── libbar.so -> libbar.so.1.0.0
> ├── libbar.so.1 -> libbar.so.1.0.0
> ├── libbar.so.1.0.0
> ├── libfoo.so -> libfoo.so.1.0.0
> ├── libfoo.so.1 -> libfoo.so.1.0.0
> ├── libfoo.so.1.0.0
> └── SConstruct
>
> 5 directories, 16 files
>
> >> scons -c
> scons: Reading SConscript files ...
> scons: done reading SConscript files.
> scons: Cleaning targets ...
> Removed bar.os
> Removed foo.os
> Removed libfoo.so.1.0.0
> Removed libfoo.so
> Removed libfoo.so.1
> Removed libbar.so.1.0.0
> Removed libbar.so
> Removed libbar.so.1
> scons: done cleaning targets.
>
> >> tree
> .
> ├── bar.cpp
> ├── cache
> │   ├── 4C
> │   │   └── 4cd497b57418be29d85006d10e13e5e8
> │   ├── 77
> │   │   └── 77ed043971b55f5e85a799d399e1e01a
> │   ├── 9D
> │   │   └── 9d28d253e1e1adfb32090d08cd7cef90
> │   ├── config
> │   └── F5
> │       └── f51aa60a1d1f47f50a872599e2d0039c
> ├── foo.cpp
> └── SConstruct
>
> 5 directories, 8 files
>
> >> scons --cache-debug=-
> scons: Reading SConscript files ...
> scons: done reading SConscript files.
> scons: Building targets ...
> Retrieved `bar.os' from cache
> CacheRetrieve(bar.os):  retrieving from f51aa60a1d1f47f50a872599e2d0039c
> Retrieved `foo.os' from cache
> CacheRetrieve(foo.os):  retrieving from 77ed043971b55f5e85a799d399e1e01a
> Retrieved `libfoo.so.1.0.0' from cache
> CacheRetrieve(libfoo.so.1.0.0):  retrieving from
> 9d28d253e1e1adfb32090d08cd7cef90
> CacheRetrieve(libbar.so.1.0.0):  58ec677dbfc7c655a0cef296b479b485 not in
> cache
> g++ -o libbar.so.1.0.0 -shared -Wl,-Bsymbolic -Wl,-soname=libbar.so.1
> bar.os -L. -lfoo
> /bin/ld: cannot find -lfoo
> collect2: error: ld returned 1 exit status
> scons: *** [libbar.so.1.0.0] Error 1
> scons: building terminated because of errors.
>
> >> tree
> .
> ├── bar.cpp
> ├── bar.os
> ├── cache
> │   ├── 4C
> │   │   └── 4cd497b57418be29d85006d10e13e5e8
> │   ├── 77
> │   │   └── 77ed043971b55f5e85a799d399e1e01a
> │   ├── 9D
> │   │   └── 9d28d253e1e1adfb32090d08cd7cef90
> │   ├── config
> │   └── F5
> │       └── f51aa60a1d1f47f50a872599e2d0039c
> ├── foo.cpp
> ├── foo.os
> ├── libfoo.so.1.0.0
> └── SConstruct
>
> 5 directories, 11 files
>
> Thanks,
> Ken Bellock
>
> _______________________________________________
> Scons-users mailing list
> Scons-users at scons.org
> https://pairlist4.pair.net/mailman/listinfo/scons-users
>
>
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