[Scons-users] Shared Versioned Libraries Problems

[Jim Russell]

This question concerning issues with versioned shareables is still hanging. 
Maybe it was too complicated or poorly worded in trying to illustrate the
two issues (unnecessary rebuilds and misleading/incorrent behavior on
removal during --clean).  Perhaps I am doing something wrong.

I'd rather get an official ruling, before diving into this myself.

JJRussell
Jim Russell wrote
> I have two problems when building the versioned shared libraries. 
>       a) Unnecessary rebuilds 
>            A rebuild happens immediately after a successful build)
>            This does not happen in non-versioned shareable builds/rebuilds
>       b) The --clean operation is suspicious/wrong
> 
> 
> The details depend on whether the shareable is built in the 'natural'
> directory or whether the shareable target is specified as an absolute
> path.  
> The former happens in either case, but the --clean operation behaves
> differently:
> 
>      a) When building the target in the 'natural directory', 
>          the --clean works as expected,
>          but the messages indicating which files have been removed are
> erroneous
> 
>      b) When building with the target specified as an absolute path, 
>           the messages are erroneous and the --clean is incomplete
> 
> 
> Here is the toy example:
>     example3/
>      |     SConstruct
>      |     pkg/
>      |     |      src/
>      |     |      |   SConscript
>      |     |      |   foo.c
> 
> 
> I) NATURAL BUILD
> The SConstruct file is:
>     env = Environment ()
>     env.SConscript ('pkg/src/SConscript',   variant_dir = 'pkg/build',  
> exports   = 'env',   duplicate  = 0)
> 
> and the SConscript file is:
>     Import ('env')
>     obj = env.SharedObject ('foo.c')
>     so   = env.SharedLibrary (obj, SHLIBVERSION = '1.2.3')
> 
> Building it produces the expected results 
>    > scons -Q
>   gcc -o pkg/build/foo.os -c -fPIC pkg/src/foo.c
>   gcc -o pkg/build/libfoo.so.1.2.3 -shared -Wl,-Bsymbolic
> -Wl,-soname=libfoo.so.1 pkg/build/foo.os
> 
> with the 'pkg/build' directory containing the expected files and links
>     > ls pkg/build
>        foo.os  libfoo.so@  libfoo.so.1@  libfoo.so.1.2.3*
> 
> However, following this with an immediate rebuild produces an unnecessary
> rebuild
>    > scons -Q
>    > gcc -o pkg/build/libfoo.so.1.2.3 -shared -Wl,-Bsymbolic
> -Wl,-soname=libfoo.so.1 pkg/build/foo.os
> 
> ...and, the --clean, even though it does the right thing (i.e. all
> links/files have been removed), has suspicious looking output
>     > scons -Q --clean
>        Removed pkg/build/foo.os
>        Removed pkg/build/libfoo.so.1.2.3    <---  Duplicated 
>        Removed pkg/build/libfoo.so.1.2.3   <---
>        Removed pkg/build/libfoo.so.1
> 
> 
> II) ABSOLUTE TARGET BUILD
> The SConstruct file is unchanged, but the SConscript file is modified to
> specify the target as an absolute path:
>         Import ('env')
>         obj = env.SharedObject ('foo.c')
>         so   = env.SharedLibrary ('#build/libfoo.so', obj, SHLIBVERSION =
> '1.2.3')
> 
> Building:
>   > scons -Q
>   gcc -o pkg/build/foo.os -c -fPIC pkg/src/foo.c
>   gcc -o build/libfoo.so.1.2.3 -shared -Wl,-Bsymbolic
> -Wl,-soname=libfoo.so.1 pkg/build/foo.os
> 
> with the expected files and links:
>     > ls build/
>         libfoo.so@  libfoo.so.1@  libfoo.so.1.2.3*
> 
> However the clean is wrong:
>    > scons -Q --clean
>       Removed pkg/build/foo.os
>       Removed build/libfoo.so.1.2.3
> 
> With the shareable and one link still lingering...
>> ls build/
>     libfoo.so.1@  libfoo.so.1.2.3*
> 
> Note that even the one file (libfoo.so.1.2.3) it claimed to remove is
> still there, while the link 'libfoo.so' has been removed.
> 
> JJRussell
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Dr. James J. Russell
> Stanford Linear Accelerator Center
> 650-926-2583

> russell at .stanford

> 
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