[Scons-users] version 2.5.0 and SHLIBVERSIONFLAGS

[Paweł Tomulik]

W dniu 10.05.2016 o 23:30, Tim Jenness pisze:
> I have a scons package that breaks badly in v2.5.0 on Linux because scons started adding $SHLIBVERSIONFLAGS (which really means “-Wl,Bsymbolic” is added to the g++ link line) to my LoadableModule targets (which happen to be SWIG generated files). I’m definitely not setting SHLIBVERSION and SharedLibraryModule doesn’t have the problem. Is it possible that there is a problem with LoadableModule not correctly working out that there is no shared library version defined? If I clear SHLIBVERSIONFLAGS in my SConstruct file the build works as before.
> 
> Should I file a ticket on this? Am I setting a SHLIBVERSION specifically for LoadableModule without realising it?
> 
> — 
> Tim Jenness
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> 

I can confirm, it's the case :(

The minimal example:

# Sconstruct
env = Environment()
env.LoadableModule('foo', 'foo.c')


The issue exists because env['LDMODULEVERSION'] is initially set to
"$SHLIBVERSION" (non-empty string), but this (non empty string
'$SHLIBVERSION') is not correctly handled by a function called
__libversionflags in SCons/Defaults.py (the variable is not
substituted). This is a bug, but fixing it shouldn't be hard.


A quick workaround may consist of overwritting env['__libversionflags']
as follows:


def __libversionflags(env, version_var, flags_var):
  try:
    if env.subst('$'+version_var):
      return env[flags_var]
  except KeyError:
    pass
  return None

env = Environment(__libversionflags = __libversionflags)
env.LoadableModule('foo', 'foo.c')


Similar fixed implementation of __libversionflags should go to
Defaults.py to fix the bug.

Best regards!
-- 
Pawel Tomulik