[Scons-users] Environment clones linked?

[Bill Deegan]

So you're reaching into an Action defined in a builder.
That's pretty far inside the Environment to a level that there's not a deep
copy of it.

This when using mslink right?

shlibLinkAction = SCons.Action.Action('${TEMPFILE("$SHLINK
$SHLINKFLAGS $_SHLINK_TARGETS $_LIBDIRFLAGS $_LIBFLAGS $_PDB
$_SHLINK_SOURCES", "$SHLINKCOMSTR")}', '$SHLINKCOMSTR')

regServerAction = SCons.Action.Action("$REGSVRCOM", "$REGSVRCOMSTR")

embedManifestDllCheckAction = SCons.Action.Action(embedManifestDllCheck, None)

compositeShLinkAction = shlibLinkAction + regServerCheck +
embedManifestDllCheckAction

env['SHLINKCOM']   =  compositeShLinkAction


In this case I'd expect the Clone copy/deep copying logic would yield what
you are seeing.
If you did this:

env2['SHLINKCOM'] = SCons.Action.Action("echo link command env2",None) +
env2['SHLINKCOM'].list[1] + env2['SHLINKCOM'].list[2]

Then it shouldn't modify env1..
-Bill


On Thu, May 24, 2018 at 8:33 PM, Daniel Moody <dmoody256 at gmail.com> wrote:

> I am trying to clone an environment and then make changes to the clone so
> that it is different than the original.
>
> But somehow changing the clone also changes my original env? Is that
> expected behavior?
>
> Below is an example SConstruct which reproduces the issue (SCons 3.01
> installed from pip on windows 10):
>
> env1 = Environment()
> env2 = env1.Clone()
>
> print("env2 before = " + env1['SHLINKCOM'].list[0].cmd_list)
> env2['SHLINKCOM'].list[0].cmd_list = "echo link command env2"
> print("env2 after = " + env1['SHLINKCOM'].list[0].cmd_list)
>
> print("env1 = " + env2['SHLINKCOM'].list[0].cmd_list)
>
> Which produces this output:
>
> C:\Users\Daniel\workspace>scons  -f SConstruct.py
> scons: Reading SConscript files ...
> env2 before = ${TEMPFILE("$SHLINK $SHLINKFLAGS $_SHLINK_TARGETS
> $_LIBDIRFLAGS $_LIBFLAGS $_PDB $_SHLINK_SOURCES", "$SHLINKCOMSTR")}
> env2 after = echo link command env2
> env1 = echo link command env2
> scons: done reading SConscript files.
> scons: Building targets ...
> scons: `.' is up to date.
> scons: done building targets.
>
> Can someone shed some light on if this is a bug or how do I uniquely
> modify the SHLINKCOM?
>
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