`TAO::TAO_CO_THRU_POA_STRATEGY` bit missing from `CosEventChannelAdmin::EventChannel->for_suppliers()`, causing it to throw CORBA system exception

[alexchandel]

Version

ACE: 7.0.11, TAO: 3.0.11 (and others)

Host machine and operating system

Occurs on all attempted builds (Windows and macOS).

Compiler name and version (including patch level)

Apple clang version 14.0.3 (clang-1403.0.22.14.1) and VS 2022

The $ACE_ROOT/ace/config.h file

ace/config-windows.h or ace/config-macosx-mojave.h

The $ACE_ROOT/include/makeinclude/platform_macros.GNU file

None. (Using CMake build)

Contents of $ACE_ROOT/bin/MakeProjectCreator/config/default.features

None.

AREA/CLASS/EXAMPLE AFFECTED:

CosEventChannelAdmin::EventChannel and possibly other generated client code.

The problem effects:

Runtime.

Synopsis

Invoking ->for_suppliers() on a CosEventChannelAdmin::EventChannel results in an internal system exception.

Description

When using ACE+TAO built with CMake, invoking ->for_suppliers() on a CosEventChannelAdmin::EventChannel results in an internal system exception. This is because the TAO::TAO_CO_THRU_POA_STRATEGY bit is not passed to the TAO::Invocation_Adapter constructor within the source implementation of that function (CosEventChannelAdminC.cpp).

  TAO::Invocation_Adapter _invocation_call (
      this,
      _the_tao_operation_signature,
      1,
      "for_suppliers",
      13,
      TAO::TAO_CO_NONE,
      TAO::TAO_TWOWAY_INVOCATION
      ,
      TAO::TAO_SYNCHRONOUS_INVOCATION,
      false
    );

However, when built with the "full source distribution" with build files already present, the Invocation_Adapter is constructed with the TAO::TAO_CO_THRU_POA_STRATEGY bit, as follows:

  TAO::Invocation_Adapter _invocation_call (
      this,
      _the_tao_operation_signature,
      1,
      "for_suppliers",
      13,
      TAO::TAO_CO_NONE | TAO::TAO_CO_THRU_POA_STRATEGY,
      TAO::TAO_TWOWAY_INVOCATION
      ,
      TAO::TAO_SYNCHRONOUS_INVOCATION,
      false
    );

What causes this bit to be missing?

[alexchandel]

Some investigation finds " | TAO::TAO_CO_THRU_POA_STRATEGY" is emitted in be_visitor_operation_ami_cs::visit_operation and be_visitor_operation::gen_stub_operation_body, when be_global->gen_thru_poa_collocation() is set.

This defaults to true, but can also be set true and false by the strings -Gp and -Sp in char **av.

[alexchandel]

It appears the problem was this line (now this line), taken from OpenDDS/cmake/tao_idl_sources.cmake. Disabling default behavior without a flag is quite confusing.

[jwillemsen]

OpenDDS only uses a subset of TAO, so they disabled some features. Looks you found the flags that control this.