TriKota: Build errors with Dakota 6.8 and newer

Created by: briadam

@trilinos/trikota

Expectations

Trilinos should work when TriKota is enabled with Dakota 6.8 and newer.

Current Behavior

Build fails due to Dakota not being able to find ROL headers. (Dakota now has an optional dependence on ROL)

Motivation and Context

Trying to verify that recent changes in Dakota will not break TriKota users of Dakota.

Definition of Done

Enabling TriKota should build and test with Dakota 6.8 or newer.

Possible Solution

Ideally, want to allow TriKota/Dakota to use Trilinos ROL, however, this results in a circular dependency because ROL has an optional dependence on TriKota. For now, recommend workaround where Dakota's ROL is disabled when building under TriKota.

Steps to Reproduce

Clone Trilinos, checkout devel, place Dakota in trilinos/packages/TriKota/Dakota. Configure Trilinos with TriKota enabled, get build error at make time.

Your Environment

Relevant repo SHA1s: Trilinos master at 4f15e6fb
Relevant configure flags or configure script:

cmake \
-DCMAKE_BUILD_TYPE=RELEASE \
-DCMAKE_INSTALL_PREFIX=../install \
-DBUILD_SHARED_LIBS:BOOL=TRUE \
-DTrilinos_ENABLE_TESTS:BOOL=ON \
-DTrilinos_ENABLE_Teuchos:BOOL=ON \
-DTrilinos_ENABLE_ROL:BOOL=ON \
-DTrilinos_ENABLE_TriKota:BOOL=ON \
-DTrilinos_ENABLE_ALL_PACKAGES:BOOL=OFF \
-DTrilinos_ENABLE_ALL_FORWARD_DEP_PACKAGES:BOOL=OFF \
-DTrilinos_ENABLE_ALL_OPTIONAL_PACKAGES:BOOL=ON \
-DTrilinos_ENABLE_COMPLEX_DOUBLE:BOOL=ON \
../source

Operating system and version: RHEL 7.6
Compiler and TPL versions: Default RHEL7 toolchain (gcc-4.8.5) and TPLs