yarp_add_idl adds an extra thrift in the include folder

[xEnVrE]

Describe the bug

I have a project to be built using CMake that uses yarp_add_idl to generate thrift cpp and h files.

Specifically, if $ROOT is the root of the sources, I have the thrift file in $ROOT/thrift/<name>.thrift containing some service of the form service <Name>.

Inside the CMakeLists.txt, I have some lines like

set(${EXE_TARGET_NAME}_THRIFT_HDR thrift/<name>.thrift)

yarp_add_idl(${EXE_TARGET_NAME}_THRIFT_SRC ${${EXE_TARGET_NAME}_THRIFT_HDR})

add_executable(${EXE_TARGET_NAME}
               ${${EXE_TARGET_NAME}_HDR}
               ${${EXE_TARGET_NAME}_SRC}
               ${${EXE_TARGET_NAME}_THRIFT_SRC}
)

Within my sources file, I am including the thrift header using #include <thrift/<Name>.h>

Starting from this commit, I cannot compile the project for the following reasons:

1. the header file <Name>.h, within the build folder, is placed in build/src/<project-name>/include/thrift/thrift/ instead of build/src/<project-name>/include/thrift/ as happening in the past
2. the source file <Name>.cpp, that can be found in build/src/<project-name>/src, tries to include thrift/<Name>.h and this fails due to (1)
3. all my sources try to include thrift/<Name>.h and this fails due to (1)

Configuration:

• OS: Ubuntu 18.04
• yarp version: 3.1.101 (this commit)
• compiler: gcc 5.5.0

[drdanz]

Fixed in b15ec0f

[traversaro]

Obviously, this fix broke the code that was assuming that the thrift was indeed in the include folder, see robotology/wearables#56 . : D

Actually that problem seems to be related to another change.