Protobuf generate relative to package/workdir APPEND_PATH

Code
1

I am having difficulty with the protobuf_generate of FindProtobuf.cmake

in my project

.
├── a
│   ├── b
│   │   ├── c
│   │   │   ├── CMakeLists.txt
│   │   │   └── d.proto
├── e
│   ├── f
│   │   ├── g
│   │   │   ├── CMakeLists.txt
│   │   │   └── h.proto

where a/b/c/CMakeLists.txt

has the following protobuf_generate call:

protobuf_generate(
    TARGET d_tgt
    PROTOC_OUT_DIR ${CMAKE_BINARY_DIR}
    PROTOS d.proto
    IMPORT_DIRS ${CMAKE_SOURCE_DIR}
)

Note that the APPEND_PATH flag is not set

and d.proto contains the include:

import "e/f/g/h.proto";

and the generated protoc call

cd ${CMAKE_BINARY_DIR}/a/b/c && protoc --cpp_out :${CMAKE_BINARY_DIR} -I ${CMAKE_SOURCE_DIR}/a/b/c -I ${CMAKE_SOURCE_DIR} ${CMAKE_SOURCE_DIR}/a/b/c/d.proto

The inclusion of -I ${CMAKE_SOURCE_DIR}/a/b/c as it makes protoc think that module needs descriptor_table_ name of only d, when the linkage in e/f/g/h is expecting an a/b/c/d name.

If the APPEND_PATH flag is not included no additional paths should be included in the invocation of protoc

In the current flow of FindProtobuf.cmake whether the APPEND_PATH flag is set or not, additional include flags get included

Related to: