Cannot build in CMake with FetchContent

[Gabriele Baldoni]

Hi all,

I'm experiencing some issue when trying to use protobuf within CMake with fetch content when building/generating.

I got this error:
/root/example/car-pub/build/_deps/protobuf-src/src/google/protobuf/stubs/common.h:44:10: fatal error: absl/strings/string_view.h: No such file or directory
   44 | #include "absl/strings/string_view.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here my CMakeLists.txt

cmake_minimum_required(VERSION 3.20)
include(FetchContent)

set(CMAKE_BUILD_TYPE Debug)

project(
  car-pub
  LANGUAGES C CXX)


# set(PROTOC protoc)
set(CMAKE_CXX_STANDARD 17)

FetchContent_Declare(
    argparse
    GIT_REPOSITORY https://github.com/p-ranav/argparse.git
)
FetchContent_MakeAvailable(argparse)

FetchContent_Declare(
    Protobuf
    GIT_REPOSITORY https://github.com/protocolbuffers/protobuf
    GIT_TAG        v22.0
)
FetchContent_MakeAvailable(Protobuf)
FetchContent_GetProperties(Protobuf SOURCE_DIR Protobuf_SOURCE_DIR)
FetchContent_GetProperties(Protobuf INCLUDE_DIRS Protobuf_INCLUDE_DIRS)
include(${Protobuf_SOURCE_DIR}/cmake/protobuf-generate.cmake)

include_directories(
    ${Protobuf_SOURCE_DIR}/src
    ${Protobuf_SOURCE_DIR}/third_party/abseil-cpp/absl
    ${Protobuf_SOURCE_DIR}/third_party/googletest/googletest/include
    ${Protobuf_SOURCE_DIR}/third_party/googletest/googlemock/include
    ${Protobuf_SOURCE_DIR}/third_party/jsoncpp/include
)

add_library(vss
    OBJECT
    ${CMAKE_SOURCE_DIR}/proto/vss_rel_4.0-develop.proto
)
target_link_libraries(vss PRIVATE Protobuf)

target_include_directories(
  vss PUBLIC
    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/proto>
    $<INSTALL_INTERFACE:include>
    ${INCLUDE_DIRECTORIES}
)
file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/proto)
protobuf_generate(
    TARGET vss
    LANGUAGE cpp
    IMPORT_DIRS  ${CMAKE_SOURCE_DIR}/proto
    PROTOC_OUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/proto
    )



add_executable(publisher "src/pub.cpp")
target_link_libraries(publisher PRIVATE argparse vss)


Any suggestion?

[Adam Cozzette]

I think the include directory ${Protobuf_SOURCE_DIR}/third_party/abseil-cpp/absl should be just  ${Protobuf_SOURCE_DIR}/third_party/abseil-cpp.

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[Gabriele Baldoni]

Right, what a stupid error, thanks for spotting this.