Export Compile Command Issue | Can't Find Headers

[utsur0]

I'm a bit new to CMake and have been following the Introduction Documentation utilizing the example CMakeLists.txt with its preamble to Fetch this project.

However when adding the option set(CMAKE_EXPORT_COMPILE_COMMANDS ON) inside CMakeLists.txt the resulting compile_commands.json can't find the .hpp files inside ./_deps/ftxui-src/include using clang. This occurs despite the dir being included. I've been researching a solution for hours (maybe I just don't know what I'm looking for 😞 ) my apologies if this is a stupid issue.

SysInfo:
macOS: 12.0.1
clang version: 13.0.1 (Homebrew | Target: arm64-apple-darwin21.1.0)
cmake version: 3.23.1

CMakeLists.txt

Haven't changed much aside from the tag and adding the flag. Also my main.cpp is an example from the documentation.

cmake_minimum_required (VERSION 3.11)

# --- Fetch FTXUI --------------------------------------------------------------
include(FetchContent)

set(FETCHCONTENT_UPDATES_DISCONNECTED TRUE)
FetchContent_Declare(ftxui
 GIT_REPOSITORY https://github.com/ArthurSonzogni/ftxui
 GIT_TAG v2.0.0
)

FetchContent_GetProperties(ftxui)
if(NOT ftxui_POPULATED)
 FetchContent_Populate(ftxui)
 add_subdirectory(${ftxui_SOURCE_DIR} ${ftxui_BINARY_DIR} EXCLUDE_FROM_ALL)
endif()

# ------------------------------------------------------------------------------

project(tui
 LANGUAGES CXX
 VERSION 1.0.0
)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON) 
add_executable(tui src/main.cpp)
target_include_directories(tui PRIVATE src)

target_link_libraries(tui
 PRIVATE ftxui::screen
 PRIVATE ftxui::dom
 PRIVATE ftxui::component # Not needed for this example.
)

compile_commands.json

[
{
"directory": "/Volumes/OS/Volumes/OS/Users/winter/Development/TUI",
"command": "/Library/Developer/CommandLineTools/usr/bin/c++  -I/Volumes/OS/Users/winter/Development/TUI/src -I/Volumes/OS/Volumes/OS/Users/winter/Development/TUI/_deps/ftxui-src/include  -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX12.3.sdk -mmacosx-version-min=12.0 -std=gnu++17 -o CMakeFiles/tui.dir/src/main.cpp.o -c /Volumes/OS/Volumes/OS/Users/winter/Development/TUI/src/main.cpp",
"file": "/Volumes/OS/Volumes/OS/Users/winter/Development/TUI/src/main.cpp"
}
]

Is it because of firmlinks on macOS? CMake issue? Clang Issue? Did I configure something wrong? Think I've been chasing rabbits.

If anymore information is needed please let me know and I'll update! Thanks!

[ArthurSonzogni]

I tried your CMakeLists.txt on Linux: I was able to compile and execute "tui".

I got compile_commands.json similar to yours:

[
{
  "directory": "/tmp/test/build",
  "command": "/usr/bin/c++   -I/tmp/test/src -I/tmp/test/build/_deps/ftxui-src/include    -std=gnu++17 -o CMakeFiles/tui.dir/src/main.cpp.o -c /tmp/test/src/main.cpp",
  "file": "/tmp/test/src/main.cpp"
}
]

If I execute the command from an empty directory, I get:

/usr/bin/c++   -I/tmp/test/src -I/tmp/test/build/_deps/ftxui-src/include    -std=gnu++17 -o CMakeFiles/tui.dir/src/main.cpp.o -c /tmp/test/src/main.cpp
/tmp/test/src/main.cpp:3:10: fatal error: ftxui/dom/elements.hpp: Aucun fichier ou dossier de ce type
    3 | #include "ftxui/dom/elements.hpp"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

However, if I execute the command from a directory, where "cmake" has been called, the commands works.
It is because the "_deps/ftxui-src" directory is fetched by cmake.

Does this resolve your issue?

[utsur0]

Oddly I was executing it from the dir I ran cmake in. I'll mark this a resolved because clang is finicky with its resolutions. I hate to admit—resetting the PC fixed my issue. Gotta assume clang was grabbing the wrong compile_commands.json despite me explicitly setting it within my IDE. Why? I'm not too sure—probably an issue with that program.

Anyways I deleted my other configured .json's, restarted, and then it worked.
Doubt this will be a problem or solution for many others so...my apologies.