CODEWITHSUNDEEP
c++ccmakecompiler-errorsheader-files
PurpleSpark
PurpleSpark

Reputation: 63

CMake: can't find my header file in a different directory

I have a CMake project with these relevant folders:

project_folder
-src
|--main.c
peripherals
|--something.h
|--something.c

My CMake in project_folder includes:

add_subdirectory(peripherals)

if (NOT $ENV{TARGET_SOURCES} STREQUAL "")
    target_sources(app PRIVATE $ENV{TARGET_SOURCES})
else()
    target_sources(app PRIVATE src/main.c)
endif()

My CMake under peripherals incudes:

add_library (peripherals something.c)

target_include_directories (peripherals PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

CMake under src:

add_executable(app main.c)
target_link_libraries(app PRIVATE peripherals)

My project is building fully but when I try to include my header file in main.c I get:

project_folder/peripherals/something.h:No such file or directory

In my main.c file I have #include "peripherals/something.h". Does anyone know how to fix this? I'm not sure if my #include statement is correct and I think I am missing stuff in my CMakeLists files

Upvotes: 2

Views: 6770

Answers (4)

Ali Forouzan
Ali Forouzan

Reputation: 39

in your CMake in project_folder:

 include_directories(src)

and then in main.c:

#include <peripherals/i2c_test.h>

OR

in your CMake in project_folder:

 include_directories(src/peripherals)

and then in main.c:

#include <i2c_test.h>

Upvotes: 0

Gregor Budweiser
Gregor Budweiser

Reputation: 238

Your include statement has to be relative to the included directory.

Edit: In your example ${CMAKE_CURRENT_SOURCE_DIR} is the project directory (where your CMake file is).

Therefore you should be able to write:

#include <peripherals/something.h>

You can always check a cmake variable's content by printing it. In your CMake file you can write:

message(STATUS ${CMAKE_CURRENT_SOURCE_DIR})

When running cmake you should see the path printed in the console output.

Upvotes: 0

paler123
paler123

Reputation: 976

You'll need to define executable and "link" it with the library:

# project_folder/CMakeLists.txt
add_subdirectory(peripherals)
add_subdirectory(src)


# project_folder/src/CMakeLists.txt
add_executable(my_executable main.c)
target_link_libraries(my_executable PRIVATE peripherals)

Then, you'll need to include the header in main.c properly- since you've linked against a library that includes peripherals directory, you can now directly include it:

#include "something.h"

Upvotes: 2

Waqar
Waqar

Reputation: 9376

You can either do "#include "../peripherals/i2c_test.h" in your main.cpp

OR

in your CMake in project_folder:

 target_include_directories(app ${CMAKE_CURRENT_SOURCE_DIR})

and then in main.c:

#include <peripherals/i2c_test.h>
....

Upvotes: 4

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