No sources given to target main cpp

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[Solved]-Issue regarding CMake Error: No source given to target-C++
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Почему CMake не находит исходники?
No sources given to target main cpp
Почему CMake не находит исходники?

[Solved]-Issue regarding CMake Error: No source given to target-C++

For me (came here from Google), this error occurred when CMake target_sources had only PRIVATE sources, and no PUBLIC sources.

I had to make at least one PUBLIC source file:

target_sources($ PRIVATE External/dbscan.cpp main.cpp )

target_sources($ PRIVATE External/dbscan.cpp PUBLIC main.cpp )

The error says what it means: there are no sources for libraries.

#adding entries for lib_third_party_ti_mmcsdlib include_directories("$/lib/third_party/ti/mmcsdlib") include_directories("$/lib/third_party/ti/mmcsdlib/include") add_library(lib_third_party_ti_mmcsdlib "") # NO SOURCES HERE. target_compile_definitions(lib_third_party_ti_mmcsdlib PRIVATE -DBOOT=MMCSD -DCONSOLE=UARTCONSOLE ) subdirs("$/lib/third_party/ti/mmcsdlib") subdirs("$/lib/third_party/ti/mmcsdlib/include")

You should read the docs about add_library in cmake. If you don’t provide any source files, you should declare it as INTERFACE

In this case no compilation target would be generated. Otherwise, you can declare it as IMPORTED , then cmake will not try to create a target for compilation either.

For SHARED , STATIC or OBJECT you always need to supply sources.

You should check ProjectIncludes.cmake for what you really want to do: compile new libs or import them.

Sergey Kolesnik 2432

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Источник

Почему CMake не находит исходники?

Структура проекта:

CMakeLists.txt

cmake_minimum_required(VERSION 3.2) project(2DPrimitive CXX) set(CMAKE_CXX_STANDARD 17) set(CMAKE_CXX_STANDARD_REQUIRED ON) #add_subdirectory(tests/googletest) add_subdirectory(source)

cmake_minimum_required(VERSION 3.2) project(2DPrimitive) set(CMAKE_CXX_STANDARD 17) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(PROJECT_VERSION_MAJOR 0) set(PROJECT_VERSION_MINOR 1) set(SOURCES Point.cpp Window.cpp) set(HEADERS Point.hpp Window.hpp) set(EXTERN_LIBS ExternalDependencies/lib/libglad.a ExternalDependencies/lib/libglfw3.a) add_library(2DPrimitive STATIC $(SOURCES) $(HEADERS)) target_link_libraries(2DPrimitive $) set_target_properties(2DPrimitive PROPERTIES OUTPUT_NAME 2DPrimitive VERSION $.$ SOVERSION $ POSITION_INDEPENDENT_CODE ON FOLDER "../lib/")

CMake Error at source/CMakeLists.txt:23 (add_library): Cannot find source file: $(SOURCES) Tried extensions .c .C .c++ .cc .cpp .cxx .cu .mpp .m .M .mm .ixx .cppm .h .hh .h++ .hm .hpp .hxx .in .txx .f .F .for .f77 .f90 .f95 .f03 .hip .ispc CMake Error at source/CMakeLists.txt:23 (add_library): No SOURCES given to target: 2DPrimitive

Простой 1 комментарий

Во вложенных cmakelists.txt не нужно вновь объявлять проект и свойства компилятора, это все наследуется от вышестоящего листа. Имею ввиду эти строки:

cmake_minimum_required(VERSION 3.2) project(2DPrimitive) set(CMAKE_CXX_STANDARD 17) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(PROJECT_VERSION_MAJOR 0) set(PROJECT_VERSION_MINOR 1)

Возможно проблема связана с этим.

Обычно в головном cmakelists.txt устанавливаются все необходимые глобальные свойства для проекта, типа: версии стандарта, поиск внешних библиотек, дополнительные опции компилятора и т.п.
Во вложенных листах просто определяете соответсвующие цели, используя все то что уже объявлено в вышестоящем листе (и возможно в других вложенных листах).

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