So, I have no code, just empty files and a CMake, but I keep getting that Linker Error. Can someone please explain in a lot of detail what my problem is? Some info I have is that I am supposed to be using Visual Studio 2015 as my compiler and stuff, which I think I already have set up.
The Error:
[100%] Linking CXX executable Debug\CinderGame\CinderGame.exe
NMAKE : fatal error U1077: '"C:\Program Files\JetBrains\CLion 2020.2.3\bin\cmake\win\bin\cmake.exe"' : return code '0xffffffff'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\nmake.exe"' : return code '0x2'
Stop.
LINK Pass 1: command "C:\PROGRA~2\MICROS~1.0\VC\bin\link.exe /nologo @CMakeFiles\CinderGame.dir\objects1.rsp /out:Debug\CinderGame\CinderGame.exe /implib:CinderGame.lib /pdb:C:\Users\cesar\Documents\GitHub\final-project-cesarmonsalud\cmake-build-debug\Debug\CinderGame\CinderGame.pdb /version:0.0 /machine:X86 /debug /INCREMENTAL /subsystem:windows /NODEFAULTLIB:LIBCMT /NODEFAULTLIB:LIBCPMT -LIBPATH:C:\Users\cesar\Desktop\cinder_0.9.2_vc2015\lib\msw\x86 C:\Users\cesar\Desktop\cinder_0.9.2_vc2015\lib\msw\x86\Debug\v140\cinder.lib kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTFILE:CMakeFiles\CinderGame.dir/intermediate.manifest CMakeFiles\CinderGame.dir/manifest.res" failed (exit code 1120) with the following output:
LIBCMTD.lib(exe_winmain.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)
Debug\CinderGame\CinderGame.exe : fatal error LNK1120: 1 unresolved externals
The Code:
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
set(CMAKE_CXX_STANDARD 11)
project(Connect4)
# This tells the compiler to not aggressively optimize and
# to include debugging information so that the debugger
# can properly read what's going on.
set(CMAKE_BUILD_TYPE Debug)
# Let's ensure -std=c++xx instead of -std=g++xx
set(CMAKE_CXX_EXTENSIONS OFF)
# Let's nicely support folders in IDE's
set_property(GLOBAL PROPERTY USE_FOLDERS ON)
# Warning flags
if(MSVC)
# warning level 3 and all warnings as errors
add_compile_options(/W3)
else()
# lots of warnings and all warnings as errors
add_compile_options(-Wall -Wpedantic -Werror)
endif()
# FetchContent added in CMake 3.11, downloads during the configure step
include(FetchContent)
# FetchContent_MakeAvailable was not added until CMake 3.14
if(${CMAKE_VERSION} VERSION_LESS 3.14)
include(cmake/add_FetchContent_MakeAvailable.cmake)
endif()
FetchContent_Declare(
catch2
GIT_REPOSITORY https://github.com/catchorg/Catch2.git
GIT_TAG devel
)
# Adds Catch2 testing library
FetchContent_GetProperties(catch2)
if(NOT catch2_POPULATED)
FetchContent_Populate(catch2)
add_library(catch2 INTERFACE )
target_include_directories(catch2 INTERFACE ${catch2_SOURCE_DIR}/single_include)
endif()
get_filename_component(CINDER_PATH "C:/Users/cesar/Desktop/cinder_0.9.2_vc2015" ABSOLUTE)
get_filename_component(APP_PATH "${CMAKE_CURRENT_SOURCE_DIR}/" ABSOLUTE)
include("${CINDER_PATH}/proj/cmake/modules/cinderMakeApp.cmake")
list(APPEND CORE_SOURCE_FILES
)
list(APPEND SOURCE_FILES ${CORE_SOURCE_FILES}
include/core/Connect4.h
include/visualizer/FinalProjectApp.h
src/core/Connect4.cpp
src/visualizer/FinalProjectApp.cpp
)
list(APPEND TEST_FILES tests/Connect4Tests.cpp)
ci_make_app(
APP_NAME CinderGame
CINDER_PATH ${CINDER_PATH}
SOURCES apps/cinder_game.cpp ${SOURCE_FILES}
INCLUDES include
)
ci_make_app(
APP_NAME ConsoleGame
CINDER_PATH ${CINDER_PATH}
SOURCES apps/main_console_game.cpp ${SOURCE_FILES}
INCLUDES include
)
ci_make_app(
APP_NAME GameTest
CINDER_PATH ${CINDER_PATH}
SOURCES tests/Connect4Tests.cpp ${SOURCE_FILES} ${TEST_FILES}
INCLUDES include
LIBRARIES catch2
)
if(MSVC)
set_property(TARGET GameTest APPEND_STRING PROPERTY LINK_FLAGS " /SUBSYSTEM:CONSOLE")
endif()
The culprit is probably:
if(MSVC)
set_property(TARGET GameTest APPEND_STRING PROPERTY LINK_FLAGS " /SUBSYSTEM:CONSOLE")
endif()
This tells the linker to build for a console subsystem, which does not have an implicit WinMain function: you'd have to write one yourself if you need a console build.
If you don't need a console build, you can change it to /SUBSYSTEM:WINDOWS
and a WinMain will be supplied by MFC.
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