CMake override native compiler flags - cmake

Question

I am trying to build a c project with CMake using Visual Studio 14 however I cannot override the compiler flags being set by CMake which are causing project to fail to build. I am using this method in my CMakeLists.txt file
set(flags /nologo /c /EHsc /GS- /MTd /Od /TC /Zi /Zp2 /D _USING_V110_SDK71_)
set(CMAKE_C_FLAGS ${flags})
set(rc_flags /l0x809)
set(CMAKE_RC_FLAGS ${rc_flags})
set(linker_flags /NOLOGO /SUBSYSTEM:console /MACHINE:I386 /DLL)
set(CMAKE_LINKER_FLAGS ${linker_flags})
Any help would greatly be appreciated!
Edit: full example of main CMakeLists.txt is here
cmake_minimum_required(VERSION 3.4)
project(cuism C)
set(WINDOWS_SDK_INCLUDES "C:/Program Files\ (x86)/Microsoft\ SDKs/Windows/v7.1A/Include/")
set(WINDOWS_SDK_LIBRARIES "C:/Program Files\ (x86)/Microsoft\ SDKs/Windows/v7.1A/Lib")
set(WSOCK "WSock32.lib")
set(ODBC "odbc32.lib")
set(ODBCCP "odbccp32.lib")
set(includeDir "${CMAKE_SOURCE_DIR}/include/")
set(resourceDir "${CMAKE_SOURCE_DIR}/resources/")
include_directories(
${includeDir}
${resourceDir}
)
set(CMAKE_LIBRARY_PATH ${WINDOWS_SDK_LIBRARIES})
set(CMAKE_INCLUDE_PATH ${WINDOWS_SDK_INCLUDES})
set(flags "/nologo /c /EHsc /GS- /MTd /Od /TC /Zi /Zp2 /D _USING_V110_SDK71_" )
set(CMAKE_C_FLAGS ${flags})
set(rc_flags /l0x809)
set(CMAKE_RC_FLAGS ${rc_flags})
set(linker_flags /NOLOGO /SUBSYSTEM:console /DLL)
set(CMAKE_LINKER_FLAGS ${linker_flags})
message(c flags are ${CMAKE_C_FLAGS})
message(rc flags are ${CMAKE_RC_FLAGS})
message(linker flags are ${CMAKE_LINKER_FLAGS})
message(linker EXE flags are ${CMAKE_EXE_LINKER_FLAGS})
set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)
set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)
set(RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
ADD_SUBDIRECTORY(cuimbct)
ADD_SUBDIRECTORY(cuimb)
ADD_SUBDIRECTORY(cuidll)
Each sudbdirectory has a CMakeLists.txt similar to this one
set(src cuimb.c "${includeDir}port.c" cuimben.c cuimb.rc)
add_library(cuimb SHARED ${src})
target_link_libraries(cuimb ${WSOCK} ${ODBC} ${ODBCCP})
Error is during linking stage due to error code LNK2019

Answer 1

I've given your code a try and - with some small modifications - could successfully apply those compiler/linker options. It includes the changes I and #Tsyvarev have suggested (quotes and use of CMAKE_SHARED_LINKER_FLAGS) and I've removed the static references to Windows SDK 7.1. This can be set with the -T toolset option:
> cmake -H"." -B"buildWin7" -T"v140_xp" -G"Visual Studio 14 2015"
...
CMakeLists.txt
cmake_minimum_required(VERSION 3.5)
project(cuism C)
set(includeDir "${CMAKE_SOURCE_DIR}/include/")
set(resourceDir "${CMAKE_SOURCE_DIR}/resources/")
include_directories(
${includeDir}
${resourceDir}
)
set(flags "/nologo /c /EHsc /GS- /MTd /Od /TC /Zi /Zp2" )
set(CMAKE_C_FLAGS "${flags}")
set(rc_flags "/l0x809")
set(CMAKE_RC_FLAGS "${rc_flags}")
set(linker_flags "/NOLOGO /SUBSYSTEM:console /DLL")
set(CMAKE_SHARED_LINKER_FLAGS "${linker_flags}")
set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)
set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)
set(RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
...
cuimb\CMakeLists.txt
...
add_library(cuimb SHARED ${src})
target_link_libraries(cuimb wsock32 odbc32 odbccp32)
Recommendation
To keep your CMake script code clean, you should move all of the compiler/linker options to a toolchain file. And I've added some of the options I have normally defined there. Plus I reduced it to a single configuration MyDebug (just Debug would append other Debug options), because your options don't seem to be made for Release.
> cmake -H"." -B "buildWin7" -DCMAKE_TOOLCHAIN_FILE:PATH="VS2015Toolchain.cmake" -G"Visual Studio 14 2015"
...
VS2015Toolchain.cmake
if (NOT CMAKE_GENERATOR_TOOLSET)
set(CMAKE_GENERATOR_TOOLSET "v140_xp" CACHE INTERNAL "")
endif()
set(CMAKE_CONFIGURATION_TYPES "MyDebug" CACHE INTERNAL "")
# NOTE: Standard is a console app. If you need a windows app,
# use WIN32 define in add_executable
set(CMAKE_WIN32_EXECUTABLE 0 CACHE INTERNAL "")
set(CMAKE_C_FLAGS "/nologo /c /EHsc /GS- /MTd /Od /TC /Zi /Zp2 /W4" CACHE INTERNAL "")
set(CMAKE_RC_FLAGS "/l0x809" CACHE INTERNAL "")
set(
CMAKE_SHARED_LINKER_FLAGS
"/NOLOGO /SAFESEH:NO /INCREMENTAL:NO /debug"
CACHE INTERNAL ""
)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH CACHE INTERNAL "")
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY CACHE INTERNAL "")
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY CACHE INTERNAL "")