Cmake Compiler Issue

Question

I am trying to setup cmake using Windows 10 using MinGW. I have included the path c:/MinGW/bin in my system path and environment path settings. I have removed sh.exe from my path (although, i would love to be able to keep this if possible).

CMakeLists.txt

cmake_minimum_required(VERSION 3.8)

set(CMAKE_C_COMPILER "C:/MinGW/bin/gcc.exe")
set(CMAKE_CXX_COMPILER "C:/MinGW/bin/gcc.exe")

project (Tutorial)
add_executable(Tutorial tutorial.cpp)

Output

C:\School\athabascua\data structures\ass1>cmake -g "MinGW Makefiles" .
-- The C compiler identification is GNU 5.3.0
-- The CXX compiler identification is GNU 5.3.0
-- Check for working C compiler: C:/MinGW/bin/gcc.exe
CMake Error: Generator: execution of make failed. Make command was: "nmake" "/NOLOGO" "cmTC_b3144\fast"
-- Check for working C compiler: C:/MinGW/bin/gcc.exe -- broken
CMake Error at C:/Program Files/CMake/share/cmake-3.8/Modules/CMakeTestCCompiler.cmake:51 (message):
The C compiler "C:/MinGW/bin/gcc.exe" is not able to compile a simple test
program.

It fails with the following output:

Change Dir: C:/School/athabascua/data structures/ass1/CMakeFiles/CMakeTmp



Run Build Command:"nmake" "/NOLOGO" "cmTC_b3144\fast"



Generator: execution of make failed.  Make command was: "nmake" "/NOLOGO"
"cmTC_b3144\fast"

It seems that the GNU compilers are identified but don't seem to work. Any help would be much appreciated. I am trying to avoid using Cygwin.. but almost ready to go that route in a sec here.

It looks like cmake is configured for Microsoft's toolchain, because it's trying to run nmake. — Ben Voigt
– Ben Voigt, Commented May 7, 2017 at 22:22
okay, maybe this is because i'm using Visual Studio Code, i will look into installing nmake. Thanks for the input — SuperVeetz
– SuperVeetz, Commented May 7, 2017 at 22:29
I would rather suggest telling cmake to use GNU make instead of MS nmake. Try cmake -G"MinGW Makefiles" instead of cmake -G"NMake Makefiles" See cmake.org/Wiki/… — Ben Voigt
– Ben Voigt, Commented May 7, 2017 at 22:30
Or in VS Code, set cmake.generator as shown here, but use MinGW Makefiles — Ben Voigt
– Ben Voigt, Commented May 7, 2017 at 22:35
Thank you Ben. It is compiling now. The problem was that I was using cmake -g "MinGW Makefiles" and having a lowercase -g seemed to cause the problem because when I use uppercase -G it works. Good ol windows — SuperVeetz
– SuperVeetz, Commented May 7, 2017 at 22:37

SuperVeetz · Accepted Answer · 2017-05-08 00:15:27Z

5

To fix the problem I was having, I had to do two things.

use the command cmake -G "MinGW Makefiles" . (capital -G on windows)
update my CMakeLists.txt file to use gcc for C compiler and g++ for C++ compiler

CMakeLists.txt

cmake_minimum_required(VERSION 3.8)

set(CMAKE_C_COMPILER "C:/MinGW/bin/gcc.exe")
set(CMAKE_CXX_COMPILER "C:/MinGW/bin/g++.exe")

project (Tutorial)
add_executable(Tutorial tutorial.cpp)

answered May 8, 2017 at 0:15

SuperVeetz

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2 Comments

Ben Voigt Over a year ago

Yeah gcc and g++ both run the same compiler, but with different default options. And for the link step, the files are all named *.o so the filename provides no hint that C++ libraries should be used.

dlasalle Over a year ago

Just FYI, you can avoid setting the variables in the CMakeLists.txt and thus keep your program portable by instead specifying them on the command line -DCMAKE_C_COMPILER="C:/MinGW/bin/gcc.exe" -DCMAKE_CXX_COMPILER="C:/MinGW/bin/g++.exe".

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