I'm using an Ubuntu virtual machine and am encountering the following error message when running the 'make' command:
Scanning dependencies of target AIToolboxMDP
[ 1%] Building CXX object src/CMakeFiles/AIToolboxMDP.dir/Impl/Seeder.cpp.o
[ 1%] Building CXX object src/CMakeFiles/AIToolboxMDP.dir/Impl/CassandraParser.cpp.o
In file included from /home/ben/AI/AI-Toolbox-master/include/AIToolbox/Impl/CassandraParser.hpp:4,
from /home/ben/AI/AI-Toolbox-master/src/Impl/CassandraParser.cpp:1:
/home/ben/AI/AI-Toolbox-master/include/AIToolbox/Types.hpp:7:10: fatal error: boost/multi_array.hpp: No such file or directory
7 | #include <boost/multi_array.hpp>
| ^~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [src/CMakeFiles/AIToolboxMDP.dir/build.make:76: src/CMakeFiles/AIToolboxMDP.dir/Impl/CassandraParser.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:1140: src/CMakeFiles/AIToolboxMDP.dir/all] Error 2
make: *** [Makefile:95: all] Error 2
I ran cmake right before make, and cmake was able to find Boost; I can also see that the multi_array.hpp file is in the folder /home/ben/AI/boost_1_77_0/boost, so I'm not sure why make can't find the file. I tried adding variations of the line target_link_libraries(program ${Boost_LIBRARIES}) into the CMakeLists.txt file and using variations of the -L/-l options with the make call, and neither method worked (although I wasn't sure which program name to use with target_link_libraries so I tried a bunch of guesses but maybe I didn't use the right one; I'm trying to build AI-Toolbox if that helps).
I also have to add several options to the cmake command I run right before make in order to get rid of any errors with that; here's what I enter in case that would do anything or if I need to add something else in there:
cmake .. -DBOOST_ROOT=/home/ben/AI/boost_1_77_0 -DLPSOLVE_INCLUDE_PATH=/home/ben/AI/lpsolve -DVCPKG_TARGET_TRIPLET=x64-linux -DCMAKE_TOOLCHAIN_FILE=/home/ben/AI/vcpkg/scripts/buildsystems/vcpkg.cmake
My CMakeLists.txt file contains the following lines (among others, but these seem like the most relevant) just in case that helps as well:
find_package(Boost ${BOOST_VERSION_REQUIRED} REQUIRED)
include_directories(SYSTEM ${Boost_INCLUDE_DIRS})
Would anyone have any ideas as to how I can get past the make error?
I ended up solving it by deleting my Boost folder and reinstalling it using the command sudo apt-get install libboost-all-dev; I just reran cmake and took out all the options I had been using except for the lpsolve one, and then when I ran make afterward I encountered no issues.
Related
I am using CLion as an IDE. When I create a project a main.cpp is automatically added. I would like to add 30-40 cpp files in a project and keep them as one project. Basically, I just wanna create many .cpp files in one folder and make CLion run them. I can do this in Pycharm by simply creating a project and add as many .py files as I want. But when I want to do this on CLion I got an error. Is it possible to add many .cpp files in a project in CLion, if yes, how can I do that?
An error could be seen in the below. I added a second.cpp to the project and run and this error message appears.
====================[ Build | trial | Debug ]===================================
/Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake --build /Users/mertsaner/CLionProjects/trial/cmake-build-debug --target trial -- -j 6
Scanning dependencies of target trial
[ 66%] Building CXX object CMakeFiles/trial.dir/main.cpp.o
[ 66%] Building CXX object CMakeFiles/trial.dir/second.cpp.o
[100%] Linking CXX executable trial
duplicate symbol '_main' in:
CMakeFiles/trial.dir/main.cpp.o
CMakeFiles/trial.dir/second.cpp.o
ld: 1 duplicate symbol for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [trial] Error 1
make[2]: *** [CMakeFiles/trial.dir/all] Error 2
make[1]: *** [CMakeFiles/trial.dir/rule] Error 2
make: *** [trial] Error 2
Clion uses Cmake. If you want to create multiple executable files for eg with names (ex1.cpp, ex2.cpp. ex3.cpp) in one directory, you will do something like this in the CMake file of your directory.
cmake_minimum_required(VERSION 3.18)
project(some_project)
set(CMAKE_CXX_STANDARD 20)
add_executable(executable1 ex1.cpp)
add_executable(executable2 ex2.cpp)
add_executable(executable3 ex3.cpp)
and so on..
I am currently learning CMake. Right now I am trying to configure CMake to build an example program to learn the basics, but I can't get past what seems like something that should be really easy. It seems that CMake does not agree with my gcc and g++ compilers. I have installed them through CodeBlocks, and they work fine there. However, when I go to configure a project in the CMake GUI I get the following:
The C compiler identification is unknown
The CXX compiler identification is unknown
Check for working C compiler: C:/CodeBlocks/MinGW/bin/gcc.exe
Check for working C compiler: C:/CodeBlocks/MinGW/bin/gcc.exe -- broken
CMake Error at C:/Program Files/CMake/share/cmake-3.15/Modules/CMakeTestCCompiler.cmake:60 (message):
The C compiler
"C:/CodeBlocks/MinGW/bin/gcc.exe"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: C:/Users/Bank/Desktop/Introductions-to-Libraries-with-CMake/Build/CMakeFiles/CMakeTmp
Run Build Command(s):C:/MinGW/bin/mingw32-make.exe cmTC_52744/fast && C:/MinGW/bin/mingw32-make.exe -f CMakeFiles\cmTC_52744.dir\build.make CMakeFiles/cmTC_52744.dir/build
mingw32-make.exe[1]: Entering directory 'C:/Users/Bank/Desktop/Introductions-to-Libraries-with-CMake/Build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_52744.dir/testCCompiler.c.obj
C:\CodeBlocks\MinGW\bin\gcc.exe -o CMakeFiles\cmTC_52744.dir\testCCompiler.c.obj -c C:\Users\Bank\Desktop\Introductions-to-Libraries-with-CMake\Build\CMakeFiles\CMakeTmp\testCCompiler.c
CMakeFiles\cmTC_52744.dir\build.make:64: recipe for target 'CMakeFiles/cmTC_52744.dir/testCCompiler.c.obj' failed
mingw32-make.exe[1]: *** [CMakeFiles/cmTC_52744.dir/testCCompiler.c.obj] Error 1
mingw32-make.exe[1]: Leaving directory 'C:/Users/Bank/Desktop/Introductions-to-Libraries-with-CMake/Build/CMakeFiles/CMakeTmp'
Makefile:120: recipe for target 'cmTC_52744/fast' failed
mingw32-make.exe: *** [cmTC_52744/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:6 (project)
Configuring incomplete, errors occurred!
See also "C:/Users/Bank/Desktop/Introductions-to-Libraries-with-CMake/Build/CMakeFiles/CMakeOutput.log".
See also "C:/Users/Bank/Desktop/Introductions-to-Libraries-with-CMake/Build/CMakeFiles/CMakeError.log".
Here is my CMakeLists file:
cmake_minimum_required(VERSION 3.0.0)
set(CMAKE_C_COMPILER "C:/CodeBlocks/MinGW/bin/gcc.exe")
set(CMAKE_CXX_COMPILER "C:/CodeBlocks/MinGW/bin/g++.exe")
project("Foo")
add_subdirectory("foo")
And if it helps, here is what the Path variable in my Environment Variables looks like:
C:\Program Files (x86)\Common Files\Oracle\Java\javapath;c:\windows\system32;c:\windows;c:\windows\system32\wbem;c:\windows\system32\windowspowershell\v1.0\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\Git;C:\Program Files\Git\cmd;C:\Users\Bank\AppData\Local\Android\Sdk\tools;C:\Users\Bank\AppData\Local\Android\Sdk\platform-tools;C:\Users\Bank\Desktop\sfAnd\android-ndk-r20;C:\Program Files\CMake\bin;C:\Program Files\Java\jdk1.8.0_231;C:\MinGW\msys\1.0\bin;C:\Program Files\Java\jdk1.8.0_231\jre;C:\Gradle\gradle-6.0-all\gradle-6.0\bin;C:\Gradle\gradle-6.0-all\gradle-6.0;C:\Program Files (x86)\GnuWin32\bin;I:\Storage\Programs\apache-ant-1.9.14-bin\apache-ant-1.9.14\bin;C:\Python27;C:\ninja-win;C:\Program Files\dotnet\;C:\CodeBlocks\MinGW
What could the problem be?
C:\CodeBlocks\MinGW probably doesn't contain the DLL's to gcc or g++. You should add C:\CodeBlocks\MinGW\bin and/or C:\CodeBlocks\MinGW\lib to your path instead, depending on how MinGW was installed. I use MSys2 and use the provided environment for 32bit and 64bit tools. I try to get rid of the pre-packaged versions of MinGW to avoid confusion on my own computers (I noticed msys 1.0 in your path).
I figured it out, finally, thanks to this post:
Cmake build error for c++
I read some posts that said "[your_path]\MinGW" needed to be in your PATH variable, but it's actually "[your_path]\MinGW\bin." I am still not sure why adding the following in CMakeLists did not work:
set(CMAKE_C_COMPILER "C:/CodeBlocks/MinGW/bin/gcc.exe")
set(CMAKE_CXX_COMPILER "C:/CodeBlocks/MinGW/bin/g++.exe")
but that's for another time. Thank you for your help.
I use as the main directory one called CLionProjects, on it I have several directories. Recently I added those directories so to organize my files. I used since the first time I installed CLion a directory called "Boletin1" that it's inside the main directory, later when I created "Boletin2" (In these directories I have the projects called Ejercicio1, Ejercicio2 and so on) the problems started showing up, I get this error message:
I got to make clear that the compiler problem is only on "Boletin2" directory and the one called "Boletin1" works alright.
I type the debug:
"C:\Program Files\JetBrains\Nueva carpeta\CLion 2020.2.3\bin\cmake\win\bin\cmake.exe" -DCMAKE_BUILD_TYPE=Debug -G "CodeBlocks - MinGW Makefiles" C:\Users\usuario\Desktop\CLionProjects\Boletín2\Ejercicio1
-- The C compiler identification is GNU 8.1.0
-- Check for working C compiler: C:/mingw64/bin/gcc.exe
-- Check for working C compiler: C:/mingw64/bin/gcc.exe - broken
CMake Error at C:/Program Files/JetBrains/Nueva carpeta/CLion 2020.2.3/bin/cmake/win/share/cmake-3.17/Modules/CMakeTestCCompiler.cmake:60 (message):
The C compiler
"C:/mingw64/bin/gcc.exe"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: C:/Users/usuario/Desktop/CLionProjects/BoletÃn2/Ejercicio1/cmake-build-debug/CMakeFiles/CMakeTmp
Run Build Command(s):C:/mingw64/bin/mingw32-make.exe cmTC_a9874/fast && C:/mingw64/bin/mingw32-make.exe -f CMakeFiles\cmTC_a9874.dir\build.make CMakeFiles/cmTC_a9874.dir/build
mingw32-make.exe[1]: Entering directory 'C:/Users/usuario/Desktop/CLionProjects/Bolet�n2/Ejercicio1/cmake-build-debug/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_a9874.dir/testCCompiler.c.obj
C:\mingw64\bin\gcc.exe -o CMakeFiles\cmTC_a9874.dir\testCCompiler.c.obj -c C:\Users\usuario\Desktop\CLionProjects\Boletín2\Ejercicio1\cmake-build-debug\CMakeFiles\CMakeTmp\testCCompiler.c
gcc.exe: error: C:\Users\usuario\Desktop\CLionProjects\Boletín2\Ejercicio1\cmake-build-debug\CMakeFiles\CMakeTmp\testCCompiler.c: No such file or directory
gcc.exe: fatal error: no input files
compilation terminated.
mingw32-make.exe[1]: *** [CMakeFiles\cmTC_a9874.dir\build.make:85: CMakeFiles/cmTC_a9874.dir/testCCompiler.c.obj] Error 1
mingw32-make.exe[1]: Leaving directory 'C:/Users/usuario/Desktop/CLionProjects/Bolet�n2/Ejercicio1/cmake-build-debug/CMakeFiles/CMakeTmp'
mingw32-make.exe: *** [Makefile:140: cmTC_a9874/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:2 (project)
-- Configuring incomplete, errors occurred!
See also "C:/Users/usuario/Desktop/CLionProjects/BoletÃn2/Ejercicio1/cmake-build-debug/CMakeFiles/CMakeOutput.log".
See also "C:/Users/usuario/Desktop/CLionProjects/BoletÃn2/Ejercicio1/cmake-build-debug/CMakeFiles/CMakeError.log".
[Failed to reload]
Thanks 4 the support or even reading this.
Try to rename your directory to Boletin1 and Boletin2
REMOVE ALL ACCENTS and write it with the boring i letter, even if the spelling is then wrong in your language.
This is an encoding problem and it occurs because in this case you have 3 programs (here cmake, gcc.exe and mingw64-make.exe) that parse the same character with different results (which are BoletÃ�n2, Boletín2 and BoletÃn2).
You might also have to reset clion's cache and/or remove projects from the IDE and re-import them. It may have kept some path in cache and might try to feed them to cmake.
I've been following the official building guide provided here. I need MLT to create a video player and I opted to only install the first 4 libraries, as stated on the guide (FFmpeg, SDL, dlfcn-win32, and libXML). I'm also using QT as my main framework for my application.
I'm a bit confused as far as this guide goes because I find the instructions for where the libraries should go a bit confusing. This is my current folder structure:
$HOME = C:\MinGW\msys\1.0\home\TKB (TKB is my user)
$HOME/build/lib -> libraries
$HOME/build/bin -> binaries
$HOME/build/include -> includes
$HOME/build/share/ffmpeg -> for the "presets" folder
At the same time, because I was confused, I have the same folders (bin, lib, include, share) inside $HOME/.
Then I have $HOME/src/mlt with the mlt files.
When I run the configure command I get this (I disabled the libraries I didn't install to reduce the output on the console):
Command: ./configure --prefix=$HOME/build --target-os=MinGW --enable-gpl --disable-decklink --disable-frei0r --disable-gtk2 --disable-sox --disable-jackrack --disable-swfdec --disable-resample
Configuring framework:
Configuring modules:
Configuring modules/avformat:
- libavformat not found: disabling
Configuring modules/core:
Configuring modules/feeds:
Configuring modules/kdenlive:
Configuring modules/linsys:
- does not build on OS X or Windows:disabling
Configuring modules/lumas:
Configuring modules/motion_est:
Configuring modules/normalize:
Configuring modules/oldfilm:
Configuring modules/opengl:
- movit not found: disabling
Configuring modules/plus:
Configuring modules/plusgpl:
Configuring modules/qt:
- Libexif not found, disabling exif features (auto rotate)
- Qt not found: disabling
Configuring modules/rtaudio:
Configuring modules/sdl:
Configuring modules/vid.stab:
- vid.stab not found: disabling
Configuring modules/videostab:
Configuring modules/vmfx:
Configuring modules/xine:
Configuring modules/xml:
- xml2 not found: disabling xml module
Configuring mlt++:
Configuring swig:
GPLv2 license used; GPLv3 components disabled
I have ffmpeg and the xml2 libraries on the folders but it looks like the script is not able to find them. I also have QT installed on the default folder and it also doesn't seem to find it.
I tried installing anyway (make all install) and I get the following error:
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: cannot find -ldl
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: cannot find -lpthread
collect2.exe: error: ld returned 1 exit status
make[1]: *** [libmlt-6.dll] Error 1
make[1]: Leaving directory '/home/TKB/src/mlt-0.9.6/src/framework'
make: *** [all] Error 1
Can anyone help me with these errors?
Thank you for your time.
EDIT:
I found out that I made a naming mistake when creating the pkgconfig folder, changing that solved the xml2 not being detected problem. Also, I've added the paths for ffmpeg and qt manually and that also seemed to solve the problem. So now what I get with the configure is the following:
./configure --prefix=/home/TKB/build --enable-gpl --disable-decklink --disable-frei0r --disable-gtk2 --disable-sox --disable-jackrack --disable-swfdec --disable-resample --qt-libdir=C:/Qt/5.3/mingw482_32/lib --qt-includedir=C:/Qt/5.3/mingw482_32/include --avformat-shared=/home/TKB/share/ffmpeg --avformat-static=/home/TKB/bin
Configuring framework:
Configuring modules:
Configuring modules/avformat:
Configuring modules/core:
Configuring modules/feeds:
Configuring modules/kdenlive:
Configuring modules/linsys:
- does not build on OS X or Windows:disabling
Configuring modules/lumas:
Configuring modules/motion_est:
Configuring modules/normalize:
Configuring modules/oldfilm:
Configuring modules/opengl:
- movit not found: disabling
Configuring modules/plus:
Configuring modules/plusgpl:
Configuring modules/qt:
- Libexif not found, disabling exif features (auto rotate)
- Qt version 5.x detected
- Include directory: C:/Qt/5.3/mingw482_32/include
Configuring modules/rtaudio:
Configuring modules/sdl:
Configuring modules/vid.stab:
- vid.stab not found: disabling
Configuring modules/videostab:
Configuring modules/vmfx:
Configuring modules/xine:
Configuring modules/xml:
Configuring mlt++:
Configuring swig:
GPLv2 license used; GPLv3 components disabled
When I run make all install I still get an error, which is the following:
c:/Qt/Tools/mingw482_32/bin/../lib/gcc/i68-w64-mingw32/4.8.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -ldl
collect2.exe: error: ld returned 1 exit status
make[1]: *** [libmlt-6.dll] Error 1
make[1]: Leaving directory '/home/TKB/src/mlt/src/framework'
make: *** [all] Error 1
EDIT2: I have added dlfcn-win32's bin, lib and include to the respective bin, lib and include folders in c:/Qt/Tools/mingw482_32, which solved my problem. Now I am getting a new error, which seems of similar solution but I don't see what -lbz2 is.
The error follows below:
c:/Qt/Tools/mingw482_32/bin/../lib/gcc/i68-w64-mingw32/4.8.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lbz2
collect2.exe: error: ld returned 1 exit status
make[2]: *** [../libmltavformat.dll] Error 1
make[2]: Leaving directory '/home/TKB/src/mlt/src/modules/avformat'
make[1]: *** [all] Error 1
make[1]: Leaving directory '/home/TKB/src/mlt/src/modules'
make: *** [all] Error 1
EDIT3: Right now I'm getting the following error:
After the compile code runs (it generates the .o) I get "undefined reference to 'ffmpeg_function'" in every file of the avformat module. I've noticed that it locates the includes correctly, so the problem must be in finding the libs.
I've noticed that on the config.mak file the LDFLAGS are like this:
LDFLAGS+=-L/home/TKB/bin/libavformat -L/home/TKB/bin/libavcodec -L/home/TKB/bin/libavutil
LDFLAGS+=-L/home/TKB/bin/libswscale
LDFLAGS+=-L/home/TKB/bin/libavdevice
Shouldn't it be -l (lower case) to identify a file instead of a folder? Or is it expecting one folder per lib? Besides the ffmpeg libs are named differently (e.g. avformat-56.dll)
EDIT4: To test things out I have added the following to the config.mak of the avformat module:
LDFLAGS+=-l/home/TKB/bin/avformat-56 -l/home/TKB/bin/avcodec-56 -l/home/TKB/bin/avutil-54
LDFLAGS+=-l/home/TKB/bin/swscale-3
LDFLAGS+=-l/home/TKB/bin/avdevice-56
The previous error disappeared but now I am getting the following one:
c:/Qt/Tools/mingw482_32/bin/../lib/gcc/i68-w64-mingw32/4.8.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lC:/MinGW/mysys/1.0/home/TKB/bin/avformat-56
c:/Qt/Tools/mingw482_32/bin/../lib/gcc/i68-w64-mingw32/4.8.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lC:/MinGW/mysys/1.0/home/TKB/bin/avcodec-56
c:/Qt/Tools/mingw482_32/bin/../lib/gcc/i68-w64-mingw32/4.8.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lC:/MinGW/mysys/1.0/home/TKB/bin/avutil-54
c:/Qt/Tools/mingw482_32/bin/../lib/gcc/i68-w64-mingw32/4.8.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lC:/MinGW/mysys/1.0/home/TKB/bin/swscale-3
c:/Qt/Tools/mingw482_32/bin/../lib/gcc/i68-w64-mingw32/4.8.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lC:/MinGW/mysys/1.0/home/TKB/bin/avdevice-56
collect2.exe: error: ld returned 1 exit status
make[2]: *** [../libmltavformat.dll] Error 1
make[2]: Leaving directory '/home/TKB/src/mlt/src/modules/avformat'
make[1]: *** [all] Error 1
make[1]: Leaving directory '/home/TKB/src/mlt/src/modules'
make: *** [all] Error 1
The dlls are on that folder.
EDIT5: It seems I finally managed to compile! I changed the LDFLAGS to the following:
LDFLAGS+=-L/home/TKB/bin
LDFLAGS+=-lavformat-56 -lavcodec-56 -lavutil-54
LDFLAGS+=-lswscale-3
LDFLAGS+=-lavdevice-56
And it finished without errors.
Thank you Brian for all the time and help you gave me!
Make sure you have pkg-config installed:
http://www.mltframework.org/pub/Shotcut/SetupWindowsDev/pkg-config.exe
You should be able to run pkg-config from the command line and get a good response. e.g:
# pkg-config --modversion libxml-2.0
2.9.1
# pkg-config --modversion QtGui
4.8.6
If you don't get a good response from pkg-config, you may need to set PKG_CONFIG_PATH to point at the .pc files for each of the dependencies.
Also, have a good look at the pkg-config documentation. There are some special considerations you may need to make for Windows:
http://linux.die.net/man/1/pkg-config
You also need to install dlfcn-win32. From the MLT Windows instructions:
Download dlfcn-win32
cd ~/src/dlfcn-win32-r19
./configure --enable-shared make all install
To make this redistributable, copy /mingw/bin/libdl.dll to your build directory.
If you did follow those instructions, perhaps you need to find a place to put libdl.dll so that the linker finds it.
For the "-lbz2" error, it looks like you need to download, compile and install the bzip2 library to match the one that ffmpeg was compiled against:
bzip2 1.0.6
Have a look at the README.txt file that came with the ffmpeg-shared package you downloaded. There is a long list of external libraries that ffmpeg was compiled against. bzip2 is the first one. You might need to download/compile/install more of those.
EDIT 3:
You should not specify both --avformat-shared and --avformat-static - they are mutually exclusive. You could try specifying neither of them. Or, try setting --avformat-shared=$HOME/build/
EDIT 4:
I think the reason that you are having trouble linking is because the Zeranoe builds no longer include pkg-config files (.pc).
http://ffmpeg.zeranoe.com/forum/viewtopic.php?f=7&t=532&hilit=pkg+config
The MLT configure script relies on pkg-config to set the correct linker flags. The MLT configure script could be extended to allow the user to specify the correct linker flags. Until that happens, I think that hacking config.mak (like you did) will be the only way to make it work on Windows.
I'm glad you got it to work. Cheers!
So I've got the following CMakeLists.txt file to try and build my main.cpp file.
project(shell)
set(extra_flags = -std=c++11 -Werror -Wall -Wextra)
set(CMAKE_CXX_FLAGS $(CMAKE_CXX_FLAGS) $(extra_flags))
add_executable(shell main.cpp)
At this point, I am just trying to build it with a Hello World program just to make sure everything works. But the flags are there for the rest of the program that I need to write. The actual process of calling cmake . works just fine, but when I use make I get the following error:
[100%] Building CXX object CMakeFiles/shell.dir/main.cpp.o
c++: fatal error: no input files
compilation terminated.
/bin/sh: 1: -o: not found
CMakeFiles/shell.dir/build.make:54: recipe for target 'CMakeFiles/shell.dir/main.cpp.o' failed
make[2]: *** [CMakeFiles/shell.dir/main.cpp.o] Error 127
CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/shell.dir/all' failed
make[1]: *** [CMakeFiles/shell.dir/all] Error 2
Makefile:72: recipe for target 'all' failed
make: *** [all] Error 2
I'm new to Ubuntu and the command line, so any help would be greatly appreciated.
Make sure you use curly brackets ${} (comment above)
Make sure you delete your CMakeCache.txt if you want a "reset" (comment above)
I also developed the habit to always use set(CMAKE_CXX_FLGAS "${CMAKE_CXX_FLAGS} ${extra_flags}") instead of set(CMAKE_CXX_FLGAS ${CMAKE_CXX_FLAGS} ${extra_flags}) which proved to cause less headache in any of my applications. Try that as well.
Use make VERBOSE=1 to see which commands CMake actually runs. You then can mess with the command directly and see how you get it to work.
If it's just HelloWorld!, try leaving out the -std=c++11 flag (or any flags, really) and see.