I downloaded opencv from here and extracted it to /home/XXXX/Documents/opencv-4.4.0.
I want to link it to Eclipse. So I did this -
In the project settings -> GCC C++ Compiler -> include path I gave /home/XXXX/Documents/opencv-4.4.0.
Then in the linker section I added the libraries and set the library search path to /home/XXXX/Documents/opencv-4.4.0 and even /home/XXXX/Documents/opencv-4.4.0/include.
When I build the project, I get this error -
18:50:10 **** Incremental Build of configuration Debug for project displayImage ****
make all
Building file: ../src/displayIMage.cpp
Invoking: GCC C++ Compiler
g++ -I/home/XXXX/Documents/opencv-4.4.0 -I/home/XXXX/Documents/opencv-4.4.0/include -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/displayIMage.d" -MT"src/displayIMage.o" -o "src/displayIMage.o" "../src/displayIMage.cpp"
In file included from ../src/displayIMage.cpp:1:
/home/XXXX/Documents/opencv-4.4.0/include/opencv2/opencv.hpp:48:10: fatal error: opencv2/opencv_modules.hpp: No such file or directory
48 | #include "opencv2/opencv_modules.hpp"
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [src/subdir.mk:20: src/displayIMage.o] Error 1
"make all" terminated with exit code 2. Build might be incomplete.
I followed everything according to this tutorial. I tried running pkg-config --cflags opencv to find the right paths but that gave me this error -
Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found
What am I doing wrong?
I'm trying to get a simple 'Hello World' program to build on Windows 10, preferably using CMake and clang. I can successfully compile, link and run the same project if I use the g++ compiler from MinGW, but have problems when I try using clang++.
I have CMake, MinGW and LLVM already installed and accessible in my path:
clang++
clang++: error: no input files
cmake --version
cmake version 3.16.0-rc1
I have set up environment variables for CMake to use clang:
echo %CC%
C:\Program Files\LLVM\bin\clang.exe
echo %CXX%
C:\Program Files\LLVM\bin\clang++.exe
Now when I run cmake with my simple "Hello World" C++ project, cmake complains about not being able to use clang:
cmake -G "MinGW Makefiles" ..
-- The CXX compiler identification is Clang 9.0.0 with GNU-like command-line
-- Check for working CXX compiler: C:/Program Files/LLVM/bin/clang++.exe
-- Check for working CXX compiler: C:/Program Files/LLVM/bin/clang++.exe -- broken
CMake Error at C:/Program Files/CMake/share/cmake-3.16/Modules/CMakeTestCXXCompiler.cmake:53 (message):
The C++ compiler
"C:/Program Files/LLVM/bin/clang++.exe"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: C:/Users/pball/git/bchest/build/CMakeFiles/CMakeTmp
Run Build Command(s):C:/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/mingw32-make.exe cmTC_838da/fast && C:/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/mingw32-make.exe -f CMakeFiles\cmTC_838da.dir\build.make CMakeFiles/cmTC_838da.dir/build
mingw32-make.exe[1]: Entering directory 'C:/Users/pball/git/bchest/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_838da.dir/testCXXCompiler.cxx.obj
C:\PROGRA~1\LLVM\bin\CLANG_~1.EXE -g -Xclang -gcodeview -O0 -D_DEBUG -D_DLL -D_MT -Xclang --dependent-lib=msvcrtd -o CMakeFiles\cmTC_838da.dir\testCXXCompiler.cxx.obj -c C:\Users\pball\git\bchest\build\CMakeFiles\CMakeTmp\testCXXCompiler.cxx
Linking CXX executable cmTC_838da.exe
"C:\Program Files\CMake\bin\cmake.exe" -E cmake_link_script CMakeFiles\cmTC_838da.dir\link.txt --verbose=1
C:\PROGRA~1\LLVM\bin\CLANG_~1.EXE -fuse-ld=lld-link -nostartfiles -nostdlib -g -Xclang -gcodeview -O0 -D_DEBUG -D_DLL -D_MT -Xclang --dependent-lib=msvcrtd #CMakeFiles\cmTC_838da.dir\objects1.rsp -o cmTC_838da.exe -Xlinker /implib:cmTC_838da.lib -Xlinker /pdb:C:\Users\pball\git\bchest\build\CMakeFiles\CMakeTmp\cmTC_838da.pdb -Xlinker /version:0.0 #CMakeFiles\cmTC_838da.dir\linklibs.rsp
lld-link: error: could not open 'kernel32.lib': no such file or directory
lld-link: error: could not open 'user32.lib': no such file or directory
lld-link: error: could not open 'gdi32.lib': no such file or directory
lld-link: error: could not open 'winspool.lib': no such file or directory
lld-link: error: could not open 'shell32.lib': no such file or directory
lld-link: error: could not open 'ole32.lib': no such file or directory
lld-link: error: could not open 'oleaut32.lib': no such file or directory
lld-link: error: could not open 'uuid.lib': no such file or directory
lld-link: error: could not open 'comdlg32.lib': no such file or directory
lld-link: error: could not open 'advapi32.lib': no such file or directory
lld-link: error: could not open 'oldnames.lib': no such file or directory
lld-link: error: could not open 'msvcrtd.lib': no such file or directory
CLANG_~1: error: linker command failed with exit code 1 (use -v to see invocation)
mingw32-make.exe[1]: *** [CMakeFiles\cmTC_838da.dir\build.make:88: cmTC_838da.exe] Error 1
mingw32-make.exe[1]: Leaving directory 'C:/Users/pball/git/bchest/build/CMakeFiles/CMakeTmp'
mingw32-make.exe: *** [Makefile:120: cmTC_838da/fast] Error 2
This is a freshly installed Windows 10 PC. It has no Visual Studio nor any Microsoft development tool installed on it. If possible I would prefer not having to install the Visual Studio for example to get the msvcrtd.lib. I am using VS Code at the moment, but this should be independent of the IDE being used.
My question is, what exactly do I have to install apart from LLVM, CMake and MinGW to make my first simple C++ project to build?
You are missing the libraries in the linker flag. These libraries may be found in the following location:
C:\Program Files (x86)\Windows Kits\10\Lib\10.0.17134.0\um\x86
The exact path on your system may vary depending on the OS version etc., but you get the idea i believe. After finding the location you can add the path to the compiler flag in the CMakeLists.txt file e.g.,
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Xlinker /libpath:path_to_library")
See related answers:
https://software.intel.com/en-us/forums/intel-fortran-compiler/topic/784047
https://stackoverflow.com/a/48576249/811335
How /libpath flag is used:
https://learn.microsoft.com/en-us/cpp/build/reference/libpath-additional-libpath?view=vs-2019
To force Clang to use its own libraries instead of MSVC's, add "-target x86_64-w64-mingw32" to CMAKE_C(XX)_FLAGS.
Beware: you have to do this before CMake identifies the compiler, e.g. either before the first C or C++ project definition in CMake (e.g. before the project() call):
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -target x86_64-w64-mingw32")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -target x86_64-w64-mingw32")
project(MyProject ...)
Alternatively, you can pass it with "-D" to CMake on the command line.
Tested with clang 10.0
If I remember correctly, Clang attempts to use MSVC's standard library on Windows by default, since Clang's own standard library doesn't work on Windows yet.
If you don't have MSVC installed, this causes problems.
The easiest solution is to install MSYS2 and use MSYS2's patched Clang, which uses GCC's libraries by default. As a nice bonus, MSYS2 also comes with an up-to-date GCC version.
Alternatively, you can use -target flag to tell Clang to use GCC's libraries. If I remember correctly, this is done by adding -target x86_64-w64-mingw32 to both compiler and linker flags.
(If it doesn't work, try -target x86_64-w64-windows-gnu, I can't remember which one it is. Replace x86_64 with i686 if you're using a 32-bit compiler.)
Your Clang compiler is probably built to target the MSVC ABI. If I try your scenario, this is my error message:
-- The CXX compiler identification is Clang 9.0.0
CMake Error at C:/Program Files/CMake/share/cmake-3.13/Modules/CMakeDetermineCompilerId.cmake:802 (message): The Clang compiler tool
"C:/Program Files/LLVM/bin/clang++"
targets the MSVC ABI but has a GNU-like command-line interface. This is not supported. Use 'clang-cl' instead, e.g. by setting 'CXX=clang-cl' in the environment. Furthermore, use the MSVC command-line environment.
This was with CMake 3.13 and LLVM 9.0, and trying to use -G "MinGW Makefiles". It works using this:
SET CXX="C:/Program Files/LLVM/bin/clang-cl.exe"
cmake -G "NMake Makefiles" ..
You probably don't need to install Visual Studio, but if you want to use nmake and the MSVC libraries, you definitely need the Windows 10 SDK which is a big download, and it will be installed as well if you decide to install Visual Studio.
On the other hand, The problem seems to be related to the CMake 3.16 version. The above unsucessful tests were made with cmake 3.13, but after that I've upgraded to CMake 3.15.5 and it works perfectly. Here are the exact versions:
> cmake -version
cmake version 3.15.5
> clang++ --version
clang version 9.0.0 (tags/RELEASE_900/final)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin
My build.cmd script:
SET CXX="C:/Program Files/LLVM/bin/clang++.exe"
cmake -G "MinGW Makefiles" ..
So the problem may be with your CMake version, or the MinGW libraries, as your error message is suggesting.
I have encountered a problem after setting the path of boost libraries in Eclipse. I get an error like:
No such file or directory
compilation terminated.
Here is my log:
15:32:06 **** Rebuild of configuration Debug for project Demo ****
Info: Internal Builder is used for build
g++ "-IC:\\boost\\boost_1_66_0" "-includeC:\\boost_1_66_0" -O0 -g3 -Wall -c -fmessage-length=0 -o "src\\Demo.o" "..\\src\\Demo.cpp"
cc1plus: fatal error: C:\boost_1_66_0: No such file or directory
compilation terminated.
15:32:06 Build Finished. 0 errors, 0 warnings. (took 147ms)
Looks like your paths aren’t aligned for the -l flag and the -include flag. It should be “-includeC:\boost\boost_1_66_0”, or the correct path to the boost root directory.
See this boost doc for more info.
I am trying to build the project ROOT. There is a command to build using cmake ../root. Whenever, I try to run this command it gives me this error:
Harshits-Air:root harshitprasad$ cmake ../root
-- Found a Mac OS X System 10.13
-- Found a 64bit system
-- Found LLVM compiler collection
-- ROOT Platform: macosx
-- ROOT Architecture: macosx64
-- Build Type: RelWithDebInfo
-- Compiler Flags: -Wc++11-narrowing -Wsign-compare -Wsometimes-uninitialized -Wconditional-uninitialized -Wheader-guard -Warray-bounds -Wcomment -Wtautological-compare -Wstrncat-size -Wloop-analysis -Wbool-conversion -m64 -pipe -W -Wshadow -Wall -Woverloaded-virtual -fsigned-char -fno-common -Qunused-arguments -pthread -std=c++11 -stdlib=libc++ -O2 -g -DNDEBUG
CMake Error at cmake/modules/RootNewMacros.cmake:1041 (message):
ROOT should be built as an out of source build, to keep the source
directory clean. Please create a extra build directory and run the command
'cmake <path_to_source_dir>' in this newly created directory. You have
also to delete the directory CMakeFiles and the file CMakeCache.txt in the
source directory. Otherwise cmake will complain even if you run it from an
out-of-source directory.
Call Stack (most recent call first):
CMakeLists.txt:107 (ROOT_CHECK_OUT_OF_SOURCE_BUILD)
I'm not able to understand what this error means? It would be great if anyone can help me out with this issue. Thanks!
The error message simply tells you to create an additional build folder e.g. build next to the ROOT project folder root, change to this directory and call cmake ../root from there.
TLDR; To simply call the following sequence starting from the root folder:
cd ..
mkdir build
cd build
cmake ../root
ok so i installed CDT for C++ development on my machine. I tried to make it work and followed these instructions to set everything up. By mistake i have gone into the Project>Properties>C++ Build>Enviorement and hit restore defaults by mistake. I dont know if that changed anything but i get the following error when i run my class.
I tried to switch the slashes in the given path "C:\Users\Nathan\workspace\Project\Debug" to forward slashes but that did nothing. I still get the same error. Any hints on what im doing wrong?
19:12:58 **** Incremental Build of configuration Debug for project Project ****
make all
Building file: ../src/Project.cpp
Invoking: Cross G++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/Project.d" -MT"src/Project.d" -o "src/Project.o" "../src/Project.cpp"
cygwin warning:
MS-DOS style path detected: C:\Users\Nathan\workspace\Project\Debug
Preferred POSIX equivalent is: /cygdrive/c/Users/Nathan/workspace/Project/Debug
CYGWIN environment variable option "nodosfilewarning" turns off this warning.
Consult the user's guide for more details about POSIX paths:
http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
In file included from /usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/cwchar:44:0,
from /usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/bits/postypes.h:42,
from /usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/iosfwd:42,
from /usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/ios:39,
from /usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/ostream:40,
from /usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/iostream:40,
from ../src/Project.cpp:9:
/usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/cstddef:44:20: fatal error: stddef.h: No such file or directory
src/subdir.mk:18: recipe for target `src/Project.o' failed
compilation terminated.
make: *** [src/Project.o] Error 1
19:12:59 Build Finished (took 535ms)