I'm trying to build libwebsockets library using minGW by following the steps available at https://github.com/warmcat/libwebsockets/blob/master/READMEs/README.build.md
under the section
#section cmwmgw Building on Windows (MinGW)
I'm doing
cmake -G "MSYS Makefiles" -DCMAKE_INSTALL_PREFIX=C:\Users\pro12\Desktop\lib\libwebsockets
the directory "C:\Users\pro12\Desktop\lib\libwebsockets" contains the source files for the libwebsockets library and I'm runnning this command from
C:\Users\pro12\Desktop\libwebsockets\build
but it giving me error
CMake Error: The source directory "C:/Users/pro12/Desktop/libwebsockets/build" does not appear to contain CMakeLists.txt.
Can anyone tell what i'm doing wrong here? Thanks
Since you are building it in C:\Users\pro12\Desktop\libwebsockets\build, but your source code is in C:\Users\pro12\Desktop\libwebsockets, obviously cmake could not find the CMakeLists.txt, try
cmake -G "MSYS Makefiles"
-DCMAKE_INSTALL_PREFIX=C:\Users\pro12\Desktop\lib\libwebsockets ..
Do not omit the .. two tailing dots: these indicate the parent directory!
Your libwebsockets "CMakeLists.txt" file is exist in
"C:/Users/pro12/Desktop/libwebsockets"
but your "cmake" CMD is running in
"C:/Users/pro12/Desktop/libwebsockets/build"
so , you should:
cmake .. -G "MSYS Makefiles"
-DCMAKE_INSTALL_PREFIX=C:\Users\pro12\Desktop\lib\libwebsockets
it can specify "CMakeList.txt" file's directory
Related
I know there is binary released for Windows, I just want to try to compile it myself.
I got CMake, mingw32-make, gcc, gfortran and so on properly installed. (Using MinGW)
I tried
cd lapack
mkdir build
cd build
cmake -G "MinGW Makefiles" ..
mingw32-make
Then I got the static library liblapack.a and libblas.a for Fortran, but no liblapacke.a (the C interface of lapack).
Is there a easy solution?
LAPACKE is a collection of headers, there is nothing to be build. Link your program with the libraries you got (liblapack and libblas).
I have a C application using CMake to generate Makefiles on Linux. The application contains .c as well as .proto files. Now I need to genearte .pb-c.c and .pb-c.h using protoc command in the CMakeLists.txt so that when I do cmake . the cmake generates the corresponding .pb-c and .pb-h. The protoc is used as:
execute_process(COMMAND bash -c "${PROTOC_PATH} --c_out=${CMAKE_CURRENT_SOURCE_DIR}/ --proto_path=${PROTO_DIR}/ ${PROTO_DIR}/*.proto")
The problem is that my protoc binary and related .so file is not in /usr/bin and /usr/lib or /usr/local/bin and /usr/local/lib. They are in a directory inside the project - $HOME/project-name/dependencies/bin/protoc and $HOME/project-name/dependencies/lib/libprotobuf.so.12
Due to this I am getting error - error while loading shared libraries: libprotobuf.so.12: cannot open shared object file: No such file or directory
But if I give the command as
execute_process(COMMAND bash -c "protoc--c_out=${CMAKE_CURRENT_SOURCE_DIR}/ --proto_path=${PROTO_DIR}/ ${PROTO_DIR}/*.proto") and run cmake . then it works fine as linker is able to get the .so file from /usr/lib
Mentioned below is a part of my CMakeLists.txt file
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-rpath=${PROTOC_LIB_PATH} -L${PROTOC_LIB_PATH} -lprotobuf")
set(CMAKE_SHARED_LINKER_FLAGS "-Wl,-rpath=${PROTOC_LIB_PATH} -L${PROTOC_LIB_PATH} -lprotobuf")
execute_process(COMMAND bash -c "${PROTOC_PATH} --c_out=${CMAKE_CURRENT_SOURCE_DIR}/ --proto_path=${PROTO_DIR}/ ${PROTO_DIR}/*.proto")
But it's not working due to aforementioned error.
Also for those who might say it's a duplicate I have looked into and tried the following SO questions:
Turning on linker flags with CMake
I don't understand -Wl,-rpath -Wl,
CMake link to external library
Does cmake have something like target_link_options?
CMAKE RPATH not working - could not find shared object file
https://serverfault.com/q/279068/435497
How to add linker flag for libraries with CMake?
https://serverfault.com/a/926072/435497
If you do not have a special use case, you do not need to call protoc yourself. Let CMake do this for you.
Have a look at: https://cmake.org/cmake/help/v3.16/module/FindProtobuf.html
and Cmake : find protobuf package in custom directory
I found this link which has a script showing how to create a PROTOBUF_GENERATE_C function which can then be used to generate the .pb-c abd .pb-h files.
From the above script I got the idea to make use of find_program which is similar to find_library in a way that it lets you pass the PATHS/PATH option so that CMake looks for the required program in the mentioned path.
I'm trying to set up CMake for a project I'm working on, and I'm first trying to compile a simple Hello World program in C. I'm using Windows 10 with MSYS2. If I invoke the compiler (GCC) directly in Bash, it compiles fine without warnings or errors and gives an executable as output which prints "Hello, world!" exactly as expected. My problem comes in when I try to use CMake to compile my project. When I run cmake -G Ninja .. to compile my project, it throws this error:
CMake Error at C:/msys64/mingw64/share/cmake-3.15/Modules/CMakeTestCCompiler.cmake:60 (message):
The C compiler
"C:/msys64/mingw64/bin/cc.exe"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: C:/Users/dylanweber/Documents/C-Projects/webapp/build/CMakeFiles/CMakeTmp
Run Build Command(s):C:/msys64/usr/bin/ninja.exe cmTC_45340 && [1/2] Building C object CMakeFiles/cmTC_45340.dir/testCCompiler.c.obj
FAILED: CMakeFiles/cmTC_45340.dir/testCCompiler.c.obj
C:\msys64\mingw64\bin\cc.exe -o CMakeFiles/cmTC_45340.dir/testCCompiler.c.obj -c testCCompiler.c
/bin/sh: C:msys64mingw64bincc.exe: command not found
ninja: build stopped: subcommand failed.
Notice how it mentions C:msys64mingw64bingcc.exe... there must be some kind of path delineation problem but I've tried setting the CC environmental variable to C:\\msys64\\mingw64\\bin\\gcc.exe and C:/msys64/mingw64/bin/gcc.exe. I have been clearing the CMake caches between runs.
Here is my CMakeLists.txt file:
cmake_minimum_required(VERSION 3.15)
project(webapp)
set(CMAKE_BINARY_DIR ${CMAKE_SOURCE_DIR}/build)
set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR})
set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR})
file(GLOB SOURCES "main/*.c")
add_executable(webapp ${SOURCES})
My code is in a "main" folder which is currently just one "main.c" file, in addition to a build directory used to keep all the temporary files in. The most frustrating part is that CMake was just working an hour ago, and I didn't change anything. What can I do to fix this problem?
The solution was not only installing the MinGW64 version of CMake, but also the MinGW64 version of Ninja as well. Since they have different pathing schemes compared to MSYS, they didn't play well together until they were both on the same POSIX-like platform.
I try to install eigen3.3.7 with cmake on ubuntu 16 but cmake fails.
I follow the INSTALL file hints :
1) I extract the tar archive
2) Make a "build" dir named buildDir
3) Go to build dir : cd buildDir
4) Start cmake : cmake ../Eigen
Then the cmake process ends up with the error :
CMake Error at CMakeLists.txt:1 (include):
include could not find load file:
RegexUtils
CMake Error at CMakeLists.txt:2 (test_escape_string_as_regex):
Unknown CMake command "test_escape_string_as_regex".
May I ask you some hints please ?
Regards
Sylvain
I followed the advices of chtz, but it still fails, see below the console output :
syl#spica:~/tmp/eigen/eigen-eigen-323c052e1731$ cat INSTALL
Installation instructions for Eigen
***********************************
Method 2. Installing using CMake
********************************
Let's call this directory 'source_dir' (where this INSTALL file is).
Before starting, create another directory which we will call 'build_dir'.
Do:
cd build_dir
cmake source_dir
make install
syl#spica:~/tmp/eigen/eigen-eigen-323c052e1731$ mkdir build && cd build
syl#spica:~/tmp/eigen/eigen-eigen-323c052e1731/build$ cmake ../
CMake Error at CMakeLists.txt:1 (include):
include could not find load file:
RegexUtils
CMake Error at CMakeLists.txt:2 (test_escape_string_as_regex):
Unknown CMake command "test_escape_string_as_regex".
CMake Warning (dev) in CMakeLists.txt:
No cmake_minimum_required command is present. A line of code such as
cmake_minimum_required(VERSION 3.5)
should be added at the top of the file. The version specified may be lower
if you wish to support older CMake versions for this project. For more
information run "cmake --help-policy CMP0000".
This warning is for project developers. Use -Wno-dev to suppress it.
-- Configuring incomplete, errors occurred!
See also "/home/syl/tmp/eigen/eigen-eigen-323c052e1731/CMakeFiles/CMakeOutput.log".
syl#spica:~/tmp/eigen/eigen-eigen-323c052e1731/build$ vim ../CMakeFiles/CMakeOutput.log
Thanks for helping.
This sequence of commands seems to work properly after downloading (in my case the currently latest version eigen-3.3.7):
bunzip2 eigen-3.3.7.tar.bz2
tar -xvf eigen-3.3.7.tar
cd eigen-3.3.7/
mkdir build
cd build
cmake ../.
sudo make install
I am building the C Project using CMAKE. My build is working fine, but the problem is if any errors and warnings are there in the source code it's displaying on the command prompt. How can I redirect warnings and compilation errors to a file, So it's easy for me to resolve one by one? I am running my CMake using the following commands in the batch file.
cmake -G "MinGW Makefiles" ..
make
pause