I'm working with CMake and want to ask if there is any command, that gives you the unknown path of a Config.cmake File. I need it, because the CMakeLists File should be designed for computers, where I don't know the structure of the folders (e.g. E:/exampleFolder/LibConfig.cmake). I have a library on the same partition like the CMakeLists File and want to know where exactly the LibaryConfig.cmake File is. Maybe the command findpackage(Libexample) could be expanded? I tried it with find_path() but how do I save or show the path?
Thank you for your help.
Related
I'm building a project using CMake in multiple subdirectories. There is a parent directory containing a parent CMakeLists file, and each subdirectory contains its own CMakeLists file. As such, I'm using the add_subdirectory command to run the subdirectories.
My issue is that one of the subdirectories generates code that another subdirectory needs in order to build. Specifically, it's Google Protocol Buffers. The CMakeLists file in that subdirectory will generate the pb.cc and pb.h files if run independently, but until I do so, I cannot generate the cache of the parent CMake file as it complains it's missing those source files.
Directory structure is as follows:
/
--CMakeLists.txt
--protobuf/
----CMakeLists.txt
----src/
--main/
----CMakeLists.txt
----src/
Where the main subdirectory requires files generated by the protobuf subdirectory.
Is there a way I can have the parent CMakeLists file build the subdirectory as part of its generation step? Or somehow mark the protobuf files as required, but missing, so the generation does not fail?
You can try running this particular cmake file as execute_process before including the main file. But this goes against the designed cmake usage.
The correct answer would be to make your generation step a part of build process. If you can post a minimal, reproducible example of your problem I could give you concrete ways to solve your problem directly instead of making your workaround work.
Sorry for asking a noob question.
So I am using SpaceVim to write Arduino code. The source code is in Project/src, and the libraries are in Project/lib. I had an include in my main file that includes a library in the lib folder, but SpaceVim does not seem to be able to find it.
I think there might be some setting that I am not aware of that I could setup in init.toml.
I have looked around on the SpaceVim Documentation and done some Googling, with no results.
In the repository root directory create a .clang file containing the gcc flags
for using your include directories. More specifically, the .clang file should contain the following:
-I/path/to/your/include/directory
Or, in the case of multiple include directories:
-I/path/to/include/dir_1 -I/path/to/include/dir_2 ... -I/path/to/include/dir_n
where 'n' is the number of include directories.
For your case, the file should contain:
-I./lib (assuming that you compile from inside the Project directory)
In case you are not sure about the include flags while building against one or multiple libraries, you can use the command to generate the flags for you:
pkg-config --cflags-only-I <yourlib>
or for multiple libraries
pkg-config --cflags-only-I <lib1> <lib2> <lib3> ...
After that, you can simply paste the output to the .clang file.
SpaceVim author here, you can create a . clang file to make the lint find the right path of your project.
In the main folder of my project, I have a CMakeLists.txt file. Inside this file, I include (using add_subdirectory) another CMakeLists.txt file located in my header file directory. The responsibility of this second file is to add all of my header files to the project:
file(GLOB gl_nbody_HEADERS "*.h")
add_executable(gl_nbody ${gl_nbody_HEADERS})
However, this files causes an error:
CMake Error: CMake can not determine linker language for target:gl_nbody
CMake Error: Cannot determine link language for target "gl_nbody".
What is strange is that when I include the two lines causing this error in my main CMakeLists.txt file (modified to work correctly for the change in directory), it works fine.
What is going wrong here?
add_executable causes the creation of an executable target, meaning the compilation of a list of source code files into an executable binary.
In order for this to work, and have CMake select a suitable compiler, the list of source files must contain at least one file with a "compilable" extension, ie. .c, or .cpp, or .cxx....
I don't see why you are trying to compile an executable here, since you only seem to try to list header files for inclusion into a project (which only makes sense for IDE-based generators, such as Visual Studio).
Also, it is not recommended to use globbing of files in CMake, because if you add more files to your project, CMake cannot detect them automatically, and will not regenerate build files. Please list all files explicitely.
The proper solution here is to list the header files in the proper add_executable command call where you list the actual source files that you want to compile.
You might also want to use the source_group() command, that allows you to group files into folders in the generated Visual Studio solution, for example:
source_group(header_files ${gl_nbody_HEADERS})
I have a CMakeLists.txt file for a library. It's pretty basic:
set(LIB_FILES source/first.cpp)
add_library(first ${LIB_FILES})
I put the files in a list because I will eventually be adding more source files to the library. The problem is that all of the files will be in the source directory. And I don't want to constantly have to repeat that.
I also don't want to use the GLOB pattern matching solution, because I want to have to edit the CMakeLists.txt file when I add a new file. That way, my build will re-build the build solution, and new files will correctly appear (as I understand it. I'm still new with CMake).
I tried adding a CMakeLists.txt file into the source directory itself, just to build the LIB_FILES list. That didn't work out very well. Variables in CMake are file scoped. And even when I broke scoping (with PARENT_SCOPE), I still had to prefix each file with the directory. So that gained nothing.
I don't want to put the actual library definition in the source directory, as that will generate all the build files in the source directory. And I don't want that. Also, I will need to include headers that aren't in or under the source directory.
My directory structure looks like this:
libroot (where the project build files should go)
\-source (where the source code is)
\-include (where the headers that the user of the library includes go)
So how do I tell CMake that all of the source files come from the source directory, so that I don't have to constantly spell it out?
You could move the add_library call to your source/CMakeLists.txt also:
set(LIB_FILES first.cpp)
add_library(first ${LIB_FILES})
Then just use add_subdirectory in your top-level CMakeLists.txt:
add_subdirectory(source)
you could use a simple macro for that
macro(AddSrc dst_var basepath_var)
foreach(file ${ARGN})
list(APPEND ${dst_var} ${basepath_var}/${file})
endforeach()
endmacro()
set(MY_SRCFILES "")
AddSrc(MY_SRCFILES path/to/source
foo.cpp
bar.cpp
whatever.cpp
)
Compiler: Mingw GCC compiler
In make file I specified src directory location like below..
dirsrc = ./src
So here I mentioned current directory. The problem is the generated DLL having the Absolute path to the source directory. Is there any way to notify the compiler which should be relative.?
Because I am generating this DLL with Codecoverage information. If I moved my full project structure to somewhere means while simulating the DLL to target, at that time the DLL refers to the absolute path of the source directory.
I need the DLL with relative path to the source directory.? How do I write the make file with relative path to the source directory?
The real problem is,
I am doing code coverage analysis using gcov.
I followed following steps:
1.) I compiled my program with GNU CC options: `-fprofile-arcs -ftest-coverage'.
2.) I got 2 additional file with suffix *.bb and *.bbg in same directory
3.) Running the program will cause profile output to be generated.
For each source file compiled with -fprofile-arcs', an accompanying .da' file will be placed in the source directory. The name of the .da' file is stored as an *_absolute pathname_* in the resulting object file. This path name is derived from the source file name by substituting a .da' suffix.
The problem here is that I am compiling on one machine and running on a seperate machine. Each '.da' file has absoulte pathname in the resulting object file. So it does not find same path on another machine.
Is it possible to have fprofile-arcs and any other profiling-related options in GCC to have file names relative rather than absolute.
please let me asap.! thanks in advance.