I learn embedded programming with STM32F401RE in IAR Workbench.
I am confused about header file creation after build. Here below my question:
In the below file structure of IAR Workbench before build only a c file and there is no header file in the user folder
However after build process there are many header file in the user folder file.
My question is what is the purpose of the header file in it.
In addition to that question all headers files must be involved before build process?
Thanks.
Those are all header files that you have included in your main.c file, either directly or indirectly. Most at least are IAR library headers that come with the compiler. They are not created, but instead detected to be in use when you build your project.
For example, if you #include <stdio.h> in your source file, then stdio.h will be on that list. And all files that stdio.h includes will also be on that list. And then all includes from those included files are also on that list.
IAR library header files have typically have a lot of nested includes in them. Most likely you have at least one IAR library #include in your main.c file, or you have preincluded in a library header with your compiler command.
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I've been given these source files and headers. In the README.md the authors explain how to launch the test executables without the need of a proper installation. It is just a make command to run. They explain how to generate the .so files. I think these latter are meant to be used if I wanted to install the APIs at a system level (the definitions should be in api.h). My question is: where should I copy the shared objects generated by the Makefile and the api.h header? I aim to write a source file from scratch where I use those APIs (e.g. crypto_sign()) just including the headers, if it is possible. Thanks
where should I copy the shared objects generated by the Makefile and the api.h header? I aim to write a source file from scratch where I use those APIs (e.g. crypto_sign()) just including the headers, if it is possible
Nowhere.
The project comes with CMake support. Use CMake in your project and just add_subdirectory the repository directory.
Anyway, if you really wish to install the library system-wide, then FHS specifies directory structure on linux. For local system administration use /usr/local/lib for local libraries .so files and /usr/local/include for local C header files.
I am trying to import a static library based on Hierarchical Matrices (H2Lib). The folder contains a make file which compiles the library files, examples and tests into a single .a file. I have referred to tutorials on creating and using static libraries in C using archiver command line in Linux but this does not create a header file, which I had to create manually while working out the tutorial. The H2Lib has multiple files and it would be difficult and time consuming to create a header file manually for this. I am not sure if I am missing something here or doing something wrong; I am new to the concept of libraries in C. Can some one please help me on how to use this library in C?
P.S: git repository link for H2Lib: https://github.com/H2Lib/H2Lib/tree/master
You are not supposed to write the header files yourself. Somewhere on the folder where the library is defined there should be a directory with multiple .h files (the headers) (it's usually named include).
What you need to do is include them into your project. You do this by appending -I to the path of each folder containing the headers and then writing #include "headername.h" in your source code.
So if the headers are in dir/include, you'd do:
gcc yourfiles.c <flags> output.o -I dir/include
I'm trying to Include some Libraries, like metis in the custom code library section in Simulink. Do you know what type of libraries Simulink excepts? Must they have the ending .a, .o, .dll or lib?
And can I include them into my custom c code with #include <metis.h>?
The library format should match the architecture on which you are going to compile the generated code. So .a or .so for GNU/Linux, .lib for Windows (you usually link against the .lib file not the .dll), and usually .dylib on Mac. You can also link in object files, (i.e. .o, .obj) but typically a software package will build some type of library for you to use.
If you are using any of the functions, types, etc. defined in any of the metis headers, then those headers need to be included in the generated code.
You can add #include "header_name.h" to the settings:
"Configuration Parameters->Simulation Target->Custom Code->Header File"
and:
"Configuration Parameters->Code Generation->Custom Code->Header File"
where header_name.h is replaced with the needed header file's name.
Since this question is tagged MATLAB Coder you can also use coder.cinclude('header_name.h'); in your MATLAB code to generate a #include "header_name.h" in the C code.
You may also need to augment the Include directories settings on the aforementioned Custom Code panes to allow the compiler to locate the headers.
I have a large C project, with multiple directories and subdirectories, that I'm trying to document with Doxygen version 1.7.6.1-2ubuntu1.
My problem is that the project has a file (string.h) which Doxygen is confusing with the system library include file of the same name. In the project code, the project file is included with #include "lib/string.h" and the system file is included with #include <string.h>.
However Doxygen always references the project include file, regardless of which of the two #include forms is used. (And since the project string.h happens to include the system string.h, Doxygen actually shows a self-referential dependency in the dependency graph!)
How can I configure Doxygen to take notice of whether #include "..." or #include <...> has been used, and not match the project file in the latter case? It's not a practical proposition to rename the project file and change all of the other files that use it.
I downloaded the libftp source from here, and compiled it using make. Now I just have a binary called "ftp" in the same directory. Do I need to move it to one of the root directories, like /usr/bin? Do I still need the source files so that I can #include the library?
To use a library in your own code, first you need that library - generally named lib{name}.a or lib{name}.so. The library will be required during linking. So when you make, make sure it creates the library and not just the ftp binary.
Secondly, at compile time you will need the header files so that the #include's don't throw errors. So as far as source goes, you will at least need the header files.