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Building and using the Library {#build_lib}
==============================
@brief How to build the library and test programs and include the library in an application
Platform Support
----------------
The current makefiles and build projects support building the library on:
- Linux and Windows, x86 or x64 hosts.
- ARM linux - AArch32 and AArch64
- ARM aarch32 and aarch64 libs, x-compiled on x86/64 hosts.
In addition to building the library from the project, the library may be installed into the standard
`/usr/lib/` area in Linux, and will soon be available as a package from Linux Distros.
Building the Library
--------------------
The library and test programs are built from the library `./build/<platform>` directory, where
<platform> is either 'linux' or 'win-vs2015' / 'win-vs2022'
See [`./docs/test_progs.md`](@ref test_progs) for further information on use of the test
programs.
### Linux x86/x64/ARM ###
Libraries are built into a <tgt_dir>. This is used as the final output directory for the
libraries in `decoder/lib/<tgt_dir>`, and also as a sub-directory of the build process for
intermediate files - `decoder/build/linux/ref_trace_decode_lib/<tgt_dir>`.
For a standard build, go to the `./build/linux/` and run `make` in that directory.
This will set <tgt_dir> to `builddir` for all build variants of the library. Using this only one variant of the library can be built at any one time.
For development, alternatively use `make -f makefile.dev`
This will set <tgt_dir> to `linux<bit-variant>/<dbg|rel>` and therefore build libraries into the
`decoder/lib/linux<bit-variant>/<dbg|rel>` directories, allowing multiple variants of the library
to be present during development.
e.g.
`./lib/linux64/rel` will contain the linux 64 bit release libraries.
`./lib/linux-arm64/dbg` will contain the linux aarch 64 debug libraries for ARM.
Options to pass to both makefiles are:-
- `DEBUG=1` : build the debug version of the library.
Options to pass to makefile.dev are:-
- ARCH=<arch> : sets the bit variant in the delivery directories. Set if cross compilation for ARCH
other than host. Otherwise ARCH is auto-detected.
<arch> can be x86, x86_64, arm, arm64, aarch64, aarch32
For cross compilation, set the environment variable `CROSS_COMPILE` to the name path/prefix for the
compiler to use. The following would set the environment to cross-compile for ARM
export PATH=$PATH:~/work/gcc-x-aarch64-6.2/bin
export ARCH=arm64
export CROSS_COMPILE=aarch64-linux-gnu-
The makefile will scan the `ocsd_if_version.h` to get the library version numbers and use these
in the form Major.minor.patch when naming the output .so files.
Main C++ library names:
- `libcstraced.so.M.m.p` : shared library containing the main C++ based decoder library
- `libcstrace.so.M` : symbolic link name to library - major version only.
- `libcstrace.so` : symbolic link name to library - no version.
C API wrapper library names:
- `libcstraced_c_api.so.M.m.p` : shared library containing the C-API wrapper library. Dependent on `libcstraced.so.M`
- `libcstraced_c_api.so.M` : symbolic link name to library - major version only.
- `libcstraced_c_api.so` : symbolic link name to library - no version.
Static versions of the libraries:
- `libcstraced.a` : static library containing the main C++ based decoder library.
- `libcstraced_c_api.a` : static library containing the C-API wrapper library.
Test programs are delivered to the `./tests/bin/<tgt_dir>` directories.
The test programs are built to used the .so versions of the libraries.
- `trc_pkt_lister` - dependent on `libcstraced.so`.
- `simple_pkt_print_c_api` - dependent on `libcstraced_c_api.so` & hence `libcstraced.so`.
The test program build for `trc_pkt_lister` also builds an auxiliary library used by this program for test purposes only.
This is the `libsnapshot_parser.a` library, delivered to the `./tests/lib/<tgt_dir>` directories.
**Note on Linux Build Directory Names**
Due to tool limitations, the makefiles will not operate correctly if the path to the opencsd directories contains spaces.
e.g. checking out the project into a directory such as ` /home/name/my opencsd/` will result in build failures.
__Installing on Linux__
The libraries can be installed on linux using the `make install` command. This will usually require root privileges. Installation will be the version in the `./lib/<tgt_dir>` directory, according to options chosen.
e.g. ` make -f makefile.dev DEBUG=1 install`
will install from `./lib/linux64/dbg`
The libraries `libopencsd` and `libopencsd_c_api` are installed to `/usr/lib`.
Sufficient header files to build using the C-API library will be installed to `/usr/include/opencsd`.
The installation can be removed using `make clean_install`. No additional options are necessary.
### Windows (x86/x64) ###
Use the `.\build\win\ref_trace_decode_lib\ref_trace_decode_lib.sln` file to load a solution
which contains all library and test build projects.
Libraries are delivered to the `./lib/win<bitsize>/<dbg\rel>` directories.
e.g. `./lib/win64/rel` will contain the windows 64 bit release libraries.
The solution contains four configurations:-
- *Debug* : builds debug versions of static C++ main library and C-API libraries, test programs linked to the static library.
- *Debug-dll* : builds debug versions of static main library and C-API DLL. C-API statically linked to the main library.
C-API test built as `simple_pkt_print_c_api-dl.exe` and linked against the DLL version of the C-API library.
- *Release* : builds release static library versions, test programs linked to static libraries.
- *Release-dll* : builds release C-API DLL, static main library.
_Note_: Currently there is no Windows DLL version of the main C++ library. This may follow once
the project is nearer completion with further decode protocols, and the classes requiring export are established..
Libraries built are:-
- `libcstraced.lib` : static main C++ decoder library.
- `cstraced_c_api.dll` : C-API DLL library. Statically linked against `libcstraced.lib` at .DLL build time.
- `libcstraced_c_api.lib` : C-API static library.
There is also a project file to build an auxiliary library used `trc_pkt_lister` for test purposes only.
This is the `snapshot_parser_lib.lib` library, delivered to the `./tests/lib/win<bitsize>/<dgb\rel>` directories.
### Additional Build Options ###
__Library Virtual Address Size__
The ocsd_if_types.h file includes a #define that controls the size of the virtual addresses
used within the library. By default this is a 64 bit `uint64_t` value.
When building for ARM architectures that have only a 32 bit Virtual Address, and building on
32 bit ARM architectures it may be desirable to build a library that uses a v-addr size of
32 bits. Define `USE_32BIT_V_ADDR` to enable this option
Including the Library in an Application
---------------------------------------
The user source code includes a header according to the API to be used:-
- Main C++ decoder library - include `opencsd.h`. Link to C++ library.
- C-API library - include `opencsd_c_api.h`. Link to C-API library.
### Linux build ###
By default linux builds will link against the .so versions of the library. Using the C-API library will also
introduce a dependency on the main C++ decoder .so. Ensure that the library paths and link commands are part of the
application makefile.
To use the static versions use appropriate linker options.
### Windows build ###
To link against the C-API DLL, include the .DLL name as a dependency in the application project options.
To link against the C-API static library, include the library name in the dependency list, and define the macro
`OCSD_USE_STATIC_C_API` in the preprocessor definitions. This ensures that the correct static bindings are declared in
the header file. Also link against the main C++ library.
To link against the main C++ library include the library name in the dependency list.
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