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README: explicit statement on single source build #370

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README: explicit statement on single source build #370

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35 changes: 23 additions & 12 deletions BUILD.md
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Expand Up @@ -8,7 +8,7 @@
* [FreeBSD](#freebsd)
* [Mac](#mac)
* [Windows](#windows)
* [Integrating hidapi directly into your source tree](#integrating-hidapi-directly-into-your-source-tree)
* [Embedding HIDAPI directly into your source tree](#embedding-hidapi-directly-into-your-source-tree)
* [Building the manual way on Unix platforms](#building-the-manual-way-on-unix-platforms)
* [Building on Windows](#building-on-windows)

Expand Down Expand Up @@ -68,19 +68,30 @@ On Mac make sure you have XCode installed and its Command Line Tools.
On Windows you just need a compiler. You may use Visual Studio or Cygwin/MinGW,
depending on which environment is best for your needs.

## Integrating HIDAPI directly into your source tree
## Embedding HIDAPI directly into your source tree

Instead of using one of the provided build systems, you may want to integrate
HIDAPI directly into your source tree.
Generally it is not encouraged to do so, but if you must, all you need to do:
- add a single source file `hid.c` (for a specific backend);
- setup include directory to `<HIDAPI repo root>/hidapi`;
- add link libraries, that are specific for each backend.
Instead of using one of the provided standalone build systems,
you may want to integrate HIDAPI directly into your source tree.

Check the manual makefiles for a simple example/reference of what are the dependencies of each specific backend.
---
If your project uses CMake as a build system, it is safe to add HIDAPI as a [subdirectory](BUILD.cmake.md#hidapi-as-a-subdirectory).

---
If _the only option_ that works for you is adding HIDAPI sources directly
to your project's build system, then you need:
- include a _single source file_ into your project's build system,
depending on your platform and the backend you want to use:
- [`windows\hid.c`](windows/hid.c);
- [`linux/hid.c`](linux/hid.c);
- [`libusb/hid.c`](libusb/hid.c);
- [`mac/hid.c`](mac/hid.c);
- add a [`hidapi`](hidapi) folder to the include path when building `hid.c`;
- make the platform/backend specific [dependencies](#prerequisites) available during the compilation/linking, when building `hid.c`;

NOTE: if your have a CMake-based project, you're likely be able to use
HIDAPI directly as a subdirectory. Check [BUILD.cmake.md](BUILD.cmake.md) for details.
NOTE: the above doesn't guarantee that having a copy of `<backend>/hid.c` and `hidapi/hidapi.h` is enough to build HIDAPI.
The only guarantee that `<backend>/hid.c` includes all nesessary sources to compile it as a single file.

Check the manual makefiles for a simple example/reference of what are the dependencies of each specific backend.

## Building the manual way on Unix platforms

Expand All @@ -106,5 +117,5 @@ To build HIDAPI using MinGW or Cygwin using Autotools, use a general Autotools

Any windows builds (MSVC or MinGW/Cygwin) are also supported by [CMake](BUILD.cmake.md).

If you are looking for information regarding DDK build of HIDAPI
If you are looking for information regarding DDK build of HIDAPI:
- the build has been broken for a while and now the support files are obsolete.
5 changes: 3 additions & 2 deletions README.md
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HIDAPI is a multi-platform library which allows an application to interface
with USB and Bluetooth HID-Class devices on Windows, Linux, FreeBSD, and macOS.
HIDAPI can be either built as a shared library (`.so`, `.dll` or `.dylib`) or
can be embedded directly into a target application by adding a single source
file (per platform) and a single header.
can be embedded directly into a target application by adding a _single source_
file (per platform) and a single header.<br>
See [remarks](BUILD.md#embedding-hidapi-directly-into-your-source-tree) on embedding _directly_ into your build system.

HIDAPI library was originally developed by Alan Ott ([signal11](https://github.com/signal11)).

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