[Buildroot] [PATCH v2 0/5] package/hidapi: allow building without udev

[Tomas Mudrunka <tomas.mudrunka@gmail.com>]

This series allows to use hidapi (libhidapi-libusb) on systems without
udev, by making the hidraw backend optional.

To do so, the package is converted to cmake, which allows to select the
backends to build. Before that, the bogus libgudev dependency is
replaced by the udev one, as hidapi only uses libudev; libmanette, which
relied on hidapi to get libgudev, now selects it directly.

Existing configurations keep building the same hidapi libraries: the
hidraw backend is enabled by default when udev is available.
libmanette, the only in-tree user that requires hidapi-hidraw, now
selects it.

The last patch adds me to DEVELOPERS for hidapi, as we use it in
production on systems without udev and I'm happy to look after it.
Feel free to drop it if not wanted.

Changes v1 -> v2:
 - rebased on top of commit 74def2cdd4 ("package/hidapi: propagate
   dependencies of libgudev")
 - split into four patches (libmanette: select libgudev, libgudev ->
   udev, cmake conversion, optional hidraw backend)
 - libmanette: select BR2_PACKAGE_HIDAPI_HIDRAW, as it only looks up
   hidapi-hidraw.pc
 - new patch: libmanette selects libgudev, which it used to get
   through hidapi
 - new patch: add myself to DEVELOPERS for hidapi
 - drop HIDAPI_SUPPORTS_IN_SOURCE_BUILD = NO, not needed
 - Config.in: use the usual "needs udev /dev management" comment,
   simplify the default of the hidraw option

Tested with utils/test-pkg (default toolchain set):
 - BR2_PACKAGE_HIDAPI=y (no udev): all OK, armv7m-uclibc skipped
   (no NPTL)
 - with eudev and the hidraw backend: OK, except bootlin-armv5-uclibc,
   which fails because wcsdup() is not declared by that toolchain's
   uClibc-ng headers; the same failure happens on master without this
   series (fixed in Buildroot's own uClibc by
   package/uclibc/0007-wchar.h-declare-wcsdup-for-POSIX.1-2008.patch)
 - BR2_PACKAGE_LIBSIGROK=y and BR2_PACKAGE_AVRDUDE=y with hidapi, no
   udev, on bootlin-armv7-glibc: OK (both use hidapi-libusb)

Tomas Mudrunka (5):
  package/libmanette: select libgudev
  package/hidapi: depend on udev instead of libgudev
  package/hidapi: convert to cmake-package
  package/hidapi: make the hidraw backend optional
  DEVELOPERS: add Tomas Mudrunka for hidapi

 DEVELOPERS                       |  3 +++
 package/hidapi/Config.in         | 26 +++++++++++++++++++-------
 package/hidapi/hidapi.mk         | 19 ++++++++++++++-----
 package/libmanette/Config.in     |  4 +++-
 package/libmanette/libmanette.mk |  9 ++-------
 5 files changed, 41 insertions(+), 20 deletions(-)

-- 
2.56.1

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