CI: Bump to Ubuntu 22.04 LTS and Fedora 36

See merge request !735

escl: fix version job.

See merge request !734

Escl: set option if necessary

See merge request !733

Escl: normalize spec

See merge request !731

escl : Remove obselete tag.

See merge request !730

set correct minimum dpi for AV_ASIC_C6 on avision

See merge request !728

Resolve "Fix `mkstemp` error handling"

Closes #149

See merge request !725

Fix Clang warnings

See merge request !727

The CI build jobs targeting Fedora 35 pass (without compiler warnings).
Enforce this going forward.

The output of "net-snmp-config --cflags" can contain optimization flags.
These might not be applicable to the current compiler, causing warnings.

Use PKG_CHECK_MODULES to check for Net-SNMP and obtain the compiler and
linker flags instead, in the same way as for libcurl or poppler-glib.

Introduce a CDB_SIZE() macro similar to that found in sanei/sanei_scsi.c.
This avoids warnings from Clang about unused variables.

backend/Makefile: Fix handling of built sources

See merge request !726

Ensure these files are updated after pixma/pixma.c is changed. Do not
remove them during "make clean" or "make distclean", because they are
part of the source distribution (generated with "make dist"). Display
the relative paths in the build output.

This breaks "make dist" when run locally in the CI container.

Fujitsu / PFU SP30

See merge request !716

avision: Fix issues found by code inspection

See merge request !710

Resolve "avision: Reading unexpected length is not handled correctly"

Closes #584

See merge request !724

Some of the status code checks also check that the returned data is
of the expected size. However, if they are not, it is possible to
return SANE_STATUS_GOOD in error. We should generate an appropriate
error code other than SANE_STATUS_GOOD for this case.

kvs40xx: Return NULL from read_data()

See merge request !722

Fix header file used for poll()

See merge request !723

POSIX specifies the header to include is <poll.h>, not <sys/poll.h>.
This results in a compiler warning with musl libc (on Alpine Linux).

CI: Do not allow build job failures for Debian 11

See merge request !721

With the changes in commit a519a352,
the CI build jobs targeting Debian 11 pass (without compiler warnings).
Enforce this going forward.

configure: Remove --with-group option for device locking

See merge request !713

This reverts commit b458cb14, now that
the CI build jobs targeting Debian 11 pass (without compiler warnings).

pixma:Add TS3400.

See merge request !704

Utilize Automake macros for silent rules output

See merge request !718

CI: Bump all distributions to stable versions

See merge request !705

mustek_usb2: Replace STATUS type with SANE_Status

See merge request !720

escl: convert get_PDF_data() to use GMappedFile and GBytes

See merge request !719

Building with --enable-silent-rules makes it easier to identify errors
or warnings in the build output. Automake provides macros for custom
rules to use, so that they will print a similar message to rules which
run the compiler or linker:

...
  CC       libpieusb_la-pieusb.lo
  CCLD     libpieusb.la
  CCLD     libsane-pieusb.la
  CC       libsane_pixma_la-pixma-s.lo
  GEN      pixma/pixma_sane_options.h
  GEN      pixma/pixma_sane_options.c
  CC       pixma/libpixma_la-pixma.lo
...

This does not change the current output if silent rules are disabled.