scripts: compiler.h: support BSDs as well ...

The BSDs have their endianness changing functions in <sys/endian.h> and
define both _BYTE_ORDER as well as BYTE_ORDER (if strict POSIX conformance
isn't requested). Extend the header to compile, so it supports these
platforms as well.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: compiler.h: use Linux <endian.h> as default ...

Other systems mimic the GNU endianness headers, e.g. Cygwin. Instead of
explicitly listing them, just make the Linux case the default case by
moving it into the #else clause.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: compiler.h: add endianness helpers for macOS ...

These are taken from Mathias Panzenböck's portable_endian.h[1]
which he had released it into the public domain.

[1]: https://gist.github.com/panzi/6856583

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: compiler.h: don't include <stdint.h> twice ...

We already include it a few lines further down, so drop it at this
location.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts/compiler.h: inline functions in headers must be static ...

Without this building bareboxenv-target with gcc 7.3 fails with:

  CC      scripts/bareboxenv-target
/tmp/cc9G2oOY.o: In function `file_action':
bareboxenv.c:(.text+0x14): undefined reference to `xzalloc'
/tmp/cc9G2oOY.o: In function `concat_path_file':
bareboxenv.c:(.text+0xf4): undefined reference to `xmalloc'
/tmp/cc9G2oOY.o: In function `envfs_save':
bareboxenv.c:(.text+0x5b4): undefined reference to `xzalloc'
/tmp/cc9G2oOY.o: In function `envfs_load':
bareboxenv.c:(.text+0x7d8): undefined reference to `xmalloc'
collect2: error: ld returned 1 exit status

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: bareboxcrc32 as host and target userspacetool ...

This patch adds the crc32 command to be build
as host and optionally as target tool.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts/compiler.h: fixup endianess defines on OS X ...

Signed-off-by: Dirk Hörner <dirker@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

host: introduce compiler.h to handle host include ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>