[unittest] Remove fbl header dependency

This was previously depended on via MODULE_COMPILEFLAGS, which is not
respected when a package is exported.

This probably needs some rethinking in general, but for this case it's
easy enough to just use the limits.h version to keep the spice
flowing^W^W rollers rolling.

Change-Id: Ief5083ce485421d3c7e25b9801968bd053022e43

[ulib][unittest] Add watchdog timer

If the timer goes off before the test completes then the process is terminated.

A new option --w <seconds> is added to runtests to set the timeout.
A value of zero disables the timeout.

This is passed to tests via the RUNTESTS_WATCHDOG_TIMEOUT env var.

New -w option manually tested with:
$ runtests -w
$ runtests -w ""
$ runtests -w -1
$ runtests -w 123foo
$ runtests -w 2147483648
$ runtests -w 0x80000000
All flag an error as expected, and these work:
$ runtests -w 2147483647
$ runtests -w 0x7fffffff
And this works and triggers timeouts:
$ runtests -w 2

ZX-2018 #done

Change-Id: Ia9bc9e29ce93da3973ac58f63393096b5c836d37

[unittest] Make the perftest library usable from the GN build (in Garnet)

perftest depends on unittest, so to make perftest usable from the GN
build we must also make unittest usable there by adding a
MODULE_PACKAGE declaration (see zircon/public/README.md). perftest
already has a MODULE_PACKAGE declaration.

ZX-1715

Change-Id: I27d16dfed9856a77dfa4f37826db92cd333d4880

[tests] Convert unittest library to C++ source.

Run clang-format. NULLs, casts, and some typedefs were updated, but otherwise the
code change should be minimal.

This preserves C compat in the headers and doesn't use any C++ library functions.

Change-Id: I0ac80611bbaf9c0b9adfed65f6ad6fb22afea461

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[zircon][mxtl->fbl] Rename mxtl to fbl

Change-Id: Ie21b6498e1bfb0a7fa0315e40b9e5c3ee78646be

[build][groups] annotate 'misc' and 'test' modules

This allows us to generate a bootdata.bin which excludes them,
reducing it from 4.52MB to 2.65MB

The default bootdata.bin still includes all modules.

Change-Id: If13bfcacba9386a691e6b7c380eed53d67bb44eb

[unittest] Support compiling tests for the host.

Note that crash tests are not supported on the host.

Change-Id: I6bf47041344c6df4b5674d46e7d35777fa15599d

[unittest] Run an exception handler thread so crashes
don't bubble up to system handler.

To enable the exception handler, a test should be run
with RUN_TEST_ENABLE_CRASH_HANDLER.

Tests can then call REGISTER_CRASH to register any
processes that are expected to crash.

If a crash was registered and occurs, the exception is
caught and the test resumes.

If a crash was not registered, the exception will be passed up to
crashlogger and then the test will fail immediately.

At the conclusion of the test, if a crash was registered
and did not occur, the test will fail.

MG-802

Change-Id: Ie1a7dd3db33109e4c5ea9cfef75097df0365b35b

[ulib] Merge ulib/hexdump into ulib/pretty

Change-Id: I194595de04e83178121c455f31732d1046448850

[build] flatten the build

Previously we treated kernel/, system/, and third_party/ as
overlays on a shared namespace. This required the concept
of "canonical" module names, and a lot of complexity to ensure
that things didn't collide and the build worked.

This change gets rid of that, no longer passes -I to make,
so that include directives from our *.mk files do not magically
wildcard across various paths, etc.

The most user-visible change is that everywhere where a module
name is specified (MODULE_DEPS, MODULE_LIBS, etc), full module
names like kernel/lib/io or system/ulib/mxio must be used instead
of previously-allowed "short" names like lib/io and ulib/mxio.

The build output still has a similar shape, but the first segment
of the module path (kernel/, system/, or third_party/) is no
longer elided under $(BUILDDIR)

Change-Id: I525aba1da1c86eb7a86007bddc669f7eeebfedd5

[build][musl] refer to musl libc as ulib/c

This makes the build rules and the intermediate
output files easier to understand, without having
to modify the path where musl libc lives.

The biggest observeable difference is the build
intermediate files:

$ ls build-magenta-pc-x86-64/ulib/c
config-module.h libc.abi.h libc.abi.stamp libc.so libc.so.id libc.so.strip
libc.a libc.abi.o libc.a.opts libc.so.abi libc.so.opts third_party

which previously were at build-magenta-pc-x86/ulib/musl
and named libmusl.*

and the replacing of ulib/musl with ulib/c in the library
dependencies of all the rules.mk files (the vast bulk of
this change)

Change-Id: If9c5d522099d2c9ac5bdb666b8e67a2eb3d316ee

[ddk] Move hexdump utils to a separate library

Change-Id: I6a2f061f886fc98db656fc4f0a991887f11c3ba9

[system] remove unneeded deps on libruntime

Change-Id: Ia612d777b36dada7fda112aa41a6d7a49a212da0

[system] align license and license banners with Fuchsia

This adjusts the Magenta userspace code to match the prevailing
license in Fuchsia (three-clause BSD), using the same banner
and license text.

Change-Id: I6b6d79435c5dbaa32027888874849e4f47aaa7be

[system][ulib][test-utils] Create test-utils library.

test-utils is moved from unittest to its own library.
The reason for this is that test-utils uses mxio but
unittest cannot use mxio. See system/ulib/unittest/README.md
and system/utest/core/README.md.

Change-Id: Id79ea8a4cf8cc948994cef5bcc3dfe035e90bff4

[system][unittest] Some additions to test-utils.

tu_syscall_fail renamed to tu_fatal.
New functions: tu_launch tu_launch_mxio_etc tu_io_port_create
tu_handle_get_basic_info

Change-Id: I6ba9cf58226fc993633b388707cdb4b892b4cf80

[build] make musl-static the exception rather than musl-shared

This makes the common uapp, ulib, or utest rules.mk much more
comprehensible. Some day we'll eliminate the need for -static
entirely, but that requires some deeper refactoring.

Change-Id: Ifcdb635e5af7bf0b033632358164c3042e7e6d4a

[build] tidy up the user build some more

Change-Id: Ifba635a3b473df533e2fefc4d52251e8d20a5582

[uapp] [utest] Switch most uapp and utest builds to dynamic linking

Nearly every uapp and utest that can be dynamically linked is now.
The mxr-tls test is omitted because it's broken when dynamically
linked; that will probably be moot after the forthcoming TLS revamp.

A few test helper programs cannot use dynamic linking as written
because they get run with a nonstandard bootstrap message that does
not include the magic required for the dynamic linker's startup.

I didn't touch anything using ulib/ddk because I didn't bother to
figure out how that fits together.

Change-Id: I93b08960d946e23cd4ac89216e6d32789f99405a

[system][ulib] Add test-utils to unittest.

This is a collection of utilities for use by utest.
Typically they are wrappers on system calls, and other functions,
to free the caller from having to check the return code (in such
cases where there is no point in continuing with the test if the
call fails).

Change-Id: I2c6f18ce0202abdfc001fae23c00439411da181a

[mxu][unittest] move hexdump utils to unittest, goodbye libmxu

Change-Id: Ib726b94564c5718e1a6c28545da820d1c75394b0

[ulib][unittest] Move unittest into its own library

Change-Id: I1586278e3bbb6ceacd26a1342985922dc8861cf7