recompile only if new option effects code generation

drop warnings for `export_all` in test profile

update meck for otp20

Bare compiler: support multiple paths wildcards.

Similarly to PATH env variable, this allows to pass paths to bare
compiler which do not fit nicely into a single wildcard structure.
Colon (":") is used as separator.

This provides more flexibility when rebar is run in offline/hermetic
environment, e.g. #958 and #1281.

Rebar3 shell supports booting applications with type 'none'

I noticed this when trying to include entop in a release. Entop uses
cecho which takes over the terminal, so you do not want it loaded or
started.  According to http://erlang.org/doc/man/rel.html, when you
specify a Type of none it should not load or start, but the code for
it's modules should be loaded.  This patch ensures the code is not
loaded or started, but doesn't do anything with the code paths.
At the very least this allows me to start a shell in the case where
I have an application of type none, and the application is neither
loaded nor started.

Prevent xref crashes with undef behaviours

When a given behaviour module does not exist, rebar3 brutally crashes.
This patch makes it so instead, there is a warning output menitoning the
missing behaviour, and this one is omitted from the unused function
calls check. This means that unused calls will instead be shown for the
module implementing a non-existing behaviour, as if no behaviour were
declared in the first place.

the new added PATH value should be in the first position, in case the…

Fix xref compile hook on deps

If xref analysis is being run by a dependency during its compilation
phase, the xref provider will try to add that deps' parents to the check
job while the ebin/ directories for them do not exist. This causes a
crash.

This patch makes it so directories are only added if they are existing,
preventing failure on any compile hook for dependencies and allowing
successful compilation as a best effort.

reset hooks under profiles for application opts

Avoid reversing relx overlays.

This mostly moves a lists:reverse/1 which ensures that profile overlays
are run first but keeps the order of overlays otherwise.

Includes Relx fixes

Signed-off-by: Fred Hebert <mononcqc@ferd.ca>

upgrade relx to 3.23.0

Patches:

- Try to start epmd when distribution fails
- Allow non-default profile deps upgrade
- Switch default license in templates to Apache 2.0, and hook it up in
  the .app file
- Fix git SHA comparisons for dep update
- Let relx know about rebar-specified erl_opts
- Use rm_rf instead of ec_file:delete, fixing some deps-related issues
  on Windows
- Handle internal CT failures
- Fix profile merging of erl_first_files options
- Fix CT output in skipped test cases and failing end of function
  hooks
- Officially drop R15 support, since its SSL libs can no longer talk
  to hex.pm
- REBAR_COLOR supports all ec_cmd_log intensity options, allowing the
  none value to disable all colors without dropping termcap support
- Bump relx to 3.22.4

The one new feature supported here is for the interactive shell:

- Support commands in the shell such as r3:Command(),
  r3:Command("--args=as a string"), or r3:Command(Namespace, "--args=as a
  string"), instead of just r3:do(Command).

Try to start epmd when distribution fails

We do it by calling os:cmd on a named shell so that the automated daemon
rules work for rebar3 as well.

Allow profile deps upgrade

Prevents showing false upgrade messages when upgrading in a non-default
profile. Also shows an info message explaining default deps don't get
updated in a non-default upgrade.

Match template license app to default license, switch default to Apache 2.0

Fix git SHAs comparison for update.

Let relx know about application erl opts

Use rm_rf instead of ec_file:delete.

In contrast to `ec_file:delete`, `rebar_file_utils:rm_rf` will also delete
write-protected files on Windows which is needed for git object files.

Fixes #1483.

Run Travis tests on latest OTP19.3

This is so that some of them can be enforced
(such as warnings_as_errors) on relx's task like
generating a release or a release upgrade.

Bump cth_readable to 1.2.6

The default license created with rebar3 templates is a BSD 3 clause
license. However the .app.src file generated do not include the license
there.

This adds the license type, fixing #1447.

This fixes the output of end_per_testcase crash notifications when the
test passes.

This also detect an issue of the kind with rebar_pkg_SUITE which is now
fixed.

Handle internal CT failures

This is based on issue #1517 where out of nowhere, CT has returned a
user's error code directly. This in turn caused a crashdump in rebar3
itself.

This patch handles the unexpected cases by:

a) not trying to format them
b) converting them to an error whenever they happen

The execution flow is still interrupted, but we should fail with a
clearer error than a crashdump.

Issue #1416: Merge erl_files_first separately and avoid sorting.