Introduce a logging system.

[achan1989]

This pull request makes progress on #183.

I've replaced the existing print/eprint calls with the appropriate logging macros, and arbitrarily chose env_logger to handle the logging.

This should be functionally identical to the branch point, although the format of the logging output is different -- it's now of the form <SEVERITY> svd2rust: <message>.

[ryankurte]

bors try

[bors]

try

Build failed

• continuous-integration/travis-ci/push

[achan1989]

I think that might be an issue in the cortex-m-rt crate, introduced between versions 0.6.3 and 0.6.4? This older build managed to compile cortex-m-rt 0.6.3

[ryankurte]

Hmm, it does look like it is somewhere there, I'm unfortunately not knowledgeable enough about macros to fix it, but I think I've tracked down the problem. Also, thanks for opening the PR!

Travis Error when running TRAVIS_OS_NAME=linux TARGET=x86_64-unknown-linux-gnu VENDOR=Nordic ci/script.sh:

error[E0432]: unresolved import `macros::entry`
   --> /home/travis/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/cortex-m-rt-0.6.4/src/lib.rs:397:18
    |
397 | pub use macros::{entry, exception, pre_init};
    |                  ^^^^^ no `entry` in the root
error[E0432]: unresolved import `macros::exception`
   --> /home/travis/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/cortex-m-rt-0.6.4/src/lib.rs:397:25
    |
397 | pub use macros::{entry, exception, pre_init};
    |                         ^^^^^^^^^ no `exception` in the root
error[E0432]: unresolved import `macros::pre_init`
   --> /home/travis/.cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/cortex-m-rt-0.6.4/src/lib.rs:397:36
    |
397 | pub use macros::{entry, exception, pre_init};
    |                                    ^^^^^^^^ no `pre_init` in the root
error: aborting due to 3 previous errors

cortex-m-rt#L391:

extern crate cortex_m_rt_macros as macros;
...
pub use macros::{entry, exception, pre_init};

I have reproduced the issue on my machine using TARGET=x86_64-apple-darwin VENDOR=Nordic TRAVIS_OS_NAME=osx bash ci/script.sh building with cargo 1.29.0 (524a578d7 2018-08-05) and confirmed to be using the packages cortex-m-rt v0.6.4 and cortex-m-rt-macros v0.1.2 as in the failed test.

The issue does not seem occur with cargo 1.29.0-nightly (6a7672ef5 2018-08-14) or newer, it seems to me that the changes to cortex-m v0.6.4 requires newer language features.

@japaric does this seem like a reasonable conclusion / do you have any suggestions on how to fix it?

[japaric]

TRAVIS_OS_NAME=linux TARGET=x86_64-unknown-linux-gnu VENDOR=Nordic sh ci/script.sh works fine for me on this PR after rebasing, both on stable and nightly.

[mathk]

bors try

[bors]

try

Merge conflict

[mathk]

@achan1989 can you do a rebase/merge? Thanks

[therealprof]

@achan1989 Sorry for the long delay. Are you still interested in this? If so would you please update the PR?

[achan1989]

Oops. It's been a while, but I'll try to update.

[achan1989]

bors try

[bors]

🔒 Permission denied

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[ryankurte]

bors try

[bors]

try

Build succeeded

• continuous-integration/travis-ci/push

[ryankurte]

bors r+

[bors]

Build succeeded

• continuous-integration/travis-ci/push