Improve cross-compilation support (replace `version` checks by BuildPlatform runtime checks) ...

Also fixes #1249. For LDC as implicit cross compiler, the file
extensions for libraries and object files etc. don't depend on the
compiler, but solely on the target. Targets selected with `--arch` are
correctly probed by dub, so that the parsed `BuildPlatform` represents
the target platform.

Merge pull request #1589 from MartinNowak/filter_version_identifiers ...

Add experimental feature to improve build cache efficiency

Merge pull request #1549 from rtbo/dub_exe_var ...

Adding support for $DUB variable

filter for .d/.di source file endings ...

- to filter out string imports of assets

Fix wrong cast

implement $DUB build variable ...

fix localized import


do not escape DUB path

DUB_EXE in script environment

only read existing source files when inferring version identifiers ...

- i.e. leave out auto-generated sources like unittest runners
- also skip linker files

put version filtering behind an experimental switch

infer unspecified version filters ...

- otherwise of little use as all dependencies need to have specified
  version filters before this can be used
- also version identifiers are fairly easy to grep for
- cache inferred version filters
- still allows explicit specification for packages that use version
  identifiers in mixins

add main source files to root executable earlier

Added experimental build settings to filter applicable version identifiers ...

Those settings allow to filter version identifiers and debug version identifiers
used during building a package. This can improve the build cache efficiency for
libraries that are used by multiple applications with different version
identifiers.

- only merge filters from source dependencies when the
  dependent has an explicit filter list as well

Merge pull request #1582 from andre2007/feature_pre_post_run_command ...

Pre/post run commands added
merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

Fix temp copy files

Pre/post run commands added

Environment variable DUB_PACKAGE_VERSION added

Add basic support for 'building' target type "none" ...

See #97

Support more vars in build settings ...

fixes dlang/dub#1447

Inherit linker sourceFiles as sourceFiles instead of linkerFiles. Fixes #1408. ...

The linkerFiles field was added some time ago in a very partial way and is not used at all, except for the "dub describe" functionality. Keeping inherited linker files in the sourceFiles list fixes the immediate regression introduced by #1263 - properly using linkerFiles throughout the code base should be implemented in a later step.

Reproducing the error is possible by building any vibe.d project that uses OpenSSL on Windows on x86_mscoff or x86_64.

fix #1350 - transitive dependencies (none targets) only included once

rewrite generator targets configuration ...

- as discusses in in https://github.com/dlang/dub/pull/1128 change the
  configuration algorithm to solve polluting sibling dependencies with
  compiler flags (e.g. versions), thus making it possible to better
  reuse cached builds

0. collect dependencies and shallow configuration
1. downwards inherit versions, debugVersions, and inheritable build options
2. define Have_dependency_xyz for all direct dependencies
3. upwards inherit dflags, versions, debugVersions, import paths,
    string import paths (and libs, lflags for static libs)
4. override string import files in dependencies

Rename Path to NativePath. ...

Matches the changes done in vibe.d 0.8.x and vibe-core.

Fix spelling error

make pic inherited for dynamic libraries

spelling fixes

Remove all trailing whitespace ...

> sed 's/[ \t]*$//' -i **/*.d

Remove unused "GeneratorSettings.clean" option.

Remove deprecated functionality to prepare for 1.0.0.

Fix not generating a target for targetType none packages.

Use .getDependencies(config) instead of .dependencies+.hasDependency in Generator.

Move utility functions from dub.compilers.compiler to dub.compilers.utils.