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

Fix naming convention for the compiler handler classes and add documentation.

fix gdc/ldc flags for ddox/docs ...

- it seems that gdc cannot currently generate a
  single json file with all output though
- remove dummy doc files after as postBuildStep

Merge pull request #679 from Abscissa/fix624 ...

Fix #624: --data=libs should output in compiler-format, not linker fo…

add buildType profile-gc ...

- allows to dub build -b profile-gc to
  trace memory allocations with dmd

Fix #624: --data=libs should output in compiler-format, not linker format.

Add support form -marm/-mthumb switches to GdcCompiler.

Use -fPIC for shared libraries compiled with LDC/GDC, too.

Change Build(Options/Requirements) to BitFlags.

Fixed issue where static libraries would be generated instead of object files in singleFile build mode ...

+ Added object TargetType that is used during singleFile build mode

Use unique filenames for temporary files ...

Partial fix to #482

Various small fixes ...

- fix computeBuildID for --compiler=/my/path;
- dub compiled with ldc tried to invoke ldc as default binary instead of ldc2;
- dmd: Don't generate anything;
- gdc: Do not link, only generate an object;

Merge pull request #387 from ibuclaw/gdcopts ...

Add some missing build options for gdc

faster determinePlatform ...

- 310ms -> 7ms

- don't link dub_platform_probe

- avoid phobos imports in the probe file

Add some missing build options for gdc

Merge pull request #380 from Geod24/ct-platform-probe ...

Make the platform probe the file at CT, hence allow it to work for cross-compilation.

Make the platform probe the file at CT, hence allow it to work for X compilation

Invoke the binary for linking, not the name

Implement separate linking on gdc

Fix output flags for compilers != dmd

Make prepareBuildSettings, extractBuildOptions and setTarget const

Use executeShell() to invoke the compiler. See #356. ...

execute() doesn't support running scripts with shebang lines. Still needs to be actually tested with a script on Linux/OS X.

Ensure all files end with a newline

Compilers: Add arch support for gdc

Output -l flags on the compiler command line after all source files. Fixes #281.

Add support for execution result callbacks in the build generator.

Rename BuildOptions.noBoundsChecks to noBoundsCheck to be consistent with BuildRequirements.requireBoundsCheck.

Rename some BuildOptions to avoid D keywords.

Remove dub.internal.std.process compatibility code as it doesn't support browse() and the compile status on older DMD versions isn't tracked anyway.

Fix handling of lib flags on Windows for GDC/LDC.