Improve diagnostic messages for pkg-config.

Only pass known libraries to pkg-config. Fixes #274. ...

This is yet untested. Also disables calling pkg-config on non-Posix systems.

Missing tilde

Enable library targets for LDC compiler.

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

Merge branch 'dustmite'

Also warn about using certain "buildOptions" in addition to "dflags".

Warn when using -m32/-m64 directly.

Add simple support for --arch and LDC.

Add -defaultlib=x to the flags that need to be passed to the separate linking stage for DMD.

Add support for execution result callbacks in the build generator.

Avoid using the deprecated canFind function.

Fix version(Linux) -> version(linux) - gotta love inconsistent naming...

Use --no-as-needed only in Linux (OSX's LLVM based tool chain doesn't support it).

Add --no-as-needed to avoid linker errors with new GCC versions used as the linker front end. See #199.

Put linker flags (including "libs") after linker "sourceFiles". See #199. ...

Supposedly fixes an issue where a dependency that was build as a static library cannot access symbols of an external library that it needs, because the external library is passed to the linker before the dependency itself.

Implement individual building of dependencies.

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

Enforce build requirements when generating VisualD projects. Fixes #188.

Rename some BuildOptions to avoid D keywords.

Add support for a "mainSourceFile" field. ...

The main source file is used as the root to access the whole package. This is important for dependency based building, such as with RDMD and for special build kinds, such as for a future unit test command. This also improves the robustness of "dub build --rdmd".

Main source files are automatically inferred as follows, if not explicitly given:
 1. search first in "source/", followed by "src/"
 2. take the first match of ("app.d", "main.d", "<pkgname>/main.d", "<pkgname>/<pkgname.d>") as the main file for the automatic "application" configuration
 3. take the first match of ("<pkgname>/all.d", "<pkgname>/package.d", "<pkgname>/<pkgname>.d") as the main file for the automatic "library" configuration

Don't emit -fPIC for DMD on Windows. Fixes #166.

Import and string import files are now added to generated VisualD projects and "dub describe".

Support excluding paths using glob matching.

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.

Issue -shared and -fPIC when building shared libraries with DMD. Fixes #138.

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

fix gdc/ldc build options

Fix "-w" to be the default warnings mode again.

Properly escape arguments in GDC response files. Fixes #125.