1006 - Nothing defined to be built.

Description
A target was configured, but no inputs (or rules to find inputs) were provided. This Function can therefore never result in any useful build output.
Example
Config:
ObjectList( 'lib' ) { .Compiler = 'cl.exe' .CompilerOutputPath = 'tmp/' .CompilerOptions = '%1 %2' // No inputs are specified for this library }
Output:
c:\Test\fbuild.bff(1):(1) FASTBuild Error #1006 - Library() - Nothing defined to be built. Library( 'lib' ) ^ \--here
Fix:
ObjectList( 'lib' ) { .Compiler = 'cl.exe' .CompilerOutputPath = 'tmp/' .CompilerOptions = '%1 %2' .CompilerInputPath = 'src/' // A valid input was provided }