Some tools (i.e. you-complete-me) make use of a 'compdb' file
(compile_commands.json) that records (among other things) the
arguments needed to compile a file. These tools can use this with
libclang to provide semantic completions and perform other IDE
actions. This CL adds support for soong to generate a (simple)
compile_commands.json file.
Test: make SOONG_GEN_COMPDB=1 SOONG_LINK_COMPDB_TO=$ANDROID_BUILD_TOP nothing
examine $ANDROID_BUILD_TOP/compile_commands.json
Change-Id: I751bb344b90dfcdad1dfd71c2a85bacd345f0464
filegroup is a module that contains a list of files, and can be used
to export files across package boundaries. filegroups (and genrules)
can be referenced from srcs properties of other modules using the
syntax ":module".
Test: m -j
Change-Id: I3d6fc4819c0b4225b474e0ad42f0d947f55a5961
