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platform_build_soong/docs/compdb.md
Alex Light ec868fc42a Add support for generating Compdb file 
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
2018-04-24 08:15:02 -07:00

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Compdb (compile_commands.json) Generator

Soong can generate compdb files. This is intended for use with editing tools such as YouCompleteMe and other libclang based completers.

compdb file generation is enabled via environment variable:

$ export SOONG_GEN_COMPDB=1
$ export SOONG_GEN_COMPDB_DEBUG=1

One can make soong generate a symlink to the compdb file using an environment variable:

$ export SOONG_LINK_COMPDB_TO=$ANDROID_HOST_OUT

You can then trigger an empty build:

$ make nothing

Note that if you build using mm or other limited makes with these environment variables set the compdb will only include files in included modules.