Makefile command to generate compile_commands.json with entries for c++ headers

Makefile-compilecommands.mk

# Addresses an issue where language servers won't know what to do with header files
# since compile_commands.json typically only includes .cc/.cpp/.c files.
#
# Include this file from your main Makefile, or just paste the snippet in.
# To use: 
#     make compile_commands

# Requires bear and compdb
# bear [osx]: brew install bear
# compdb [see https://github.com/Sarcasm/compdb]: pip install compdb

# Assumes build files are in build/ and that `make all` builds the entire project

compile_commands:
	rm -rf build
	bear make -j16 all
	compdb -p ./ list > compile_commands_with_headers.json 2>/dev/null
	rm compile_commands.json 
	mv compile_commands_with_headers.json compile_commands.json

It worked well
thnaks!

Update: Recent versions of clangd (12 and later) seem to work well without compdb. So, this is all that's needed:

compile_commands:
	compiledb make