Add creating compile_commands.json to the build system.

I'm really not proud of how I did this though.

It must be run from the same environment as one's editor (ie. not in the
docker image) so that the paths are correct.

.gitignore

@@ -42,6 +42,7 @@ packaging/msi/FDBInstaller.wix*
 .ccache
 .deps/
 .objs/
+.cmds/
 bindings/c/fdb_c.symbols
 bindings/go/build
 bindings/go/godoc
@@ -71,6 +72,7 @@ FoundationDB.xcodeproj
 foundationdb.VC.db
 foundationdb.VC.VC.opendb
 ipch/
+compile_commands.json
 
 # Temporary and user configuration files
 *~

Makefile

@@ -160,6 +160,11 @@ $(CPP_MK_GENERATED): build/vcxprojtom4.py build/vcxproj.mk Makefile
 
 DEPSDIR := .deps
 OBJDIR := .objs
+CMDDIR := .cmds
+
+COMPILE_COMMANDS_JSONS := $(addprefix $(CMDDIR)/,$(addsuffix /compile_commands.json,${CPP_PROJECTS}))
+compile_commands.json: build/concatinate_jsons.py ${COMPILE_COMMANDS_JSONS}
+	@build/concatinate_jsons.py ${COMPILE_COMMANDS_JSONS}
 
 include $(MK_INCLUDE)
 
@@ -169,6 +174,7 @@ clean: $(CLEAN_TARGETS) docpreview_clean
 	@rm -rf $(DEPSDIR)
 	@rm -rf lib/
 	@rm -rf bin/coverage.*.xml
+	@rm -rf $(CMDDIR) compile_commands.json
 	@find . -name "*.g.cpp" -exec rm -f {} \; -or -name "*.g.h" -exec rm -f {} \;
 
 targets:

build/concatinate_jsons.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python
+
+import sys
+import json
+
+lst = []
+for filename in sys.argv[1:]:
+    commands = json.load(open(filename))
+    lst.extend(commands)
+
+json.dump(lst, open("compile_commands.json", "w"))

build/project_commands.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+
+import sys
+import os
+import os.path
+import json
+
+flags = sys.argv[1]
+all_files = sys.argv[2]
+outfile = sys.argv[3]
+
+cwd = os.getcwd()
+
+commands = []
+for fname in all_files.split(' '):
+  d = {}
+  d["directory"] = cwd
+  if fname.endswith("cpp") or fname.endswith(".h"):
+    compiler = "clang++ -x c++ "
+  if fname.endswith("c"):
+    compiler = "clang -x c "
+  d["command"] = compiler + flags.replace('-DNO_INTELLISENSE', '').replace("/opt/boost", cwd+"/../boost") + "-c " + fname
+  d["file"] = fname
+  commands.append(d)
+
+json.dump(commands, open(outfile, "w"))

build/vcxproj.mk

@@ -58,6 +58,10 @@ GENNAME()_DEPS := $(addprefix $(DEPSDIR)/,$(GENNAME()_BUILD_SOURCES:=.d))
 
 GENNAME: GENTARGET
 
+$(CMDDIR)/GENDIR/compile_commands.json: build/project_commands.py ${GENNAME()_ALL_SOURCES}
+	@mkdir -p $(basename $@)
+	@build/project_commands.py "$(CFLAGS) $(CXXFLAGS) $(GENNAME()_CFLAGS) $(GENNAME()_CXXFLAGS)" "$(GENNAME()_ALL_SOURCES)" "$@"
+
 -include $(GENNAME()_DEPS)
 
 $(OBJDIR)/GENDIR/%.actor.g.cpp: GENDIR/%.actor.cpp $(ACTORCOMPILER)