Add tool to generate compile_commands.json for bsp qemu-virt64-riscv

Author: lygstate

bsp/qemu-virt64-riscv/SConstruct

@@ -1,6 +1,7 @@
 import os
 import sys
 import rtconfig
+import scons_compiledb
 
 from rtconfig import RTT_ROOT
 
@@ -11,13 +12,17 @@ TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
 DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
+    COMPILATIONDB_USE_ABSPATH = True,
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
     CXX = rtconfig.CXX, CXXFLAGS = rtconfig.CXXFLAGS,
     AR = rtconfig.AR, ARFLAGS = '-rc',
     LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
 env.PrependENVPath('PATH', rtconfig.EXEC_PATH)
 env['ASCOM'] = env['ASPPCOM']
+env.Tool('compilation_db')
+cdb = env.CompilationDatabase('compile_commands.json')
+Alias('cdb', cdb)
 
 Export('RTT_ROOT')
 Export('rtconfig')