cmake/compiler.cmake: provide compile_commands.json for use by tools (#4014)

`compile_commands.json` allows LSPs and other tools to better interact
with the code.

Signed-off-by: David Aguilar <davvid@gmail.com>

Author: davvid

src/cmake/compiler.cmake

@@ -622,6 +622,10 @@ else ()
 endif ()
 
 
+###########################################################################
+# Generate compile_commands.json for use by editors and tools.
+set (CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
 
 ###########################################################################
 # Macro to install targets to the appropriate locations.  Use this instead