[compilation db] fix problems with buck compilation database integration

Summary: This fixes compilation database integration with buck. Some directories from command don't exist (specifically ones that should hold `dep.tmp`). To workaround this problem, create those directories when invoking clang command

Reviewed By: jvillard, martinoluca

Differential Revision: D4403580

fbshipit-source-id: 57bcfc7

infer/src/clang/ClangCommand.re

@@ -88,6 +88,12 @@ let clang_cc1_cmd_sanitizer cmd => {
     if (String.equal option "-arch" && String.equal arg "armv7k") {
       "armv7"
       /* replace armv7k arch with armv7 */
+    } else if (
+      String.is_suffix arg suffix::"dep.tmp"
+    ) {
+      /* compilation-database-buck integration produces path to `dep.tmp` file that doesn't exist. Create it */
+      Unix.mkdir_p (Filename.dirname arg);
+      arg
     } else if (
       String.equal option "-isystem"
     ) {