patch 8.0.1677: no compiler warning for wrong format in vim_snprintf() commit https://github.com/vim/vim/commit/ea39176baab52b646d1e2676e662def718ddd365 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Apr 8 13:07:22 2018 +0200 patch 8.0.1677: no compiler warning for wrong format in vim_snprintf() Problem: No compiler warning for wrong format in vim_snprintf(). Solution: Add printf attribute for gcc. Fix reported problems.

--- a/src/json.c
+++ b/src/json.c
@@ -217,7 +217,7 @@ json_encode_item(garray_T *gap, typval_T
 
 	case VAR_NUMBER:
 	    vim_snprintf((char *)numbuf, NUMBUFLEN, "%lld",
-						    val->vval.v_number);
+						(long long)val->vval.v_number);
 	    ga_concat(gap, numbuf);
 	    break;