configure: test for -Wfloat-conversion

supported by clang, gcc-4.9+

Change-Id: I893766de7307fef9a8b68c0cfae137c9d3b0dbe8
(cherry picked from commit 889ed5b158fc280927f2de9172d48245c3b735a7)

diff --git a/configure b/configure
index 04287e54e40b932184c9db3a4a9542e4a858ba36..a50db7404b25d7121568bc731c08156ff8508fac 100755 (executable)
--- a/configure
+++ b/configure
@@ -586,6 +586,7 @@ process_toolchain() {
         check_add_cflags -Wall
         check_add_cflags -Wdeclaration-after-statement
         check_add_cflags -Wdisabled-optimization
+        check_add_cflags -Wfloat-conversion
         check_add_cflags -Wpointer-arith
         check_add_cflags -Wtype-limits
         check_add_cflags -Wcast-qual