CDRIVER-669: Turn compiler warnings into errors for GCC on Evergreen

Author: bjori

.mci.yml

@@ -82,9 +82,9 @@ c_driver_variables:
   ## Common sets of CFLAGS
   cflags:
     standard: &cflags_64
-      cflags: "-m64 -march=x86-64"
+    cflags: "-m64 -march=x86-64 -Werror"
     standard_32: &cflags_32
-      cflags: "-m32 -march=i386"
+      cflags: "-m32 -march=i386 -Werror"
     osx_108: &cflags_osx_108
       cflags: "-m64 -march=x86-64"