Hi,

As Wilco suggested, the new added strcmp/strncmp inlining should be only enabled with O2 and above.

this is the simple patch for this change.

tested on both X86 and aarch64.

Okay for thunk?

Qing

gcc/ChangeLog:

+2018-07-25  Qing Zhao  <qing.zhao@oracle.com>
+
+       * builtins.c (inline_expand_builtin_string_cmp): Disable inlining
+       when optimization level is lower than 2 or optimize for size.
+       

gcc/testsuite/ChangeLog:

+2018-07-25  Qing Zhao  <qing.zhao@oracle.com>
+
+       * gcc.dg/strcmpopt_5.c: Change to O2 to enable the transformation.
+       * gcc.dg/strcmpopt_6.c: Likewise.
+