[Bug c/66066] [6 Regression] r222889 causes bogus error: initializer element is not constant

["kugan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66066

kugan at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kugan at gcc dot gnu.org

--- Comment #5 from kugan at gcc dot gnu.org ---
I ran into this today when I created a cross compiler for aarch64-linux-gnu. It
also happens with arm. As Richard Biener suggested, -pedantic helps. How about
this:

diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index 3fcb7c2..d5d82fd 100644
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -10702,7 +10702,7 @@ build_binary_op (location_t location, enum tree_code
code,
            {
              /* Don't reject a left shift of a negative value in a context
                 where a constant expression is needed in C90.  */
-             if (flag_isoc99)
+             if (flag_isoc99 && pedantic)
                int_const = false;
              if (c_inhibit_evaluation_warnings == 0)
                warning_at (location, OPT_Wshift_negative_value,