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diff --git a/gcc/testsuite/gfortran.dg/c_kind_tests_3.f03 b/gcc/testsuite/gfortran.dg/c_kind_tests_3.f03
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+! { dg-do compile }
+!
+! PR 47023: [4.6/4.7 regression] C_Sizeof: Rejects valid code
+!
+! Contributed by <florian.rathgeber@gmail.com>
+
+ use iso_c_binding
+ real(c_double) x
+ print *, c_sizeof(x)
+ print *, c_sizeof(0.0_c_double)
+end