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diff --git a/gcc/testsuite/gfortran.dg/c_sizeof_3.f90 b/gcc/testsuite/gfortran.dg/c_sizeof_3.f90
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+! { dg-do link }
+!
+! PR fortran/40568
+!
+! Module checks for C_SIZEOF (part of ISO_C_BINDING)
+!
+subroutine test
+use iso_c_binding, only: foo => c_sizeof, bar=> c_sizeof, c_sizeof, c_int
+integer(c_int) :: i
+print *, c_sizeof(i), bar(i), foo(i)
+end
+
+use iso_c_binding
+implicit none
+integer(c_int) :: i
+print *, c_sizeof(i)
+call test()
+end