Like this (https://gcc.gnu.org/ml/gcc-testresults/2014-09/msg01374.html):
/home/toon/compilers/trunk/gcc/tlink.c:62:16: error: type 'struct
file_hash_entry' violates one definition rule [-Werror=odr]
typedef struct file_hash_entry
^
/home/toon/compilers/trunk/libcpp/files.c:143:8: note: a different type
is defined in another translation unit
struct file_hash_entry
^
/home/toon/compilers/trunk/gcc/tlink.c:64:15: note: the first difference
of corresponding definitions is field 'key'
const char *key;
^
/home/toon/compilers/trunk/libcpp/files.c:145:27: note: a field with
different name is defined in another translation unit
struct file_hash_entry *next;
^
--
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