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The _cpp_trigraph_map initialization used to be done for C99+ using designated initializers, but can't be done that way for C++ because the designated initializer support in C++ as array designators are just an extension there and don't allow skipping anything nor going backwards. But, we can get the same effect using C++14 constexpr constructor. With the following patch we get rid of the runtime initialization and the array can be in .rodata. 2024-10-07 Jakub Jelinek <jakub@redhat.com> * internal.h (_cpp_trigraph_map_s): New type for C++14 or later. (_cpp_trigraph_map_d): New variable for C++14 or later. (_cpp_trigraph_map): Define to _cpp_trigraph_map_d.map for C++14 or later. * init.cc (init_trigraph_map): Define to nothing for C++14 or later. (TRIGRAPH_MAP, END, s): Define differently for C++14 or later.