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This patch recursively tests every assignment (of a constructor to a designator) to ensure the types are GCC equivalent. If they are equivalent then it uses gimple assignment and if not then it copies a structure by field and uses __builtin_strncpy to copy a string cst into an array. Unions are copied by __builtin_memcpy. gcc/m2/ChangeLog: PR modula2/118600 * gm2-compiler/M2GenGCC.mod (PerformCodeBecomes): New procedure. (CodeBecomes): Refactor and call PerformCodeBecomes. * gm2-gcc/m2builtins.cc (gm2_strncpy_node): New global variable. (DoBuiltinStrNCopy): New function. (m2builtins_BuiltinStrNCopy): New function. (m2builtins_init): Initialize gm2_strncpy_node. * gm2-gcc/m2builtins.def (BuiltinStrNCopy): New procedure function. * gm2-gcc/m2builtins.h (m2builtins_BuiltinStrNCopy): New function. * gm2-gcc/m2statement.cc (copy_record_fields): New function. (copy_array): Ditto. (copy_strncpy): Ditto. (copy_memcpy): Ditto. (CopyByField_Lower): Ditto. (m2statement_CopyByField): Ditto. * gm2-gcc/m2statement.def (CopyByField): New procedure function. * gm2-gcc/m2statement.h (m2statement_CopyByField): New function. * gm2-gcc/m2type.cc (check_record_fields): Ditto. (check_array_types): Ditto. (m2type_IsGccStrictTypeEquivalent): Ditto. * gm2-gcc/m2type.def (IsGccStrictTypeEquivalent): New procedure function. * gm2-gcc/m2type.h (m2type_IsAddress): Replace return type int with bool. Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>
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