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GCC 10 enables -fno-common by default. This resulted in multiple definition linker errors since a global variable was declared and defined in a header file: ld: libsim.a(idecode.o):sim/v850/idecode.h:71: multiple definition of `idecode_issue'; libsim.a(irun.o):sim/v850/idecode.h:71: first defined here ld: libsim.a(engine.o):sim/v850/idecode.h:71: multiple definition of `idecode_issue'; libsim.a(irun.o):sim/v850/idecode.h:71: first defined here ld: libsim.a(support.o):sim/v850/idecode.h:71: multiple definition of `idecode_issue'; libsim.a(irun.o):sim/v850/idecode.h:71: first defined here ld: libsim.a(semantics.o):sim/v850/idecode.h:71: multiple definition of `idecode_issue'; libsim.a(irun.o):sim/v850/idecode.h:71: first defined here sim/igen PR sim/26194 * lf.h (lf_get_file_type): Declare. * lf.c (lf_get_file_type): Define. * gen-idecode.c (print_idecode_issue_function_header): Use lf_get_file_type() to issue an extern variable declaration in case of header files.