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8378991cba
Fedora 33 uses GCC 10.2.1, which is a bit pickier. * configure.ac: Do not use -Wsystem-headers, as this runs afoul of netdb.h on Fedora 33. * gnulib.modules: Add ‘attribute’. * lib/wordsplit.c (wsnode_new): Return the newly allocated pointer instead of a boolean, to pacify GCC 10.2.1 which otherwise complains about use of possibly-null pointers. All uses changed. * src/buffer.c (try_new_volume): Don’t assume find_next_block succeeds. (_write_volume_label): Pacify GCC 10.2.1 with an ‘assume’, since LABEL must be nonnull here. * src/common.h (FALLTHROUGH): Remove; now in attribute.h. Include attribute.h, for ATTRIBUTE_NONNULL. * src/misc.c (assign_string_or_null): New function, taking over the old role of assign_string. (assign_string): Assume VALUE is non-null. (assign_null): New function, taking over the old role of assign_string when its VALUE was nonnull. All callers of assign_string changed to use these functions. (assign_string_n): Clear *STRING if VALUE is null, to fix a potential double-free.