On Mon, 25 Aug 2025, Alexander Monakov wrote: > Most likely you are hitting Static Initialization Order Fiasco: > https://en.cppreference.com/w/cpp/language/siof.html > > class color actually has a constructor which will be used for constructing > the 'default_color' global object: > > color(symbol s = default_symbol) : scheme(DEFAULT), nm(s) {} > > This will copy the uninitialized contents of default_symbol, if its constructor > has not completed by that time. > > Since libgroff is a static library, the order in which constructors run without > LTO depends on the order in which linker extracts the object files from > libgroff.a static archive when linking. If the dependencies are such that > symbol.o is consistently pulled in prior to color.o, the constructor for > default_symbol would always run first. Oh, sorry, looks like it's worse: you were relying on the fiasco to get default_color.nm initialized to all-zeroes instead of default_symbol? Alexander
