union type is evil, redux

also, here's the text from configure.usage that i just wrote: --use-union-type Enable or disable use of a union, instead of an int, for the fundamental Lisp_Object type; this provides stricter type-checking. WARNING: This has a tendency to trigger compiler bugs, especially in combination with other features that increase the complexity of expressions, for example `--with-mule' and `--error-checking=all'. Crashes have been observed with union type in combination with the two options just mentioned under various versions of GCC as well as MSVC++ 6.0. Furthermore, many debuggers have problems (i.e. bugs) dealing with unions, and even for those that don't, debugging can be inconvenient because of no syntax for entering a union. We recommend `--use-union-type' *ONLY* for testing purposes, not for production builds. If you are using `-use-union-type' and get some weird crash, try redoing without union type. ----- Original Message ----- From: "Adam Duck" <duck(a)informatik.uni-frankfurt.de&gt; To: "Ben Wing" <ben(a)666.com&gt; Cc: <xemacs-beta(a)xemacs.org&gt; Sent: Monday, December 16, 2002 8:32 AM Subject: Re: crash while using calc