Around 18 o'clock on Feb 20, Egbert Eich wrote:
> However this doesn't work too well in freetype. jmp_bufs are
> part of larger structs. Converting this not totally trivial.
I think it's more practical to simply make the jmp_buf "big enough";
forcing the library to restructure itself to permit dynamic allocation of
jmp_buf will probably introduce more bugs that we won't easily detect.
Because the libc wrapper module is compiled with knowledge about the local
library, we can easily put in a compile-time check to make sure the
xf86jmp_buf is large enough for the native setjmp/longjmp implementation
on each host that runs XFree86:
char check_jmpbuf[sizeof(xf86jmp_buf) - sizeof(jmp_buf)];
This code will fail to compile if xf86jmp_buf is smaller than jmp_buf.
Stick this in a separate file so it doesn't get linked into the server
image and XFree86 won't build on a machine that needs more jmp_buf space.
Fixing this would require redefining the jmp_buf size and rebuilding all
of the modules that use setjmp making that machine incompatible with
binaries built for other machines with the same CPU.
-keith
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