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| Subject: | Re: Help debugging a dll issue |
| References: | <b21c0ab1-341b-d6f5-915b-f73973b8079b AT cs DOT umass DOT edu> <830e7bcd-aeb5-264e-6436-799dfa54d7a0 AT cs DOT umass DOT edu> <nhr30c$qm5$1 AT ger DOT gmane DOT org> |
| To: | cygwin AT cygwin DOT com |
| From: | Eliot Moss <moss AT cs DOT umass DOT edu> |
| Message-ID: | <d704ffd1-f76c-1a75-e487-d6f15bbe6ece@cs.umass.edu> |
| Date: | Sat, 21 May 2016 22:52:42 -0400 |
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On 5/21/2016 9:45 PM, René Berber wrote: > On 5/21/2016 6:30 PM, Eliot Moss wrote: > > [snip] >> I used binary search, eliminating .o files from the .dll on the thought >> that it was either a particular .o file that was leading to a problem, >> or possibly the overall size (this is a huge link!). I found that a .dll >> with 58725 section 1 symbols (as reported by objdump -t) works, and one >> with 66675 section one symbols fails. So it appears to be a size issue. > > That's telling, since USHRT_MAX (65535) may be the limit, then somewhere > there is the use of a variable of that type (unsigned short int, > uint16_t), which may be part of some specification (i.e. the format of > libraries). > > Supporting that is: https://ghc.haskell.org/trac/ghc/ticket/5292 which > mentions: > > "65536 symbols. This is the limit that Windows DLLs can handle (the > source of the limitation is that they use 16-bit integers to represent > "ordinals")" > > and also point to an interesting bug report (5 years old): > > https://sourceware.org/bugzilla/show_bug.cgi?id=12969 > > No answers, but at least an explanation. Why the maintainers did not fix this, I don't know -- would have saved me a week of effort tacking things down! The solution was to use __declspec(dllexport), sparingly, so that only a few symbols would be exported, and to drop --export-all-symbols. (How did that work before? Was the system a lot smaller?) Supposedly __attribute__((dllexport)) also works, though I did not try it -- using __declspec was more in line with code for Windows native C compilers. At least this thread may help someone in the future! Regards -- Eliot -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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