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unresolved _alloca with libcrypto.a
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 unresolved _alloca with libcrypto.a - May 12, '06, 4:57:14 PM
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demyn
Posts: 34
Joined: Jun. 20, '05,
Status: offline
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Hi,
Our application is built with MSVC and we are static linking to libssl.a and libcrypto.a. This gives us an unresolved symbol error:
Linking...
libcrypto.a(err_prn.o) : error LNK2019: unresolved external symbol __alloca referenced in function _ERR_print_errors_cb
libcrypto.a(sha512.o) : error LNK2001: unresolved external symbol __alloca
libcrypto.a(bn_prime.o) : error LNK2001: unresolved external symbol __alloca
We can get the link to success by including libgcc.a, but that makes me uneasy since we are using Visual C++. The app is mixed-mode so we aren't able link dynamically.
Could libcrypto.a get rebuilt with the inline version of alloca? Other thoughts on the matter?
Thanks,
Demyn
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RE: unresolved _alloca with libcrypto.a - May 12, '06, 5:44:37 PM
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Rodney
Posts: 3714
Joined: Jul. 9, '02,
From: /Tools lab
Status: offline
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Actually that is the solution (linking to libgcc.a).
Mark looked into this a couple of years ago now. I believe he extracted out specifically what
is needed. The specific posting is:
http://www.interopsystems.com/tools/tm.aspx?m=7818&mpage=1&key=__allocaẊ
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RE: unresolved _alloca with libcrypto.a - May 15, '06, 4:24:07 PM
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demyn
Posts: 34
Joined: Jun. 20, '05,
Status: offline
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Sounds good ... thanks for the link.
Mostly, I was concerned about symbols in libgcc.a colliding with MSVC library symbols. I check our app's .map file and only __alloca and ___chkstk are pulled in from libgcc. libstd (MSVC) has __chkstk (one less underscore), so I suppose it's okay.
Thanks
Demyn
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