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Re: library search test fails, please help
From: |
Keith Marshall |
Subject: |
Re: library search test fails, please help |
Date: |
Mon, 23 Feb 2009 16:23:01 +0000 |
User-agent: |
KMail/1.9.10 |
On Monday 23 February 2009 04:26:11 Peter Johansson wrote:
> aaragon wrote:
> > address@hidden:~/Lib/lib$ nm -g libcpputils.so | grep
> > flip | c++filt 00003c20 T cpputils::flip(double)
>
> Isn't the problem that flip(double) is in namespace cpputils?
Well yes, and no. The real problem is that AC_CHECK_LIB can only be
used effectively, when it is instructed to search for a symbol with
`extern "C"' linkage, (and in the case of platforms such as MS-Win32,
which make a distinction between functions with e.g. `_cdecl' and
`_stdcall' calling conventions, that restriction is further extended
to permit use only with `_cdecl' functions).
With C++ symbols, (and with `_stdcall' functions), the actual public
name of the symbol, as it appears in the library, is decorated, (or
mangled), in a fashion which can only be reproduced when a prototype
is in scope at compile time; AC_CHECK_LIB provides no mechanism to
specify any such prototype. (Ok, you *might* get away with it, if
you set the language to C++ *before* invoking AC_CHECK_LIB, and the
symbol you are checking on just happens to fortuitously match the
default prototype *assumed* by AC_CHECK_LIB, (which can *never*
happen in the case of MS-Win32's `_stdcall' functions)).
Perhaps this restriction needs to be more clearly explained, in the
autoconf manual?
--
Regards,
Keith.
- Re: library search test fails, please help, (continued)
- Re: library search test fails, please help, Peter O'Gorman, 2009/02/22
- Re: library search test fails, please help, aaragon, 2009/02/22
- Re: library search test fails, please help, Peter Johansson, 2009/02/22
- Message not available
- Re: library search test fails, please help, Peter Johansson, 2009/02/23
- RE: library search test fails, please help, John Calcote, 2009/02/23
- Re: library search test fails, please help, aaragon, 2009/02/23
- Re: library search test fails, please help, aaragon, 2009/02/23
- Re: library search test fails, please help,
Keith Marshall <=
- RE: library search test fails, please help, John Calcote, 2009/02/23
- RE: library search test fails, please help, aaragon, 2009/02/23
- RE: library search test fails, please help, Bob Friesenhahn, 2009/02/23
- RE: library search test fails, please help, John Calcote, 2009/02/23
Re: library search test fails, please help, Ralf Wildenhues, 2009/02/28