On Monday 23 February 2009 04:26:11 Peter Johansson wrote: > aaragon wrote: > > aaragon@aaragon-laptop:~/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. _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
