Hello,
On 2013-05-22 20:22 +0200, Dimitrios Apostolou wrote:
> The "getaddrinfo-link.c" attached file is a simplification of what
> AC_REPLACE_FUNCS(getaddrinfo) tries to compile and link. It fails to find
> the symbol because gcc most probably doesn't use proper calling
> conventions (stdcall). This is demonstrated by the build success of the
> second attached program. So:
[...]
> In the second case ("getaddrinfo-link-2.c") compilation is successful
> because the symbol linked is "_getaddrinfo@16" which actually exists in
> ws2_32 (verified it with nm).
[...]
> [getaddrinfo-link-2.c]
> int __attribute__((__stdcall__)) getaddrinfo(int,int,int,int);
[...]
The fundamental problem, I think, is that you really need the proper
headers included and AC_REPLACE_FUNCS does not seem to allow you to
specify the includes. So you probably can't use this macro at all.
You can use AC_LINK_IFELSE to fully specify the test program to compile
and link, which is probably what you'll need to do here. This may still
be tricky to get right. Alternately, Gnulib[1] has a getaddrinfo module[2]
which may already do everything you need (although I have not used it).
[1] https://gnu.org/s/gnulib
[2] http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob_plain;f=modules/getaddrinfo
Cheers,
--
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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