Re: Compilation error with net-snmp header files

> OS: FreeBSD-4.10-RELEASE
>     (with /usr/local/include/getopt.h header file added by some packages)
> Net-SNMP: 5.2.1.2
> Compiler: gcc-3.4.2
> 
> If I try to compile the following sample program:
> 
> #include <net-snmp/net-snmp-config.h>
> #include <net-snmp/net-snmp-includes.h>
> #include <net-snmp/agent/net-snmp-agent-includes.h>
> 
> #include <unistd.h>
> 
> int
> main()
> {
>     exit(0);
> }
> 
> with the following arguments:
> g++34 `~/net-snmp/bin/net-snmp-config --cflags` bar.cc
> 
> it fails with the following errors:
> 
> pavlin@possum[483] g++34 `~/net-snmp/bin/net-snmp-config --cflags` bar.cc
> In file included from bar.cc:5:
> /usr/include/unistd.h:112: error: declaration of C function `int
> getopt(int, char* const*, const char*)' conflicts with
> /usr/local/include/getopt.h:115: error: previous declaration `int
> getopt()' here
> /home/possum/u0/pavlin/net-snmp/include/net-snmp/agent/agent_handler.h:238:
> warning: inline function `void*
> netsnmp_request_get_list_data(netsnmp_request_info*, const char*)'
> used but never defined
> Exit 1
> 
> The problem is that on FreeBSD getopt() may be declared in both
> <unistd.h> and /usr/local/include/getopt.h, and we shouldn't include
> both files. The latter is included by <net-snmp/utilities.h> if
> HAVE_GETOPT_H is defined.
> 
> Also note the second (probably independent) error about
> netsnmp_request_get_list_data() being used but never defined.
> 
> Both errors are with gcc-3.4 (and probably the gcc-4.x branch), but
> are not with the gcc-2.95.4 compiler.

After some investigation I found that the second error can be
eliminated if the inlined functions are disabled by adding
-DNETSNMP_NO_INLINE to the compiler's flags.

Any suggestions how to fix the first error?
The ugly hack I use for testing purpose is to add
"#undef HAVE_GETOPT_H" after "#include <net-snmp/net-snmp-config.h>"
but this is not an acceptable solution.

Pavlin


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