Re: [RFC][PATCH] libtraceevent: Fix static library to hide hidden functions

On Tue, 19 Aug 2025 15:04:32 +0100
Metin Kaya <[email protected]> wrote:

> Now this is what I get when I try to build trace-cmd:
> 
>    BUILD                  trace-cmd
> /usr/bin/ld: /out/lib64/libtraceevent.a(libtraceevent.o): in function 
> `load_plugin':
> /libtraceevent/src/event-plugin.c:459:(.text+0x1458c): warning: Using 
> 'dlopen' in statically linked applications requires at runtime the 
> shared libraries from the glibc version used for linking
> /usr/bin/ld: /trace-cmd/tracecmd/trace-setup-guest.o: in function 
> `trace_setup_guest':
> trace-setup-guest.c:(.text+0x5c8): warning: Using 'getgrnam' in 
> statically linked applications requires at runtime the shared libraries 
> from the glibc version used for linking
> /usr/bin/ld: /trace-cmd/tracecmd/trace-record.o: in function 
> `record_trace.isra.0':
> trace-record.c:(.text+0xe705): warning: Using 'initgroups' in statically 
> linked applications requires at runtime the shared libraries from the 
> glibc version used for linking
> /usr/bin/ld: /trace-cmd/tracecmd/trace-record.o: in function 
> `do_getaddrinfo':
> trace-record.c:(.text+0x865): warning: Using 'getaddrinfo' in statically 
> linked applications requires at runtime the shared libraries from the 
> glibc version used for linking
> /usr/bin/ld: /trace-cmd/tracecmd/trace-record.o: in function 
> `record_trace.isra.0':
> trace-record.c:(.text+0xe6ee): warning: Using 'getpwnam' in statically 
> linked applications requires at runtime the shared libraries from the 
> glibc version used for linking

Do you get the above warnings regardless?


> /usr/bin/ld: /trace-cmd/tracecmd/trace-record.o: in function 
> `tracecmd_stat_cpu_instance':
> trace-record.c:(.text+0x12ec): undefined reference to `trace_seq_printf'
> /usr/bin/ld: /trace-cmd/tracecmd/trace-record.o: in function `record_stats':
> trace-record.c:(.text+0x1419): undefined reference to `trace_seq_init'


> /usr/bin/ld: /trace-cmd/lib/trace-cmd/libtracecmd.a(trace-input.o): in 
> function `update_page_info':
> trace-input.c:(.text+0x15d7): undefined reference to 
> `kbuffer_load_subbuffer'
> /usr/bin/ld: trace-input.c:(.text+0x15df): undefined reference to 
> `kbuffer_subbuffer_size'

Oops, I forgot that trace_seq* and kbuffer_* are also supplied. I made
everything that didn't start with 'tep_*' "static". I could add kbuffer_*
and trace_seq_* to that list (the easy way out), or I can parse
`nm libtraceevent.so` and convert everything that's static in it to static
in the static library.

-- Steve