Failing to link with libei.a in OTP build 24.2

[Serge Aleynikov]

Luke, this is related to this issue:
https://github.com/saleyn/erlexec/issues/155.
You can clone the erlexec project from https://github.com/saleyn/erlexec
and try to build it with:

DEBUG=true make


On Wed, Jan 12, 2022 at 10:15 AM Luke Bakken <luke@REDACTED> wrote:

> Hi Serge,
>
> I could try to reproduce (and maybe fix) this using my Arch
> environment if you'd like to provide source code I could compile.
>
> Thanks -
> Luke
>
> On Wed, Jan 12, 2022 at 5:56 AM Serge Aleynikov <serge@REDACTED>
> wrote:
> >
> > I am using Arch Linux and have the latest OTP 24.2 installed.  When
> trying to build a project that depends on libei.a I am getting undefined
> references of "ei_*" functions.  This doesn't happen when I download and
> build erlang OTP from sources.  Investigating this issue shows that the
> 24.2 Erlang/OTP package included in Arch distribution has libei.a built
> with LTO
> >
> > $ nm /usr/lib/erlang/lib/erl_interface-5.1/lib/libei.a | head -10
> > /usr/bin/nm: ei_connect.o: plugin needed to handle lto object
> >
> > ei_connect.o:
> > 0000000000000001 C __gnu_lto_slim
> >
> > ei_resolve.o:
> > 0000000000000001 C __gnu_lto_slim
> >
> > eirecv.o:
> > 0000000000000001 C __gnu_lto_slim
> >
> >
> > whereas the manually built one doesn't seem to use LTO:
> >
> > $ nm /opt/sw/erlang/24.2/lib/erlang/lib/erl_interface-5.1/lib/libei.a |
> head -10
> >
> > ei_connect.o:
> >                 U clock
> >                 U close
> >                 U __ctype_b_loc
> > 0000000000000140 t dyn_gethostbyname_r
> > 00000000000048f0 T ei_accept
> >                 U ei_accept_ctx_t__
> > 0000000000003560 T ei_accept_tmo
> > 0000000000003430 T ei_close_connection
> >
> >
> > What's the correct linking options when building projects using libei.a
> in OTP 24.2? Adding "-flto" flag doesn't seem to help:
>
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