stdlib: fix re:replace on LTO builds

Fabio Coatti reported elixir build failure in https://bugs.gentoo.org/681778.
The minimal reproducer looks like that (from otp git tree):

    $ ./configure CFLAGS='-O2 -flto' LDFLAGS='-O2 -flto=8'
    $ make
    $ ERL_TOP=$PWD \
      PATH=$ERL_TOP/bin:$PATH \
        \
        bin/erl \
        \
        -noshell -eval 're:replace("a","b","c",[{return,list}]).' \
        -s erlang halt

    {"init terminating in do_boot",{badarg,[{re,replace,["a","b","c",[{return,list}]],
        [{file,"re.erl"},{line,362}]},
         {erl_eval,do_apply,6,[{file,"erl_eval.erl"},{line,680}]},
         {init,start_it,1,[]},
         {init,start_em,1,[]},
         {init,do_boot,3,[]}]}}
    init terminating in do_boot ({badarg,[{re,replace,[[_],[_],[_],[_]],[{_},{_}]},
        {erl_eval,do_apply,6,[{_},{_}]},{init,start_it,1,[]},{init,start_em,1,[]},{init,do_boot,3,[]}]})
    Crash dump is being written to: erl_crash.dump...done

The failure happens in libpcre2 where stack overflow is mis-identified
at function entry of

    erts_pcre_compile2()
        compile_regex()
          if (PUBL(stack_guard) != NULL && PUBL(stack_guard)())
          {
              *errorcodeptr= ERR85;
              return FALSE;
          }

The stack "overflow" detection happens in

    thr_wrapper()
        ethr_set_stacklimit__()

because the stack usage code relies on the fact that ethr_set_stacklimit__()
and similar functions don't get inlined into callers for stack growth
measurement.

Before the change inlining avoidance was achieved by putting functions
into standalone translation units. LTO makes this technique inefficient.

The change marks functions explicitly as __attribute__((__noinline__)) on gcc.

Reported-by: Fabio Coatti
Bug: https://bugs.gentoo.org/681778
Signed-off-by: Sergei Trofimovich <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/erts/include/internal/ethr_internal.h b/erts/include/internal/ethr_internal.h
index ac27ff2ed0..17ec84c52b 100644
--- a/erts/include/internal/ethr_internal.h
+++ b/erts/include/internal/ethr_internal.h
@@ -90,7 +90,7 @@ int ethr_init_common__(ethr_init_data *id);
 int ethr_late_init_common__(ethr_late_init_data *lid);
 void ethr_run_exit_handlers__(void);
 void ethr_ts_event_destructor__(void *vtsep);
-void ethr_set_stacklimit__(char *prev_c, size_t stacksize);
+void ethr_set_stacklimit__(char *prev_c, size_t stacksize) ETHR_NOINLINE;
 
 #if defined(ETHR_X86_RUNTIME_CONF__)
 void ethr_x86_cpuid__(int *eax, int *ebx, int *ecx, int *edx);