Re: [PATCH] libsupc++: try cxa_thread_atexit_impl at runtime

[Alexandre Oliva <oliva@adacore.com>]

Hello, David,

On Dec  5, 2023, David Edelsohn <dje.gcc@gmail.com> wrote:

> This patch broke bootstrap on AIX.  The stage1 compiler is not able to
> build a program and stage2 configure fails.

Thanks for the report. sorry about the breakage.

If the patch makes any difference, this suggests that __GXX_WEAK__ is
defined on AIX, but that we can't rely on a weak undefined symbol for
this purpose.  Back to the drawing board...  I'm reverting this for now.

Maybe we should narrow it down to targets in which weak undefined
symbols are available with the expected semantics, and where the symbol
is known to have ever been defined in libc.  On it...

Or maybe a weak definition (or weak alias to a definition) in that file
would enable us to test whether the weak definition was preempted, and
use it if so.  Or even move the fallback definition into the weak
symbol.

Thanks again,

-- 
Alexandre Oliva, happy hacker            https://FSFLA.org/blogs/lxo/
   Free Software Activist                   GNU Toolchain Engineer
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