Re: Compiler warning on Debian 12, PostgreSQL 16 Beta3 - Mailing list pgsql-hackers

On Wed, Nov 8, 2023 at 4:46 AM Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
> On 2023-Aug-25, Daniel Westermann (DWE) wrote:
> > I've just noticed this warning when building on Debian 12:
> >
> > In file included from /usr/lib/llvm-14/include/llvm/Analysis/ModuleSummaryAnalysis.h:17,
> >                  from llvmjit_inline.cpp:51:
> > /usr/lib/llvm-14/include/llvm/IR/ModuleSummaryIndex.h: In constructor
‘llvm::ModuleSummaryIndex::ModuleSummaryIndex(bool,bool)’: 
> > /usr/lib/llvm-14/include/llvm/IR/ModuleSummaryIndex.h:1175:73: warning: member ‘llvm::ModuleSummaryIndex::Alloc’ is
useduninitialized [-Wuninitialized] 
> >  1175 |       : HaveGVs(HaveGVs), EnableSplitLTOUnit(EnableSplitLTOUnit), Saver(Alloc),
> >       |
>
> Yeah, I get this one too.  I thought commit 37d5babb5cfa ("jit: Support
> opaque pointers in LLVM 16.") was going to silence it, but I was quite
> mistaken.  I gave that code a quick look and could not understand what
> it was complaining about.  Is it a bug in the LLVM headers?

I found the commit where they fixed that in 15+:

https://github.com/llvm/llvm-project/commit/1d9086bf054c2e734940620d02d4451156b424e6

They don't seem to back-patch fixes, generally.