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bug#38748: 28.0.50; crash on MacOS 10.15.2

From: Pip Cet
Subject: bug#38748: 28.0.50; crash on MacOS 10.15.2
Date: Wed, 8 Jan 2020 22:18:11 +0000

On Wed, Jan 8, 2020 at 9:43 PM Robert Pluim <address@hidden> wrote:
> gcc --version
> Configured with: --prefix=/Library/Developer/CommandLineTools/usr 
> --with-gxx-include-dir=/usr/include/c++/4.2.1
> Apple LLVM version 10.0.1 (clang-1001.0.46.4)
> Target: x86_64-apple-darwin18.7.0
> Thread model: posix
> InstalledDir: /Library/Developer/CommandLineTools/usr/bin
> Iʼve attached the disassembly of the two versions. They're very very
> similar (this is with -g3 -O0).

But wait, doesn't the bug happen in both unoptimized versions? I
should have been clearer: my suspicion is the bug only goes away if
tail calls are optimized, which happens only with optimizations

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