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undefined-behavior obstack.c:139

From: Alexey Palienko
Subject: undefined-behavior obstack.c:139
Date: Wed, 22 Feb 2023 09:04:05 +0000

First of all, I would like to thank you for your contribution to the open source!

I found  some problem with m4 1.4.18. It has been built by clang 13 with "-g -fsanitize=address,undefined -fno-omit-frame-pointer -fsanitize-address-use-after-scope -fno-sanitize-recover=all"
And we have an error:

# /home/docker/.conan/data/m4/latest/_/_/package/3421fde5744f1eadef515027cbcbb9a8fbcd667c/bin/m4

obstack.c:139:35: runtime error: applying non-zero offset 107820858999056 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior obstack.c:139:35 in

I think, it is so and for 1.4.19

Best regards,
Alexey Palienko

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