[gnutls-devel] libtasn1 | fail to parse certificate then build with clang (#31)

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Sun Jan 10 02:53:21 CET 2021

rim created an issue: https://gitlab.com/gnutls/libtasn1/-/issues/31

## Description of problem:
Not sure that this is a libtasn1 error or clang.

I am update my desktop to current and claws-mail show me certs errors, I dig inside and found that gnutls_x509_crt_get_fingerprint() fails.
At next step I found that if I rebuild libtasn1 with debug then it fixes errors.

I wrote test app to reproduce error and check on other systems.
On my home server (12.2) gnutls+libtasn1 was already installed and no errors happen. But after I rebuild libtasn1 - test app show error.
Now I can not fix because even with -O0 it produces error.

clang version 11.0.1 (git at github.com:llvm/llvm-project.git llvmorg-11.0.1-rc2-0-g43ff75f2c3f)
even -O2 gives code that does not work.
-O1, -O0 - work.

clang version 10.0.1 (git at github.com:llvm/llvm-project.git llvmorg-10.0.1-0-gef32c611aa2)
12.2-STABLE 5586a4e13931(stable/12)
does not work with any -O values.

## Version of libtasn1 used:

## Distributor of libtasn1 (e.g., Ubuntu, Fedora, RHEL)

## How reproducible:
Build test tool:
cc gnutls_test.c -O0 -DDEBUG -I/usr/local/include -L/usr/local/lib -lm -lgnutls -o gnutls_test

Run test:
./gnutls_test ./pop.mail.ru.995.cert

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