[gnutls-devel] GnuTLS | UB+ASAN: Fail tests if UB detected (!1136)

[Development of GNU's TLS library]

Tim Rühsen commented on a discussion on .gitlab-ci.yml: https://gitlab.com/gnutls/gnutls/merge_requests/1136#note_266554253

> +  - export UBSAN_OPTIONS=print_stacktrace=1:suppressions=$(pwd)/devel/ubsan.supp
> +  - export LSAN_OPTIONS=suppressions=$(pwd)/devel/lsan.supp
> +  - export CFLAGS="-std=c99 -O1 -g -Wno-cpp -Werror -fno-omit-frame-pointer -fsanitize=undefined,bool,alignment,null,enum,bounds-strict,address,leak,nonnull-attribute -fno-sanitize-recover=all -fsanitize-address-use-after-scope"
> +  - export CXXFLAGS="$CFLAGS"
> +  - dash ./configure --cache-file cache/config.cache --disable-guile --disable-doc --disable-hardware-acceleration
> +  - sed -i 's/-Werror/-Wno-parentheses -Werror/g' src/Makefile
>    - make -j$(nproc)
> -  - make check -j$(nproc)
> -  - CFLAGS="-std=c99 -fsanitize=undefined -fsanitize=bool -fsanitize=alignment -fsanitize=null -fsanitize=bounds-strict -fsanitize=enum -fno-sanitize-recover -g -O2" CXXFLAGS=$CFLAGS LDFLAGS="-static-libubsan" dash ./configure
> -   --cache-file cache/config.cache --disable-non-suiteb-curves --disable-guile --disable-doc --disable-full-test-suite --with-default-trust-store-pkcs11="pkcs11:"
> +  - sed -i 's/-Werror//g' fuzz/Makefile tests/Makefile tests/slow/Makefile
> +  - make check -j$(nproc) -C fuzz
> +  - make check -j$(nproc) -C tests
> +  - dash ./configure --cache-file cache/config.cache --disable-guile --disable-doc --disable-hardware-acceleration --with-default-trust-store-pkcs11="pkcs11:"
>    - make clean
> +  - sed -i 's/-Werror/-Wno-parentheses -Werror/g' src/Makefile

Because of several autogen issues like this:
```
cli-debug-args.c:345:41: error: suggest parentheses around arithmetic in operand of '|' [-Werror=parentheses]
  345 | # define OPTPROC_BASE OPTPROC_TRANSLATE | OPTPROC_NXLAT_OPT
      |                                         ^
```

IMO, a comment in `.gitlab-ci.yml` is not needed since we all see these warning every time we compile.

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