[gnutls-devel] GnuTLS | tls13/prf fails with hardening LDFLAGS (#584)

[Development of GNU's TLS library]

New Issue was created.

Issue 584: https://gitlab.com/gnutls/gnutls/issues/584
Author:    Dimitri John Ledkov
Assignee:  

## Description of problem:

./tls13/prf fails with hardened LDFLAGS

I'm not sure if the testcase, or library, or both get miss-build. And ideally, things would build and test suite correctly (or like strip/warn against incompatible LDFLAGS).

## Version of gnutls used:
git master, 3.6.4

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

## How reproducible:

`
./configure LDFLAGS='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now'
make -j8
make -C tests tls13/prf
$ ./tests/tls13/prf
`

## Actual results:

`
$ ./tests/tls13/prf 
gnutls_prf: output doesn't match for 'key expansion'
got \x86\xdb\x26\xde\x6a\x57\x04\x5e\xa1\xc0\x13\x8c\x88\x85\xc4\xb0\xf9\x44\x38\x71\x4d\x34\xa4\x14\x21\x89\xb2\xda\x78\xc3\x6f\xd9\x79\xd5
expected \xfb\xcb\x96\x87\x8c\x64\x8b\x60\xef\xdc\x76\xb0\x7c\x3b\xd1\x50\x1e\xb1\x3f\x39\xb2\x20\x74\x2c\xb2\x76\x12\x9f\xfc\xad\xb9\xce\x1d\x9a
_check_wait_status:157: Child died with status 1
`

## Expected results:

`
# no output, exit code 0
`

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