Non SSL build with GSSAPI is broken

[andrewkirillov-ibm]

I did this

Did a non SSL build of 8.13.0 on IBMi V7R4M0 system and got it broken:

CZM1003:  http_negotiate.c, 113.49: CZM0045(30) Undeclared identifier SSL_CB_MAX_SIZE.
CZS0601:  Module HNEGOTIATE is not created because statement errors occurred.

Non SSL build worked fine however on Windows/Linux.

The issue seem to be introduced here:
646b2d6#diff-9940151c5408b92900d62ecbd521d5cee6eee0600a6d1297c72a0a26f322a4f0

Before the code was protected by

#if defined(USE_SSL) && defined(HAVE_GSSAPI)

But now the code references SSL_CB_MAX_SIZE (which is only defined for SSL builds) already under HAVE_GSSAPI check.

#ifdef HAVE_GSSAPI
  Curl_dyn_init(&neg_ctx->channel_binding_data, SSL_CB_MAX_SIZE + 1);
#ifdef USE_SSL
  ...

I expected the following

A clean build

curl/libcurl version

8.13.0

operating system

OS400 V7R4M0
(anything with GSSAPI)

[andrewkirillov-ibm]

To fix the issue the original #if defined(USE_SSL) && defined(HAVE_GSSAPI) could be restored. However, there might be a reason why it was undone in the first place.

Alternative solution can be Curl_dyn_init(&neg_ctx->channel_binding_data, 1); for non SSL builds. It did work for me.