[gnutls-devel] GnuTLS | Solaris build requires -D_XOPEN_SOURCE=600 -std=gnu99 (#782)

[Development of GNU's TLS library]

New Issue was created.

Issue 782: https://gitlab.com/gnutls/gnutls/issues/782
Author:    Jeffrey Walton
Assignees: 

## Description of problem:

GnuTLS 3.6.8 fails to compile on Solaris i86pc.

## Version of gnutls used:

GnuTLS 3.6.8

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

GnuTLS from 3.6.8 source tarball. Fetched from https://www.gnupg.org/ftp/gcrypt/gnutls/v3.6/.

## How reproducible:

It is consistently reproducible.

Testing on Solaris 11.3 reveals `CFLAGS` needs `-D_XOPEN_SOURCE=600 -std=gnu99` to avoid some compile errors due to `alloca`. I believe it is due to the inclusion of Gnulib.

Don't allow `-D_XOPEN_SOURCE=600` to cross-pollinate into `CXXFLAGS`, like by way of `CPPFLAGS`. `-D_XOPEN_SOURCE=600` breaks some C++ features due to the way Solaris enforces standard versions.

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