From cdcc9df182727b744b1baf686685a2ac41d0f36d Mon Sep 17 00:00:00 2001
From: Steve Holme <steve_holme@hotmail.com>
Date: Sat, 29 Feb 2020 21:44:10 +0000
Subject: configure.ac: Disable metalink support if an incompatible SSL/TLS
 specified

tool_metalink only supports cryptography from OpenSSL, GnuTLS, NSS,
The Win32 Crypto library and Apple's Common Crypto library.

If an TLS backend such as mbedTLS or WolfSSL is specified then the
following error is given during compilation along, with a load of
unresolved extern errors:

Can't compile METALINK support without a crypto library.

Reviewed-by: Daniel Stenberg
Closes #5006
---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure.ac b/configure.ac
index bde7d8853..6feab9284 100755
--- a/configure.ac
+++ b/configure.ac
@@ -2770,6 +2770,12 @@ if test X"$OPT_LIBMETALINK" != Xno; then
       AC_MSG_NOTICE([libmetalink library defective or too old])
       want_metalink="no"
     ])
+    if test "x$OPENSSL_ENABLED" != "x1" -a "x$USE_WINDOWS_SSPI" != "x1" \
+        -a "x$GNUTLS_ENABLED" != "x1" -a "x$MBEDTLS_ENABLED" != "x1" \
+        -a "x$NSS_ENABLED" != "x1" -a "x$SECURETRANSPORT_ENABLED" != "x1"; then
+      AC_MSG_WARN([metalink support requires a compatible SSL/TLS backend])
+      want_metalink="no"
+    fi
     CPPFLAGS="$clean_CPPFLAGS"
     LDFLAGS="$clean_LDFLAGS"
     LIBS="$clean_LIBS"
-- 
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