vquic: add support for GnuTLS backend of ngtcp2

Currently, the TLS backend used by vquic/ngtcp2.c is selected at compile
time. Therefore OpenSSL support needs to be explicitly disabled.

Signed-off-by: Daiki Ueno <dueno@redhat.com>
Closes #5148

1 files changed, 41 insertions, 1 deletions

diff --git a/docs/HTTP3.md b/docs/HTTP3.md
index 55bdd0263..2769439d6 100644
--- a/docs/HTTP3.md
+++ b/docs/HTTP3.md
@@ -29,7 +29,7 @@ in the master branch using pull-requests, just like ordinary changes.
 
 # ngtcp2 version
 
-## Build
+## Build with OpenSSL
 
 Build (patched) OpenSSL
 
@@ -68,6 +68,46 @@ Build curl
      % LDFLAGS="-Wl,-rpath,<somewhere1>/lib" ./configure --with-ssl=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3> --enable-alt-svc
      % make
 
+## Build with GnuTLS
+
+Build (patched) GnuTLS
+
+     % git clone --depth 1 -b tmp-quic https://gitlab.com/gnutls/gnutls.git
+     % cd gnutls
+     % ./bootstrap
+     % ./configure --disable-doc --prefix=<somewhere1>
+     % make
+     % make install
+
+Build nghttp3
+
+     % cd ..
+     % git clone https://github.com/ngtcp2/nghttp3
+     % cd nghttp3
+     % autoreconf -i
+     % ./configure --prefix=<somewhere2> --enable-lib-only
+     % make
+     % make install
+
+Build ngtcp2
+
+     % cd ..
+     % git clone https://github.com/ngtcp2/ngtcp2
+     % cd ngtcp2
+     % autoreconf -i
+     % ./configure PKG_CONFIG_PATH=<somewhere1>/lib/pkgconfig:<somewhere2>/lib/pkgconfig LDFLAGS="-Wl,-rpath,<somewhere1>/lib" --prefix=<somewhere3>
+     % make
+     % make install
+
+Build curl
+
+     % cd ..
+     % git clone https://github.com/curl/curl
+     % cd curl
+     % ./buildconf
+     % ./configure --without-ssl --with-gnutls=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3> --enable-alt-svc
+     % make
+
 # quiche version
 
 ## build