tree 643167839f12f39174a38c8096176fa837f173ce
parent e83bbc48abcc77c3128e304df6de27a4621ed3b7
author Peter Stuge <peter@stuge.se> 1477618910 +0200
committer Alexander Lamaison <alexander.lamaison@gmail.com> 1478947566 +0000

configure.ac: Add --with-crypto= instead of many different --with-$backend

The new --with-crypto option replaces the previous backend-specific
--with-{openssl,libgcrypt,mbedtls,wincng} options and fixes some issues.

* libgcrypt or mbedtls would previously be used whenever found, even
  if configure was passed --without-libgcrypt or --without-mbedtls.

* If --with-$backend was specified then configure would not fail even
  if that library could not be found, and would instead use whichever
  crypto library was found first.

The new option defaults to `auto`, which makes configure check for all
supported crypto libraries in turn, choosing the first one found, or
exiting with an error if none can be found.