Explcitly mention LibreSSL and BoringSSL in documentation

Fixes pycurl#530

INSTALL.rst

@@ -56,7 +56,8 @@ To fix this, you need to tell ``setup.py`` what SSL backend is used::
     python setup.py --with-[openssl|gnutls|nss|mbedtls] install
 
 Note: as of PycURL 7.21.5, setup.py accepts ``--with-openssl`` option to
-indicate that libcurl is built against OpenSSL. ``--with-ssl`` is an alias
+indicate that libcurl is built against OpenSSL/LibreSSL/BoringSSL.
+``--with-ssl`` is an alias
 for ``--with-openssl`` and continues to be accepted for backwards compatibility.
 
 You can also ask ``setup.py`` to obtain SSL backend information from installed
@@ -216,8 +217,8 @@ Additional Windows setup.py options:
   import library. The default is ``libcurl.lib`` which is appropriate for
   static linking and is sometimes the correct choice for dynamic linking as
   well. The other possibility for dynamic linking is ``libcurl_imp.lib``.
-- ``--with-openssl``: use OpenSSL crypto locks when libcurl was built against
-  OpenSSL.
+- ``--with-openssl``: use OpenSSL/LibreSSL/BoringSSL crypto locks when libcurl
+  was built against these SSL backends.
 - ``--with-ssl``: legacy alias for ``--with-openssl``.
 - ``--openssl-lib-name=""``: specify a different name for OpenSSL import
   library containing CRYPTO_num_locks. For OpenSSL 1.1.0+ this should be set

doc/thread-safety.rst

@@ -21,7 +21,8 @@ For Python programs using PycURL, this means:
   Python code *outside of a libcurl callback for the PycURL object in question*
   is unsafe.
 
-PycURL handles the necessary SSL locks for OpenSSL/LibreSSL, GnuTLS, NSS and mbedTLS.
+PycURL handles the necessary SSL locks for OpenSSL/LibreSSL/BoringSSL,
+GnuTLS, NSS and mbedTLS.
 
 A special situation exists when libcurl uses the standard C library
 name resolver (i.e., not threaded nor c-ares resolver). By default libcurl

setup.py

@@ -896,8 +896,8 @@ def gen_docstrings_sources():
 PycURL Unix options:
  --curl-config=/path/to/curl-config  use specified curl-config binary
  --libcurl-dll=[/path/to/]libcurl.so obtain SSL library from libcurl.so
- --openssl-dir=/path/to/openssl/dir  path to OpenSSL headers and libraries
- --with-openssl                      libcurl is linked against OpenSSL
+ --openssl-dir=/path/to/openssl/dir  path to OpenSSL/LibreSSL/BoringSSL headers and libraries
+ --with-openssl                      libcurl is linked against OpenSSL/LibreSSL/BoringSSL
  --with-ssl                          legacy alias for --with-openssl
  --with-gnutls                       libcurl is linked against GnuTLS
  --with-nss                          libcurl is linked against NSS
@@ -910,7 +910,7 @@ def gen_docstrings_sources():
  --use-libcurl-dll                     link against libcurl DLL, if not given
                                        link against libcurl statically
  --libcurl-lib-name=libcurl_imp.lib    override libcurl import library name
- --with-openssl                        libcurl is linked against OpenSSL
+ --with-openssl                        libcurl is linked against OpenSSL/LibreSSL/BoringSSL
  --with-ssl                            legacy alias for --with-openssl
  --link-arg=foo.lib                    also link against specified library
 '''