configure: Detect openssl sm3 support

Older openssl versions do not support sm3. The code has an option to
disable the sm3 hash but the lack of openssl support is not detected
automatically.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Link: https://lore.kernel.org/r/b97e20faa07e9e31c6eaf96683011aa24e80760c.1689681454.git.msuchanek@suse.de
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>

diff --git a/configure.ac b/configure.ac
index 82a853289a83f017278283e949cf645728c9ecae..e5bceeaa1722d6c42c008a2cef67d0eaa8e48530 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -123,6 +123,13 @@ AC_ARG_WITH([openssl],
 AS_IF([test "x$with_openssl" != "xno"], [
        PKG_CHECK_MODULES([libcrypto], [libcrypto >= 1.1.0], [LIBS="$LIBS $libcrypto_LIBS"])
        AC_DEFINE([ENABLE_OPENSSL], [1], [Enable openssl for modinfo.])
+       AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <openssl/ssl.h>
+               int nid = NID_sm3;]])], [
+               AC_MSG_NOTICE([openssl supports sm3])
+       ], [
+               AC_MSG_NOTICE([openssl sm3 support not detected])
+               CPPFLAGS="$CPPFLAGS -DOPENSSL_NO_SM3"
+       ])
 ], [
        AC_MSG_NOTICE([openssl support not requested])
 ])