gcrypt: require libgcrypt >= 1.6.0

And remove setup thread callbacks init since it's not supported anymore.

configure.ac

@@ -3966,22 +3966,23 @@ dnl libgcrypt
 dnl
 AC_ARG_ENABLE(libgcrypt,
   [  --disable-libgcrypt     gcrypt support (default enabled)])
+# require libgcrypt >= 1.6.0
 AS_IF([test "${enable_libgcrypt}" != "no"], [
-  AC_CHECK_DECL([GCRYCTL_SET_THREAD_CBS], [
-    libgcrypt-config --version >/dev/null || \
-        AC_MSG_ERROR([gcrypt.h present but libgcrypt-config could not be found])
-    AC_CHECK_LIB(gcrypt, gcry_control, [
-      have_libgcrypt="yes"
-      AC_DEFINE([HAVE_GCRYPT], 1, [Defined if having gcrypt])
-      GCRYPT_CFLAGS="`libgcrypt-config --cflags`"
-      GCRYPT_LIBS="`libgcrypt-config --libs`"
-    ], [
-      AC_MSG_ERROR([libgcrypt not found. Install libgcrypt or pass --disable-libgcrypt.])
-    ], [`libgcrypt-config --libs`])
+  AC_TRY_COMPILE([
+#include <gcrypt.h>
+#if GCRYPT_VERSION_NUMBER < 0x010600
+#error
+#endif],
+  [], [
+    have_libgcrypt="yes"
+    AC_DEFINE([HAVE_GCRYPT], 1, [Defined if having gcrypt])
+    GCRYPT_CFLAGS="`libgcrypt-config --cflags`"
+    GCRYPT_LIBS="`libgcrypt-config --libs`"
   ], [
-    AC_MSG_ERROR([libgcrypt version 1.1.94 or higher not found. Install libgcrypt or pass --disable-libgcrypt.])
-  ], [#include <gcrypt.h>]
-  )
+    AS_IF([test "${enable_libgcrypt}" == "yes"], [
+      AC_MSG_ERROR([libgcrypt version 1.6.0 or higher not found. Install libgcrypt or pass --disable-libgcrypt.])
+    ])
+  ])
 ])
 
 AC_SUBST(GCRYPT_CFLAGS)

include/vlc_gcrypt.h

@@ -25,65 +25,6 @@
 
 #include <errno.h>
 
-#ifdef LIBVLC_USE_PTHREAD
-/**
- * If possible, use gcrypt-provided thread implementation. This is so that
- * other non-VLC components (inside the process) can also use gcrypt safely.
- */
-GCRY_THREAD_OPTION_PTHREAD_IMPL;
-# define gcry_threads_vlc gcry_threads_pthread
-#else
-
-/**
- * gcrypt thread option VLC implementation
- */
-
-static int gcry_vlc_mutex_init( void **p_sys )
-{
-    vlc_mutex_t *p_lock = (vlc_mutex_t *)malloc( sizeof( vlc_mutex_t ) );
-    if( p_lock == NULL)
-        return ENOMEM;
-
-    vlc_mutex_init( p_lock );
-    *p_sys = p_lock;
-    return VLC_SUCCESS;
-}
-
-static int gcry_vlc_mutex_destroy( void **p_sys )
-{
-    vlc_mutex_t *p_lock = (vlc_mutex_t *)*p_sys;
-    vlc_mutex_destroy( p_lock );
-    free( p_lock );
-    return VLC_SUCCESS;
-}
-
-static int gcry_vlc_mutex_lock( void **p_sys )
-{
-    vlc_mutex_lock( (vlc_mutex_t *)*p_sys );
-    return VLC_SUCCESS;
-}
-
-static int gcry_vlc_mutex_unlock( void **lock )
-{
-    vlc_mutex_unlock( (vlc_mutex_t *)*lock );
-    return VLC_SUCCESS;
-}
-
-static const struct gcry_thread_cbs gcry_threads_vlc =
-{
-    GCRY_THREAD_OPTION_USER,
-    NULL,
-    gcry_vlc_mutex_init,
-    gcry_vlc_mutex_destroy,
-    gcry_vlc_mutex_lock,
-    gcry_vlc_mutex_unlock,
-    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
-};
-#endif
-
-/**
- * Initializes gcrypt with proper locking.
- */
 static inline void vlc_gcrypt_init (void)
 {
     /* This would need a process-wide static mutex with all libraries linking
@@ -96,7 +37,10 @@ static inline void vlc_gcrypt_init (void)
     vlc_global_lock (VLC_GCRYPT_MUTEX);
     if (!done)
     {
-        gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_vlc);
+        /* The suggested way for an application to make sure that global_init
+         * has been called is by using gcry_check_version. (see global_init
+         * comments in gcrypt sources) */
+        gcry_check_version(NULL);
         done = true;
     }
     vlc_global_unlock (VLC_GCRYPT_MUTEX);