configure: bump min required CLang to 6.0 / XCode 10.0

Several distros have been dropped since the last time we bumped the
minimum required CLang version.

Per repology, currently shipping versions are:

             RHEL-8: 10.0.1
      Debian Buster: 7.0.1
 openSUSE Leap 15.2: 9.0.1
   Ubuntu LTS 18.04: 6.0.0
   Ubuntu LTS 20.04: 10.0.0
         FreeBSD 12: 8.0.1
          Fedora 33: 11.0.0
          Fedora 34: 11.1.0

With this list Ubuntu LTS 18.04 is the constraint at 6.0.0

An LLVM version of 6.0.0 corresponds to macOS XCode version of 10.0
which dates from Sept 2018.

Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

diff --git a/config.h b/config.h
index 2ef32c8627469ddaaf42400e03c4fab1a3508f75..cc887db222cc277be4be28d5fde52085884ebb46 100644 (file)
--- a/config.h
+++ b/config.h
@@ -36,12 +36,12 @@
 
 #if defined(__clang_major__) && defined(__clang_minor__)
 # ifdef __apple_build_version__
-#  if __clang_major__ < 5 || (__clang_major__ == 5 && __clang_minor__ < 1)
-#   error You need at least XCode Clang v5.1 to compile libvirt
+#  if __clang_major__ < 10 || (__clang_major__ == 10 && __clang_minor__ < 0)
+#   error You need at least XCode Clang v10.0 to compile libvirt
 #  endif
 # else
-#  if __clang_major__ < 3 || (__clang_major__ == 3 && __clang_minor__ < 4)
-#   error You need at least Clang v3.4 to compile libvirt
+#  if __clang_major__ < 6 || (__clang_major__ == 6 && __clang_minor__ < 4)
+#   error You need at least Clang v6.0 to compile libvirt
 #  endif
 # endif
 #elif defined(__GNUC__) && defined(__GNUC_MINOR__)
@@ -49,5 +49,5 @@
 #  error You need at least GCC v7.4.0 to compile libvirt
 # endif
 #else
-# error You either need at least GCC 7.4.0 or Clang 3.4 or XCode Clang 5.1 to compile libvirt
+# error You either need at least GCC 7.4.0 or Clang 6.0 or XCode Clang 10.0 to compile libvirt
 #endif