Build: Require Automake 1.12 and use serial-tests option.

It should actually still work with Automake 1.10 if
the serial-tests option is removed. Automake 1.13 started
using parallel tests by default and the option to get
the old behavior isn't supported before 1.12.

At least for now, parallel tests don't improve anything
in XZ Utils but they hide the progress output from
test_compress.sh.

diff --git a/configure.ac b/configure.ac
index d80ec6fe525ddd69f9e4a2dc9b0b0cfc895a5d65..305c858dd6dce0af9b82bc71292c89c57f1c8650 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -416,7 +416,9 @@ fi
 echo
 echo "Initializing Automake:"
 
-AM_INIT_AUTOMAKE([1.10 foreign tar-v7 filename-length-max=99])
+# Automake 1.10 should still be enough but you need to omit serial-tests.
+dnl AM_INIT_AUTOMAKE([1.10 foreign tar-v7 filename-length-max=99])
+AM_INIT_AUTOMAKE([1.12 foreign tar-v7 filename-length-max=99 serial-tests])
 AC_PROG_LN_S
 
 AC_PROG_CC_C99