Re: [PATCH] Skip the test when Autoconf is too old for ObjC++

[Stefano Lattarini]

Hi Peter.  Since the test 't/objcxx-basic.sh' was indeed failing with
autoconf 2.62, I've folded in the following diff, inspired by your patch:

  diff --git a/t/objcxx-basic.sh b/t/objcxx-basic.sh
  index 50e1399..04a42a4 100755
  --- a/t/objcxx-basic.sh
  +++ b/t/objcxx-basic.sh
  @@ -26,10 +26,21 @@ AUTOMAKE_fails
   grep 'OBJCXX.* undefined' stderr
   grep 'add .*AC_PROG_OBJCXX' stderr

  -echo AC_PROG_OBJCXX >> configure.ac
  -$ACLOCAL --force
  -$AUTOMAKE
  +cat >> configure.ac <<'END'
  +dnl Support for Object C++ was introduced only in Autoconf 2.65.
  +AC_PREREQ([2.65])
  +AC_PROG_OBJCXX
  +END

  +if $ACLOCAL --force; then
  +  : We have a modern enough autocon, go ahead
  +elif test $? -eq 63; then
  +  skip_ "Object C++ support requires Autoconf 2.65 or later"
  +else
  +  Exit 1 # Some other aclocal failure.
  +fi
  +
  +$AUTOMAKE
   $EGREP '^\.SUFFIXES:.* \.mm( |$)' Makefile.in

 :

The test now works with Autoconf 2.65 and 2.69, and is correctly skipped
with Autoconf 2.64 and 2.62.

Regards,
  Stefano