[distcc] Re: Distcc 2.7 fails to compile on OSX

[Matt Watson]

> Perhaps just a little check for whether variadic macros actually work 
> would be enough.  If they don't, then fall back to the non-gcc 
> implementation.

2.7.1's configure tries to check for this, but cpp-precomp passes the 
test, unfortunately :-(

Here's a more complete test which fails when run against the Apple 
cpp-precomp (but succeeds with -no-cpp-precomp):

dnl
dnl Test if the preprocessor understand vararg macros
dnl
AC_MSG_CHECKING([for vararg macro support])
AC_TRY_COMPILE([#define func(a, b...) do { } while (0)],
[func("a"); func("a", "b"); func("a", "b", "c")],
[AC_MSG_RESULT(yes)
  AC_DEFINE(HAVE_VARARG_MACROS, , [Define if your cpp has vararg 
macros])],
[AC_MSG_RESULT(no)])

matt.