More NetBSD porting.

* Makefile (EXTRA_FLAGS): Handy new variable for additional
ad-hoc CFLAGS. Needed by a new test in configure.

* configure: Check for annoying warnings about char being used
as an array subscript when calling the macros from <ctype.h>.
If this occurs, suppress it by #undef-ing the macros.
(lang_flags): Switching fromm _XOPEN_SOURCE to _XOPEN_SOURCE=2
because this is needed on NetBSD to obtain declarations of
popen and pclose.

* stream.c (pipe_close): If we don't have the WIFCONTINUED macro,
then define it to expand to zero. It's absent on NetBSD and they
already seem to have a hack for this because there is a warning about
the function not being defined, but then the program links anyway.
Let's do it properly and not rely on their hack.

1 files changed, 3 insertions, 0 deletions

diff --git a/stream.c b/stream.c
index e877d200..0201c3eb 100644
--- a/stream.c
+++ b/stream.c
@@ -284,6 +284,9 @@ static val pipe_close(val stream, val throw_on_error)
                   lit("unable to obtain status of command ~a: ~a/~s"),
                   stream, num(errno), string_utf8(strerror(errno)), nao);
 #ifdef HAVE_SYS_WAIT
+#ifndef WIFCONTINUED
+#define WIFCONTINUED(X) 0
+#endif
       } else if (WIFEXITED(status)) {
         int exitstatus = WEXITSTATUS(status);
         uw_throwf(process_error_s, lit("pipe ~a terminated with status ~a"),