cgcc: teach cgcc about Hurd/GNU

cgcc fails if it doesn't know about the system/OS as
returned by `uname -s`. This creates a build failure for
Debian since Hurd is one of their non-official 'ports'
but unknown to cgcc.

So, teach cgcc about 'GNU' (the OS/system name returned
on Hurd) and add the few predefines used to identify it.

Reported-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/cgcc b/cgcc
index a99a3a1c..629124b9 100755
--- a/cgcc
+++ b/cgcc
@@ -274,6 +274,9 @@ sub add_specs {
     } elsif ($spec eq 'darwin') {
 	return
 	    ' -D__APPLE__=1 -D__MACH__=1';
+    } elsif ($spec eq 'gnu') {		# Hurd
+	return &add_specs ('unix') .	# So, GNU is Unix, uh?
+	    ' -D__GNU__=1 -D__gnu_hurd__=1 -D__MACH__=1';
     } elsif ($spec eq 'unix') {
 	return ' -Dunix=1 -D__unix=1 -D__unix__=1';
     } elsif ( $spec =~ /^cygwin/) {