[patch] libgo - fix build errors and add ARM bits

[Matthias Klose]

libgo-fix-arm.diff: Work around parse error of struct timex_ on ARM (both trunk
and 4.7 branch).

libgo-hardening.diff: Avoid compiler warnings in libgo with -D_FORTIFY_SOURCE=2,
which let the build fail with -Werror. first chunk for the trunk and 4.7, second
chunk for trunk only.

libgo-mksysinfo.diff: Fix TIOCNOTTY and TIOCSCTTY definitions, afaicr needed for
ARM as well. for trunk and 4.7.

I did sign the contributors agreement at
http://golang.org/doc/contribute.html#copyright, however I didn't get any
feedback or acknowledgement yet.

  Matthias

# DP: libgo: Work around parse error of struct timex_ on ARM

Index: b/src/libgo/mksysinfo.sh
===================================================================
--- a/src/libgo/mksysinfo.sh
+++ b/src/libgo/mksysinfo.sh
@@ -173,6 +173,9 @@
 
 ${CC} -fdump-go-spec=gen-sysinfo.go -std=gnu99 -S -o sysinfo.s sysinfo.c
 
+# ARM
+sed -i '/type _timex/s/INVALID-bit-field/int32/g;/type _timex/s,^// ,,' gen-sysinfo.go
+
 echo 'package syscall' > ${OUT}
 echo 'import "unsafe"' >> ${OUT}
 echo 'type _ unsafe.Pointer' >> ${OUT}

# DP: Avoid compiler warnings in libgo with -D_FORTIFY_SOURCE=2

Index: b/src/libgo/runtime/print.c
===================================================================
--- a/src/libgo/runtime/print.c
+++ b/src/libgo/runtime/print.c
@@ -18,7 +18,7 @@
 	G* g = runtime_g();
 
 	if(g == nil || g->writebuf == nil) {
-		runtime_write(2, v, n);
+		ssize_t rv __attribute((unused)) = runtime_write(2, v, n);
 		return;
 	}
 
# DP: Fix build failure in libgo with -Werror -D_FORTIFY_SOURCE=2

--- a/src/libgo/runtime/go-signal.c
+++ b/src/libgo/runtime/go-signal.c
@@ -144,10 +144,12 @@
 static void
 runtime_badsignal(int32 sig)
 {
+	ssize_t rv __attribute__((unused));
+
 	if (sig == SIGPROF) {
 		return;  // Ignore SIGPROFs intended for a non-Go thread.
 	}
-	runtime_write(2, badsignal, sizeof badsignal - 1);
+	rv = runtime_write(2, badsignal, sizeof badsignal - 1);
 	runtime_exit(1);
 }
 

# DP: libgo: Fix TIOCNOTTY and TIOCSCTTY definitions

Index: b/src/libgo/mksysinfo.sh
===================================================================
--- a/src/libgo/mksysinfo.sh
+++ b/src/libgo/mksysinfo.sh
@@ -168,6 +168,12 @@
 #ifdef TIOCGWINSZ
   TIOCGWINSZ_val = TIOCGWINSZ,
 #endif
+#ifdef TIOCNOTTY
+  TIOCNOTTY_val = TIOCNOTTY,
+#endif
+#ifdef TIOCSCTTY
+  TIOCSCTTY_val = TIOCSCTTY,
+#endif
 };
 EOF
 
@@ -728,6 +734,16 @@
     echo 'const TIOCGWINSZ = _TIOCGWINSZ_val' >> ${OUT}
   fi
 fi
+if ! grep '^const TIOCNOTTY' ${OUT} >/dev/null 2>&1; then
+  if grep '^const _TIOCNOTTY_val' ${OUT} >/dev/null 2>&1; then
+    echo 'const TIOCNOTTY = _TIOCNOTTY_val' >> ${OUT}
+  fi
+fi
+if ! grep '^const TIOCSCTTY' ${OUT} >/dev/null 2>&1; then
+  if grep '^const _TIOCSCTTY_val' ${OUT} >/dev/null 2>&1; then
+    echo 'const TIOCSCTTY = _TIOCSCTTY_val' >> ${OUT}
+  fi
+fi
 
 # The ioctl flags for terminal control
 grep '^const _TC[GS]ET' gen-sysinfo.go | \