Re: [Xen-devel] [xen-4.0-testing test] 7147: regressions - FAIL

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

I wrote:
> At top level:
> cc1: error: unrecognized command line option "-Wno-unused-but-set-variable"

How about this fix.

Ian.

diff -r 0f670f5146c8 Config.mk
--- a/Config.mk Sat May 21 07:55:46 2011 +0100
+++ b/Config.mk Mon May 23 16:07:59 2011 +0100
@@ -72,8 +72,7 @@ PYTHON_PREFIX_ARG ?= --prefix="$(PREFIX)
 
 # cc-option: Check if compiler supports first option, else fall back to second.
 # Usage: cflags-y += $(call cc-option,$(CC),-march=winchip-c6,-march=i586)
-cc-option = $(shell if test -z "`$(1) $(2) -S -o /dev/null -xc \
-              /dev/null 2>&1`"; then echo "$(2)"; else echo "$(3)"; fi ;)
+cc-option = $(shell $(XEN_ROOT)/config/test-cc-option.sh $(1) $(2) $(3))
 
 # cc-option-add: Add an option to compilation flags, but only if supported.
 # Usage: $(call cc-option-add CFLAGS,CC,-march=winchip-c6)
diff -r 0f670f5146c8 config/test-cc-option.sh
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/config/test-cc-option.sh  Mon May 23 16:07:59 2011 +0100
@@ -0,0 +1,31 @@
+#!/bin/sh
+set -e
+
+cc="$1"
+opt="$2"
+alt="$3"
+
+case "$opt" in
+-Wno-*)
+   # Sadly a broken implementation of the fix to GCC PR 28322
+   # (actually shipped eg in Debian lenny) makes it hard to spot
+   # whether the compiler recognises a -Wno-foo option without
+   # generating a warning for some other reason.
+
+   input="${0%-cc-option.sh}-cc-warning.c"
+   if $cc $opt -Wreturn-type -Wno-error -S -o /dev/null "$input" \
+           >/dev/null 2>&1; then
+       res="$opt"
+   else
+       res="$alt"
+   fi
+   ;;
+*)
+    if test -z "`$cc $opt $nerr -S -o /dev/null -xc $input 2>&1`"; then
+        res="$opt"
+    else
+        res="$alt"
+    fi
+    ;;
+esac
+printf "%s\n" "$res"
diff -r 0f670f5146c8 config/test-cc-warning.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/config/test-cc-warning.c  Mon May 23 16:07:59 2011 +0100
@@ -0,0 +1,2 @@
+extern int bogus(void);
+int bogus(void) { }

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel