qemu-native: set ld.bfd, fix cflags, and set some environment vars

The main thing is build failures with gold linker, but qemu is also a
little too aggressive at finding random tools on the build host, so we
also set the build env for qemu-native and make sure it doesn't reset
its own (hard-coded) cflags when we don't want it to.

(From OE-Core rev: 862c9cbbef1f17b57c0ea369d88194b60623ffdd)

Signed-off-by: Stephen Arnold <sarnold@vctlabs.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/qemu/qemu.inc

@@ -30,8 +30,12 @@ SRC_URI_append_class-native = "\
 
 EXTRA_OECONF += "--target-list=${@get_qemu_target_list(d)} --disable-werror  --disable-bluez --disable-libiscsi --with-system-pixman --extra-cflags='${CFLAGS}'"
 
-EXTRA_OECONF_class-nativesdk = "--target-list=${@get_qemu_target_list(d)} --disable-werror \
-				"
+EXTRA_OECONF_class-nativesdk = "--target-list=${@get_qemu_target_list(d)} --disable-werror"
+
+EXTRA_OEMAKE_append_class-native = " LD='${LD}' AR='${AR}' OBJCOPY='${OBJCOPY}' LDFLAGS='${LDFLAGS}'"
+
+LDFLAGS_append_class-native = " -fuse-ld=bfd"
+
 export LIBTOOL="${HOST_SYS}-libtool"
 
 do_configure_prepend_class-native() {
@@ -40,6 +44,11 @@ do_configure_prepend_class-native() {
 	if [ ! -z "$BHOST_PKGCONFIG_PATH" ]; then
 		export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:$BHOST_PKGCONFIG_PATH
 	fi
+
+	# Alter target makefiles to accept CFLAGS set via env
+	sed -i -r \
+		-e 's/^(C|OP_C|HELPER_C)FLAGS=/\1FLAGS+=/' \
+		"${S}"/Makefile "${S}"/Makefile.target
 }
 
 KVMENABLE = "--enable-kvm"

meta/recipes-devtools/qemu/qemu/qemu-2.5.0-cflags.patch

@@ -0,0 +1,13 @@
+--- a/configure
++++ b/configure
+@@ -4468,10 +4468,6 @@ fi
+ if test "$gcov" = "yes" ; then
+   CFLAGS="-fprofile-arcs -ftest-coverage -g $CFLAGS"
+   LDFLAGS="-fprofile-arcs -ftest-coverage $LDFLAGS"
+-elif test "$fortify_source" = "yes" ; then
+-  CFLAGS="-O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 $CFLAGS"
+-elif test "$debug" = "no"; then
+-  CFLAGS="-O2 $CFLAGS"
+ fi
+ 
+ ##########################################

meta/recipes-devtools/qemu/qemu_2.6.0.bb

@@ -8,7 +8,9 @@ SRC_URI += "file://configure-fix-Darwin-target-detection.patch \
             file://Qemu-Arm-versatilepb-Add-memory-size-checking.patch \
             file://no-valgrind.patch \
             file://pathlimit.patch \
-           "
+            file://qemu-2.5.0-cflags.patch \
+"
+
 SRC_URI_prepend = "http://wiki.qemu-project.org/download/${BP}.tar.bz2"
 SRC_URI[md5sum] = "ca3f70b43f093e33e9e014f144067f13"
 SRC_URI[sha256sum] = "c9ac4a651b273233d21b8bec32e30507cb9cce7900841febc330956a1a8434ec"