[Qemu-devel] [PATCH 19/32] configure: Explicitly set ARFLAGS so we can build with GNU Make 4.0

[Michael Roth <mdroth@linux.vnet.ibm.com>]

From: Peter Maydell <peter.maydell@linaro.org>

Our rules.mak adds '-rR' to MAKEFLAGS to indicate that we will be
explicitly specifying everything and not relying on any default
variables or rules. However we were accidentally relying on the
default ARFLAGS ("rv"). This went unnoticed because of a bug in
GNU Make 3.82 and earlier which meant that adding -rR to MAKEFLAGS
only affected submakes, not the currently running instance.
Explicitly set ARFLAGS in config-host.mak, in the same way we
handle CFLAGS and LDFLAGS; this will allow us to work with
Make 4.0.

Thanks to Paul Smith for analyzing this bug for us.

Cc: qemu-stable@nongnu.org
Reported-by: Ken Moffat <zarniwhoop@ntlworld.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 45d285abd7028ac72418c1a22f9298bb898fbfb8)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 configure |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/configure b/configure
index 1399de2..ff7933b 100755
--- a/configure
+++ b/configure
@@ -298,6 +298,9 @@ query_pkg_config() {
 pkg_config=query_pkg_config
 sdl_config="${SDL_CONFIG-${cross_prefix}sdl-config}"
 
+# If the user hasn't specified ARFLAGS, default to 'rv', just as make does.
+ARFLAGS="${ARFLAGS-rv}"
+
 # default flags for all hosts
 QEMU_CFLAGS="-fno-strict-aliasing $QEMU_CFLAGS"
 QEMU_CFLAGS="-Wall -Wundef -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
@@ -3529,6 +3532,7 @@ echo "Source path       $source_path"
 echo "C compiler        $cc"
 echo "Host C compiler   $host_cc"
 echo "Objective-C compiler $objcc"
+echo "ARFLAGS           $ARFLAGS"
 echo "CFLAGS            $CFLAGS"
 echo "QEMU_CFLAGS       $QEMU_CFLAGS"
 echo "LDFLAGS           $LDFLAGS"
@@ -4117,6 +4121,7 @@ echo "CC_I386=$cc_i386" >> $config_host_mak
 echo "HOST_CC=$host_cc" >> $config_host_mak
 echo "OBJCC=$objcc" >> $config_host_mak
 echo "AR=$ar" >> $config_host_mak
+echo "ARFLAGS=$ARFLAGS" >> $config_host_mak
 echo "AS=$as" >> $config_host_mak
 echo "CPP=$cpp" >> $config_host_mak
 echo "OBJCOPY=$objcopy" >> $config_host_mak
-- 
1.7.9.5