[Qemu-devel] [PATCH v3 07/28] build-sys: must link with -fstack-protector

[Alon Levy <alevy@redhat.com>]

From: Marc-André Lureau <marcandre.lureau@gmail.com>

It is needed to give that flag to the linker as well, but latest
libtool 2.4.2 still swallows that argument, so let's pass it with
libtool -Wc argument.

qemu-1.4.0/stubs/arch-query-cpu-def.c:6: undefined reference to `__stack_chk_guard'

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 configure | 8 +++++++-
 rules.mak | 1 +
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index ed49f91..dcc4767 100755
--- a/configure
+++ b/configure
@@ -1238,7 +1238,7 @@ fi
 gcc_flags="-Wold-style-declaration -Wold-style-definition -Wtype-limits"
 gcc_flags="-Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers $gcc_flags"
 gcc_flags="-Wmissing-include-dirs -Wempty-body -Wnested-externs $gcc_flags"
-gcc_flags="-fstack-protector-all -Wendif-labels $gcc_flags"
+gcc_flags="-Wendif-labels $gcc_flags"
 gcc_flags="-Wno-initializer-overrides $gcc_flags"
 # Note that we do not add -Werror to gcc_flags here, because that would
 # enable it for all configure tests. If a configure test failed due
@@ -1257,6 +1257,11 @@ for flag in $gcc_flags; do
     fi
 done
 
+if compile_prog "-Werror -fstack-protector-all" "" ; then
+    QEMU_CFLAGS="$QEMU_CFLAGS -fstack-protector-all"
+    LIBTOOLFLAGS="$LIBTOOLFLAGS -Wc,-fstack-protector-all"
+fi
+
 # Workaround for http://gcc.gnu.org/PR55489.  Happens with -fPIE/-fPIC and
 # large functions that use global variables.  The bug is in all releases of
 # GCC, but it became particularly acute in 4.6.x and 4.7.x.  It is fixed in
@@ -4068,6 +4073,7 @@ else
   echo "AUTOCONF_HOST := "                             >> $config_host_mak
 fi
 echo "LDFLAGS=$LDFLAGS" >> $config_host_mak
+echo "LIBTOOLFLAGS=$LIBTOOLFLAGS" >> $config_host_mak
 echo "LIBS+=$LIBS" >> $config_host_mak
 echo "LIBS_TOOLS+=$libs_tools" >> $config_host_mak
 echo "EXESUF=$EXESUF" >> $config_host_mak
diff --git a/rules.mak b/rules.mak
index edc2552..36aba2d 100644
--- a/rules.mak
+++ b/rules.mak
@@ -36,6 +36,7 @@ LINK = $(call quiet-command,\
        $(if $(filter %.lo %.la,$^),$(LIBTOOL) --mode=link --tag=CC \
        )$(CC) $(QEMU_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ \
        $(sort $(filter %.o, $1)) $(filter-out %.o, $1) $(version-obj-y) \
+       $(if $(filter %.lo %.la,$^),$(LIBTOOLFLAGS)) \
        $(LIBS),$(if $(filter %.lo %.la,$^),"lt LINK ", "  LINK  ")"$(TARGET_DIR)$@")
 endif
 
-- 
1.8.2