[Qemu-devel] [PATCH] configure: Split valgrind test into pragma test and valgrind.h test

[Peter Maydell]

Split the configure test that checks for valgrind into two, one
part checking whether we have the gcc pragma to disable unused-but-set
variables, and the other part checking for the existence of valgrind.h.
The first of these has to be compiled with -Werror and the second
does not and shouldn't generate any warnings.

This (a) allows us to enable "make errors in configure tests be
build failures" and (b) enables use of valgrind on systems with
a gcc which doesn't know about -Wunused-but-set-varibale, like
Debian squeeze.

Signed-off-by: Peter Maydell <address@hidden>
---
This can be applied now and I think it ought to be sufficient
that we could then apply the 11-patch configure series I sent
earlier. If patch 1 in that series still causes trouble after
this, then I'd suggest committing patches 2-10, to save yet
more people sending patches to the list for those.

 configure            |   23 +++++++++++++++++++++--
 coroutine-ucontext.c |    4 ++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index c65b5f6..1d713de 100755
--- a/configure
+++ b/configure
@@ -2873,14 +2873,29 @@ if compile_prog "" "" ; then
 fi
 
 ########################################
+# check whether we can disable the -Wunused-but-set-variable
+# option with a pragma (this is needed to silence a warning in
+# some versions of the valgrind VALGRIND_STACK_DEREGISTER macro.)
+# This test has to be compiled with -Werror as otherwise an
+# unknown pragma is only a warning.
+pragma_disable_unused_but_set=no
+cat > $TMPC << EOF
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+int main(void) {
+    return 0;
+}
+EOF
+if compile_prog "-Werror" "" ; then
+    pragma_disable_unused_but_set=yes
+fi
+
+########################################
 # check if we have valgrind/valgrind.h
 
 valgrind_h=no
 cat > $TMPC << EOF
 #include <valgrind/valgrind.h>
-#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 int main(void) {
-  VALGRIND_STACK_DEREGISTER(0);
   return 0;
 }
 EOF
@@ -3397,6 +3412,10 @@ if test "$linux_magic_h" = "yes" ; then
   echo "CONFIG_LINUX_MAGIC_H=y" >> $config_host_mak
 fi
 
+if test "$pragma_disable_unused_but_set" = "yes" ; then
+  echo "CONFIG_PRAGMA_DISABLE_UNUSED_BUT_SET=y" >> $config_host_mak
+fi
+
 if test "$valgrind_h" = "yes" ; then
   echo "CONFIG_VALGRIND_H=y" >> $config_host_mak
 fi
diff --git a/coroutine-ucontext.c b/coroutine-ucontext.c
index e3c450b..784081a 100644
--- a/coroutine-ucontext.c
+++ b/coroutine-ucontext.c
@@ -200,14 +200,18 @@ Coroutine *qemu_coroutine_new(void)
 }
 
 #ifdef CONFIG_VALGRIND_H
+#ifdef CONFIG_PRAGMA_DISABLE_UNUSED_BUT_SET
 /* Work around an unused variable in the valgrind.h macro... */
 #pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
 static inline void valgrind_stack_deregister(CoroutineUContext *co)
 {
     VALGRIND_STACK_DEREGISTER(co->valgrind_stack_id);
 }
+#ifdef CONFIG_PRAGMA_DISABLE_UNUSED_BUT_SET
 #pragma GCC diagnostic error "-Wunused-but-set-variable"
 #endif
+#endif
 
 void qemu_coroutine_delete(Coroutine *co_)
 {
-- 
1.7.9.5