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Previously LIBXL_INIT_GC was an initialiser, which you were expected
to use like this:
libxl__gc gc = LIBXL_INIT_GC(ctx);

But we are going to want to put things in the gc which are to be
initialised using other macros. That means that LIBXL_INIT_GC has to
become a statement too. So instead, we make it so that it's used like this:
libxl_gc gc;
LIBXL_INIT_GC(gc,ctx);

In fact there is only one caller now, GC_INIT, which uses this trick:
libxl_gc gc[1];
LIBXL_INIT_GC(gc[0],ctx);

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
---
tools/libxl/libxl_internal.h | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 1d1dc35..d015c7c 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -145,7 +145,12 @@ typedef struct {
libxl_ctx *owner;
} libxl__gc;

-#define LIBXL_INIT_GC(ctx) (libxl__gc){ .alloc_maxsize = 0, .alloc_ptrs = 0, .owner = ctx }
+#define LIBXL_INIT_GC(gc,ctx) do{ \
+ (gc).alloc_maxsize = 0; \
+ (gc).alloc_ptrs = 0; \
+ (gc).owner = (ctx); \
+ } while(0)
+
static inline libxl_ctx *libxl__gc_owner(libxl__gc *gc)
{
return gc->owner;
@@ -676,7 +681,7 @@ libxl__device_model_version_running(libxl__gc *gc, uint32_t domid);
* as a local variable.
*/

-#define GC_INIT(ctx) libxl__gc gc[1] = { LIBXL_INIT_GC(ctx) }
+#define GC_INIT(ctx) libxl__gc gc[1]; LIBXL_INIT_GC(gc[0],ctx)
#define GC_FREE libxl__free_all(gc)
#define CTX libxl__gc_owner(gc)

--
1.7.2.5


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