[PATCH 20/37] exa: Clean up warnings

[Keith Packard]

Declare GC ops/funcs as const.
Use 'typeof' in the 'swap' macro to capture the right type.

Signed-off-by: Keith Packard <keithp at keithp.com>
---
 exa/exa.c      |  4 ++--
 exa/exa_priv.h | 12 ++++++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/exa/exa.c b/exa/exa.c
index f8e499c..e961733 100644
--- a/exa/exa.c
+++ b/exa/exa.c
@@ -620,8 +620,8 @@ exaCreateGC(GCPtr pGC)
 
     swap(pExaScr, pScreen, CreateGC);
     if ((ret = (*pScreen->CreateGC) (pGC))) {
-        wrap(pExaGC, pGC, funcs, (GCFuncs *) &exaGCFuncs);
-        wrap(pExaGC, pGC, ops, (GCOps *) &exaOps);
+        wrap(pExaGC, pGC, funcs, &exaGCFuncs);
+        wrap(pExaGC, pGC, ops, &exaOps);
     }
     swap(pExaScr, pScreen, CreateGC);
 
diff --git a/exa/exa_priv.h b/exa/exa_priv.h
index 1f56056..aba3934 100644
--- a/exa/exa_priv.h
+++ b/exa/exa_priv.h
@@ -248,11 +248,19 @@ extern DevPrivateKeyRec exaScreenPrivateKeyRec;
     real->mem = priv->Saved##mem; \
 }
 
+#ifdef HAVE_TYPEOF
+#define swap(priv, real, mem) {\
+    typeof(real->mem) tmp = priv->Saved##mem; \
+    priv->Saved##mem = real->mem; \
+    real->mem = tmp; \
+}
+#else
 #define swap(priv, real, mem) {\
     void *tmp = priv->Saved##mem; \
     priv->Saved##mem = real->mem; \
     real->mem = tmp; \
 }
+#endif
 
 #define EXA_PRE_FALLBACK(_screen_) \
     ExaScreenPriv(_screen_); \
@@ -333,8 +341,8 @@ typedef struct {
 
 typedef struct {
     /* GC values from the layer below. */
-    GCOps *Savedops;
-    GCFuncs *Savedfuncs;
+    const GCOps *Savedops;
+    const GCFuncs *Savedfuncs;
 } ExaGCPrivRec, *ExaGCPrivPtr;
 
 typedef struct {
-- 
1.8.4.2