commit 291ca30f185bdd47d744c1d616dd50857cd96f9c
Author: Benjamin Gordon <bmgordon@chromium.org>
Date:   Thu Sep 3 17:08:30 2020 -0600

    Add explicit pointer casts
    
    mem_resize returns a void*, which needs to be explicitly cast to the
    expected result type when compiler warnings are enabled.

diff --git a/airscan-mdns.c b/airscan-mdns.c
index 55cae5b..5ef4a46 100644
--- a/airscan-mdns.c
+++ b/airscan-mdns.c
@@ -621,7 +621,10 @@ mdns_avahi_browser_callback (AvahiServiceBrowser *b, AvahiIfIndex interface,
         AvahiLookupResultFlags flags, void* userdata)
 {
     mdns_finding    *mdns;
+#pragma clang diagnostics push
     MDNS_SERVICE    service = (MDNS_SERVICE) userdata;
+#pragma clang diagnostic ignored "-Wvoid-pointer-to-enum-cast"
+#pragma clang diagnostics pop
     ZEROCONF_METHOD method = mdns_service_to_method(service);
     bool            initscan = mdns_initscan[service];
 
diff --git a/airscan.h b/airscan.h
index 75034ac..b196330 100644
--- a/airscan.h
+++ b/airscan.h
@@ -328,7 +328,7 @@ __mem_shrink (void *p, size_t len, size_t elsize);
  */
 static inline char*
 str_new (void) {
-    char *s = mem_resize((char*) NULL, 0, 1);
+    char *s = (char *)mem_resize((char*) NULL, 0, 1);
     *s = '\0';
     return s;
 }
@@ -339,7 +339,7 @@ static inline char*
 str_dup (const char *s1)
 {
     size_t len = strlen(s1);
-    char   *s = mem_resize((char*) NULL, len, 1);
+    char   *s = (char *)mem_resize((char*) NULL, len, 1);
     memcpy(s, s1, len + 1);
     return s;
 }
@@ -376,7 +376,7 @@ str_trunc (char *s)
 static inline char*
 str_resize (char *s, size_t len)
 {
-    s = mem_resize(s, len, 1);
+    s = (char *)mem_resize(s, len, 1);
     s[len] = '\0';
     return s;
 }
@@ -392,7 +392,7 @@ str_append_mem (char *s1, const char *s2, size_t l2)
 {
     size_t l1 = mem_len(s1);
 
-    s1 = mem_resize(s1, l1 + l2, 1);
+    s1 = (char *)mem_resize(s1, l1 + l2, 1);
     memcpy(s1 + l1, s2, l2);
     s1[l1+l2] = '\0';
 
@@ -524,7 +524,7 @@ static inline void**
 __ptr_array_append (void **a, void *p)
 {
     size_t len = mem_len(a) + 1;
-    a = mem_resize(a, len, 1);
+    a = (void **)mem_resize(a, len, 1);
     a[len - 1] = p;
     a[len] = NULL;
     return a;
@@ -1875,7 +1875,7 @@ static inline SANE_Word*
 sane_word_array_append (SANE_Word *a, SANE_Word w)
 {
     size_t len = sane_word_array_len(a) + 1;
-    a = mem_resize(a, len + 1, 0);
+    a = (SANE_Word *)mem_resize(a, len + 1, 0);
     a[0] = len;
     a[len] = w;
     return a;
@@ -1901,7 +1901,7 @@ sane_word_array_intersect_sorted ( const SANE_Word *a1, const SANE_Word *a2);
 static inline SANE_String*
 sane_string_array_new (void)
 {
-    return ptr_array_new(SANE_String);
+    return (SANE_String*)ptr_array_new(SANE_String);
 }
 
 /* Free array of SANE_String
@@ -1946,7 +1946,7 @@ sane_string_array_max_strlen(const SANE_String *a);
 static inline const SANE_Device**
 sane_device_array_new (void)
 {
-    return ptr_array_new(SANE_Device*);
+    return (const SANE_Device**)ptr_array_new(SANE_Device*);
 }
 
 /* Free array of SANE_Device