peer review: refactor HAVE_ANONYMOUS_INLINE_AGGREGATES and HAVE_EMPTY_AGGREGATES to conform to wolfssl convention -- defined() for true, !defined() for false -- while retaining ability for user override-off by passing in explicit 0 definition.

wolfssl/wolfcrypt/cryptocb.h

@@ -104,12 +104,12 @@ enum wc_CryptoCbCmdType {
 /* Crypto Information Structure for callbacks */
 typedef struct wc_CryptoInfo {
     int algo_type; /* enum wc_AlgoType */
-#if HAVE_ANONYMOUS_INLINE_AGGREGATES
+#ifdef HAVE_ANONYMOUS_INLINE_AGGREGATES
     union {
 #endif
     struct {
         int type; /* enum wc_PkType */
-#if HAVE_ANONYMOUS_INLINE_AGGREGATES
+#ifdef HAVE_ANONYMOUS_INLINE_AGGREGATES
         union {
 #endif
         #ifndef NO_RSA
@@ -279,7 +279,7 @@ typedef struct wc_CryptoInfo {
                 int         type; /* enum wc_PqcSignatureType */
             } pqc_sig_check;
         #endif
-#if HAVE_ANONYMOUS_INLINE_AGGREGATES
+#ifdef HAVE_ANONYMOUS_INLINE_AGGREGATES
         };
 #endif
     } pk;
@@ -287,7 +287,7 @@ typedef struct wc_CryptoInfo {
     struct {
         int type; /* enum wc_CipherType */
         int enc;
-#if HAVE_ANONYMOUS_INLINE_AGGREGATES
+#ifdef HAVE_ANONYMOUS_INLINE_AGGREGATES
         union {
 #endif
         #ifdef HAVE_AESGCM
@@ -375,7 +375,7 @@ typedef struct wc_CryptoInfo {
             } des3;
         #endif
             void* ctx;
-#if HAVE_ANONYMOUS_INLINE_AGGREGATES
+#ifdef HAVE_ANONYMOUS_INLINE_AGGREGATES
         };
 #endif
     } cipher;
@@ -387,7 +387,7 @@ typedef struct wc_CryptoInfo {
         const byte* in;
         word32 inSz;
         byte* digest;
-#if HAVE_ANONYMOUS_INLINE_AGGREGATES
+#ifdef HAVE_ANONYMOUS_INLINE_AGGREGATES
         union {
 #endif
         #ifndef NO_SHA
@@ -409,7 +409,7 @@ typedef struct wc_CryptoInfo {
             wc_Sha3* sha3;
         #endif
             void* ctx;
-#if HAVE_ANONYMOUS_INLINE_AGGREGATES
+#ifdef HAVE_ANONYMOUS_INLINE_AGGREGATES
         };
 #endif
     } hash;
@@ -454,7 +454,7 @@ typedef struct wc_CryptoInfo {
         void *ctx;
     } cmd;
 #endif
-#if HAVE_ANONYMOUS_INLINE_AGGREGATES
+#ifdef HAVE_ANONYMOUS_INLINE_AGGREGATES
     };
 #endif
 } wc_CryptoInfo;

wolfssl/wolfcrypt/types.h

@@ -123,36 +123,49 @@ decouple library dependencies with standard string, memory and so on.
 
     #ifndef HAVE_ANONYMOUS_INLINE_AGGREGATES
         /* if a version is available, pivot on the version, otherwise guess it's
-         * allowed, subject to override.
+         * disallowed, subject to override.
          */
         #if !defined(WOLF_C89) && (!defined(__STDC__)                \
             || (!defined(__STDC_VERSION__) && !defined(__cplusplus)) \
             || (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201101L)) \
             || (defined(__cplusplus) && (__cplusplus >= 201103L)))
             #define HAVE_ANONYMOUS_INLINE_AGGREGATES 1
-        #else
-            #define HAVE_ANONYMOUS_INLINE_AGGREGATES 0
         #endif
+    #elif ~(~HAVE_ANONYMOUS_INLINE_AGGREGATES + 1) == 1
+        /* forced on with empty value -- remap to 1 */
+        #undef HAVE_ANONYMOUS_INLINE_AGGREGATES
+        #define HAVE_ANONYMOUS_INLINE_AGGREGATES 1
+    #elif HAVE_ANONYMOUS_INLINE_AGGREGATES
+        /* forced on with explicit nonzero value -- leave as-is. */
+    #else
+        /* forced off with explicit zero value -- remap to undef. */
+        #undef HAVE_ANONYMOUS_INLINE_AGGREGATES
     #endif
 
     #ifndef HAVE_EMPTY_AGGREGATES
         /* The C standards don't define empty aggregates, but gcc and clang do.
          * We need to accommodate them for one of the same reasons C++ does --
-         * templates that conditionally result in empty aggregates, e.g. in
+         * conditionally empty aggregates, e.g. in hash.h.
-         * hash.h.
          */
         #if !defined(WOLF_C89) && defined(__GNUC__) &&  \
                 !defined(__STRICT_ANSI__) &&            \
-                HAVE_ANONYMOUS_INLINE_AGGREGATES + 0 == 1
+                defined(HAVE_ANONYMOUS_INLINE_AGGREGATES)
             #define HAVE_EMPTY_AGGREGATES 1
-        #else
-            #define HAVE_EMPTY_AGGREGATES 0
         #endif
+    #elif ~(~HAVE_EMPTY_AGGREGATES + 1) == 1
+        /* forced on with empty value -- remap to 1 */
+        #undef HAVE_EMPTY_AGGREGATES
+        #define HAVE_EMPTY_AGGREGATES 1
+    #elif HAVE_EMPTY_AGGREGATES
+        /* forced on with explicit nonzero value -- leave as-is. */
+    #else
+        /* forced off with explicit zero value -- remap to undef. */
+        #undef HAVE_EMPTY_AGGREGATES
     #endif
 
     #define _WOLF_AGG_DUMMY_MEMBER_HELPER2(a, b, c) a ## b ## c
     #define _WOLF_AGG_DUMMY_MEMBER_HELPER(a, b, c) _WOLF_AGG_DUMMY_MEMBER_HELPER2(a, b, c)
-    #if HAVE_EMPTY_AGGREGATES + 0 == 1
+    #ifdef HAVE_EMPTY_AGGREGATES
         /* swallow the semicolon with a zero-sized array (language extension
          * specific to gcc/clang).
          */
@@ -185,7 +198,6 @@ decouple library dependencies with standard string, memory and so on.
      * without disrupting clean flow/syntax when some enum values are
      * preprocessor-gated.
      */
-    #define WC_VALUE_OF(x) x
     #if defined(WOLF_C89) || defined(WOLF_NO_TRAILING_ENUM_COMMAS)
         #define _WOLF_ENUM_DUMMY_LAST_ELEMENT_HELPER2(a, b, c, d, e) a ## b ## c ## d ## e
         #define _WOLF_ENUM_DUMMY_LAST_ELEMENT_HELPER(a, b, c, d, e) _WOLF_ENUM_DUMMY_LAST_ELEMENT_HELPER2(a, b, c, d, e)