apr.h: __attribute__ and __has_attribute exist for !__GNUC__ compiler…

…s. PR 69009.

There are more compilers than __GNUC__ that provide __attribute__ so let's not
no-op it based on (un)known compilers but simply if it's not already defined
(it should be provided as a pre-defined macro if defined by the compiler).

While at, do the same for __has_attribute.

Submitted by: Petr Sumbera <petr.sumbera oracle.com>
Merges r1917746 from trunk


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.8.x@1917747 13f79535-47bb-0310-9956-ffa450edef68

include/apr.h.in

@@ -47,26 +47,33 @@
 
 /* So that we can use inline on some critical functions, and use
  * GNUC attributes (such as to get -Wall warnings for printf-like
- * functions).  Only do this in gcc 2.7 or later ... it may work
- * on earlier stuff, but why chance it.
+ * functions).  Both __inline__ and __attribute__ exist for gcc >= 2.7,
+ * other !__GNUC__ compilers may provide __attribute__ still.
  *
  * We've since discovered that the gcc shipped with NeXT systems
  * as "cc" is completely broken.  It claims to be __GNUC__ and so
  * on, but it doesn't implement half of the things that __GNUC__
  * means.  In particular it's missing inline and the __attribute__
  * stuff.  So we hack around it.  PR#1613. -djg
  */
-#if !defined(__GNUC__) || __GNUC__ < 2 || \
-    (__GNUC__ == 2 && __GNUC_MINOR__ < 7) ||\
-    defined(NEXT)
-#ifndef __attribute__
+#if defined(__GNUC__) \
+    && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)) \
+    && !defined(NEXT)
+#define APR_INLINE  __inline__
+#define APR_HAS_INLINE          1
+#else  /* !__GNUC__ */
+#define APR_INLINE
+#define APR_HAS_INLINE          0
+/* __has_attribute should always be a pre-defined macro, but not
+ * necessarily __attribute__ (e.g. builtin), so check for both to
+ * avoid overriding __attribute__.
+ */
+#if !(defined(__attribute__) || defined(__has_attribute))
 #define __attribute__(__x)
 #endif
-#define APR_INLINE
-#define APR_HAS_INLINE           0
-#else
-#define APR_INLINE __inline__
-#define APR_HAS_INLINE           1
+#endif /* !__GNUC__ */
+#ifndef __has_attribute
+#define __has_attribute(__x)    0
 #endif
 
 #define APR_HAVE_ARPA_INET_H     @arpa_ineth@

include/apr.hnw

@@ -85,6 +85,9 @@ extern "C" {
 #ifndef __attribute__
 #define __attribute__(__x)
 #endif
+#ifndef __has_attribute
+#define __has_attribute(__x)            0
+#endif
 #define ENUM_BITFIELD(e,n,w)  signed int n : w
 
 #define APR_HAVE_CONIO_H                0

include/apr.hw

@@ -125,11 +125,41 @@
  * are platform specific and should NOT be relied upon!</em></strong>
  */
 
-#define APR_INLINE __inline
+/* So that we can use inline on some critical functions, and use
+ * GNUC attributes (such as to get -Wall warnings for printf-like
+ * functions).  Both __inline__ and __attribute__ exist for gcc >= 2.7,
+ * other !__GNUC__ compilers may provide __attribute__ still.
+ *
+ * We've since discovered that the gcc shipped with NeXT systems
+ * as "cc" is completely broken.  It claims to be __GNUC__ and so
+ * on, but it doesn't implement half of the things that __GNUC__
+ * means.  In particular it's missing inline and the __attribute__
+ * stuff.  So we hack around it.  PR#1613. -djg
+ */
+#if defined(__GNUC__) \
+    && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)) \
+    && !defined(NEXT)
+#define APR_INLINE  __inline__
+#define APR_HAS_INLINE          1
+#else  /* !__GNUC__ */
+#if defined(_MSC_VER)
+#define APR_INLINE  __inline
 #define APR_HAS_INLINE          1
-#if !defined(__GNUC__) && !defined(__attribute__)
+#else  /* !_MSC_VER */
+#define APR_INLINE
+#define APR_HAS_INLINE          0
+#endif /* !_MSC_VER */
+/* __has_attribute should always be a pre-defined macro, but not
+ * necessarily __attribute__ (e.g. builtin), so check for both to
+ * avoid overriding __attribute__.
+ */
+#if !(defined(__attribute__) || defined(__has_attribute))
 #define __attribute__(__x)
 #endif
+#endif /* !__GNUC__ */
+#ifndef __has_attribute
+#define __has_attribute(__x)    0
+#endif
 
 #ifndef _WIN32_WCE
 #define APR_HAVE_ARPA_INET_H    0

include/apr.hwc

@@ -112,11 +112,41 @@
  * are platform specific and should NOT be relied upon!</em></strong>
  */
 
-#define APR_INLINE __inline
+/* So that we can use inline on some critical functions, and use
+ * GNUC attributes (such as to get -Wall warnings for printf-like
+ * functions).  Both __inline__ and __attribute__ exist for gcc >= 2.7,
+ * other !__GNUC__ compilers may provide __attribute__ still.
+ *
+ * We've since discovered that the gcc shipped with NeXT systems
+ * as "cc" is completely broken.  It claims to be __GNUC__ and so
+ * on, but it doesn't implement half of the things that __GNUC__
+ * means.  In particular it's missing inline and the __attribute__
+ * stuff.  So we hack around it.  PR#1613. -djg
+ */
+#if defined(__GNUC__) \
+    && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)) \
+    && !defined(NEXT)
+#define APR_INLINE  __inline__
+#define APR_HAS_INLINE          1
+#else  /* !__GNUC__ */
+#if defined(_MSC_VER)
+#define APR_INLINE  __inline
 #define APR_HAS_INLINE          1
-#if !defined(__GNUC__) && !defined(__attribute__)
+#else  /* !_MSC_VER */
+#define APR_INLINE
+#define APR_HAS_INLINE          0
+#endif /* !_MSC_VER */
+/* __has_attribute should always be a pre-defined macro, but not
+ * necessarily __attribute__ (e.g. builtin), so check for both to
+ * avoid overriding __attribute__.
+ */
+#if !(defined(__attribute__) || defined(__has_attribute))
 #define __attribute__(__x)
 #endif
+#endif /* !__GNUC__ */
+#ifndef __has_attribute
+#define __has_attribute(__x)    0
+#endif
 
 #ifndef _WIN32_WCE
 #define APR_HAVE_ARPA_INET_H    0