export the pcre API when compiling with gcc 4. this fixes e.g. the linkage of APC (reported by shire)

ext/pcre/pcrelib/config.h

@@ -8,6 +8,16 @@
 #define SUPPORT_UCP
 #define SUPPORT_UTF8
 
+#if defined(__GNUC__) && __GNUC__ >= 4
+# ifdef __cplusplus
+#  define PCRE_EXP_DECL		extern "C" __attribute__ ((visibility("default")))
+# else
+#  define PCRE_EXP_DECL		extern __attribute__ ((visibility("default")))
+# endif
+# define PCRE_EXP_DEFN		__attribute__ ((visibility("default")))
+# define PCRE_EXP_DATA_DEFN	__attribute__ ((visibility("default")))
+#endif
+
 
 /* config.h.  Generated from config.h.in by configure.  */
 /* config.h.in.  Generated from configure.ac by autoheader.  */

ext/pcre/upgrade-pcre.php

@@ -106,6 +106,16 @@ $prepend_config_h = '
 #define SUPPORT_UCP
 #define SUPPORT_UTF8
 
+#if defined(__GNUC__) && __GNUC__ >= 4
+# ifdef __cplusplus
+#  define PCRE_EXP_DECL		extern "C" __attribute__ ((visibility("default")))
+# else
+#  define PCRE_EXP_DECL		extern __attribute__ ((visibility("default")))
+# endif
+# define PCRE_EXP_DEFN		__attribute__ ((visibility("default")))
+# define PCRE_EXP_DATA_DEFN	__attribute__ ((visibility("default")))
+#endif
+
 
 ';