support shared build on unix

Makefile.frag

@@ -1,5 +1,10 @@
 phpdbg: $(BUILD_BINARY)
 
+phpdbg-shared: $(BUILD_SHARED)
+
+$(BUILD_SHARED): $(PHP_GLOBAL_OBJS) $(PHP_BINARY_OBJS) $(PHP_PHPDBG_OBJS)
+	$(BUILD_PHPDBG_SHARED)
+
 $(BUILD_BINARY): $(PHP_GLOBAL_OBJS) $(PHP_BINARY_OBJS) $(PHP_PHPDBG_OBJS)
 	$(BUILD_PHPDBG)
 

config.m4

@@ -27,6 +27,8 @@ if test "$PHP_PHPDBG" != "no"; then
   PHP_SELECT_SAPI(phpdbg, program, $PHP_PHPDBG_FILES, $PHP_PHPDBG_CFLAGS, [$(SAPI_PHPDBG_PATH)])
 
   BUILD_BINARY="sapi/phpdbg/phpdbg"
+  BUILD_SHARED="sapi/phpdbg/libphpdbg.la"
+  
   BUILD_PHPDBG="\$(LIBTOOL) --mode=link \
         \$(CC) -export-dynamic \$(CFLAGS_CLEAN) \$(EXTRA_CFLAGS) \$(EXTRA_LDFLAGS_PROGRAM) \$(LDFLAGS) \$(PHP_RPATHS) \
                 \$(PHP_GLOBAL_OBJS) \
@@ -36,9 +38,22 @@ if test "$PHP_PHPDBG" != "no"; then
                 \$(PHPDBG_EXTRA_LIBS) \
                 \$(ZEND_EXTRA_LIBS) \
          -o \$(BUILD_BINARY)"
+  
+  BUILD_PHPDBG_SHARED="\$(LIBTOOL) --mode=link \
+        \$(CC) -shared -Wl,-soname,libphpdbg.so -export-dynamic \$(CFLAGS_CLEAN) \$(EXTRA_CFLAGS) \$(EXTRA_LDFLAGS_PROGRAM) \$(LDFLAGS) \$(PHP_RPATHS) \
+                \$(PHP_GLOBAL_OBJS) \
+                \$(PHP_BINARY_OBJS) \
+                \$(PHP_PHPDBG_OBJS) \
+                \$(EXTRA_LIBS) \
+                \$(PHPDBG_EXTRA_LIBS) \
+                \$(ZEND_EXTRA_LIBS) \
+                \-DPHPDBG_SHARED \
+         -o \$(BUILD_SHARED)"
 
   PHP_SUBST(BUILD_BINARY)
+  PHP_SUBST(BUILD_SHARED)
   PHP_SUBST(BUILD_PHPDBG)
+  PHP_SUBST(BUILD_PHPDBG_SHARED)
 fi
 
 dnl ## Local Variables:

phpdbg.h

@@ -20,6 +20,14 @@
 #ifndef PHPDBG_H
 #define PHPDBG_H
 
+#ifdef PHP_WIN32
+# define PHPDBG_API __declspec(dllexport)
+#elif defined(__GNUC__) && __GNUC__ >= 4
+# define PHPDBG_API __attribute__ ((visibility("default")))
+#else
+# define PHPDBG_API
+#endif
+
 #include "php.h"
 #include "php_globals.h"
 #include "php_variables.h"