add code to check if we know flock definition on this system

In order to configure detect it and not fail the compile.
Not an ideal solution, suggestions are welcome on how to improve it.

diff --git a/ext/opcache/config.m4 b/ext/opcache/config.m4
index cbf7d5a19c08c388b402a2690f48c99318e63002..70cd4e9ecc62d39e6e755ab82abf7303a1865859 100644 (file)
--- a/ext/opcache/config.m4
+++ b/ext/opcache/config.m4
@@ -325,6 +325,39 @@ int main() {
     AC_DEFINE(HAVE_SHM_MMAP_FILE, 1, [Define if you have mmap() SHM support])
     msg=yes,msg=no,msg=no)
   AC_MSG_RESULT([$msg])
+
+  AC_MSG_CHECKING(for known struct flock definition)
+  dnl Copied from ZendAccelerator.h
+  AC_TRY_RUN([
+#include <fcntl.h>
+#include <stdlib.h>
+
+#ifndef ZEND_WIN32
+extern int lock_file;
+
+# if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || (defined(__APPLE__) && defined(__MACH__)/* Darwin */) || defined(__OpenBSD__) || defined(__NetBSD__)
+#  define FLOCK_STRUCTURE(name, type, whence, start, len) \
+                struct flock name = {start, len, -1, type, whence}
+# elif defined(__svr4__)
+#  define FLOCK_STRUCTURE(name, type, whence, start, len) \
+                struct flock name = {type, whence, start, len}
+# elif defined(__linux__) || defined(__hpux)
+#  define FLOCK_STRUCTURE(name, type, whence, start, len) \
+                struct flock name = {type, whence, start, len, 0}
+# elif defined(_AIX)
+#  if defined(_LARGE_FILES) || defined(__64BIT__)
+#   define FLOCK_STRUCTURE(name, type, whence, start, len) \
+                struct flock name = {type, whence, 0, 0, 0, start, len }
+#  else
+#   define FLOCK_STRUCTURE(name, type, whence, start, len) \
+                struct flock name = {type, whence, start, len}
+#  endif
+# else
+#  error "Don't know how to define struct flock"
+# endif
+#endif
+void main() {}
+], [], [AC_MSG_ERROR([Don't know how to define struct flock on this system[,] set --enable-opcache=no])], [])
   
   PHP_NEW_EXTENSION(opcache,
        ZendAccelerator.c \