Merge pull request #42 from argiopetech/master

Adds a more comprehensive check for fdatasync

Author: argiopetech

configure.ac

@@ -68,7 +68,26 @@ AC_CHECK_FUNCS([lutimes futimes])
 AC_CHECK_FUNCS([mkstemps mkdtemp])
 
 # Functions for file synchronization and allocation control
-AC_CHECK_FUNCS([fsync fdatasync])
+AC_CHECK_FUNCS([fsync])
+
+# A more comprehensive check that fdatasync exits
+# Necessary for platforms that have fdatasync in headers but have no
+# implementation
+dnl Originally provided by user copiousfreetime for the beanstalkd project
+dnl {{{ make sure that fdatasync exits
+AC_CACHE_CHECK([for fdatasync],[ac_cv_func_fdatasync],[
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <unistd.h>
+]],[[
+fdatasync(4);
+]])],
+[ac_cv_func_fdatasync=yes],
+[ac_cv_func_fdatasync=no])
+])
+AS_IF([test "x${ac_cv_func_fdatasync}" = "xyes"],
+ [AC_DEFINE([HAVE_FDATASYNC],[1],[If the system defines fdatasync])])
+dnl }}}
+
 AC_CHECK_FUNCS([posix_fadvise posix_fallocate])
 
 # Avoid adding rt if absent or unneeded