# HG changeset patch
# User Eric Blake <eblake@redhat.com>
# Date 1316203921 21600
# Node ID a508d7847f6d0e6e13868df1c1d0cef79279d835
# Parent  eab059ee71cc9ad439a7238412d6600e52475d2d
fdatasync: port to Solaris

Cater to Solaris requiring extra libraries for fdatasync.

* m4/fdatasync.m4 (gl_FUNC_FDATASYNC): Set LIB_FDATASYNC.
* modules/fdatasync (Link): Document it.
* modules/fdatasync-tests (test_fdatasync_LDADD): Link with it.

Signed-off-by: Eric Blake <eblake@redhat.com>

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,11 @@
 2011-09-16  Eric Blake  <eblake@redhat.com>
 
-	fdatasync: port to MacOS X 10.7.
+	fdatasync: port to Solaris
+	* m4/fdatasync.m4 (gl_FUNC_FDATASYNC): Set LIB_FDATASYNC.
+	* modules/fdatasync (Link): Document it.
+	* modules/fdatasync-tests (test_fdatasync_LDADD): Link with it.
+
+	fdatasync: port to MacOS X 10.7
 	* m4/fdatasync.m4 (gl_FUNC_FDATASYNC): Check for present but not
 	declared.
 	* m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Another default.
diff --git a/m4/fdatasync.m4 b/m4/fdatasync.m4
--- a/m4/fdatasync.m4
+++ b/m4/fdatasync.m4
@@ -1,4 +1,4 @@
-# fdatasync.m4 serial 2
+# fdatasync.m4 serial 3
 dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -7,13 +7,26 @@
 AC_DEFUN([gl_FUNC_FDATASYNC],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
-  AC_CHECK_FUNCS_ONCE([fdatasync])
-  if test $ac_cv_func_fdatasync = no; then
-    HAVE_FDATASYNC=0
-  fi
-  dnl MacOS X 10.7 has fdatasync but does not declare it.
+
+  dnl Using AC_CHECK_FUNCS_ONCE would break our subsequent AC_SEARCH_LIBS
   AC_CHECK_DECLS_ONCE([fdatasync])
+  LIB_FDATASYNC=
+  AC_SUBST([LIB_FDATASYNC])
+
   if test $ac_cv_have_decl_fdatasync = no; then
     HAVE_DECL_FDATASYNC=0
+    dnl MacOS X 10.7 has fdatasync but does not declare it.
+    AC_CHECK_FUNCS([fdatasync])
+    if test $ac_cv_func_fdatasync = no; then
+      HAVE_FDATASYNC=0
+    fi
+  else
+    dnl Solaris <= 2.6 has fdatasync() in libposix4.
+    dnl Solaris 7..10 has it in librt.
+    gl_saved_libs=$LIBS
+    AC_SEARCH_LIBS([fdatasync], [rt posix4],
+                   [test "$ac_cv_search_fdatasync" = "none required" ||
+                    LIB_FDATASYNC=$ac_cv_search_fdatasync])
+    LIBS=$gl_saved_libs
   fi
 ])
diff --git a/modules/fdatasync b/modules/fdatasync
--- a/modules/fdatasync
+++ b/modules/fdatasync
@@ -21,6 +21,9 @@
 Include:
 <unistd.h>
 
+Link:
+$(LIB_FDATASYNC)
+
 License:
 LGPLv2+
 
diff --git a/modules/fdatasync-tests b/modules/fdatasync-tests
--- a/modules/fdatasync-tests
+++ b/modules/fdatasync-tests
@@ -11,3 +11,4 @@
 Makefile.am:
 TESTS += test-fdatasync
 check_PROGRAMS += test-fdatasync
+test_fdatasync_LDADD = $(LDADD) $(LIB_FDATASYNC)