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From ec8c1a258c18a07171f5316f5150da9b15ad53c3 Mon Sep 17 00:00:00 2001
From: Marc Dionne <marc.dionne@your-file-system.com>
Date: Mon, 6 Jul 2015 12:00:10 -0300
Subject: [PATCH 4/6] Linux: Add AC_CHECK_LINUX_OPERATION configure macro
Add a new macro to check the signature of a particular
operation against a provided typed argument list.
One of the arguments is an arbitrary label that is used
to construct the pre-processor define name. This will
allow for testing of different forms for the same
operation.
This can be used to replace many of the remaining odd
checks in src/cf/linux_test4.m4.
Reviewed-on: http://gerrit.openafs.org/11927
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit c2c0b6bc86c6d67814d0f7fe14fa8eefc445b4a4)
Change-Id: Id929412d87bb9fc38b2b599abbe3fddca3cda4b1
Reviewed-on: http://gerrit.openafs.org/11950
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
(cherry picked from commit dfcf0b348886b4a97d2c8a8b90eae98ad9e25834)
---
src/cf/linux-test1.m4 | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/src/cf/linux-test1.m4 b/src/cf/linux-test1.m4
index f7176d2..fd5bfd8 100644
--- a/src/cf/linux-test1.m4
+++ b/src/cf/linux-test1.m4
@@ -150,3 +150,18 @@ AC_DEFUN([AC_CHECK_LINUX_TYPED_STRUCT],
[Define if kernel typedef'd $1 has the $2 element])
])
+dnl AC_CHECK_LINUX_OPERATION([structure], [operation], [label], [includes], [return_type], [args])
+AC_DEFUN([AC_CHECK_LINUX_OPERATION],
+ [AS_VAR_PUSHDEF([ac_linux_operation], [ac_cv_linux_operation_$1_$2_$3])
+ AC_CACHE_CHECK([operation $2 in $1], [ac_linux_operation],
+ [save_CPPFLAGS="$CPPFLAGS"
+ CPPFLAGS="$CPPFLAGS -Werror"
+ AC_TRY_KBUILD([$4], [struct $1 ops; $5 op($6) { return ($5)0; }; ops.$2 = op;],
+ AS_VAR_SET([ac_linux_operation], [yes]),
+ AS_VAR_SET([ac_linux_operation], [no]))
+ CPPFLAGS="$save_CPPFLAGS"
+ ])
+ AS_IF([test AS_VAR_GET([ac_linux_operation]) = yes],
+ [AC_DEFINE(AS_TR_CPP(HAVE_LINUX_$1_$2_$3), 1,
+ [Define if $1 has $2 operation of form $6])])
+ ])
--
2.5.1
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