On Mon, Dec 17, 2007 at 11:47:37PM +0000, Samuel Thibault wrote:
> On non-linux systems, the ioprio check correctly gets a program build
> failure:
> conftest.c:56: error: 'SYS_ioprio_get' undeclared (first use in this function)
> but the util_cv_syscall_ioprio_get still gets assigned 290 on i386 for
> instance, seemingly because the fallback is always used as last resort.
Nice, it seems the fallback really works ;-)
On non-linux systems we can simply disable the fallback (see a patch
below) or we needn't all UTIL_CHECK_SYSCALL code, because checking
for linux syscalls on non-linux systems is too optimistic...
Karel
>From a90ac948b4e97197116da3010e4439633806ad3f Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@xxxxxxxxxx>
Date: Tue, 18 Dec 2007 01:53:10 +0100
Subject: [PATCH] build-sys: disable syscall fallbacks for non-linux systems
Signed-off-by: Karel Zak <kzak@xxxxxxxxxx>
---
configure.ac | 24 +++++++++++++-----------
1 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/configure.ac b/configure.ac
index ca1c525..66bfa51 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,14 @@ esac
AC_PROG_CC_STDC
AC_GNU_SOURCE
+linux_os=no
+case ${host_os} in
+ *linux*)
+ linux_os=yes
+ ;;
+esac
+AM_CONDITIONAL([LINUX], test x$linux_os = xyes)
+
AC_PATH_PROG(PERL, perl)
AC_PATH_PROG(BLKID, blkid, [], [$PATH:/sbin])
AC_PATH_PROG(VOLID, vol_id, [], [$PATH:/lib/udev])
@@ -208,9 +216,11 @@ AC_DEFUN([UTIL_CHECK_SYSCALL], [
[syscall=_NR_$1],
[
syscall=no
- case $host_cpu in
- _UTIL_CHECK_SYSCALL_FALLBACK(m4_shift($@))
- esac
+ if test $linux_os = yes; then
+ case $host_cpu in
+ _UTIL_CHECK_SYSCALL_FALLBACK(m4_shift($@))
+ esac
+ fi
])
])
util_cv_syscall_$1=$syscall
@@ -294,14 +304,6 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[AC_MSG_NOTICE([Your libc thinks that swapon has 1 arg only.])
])
-case ${host_os} in
- *linux*)
- AM_CONDITIONAL([LINUX], [true])
- ;;
- *)
- AM_CONDITIONAL([LINUX], [false])
- ;;
-esac
dnl UTIL_SET_ARCH(ARCHNAME, PATTERN)
dnl ---------------------------------
--
1.5.3.1
-
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