[Xen-users] configure.ac not correct with test about libm ? (patch included)

[Dieter Bloms <xensource.com@xxxxxxxx>]

Hi,

I want to compile xen-unstable (last commit 25622:3c426da4788e) on
alpinelinux.

During the run of configure there is an error message like:

"checking for isnan in -lm... no"

I discussed this with the maintainer of the alpinelinux distribution
and he told me, that the macro in configure.ac is wrong.

I found out, that isnan is a macro not a function, so we have to use
AC_CHECK_DECLS instead of AC_CHECK_LIB.

So made this little patch to get it work:

--snip--
diff -r 3c426da4788e tools/configure.ac
--- a/tools/configure.ac        Sun Jul 22 16:37:25 2012 +0100
+++ b/tools/configure.ac        Mon Jul 23 13:43:16 2012 +0200
@@ -133,7 +133,7 @@
 AC_SUBST(zlib)
 AC_CHECK_LIB([aio], [io_setup], [system_aio="y"], [system_aio="n"])
 AC_SUBST(system_aio)
-AC_CHECK_LIB([m], [isnan], [], [AC_MSG_ERROR([Could not find libm])])
+AC_CHECK_DECLS([isnan], [], [AC_MSG_ERROR([Could not find libm])], [[#include 
<math.h>]])
 AC_CHECK_LIB([crypto], [MD5], [], [AC_MSG_ERROR([Could not find libcrypto])])
 AC_CHECK_LIB([ext2fs], [ext2fs_open2], [libext2fs="y"], [libext2fs="n"])
 AC_SUBST(libext2fs)
--snip--

maybe someone of the developers is willing to add this little patch.


-- 
Best regards

  Dieter

--
I do not get viruses because I do not use MS software.
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