passing -no-undefined to libtool with autoconf/automake

[marco atzeri]

Hi All,

As latest gcc's are not ignoring anymore "-no-undefined"
and the configure halt with error if LDFLAGS="-no-undefined"
is defined in advance

--------------------------------------------
*** Startup tests
checking build system type... i686-pc-cygwin
checking host system type... i686-pc-cygwin
checking target system type... i686-pc-cygwin
checking for gcc... gcc
checking whether the C compiler works... no
configure: error: in `/pub/devel/openmpi/openmpi-1.7.2-1/build':
configure: error: C compiler cannot create executables
See `config.log' for more details
---------------------------------------------

I am currently building packages adding almost at the
end of configure.ac

----------------------------------------------
AC_MSG_CHECKING([if libtool needs -no-undefined flag to build shared 
libraries])
case "`uname`" in
   CYGWIN*|MINGW*|AIX*)
     ## Add in the -no-undefined flag to LDFLAGS for libtool.
     AC_MSG_RESULT([yes])
     LDFLAGS="$LDFLAGS -no-undefined"
     ;;
   *)
     ## Don't add in anything.
     AC_MSG_RESULT([no])
     ;;
esac
----------------------------------------------

just before  AC_CONFIG_FILES.

There is any better/practical way ?

Regards
Marco


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