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Make stack-protector check use AC_LINK_IFELSE.

--- a/configure.ac

+++ b/configure.ac

@@ -224,7 +224,7 @@

 saved_CFLAGS="$CFLAGS"

 CFLAGS="$CFLAGS -fstack-protector-all"

 AC_MSG_CHECKING([if ${CC} supports -fstack-protector-all])

-AC_COMPILE_IFELSE([AC_LANG_SOURCE([char foo;])],

+AC_LINK_IFELSE([AC_LANG_SOURCE([void main(void){char foo;}])],

       [ AC_MSG_RESULT([yes])

         STACK_PROTECTOR="-fstack-protector-all" ],

         AC_MSG_RESULT([no]))