Package: autoconf
Version: 2.64-1
After upgrading from autoconf 2.63 to 2.64 our configure.in script is
starting to fail due to the ac_fn_cxx_try_run helper function being
undefined on first use.
I tracked it down to a works or fails case depending on whether the
first instance of AC_RUN_IFELSE is wrapped in AC_CACHE_CHECK
WORKING:
AC_RUN_IFELSE([AC_LANG_SOURCE([[int main(){return 0;}]])],[],[],[])
AC_CACHE_CHECK(if working, foo_works,
AC_RUN_IFELSE([AC_LANG_SOURCE([[int main(){return
1;}]])],[foo_works=yes],[foo_works=no],[])
)
FAILING:
AC_CACHE_CHECK(if working, foo_works,
AC_RUN_IFELSE([AC_LANG_SOURCE([[int main(){return
1;}]])],[foo_works=yes],[foo_works=no],[])
)
AC_RUN_IFELSE([AC_LANG_SOURCE([[int main(){return 0;}]])],[],[],[])
In the working case the first instance of AC_RUN_IFELSE seems to trigger
a global very early setup definition to be added.
The second failing case, seems to only add the definition right inside
the if-else-fi statement created by AC_CACHE_CHECK immediately before
that usage. This definition is not available to other code outside that
scope which needs it later.
AYJ
--
To UNSUBSCRIBE, email to [email protected]
with a subject of "unsubscribe". Trouble? Contact [email protected]
