Q on AC_TRY_RUN

[Akim Demaille]

Would someone have an idea of why there is an exit right after the
./conftest in AC_TRY_RUN/AC_RUN_IFELSE?  I found nothing interesting
in the ChangeLog.

| # _AC_RUN_IFELSE(PROGRAM, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
| # ------------------------------------------------------------
| # Compile, link, and run.
| # This macro can be used during the selection of a compiler.
| m4_define([_AC_RUN_IFELSE],
| [m4_ifvanl([$1], [AC_LANG_CONFTEST([$1])])dnl
| rm -f conftest$ac_exeext
| if AC_TRY_EVAL(ac_link) &&
|    test -s conftest$ac_exeext && (./conftest$ac_exeext; exit) 2>/dev/null; 
then

The one right there.

|   m4_default([$2], :)
| else              
|   echo "$as_me: failed program was:" >&AS_MESSAGE_LOG_FD
|   cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD
| m4_ifvanl([$3], [  $3])dnl
| fi                
| rm -f conftest$ac_exeext ifval([$1], [conftest.$ac_ext])[]dnl
| ])# _AC_RUN_IFELSE