AC_PROG_CC: try -qlanglvl=extc1x, for IBM XL C V12.1
commit55ccec071bea6bb7f08c4bbbf7d223c6892b5cdc
authorPaul Eggert <eggert@cs.ucla.edu>
Wed, 26 Sep 2012 14:49:59 +0000 (26 07:49 -0700)
committerPaul Eggert <eggert@cs.ucla.edu>
Wed, 26 Sep 2012 14:50:27 +0000 (26 07:50 -0700)
tree6f5c8912c25447c9c6033f0e6e30a28c311e737b
parent6cd9694ba8e0576da5a5ad33d8274698c8edc08c
AC_PROG_CC: try -qlanglvl=extc1x, for IBM XL C V12.1

* lib/autoconf/c.m4 (_AC_PROG_CC_C11): Add -qlanglvl=extc1x, for
IBM XL C V12.1.  It shouldn't pass the C11 test yet, since it's not
documented to support _Alignas, _Alignof, UTF-8 string literals,
and duplicate typedefs, but presumably it will eventually.
lib/autoconf/c.m4