Ancillary changes to configure.ac/Makefile.am to ensure that both
CFLAGS and AM_CFLAGS are honored for all object files and don't
step on each other.
(AM_CFLAGS is only applied to targets that don't have a _CFLAGS of their own, so we either have to not define _CFLAGS, or we have to explicitly add AM_CFLAGS to _CFLAGS.)
Ancillary changes to configure.ac/Makefile.am to ensure that both CFLAGS and AM_CFLAGS are honored for all object files and don't step on each other.
(AM_CFLAGS is only applied to targets that don't have a_CFLAGS of their own, so we either have to not define _CFLAGS, or we have to explicitly add AM_CFLAGS to _CFLAGS.)