In the top-level makefile, CFLAGS is defined in terms of CUDD_XCFLAGS on
every OS and architecture; the only difference between them is that
CFLAGS incorporates the value of OPTIMISE, whereas CUDD_XCFLAGS doesn't.
This is because the CUDD makefile draws a distinction between
"machine-independent flags" (ICFLAGS) and "machine-dependent flags"
(XCFLAGS), and the optimisation level is a machine-independent flag. The
same is true of DEBUG (-g) and WARNINGS (-Ox), but for some reason they
aren't treated the same way as OPTIMISE.
Rather than defining CFLAGS in terms of CUDD_XCFLAGS, do the following:
* define CFLAGS directly;
* remove CUDD_XCFLAGS;
* define ICFLAGS and XCFLAGS in the CUDD-related targets in terms of the
relevant flags in CFLAGS - i.e., extract the values (if any) of DEBUG,
OPTIMISE and WARNINGS from CFLAGS and pass them to the CUDD makefile
as ICFLAGS, and whatever's left as XCFLAGS.
This will also help to standardise the compiler flags used across all
the libraries (e.g., currently CUDD is compiled with -g but nothing else
is).
The use of $(filter-out) means that weird things might happen if DEBUG,
OPTIMISE or WARNINGS ever contain % symbols, but this (hopefully) isn't
likely...
Chris Novakovic
02ef2ff1ef