* introduce a user-defined function `abc_info` that only prints out text when ABC_MAKE_VERBOSE is set
* replace all calls to $(info ...) with calls to $(call abc_info, ...)
To show the output build with ABC_MAKE_VERBOSE. for example
```
make ABC_MAKE_VERBOSE=1 ...
```
The `make clean` target consists of a single `rm` call that passes every
generated file, object file, and dependency directory. This results in
a command line that's around 53,800 characters long.
On Linux, the maximum length of a command line is 131,072 or 262,144
characters, however on Windows the limit is 32,768.
The 53,800 character command simply fails to run on Windows, which is a
problem when the first command that gets run is `make clean`.
Break this target into steps, first removing the output files, then the
object files, then any generated garbage, and then the object depedency
directories.
This fixes `make clean` (and as a result yosys) on Windows.
Signed-off-by: Sean Cross <sean@xobs.io>
(cherry picked from commit 11c4f998b2)
This is useful for cross-compilation, when build `ar` cannot handle
the target object files.
The invocation of `ranlib` is replaced with `ar s`, which is
equivalent and simplifies the build system a bit.
Usage:
Starting from an empty directory:
(1) set AS to point to the location of ABC
(2) reconstruct the directory structure of ABC in the new directory:
mkdir -p `cd $AS && find src -type d`
(3) Build ABC:
make -f $AS/Makefile VPATH=$AS ABCSRC=$AS
MiniSat (bsat) developed by Niklas Sorensson and modified by Alan Mishchenko. It’s development has reached
sufficient maturity to be committed in ABC, but still in a beta state.
TODO:
* Read compressed CNF files.
* Study the use of floating point for variables and clauses activity.
* Better documentation.
* Improve verbose messages.
* Expose parameters for tuning.
from V. Callegaro, F. S. Marranghello, M. G. A. Martins, R. P. Ribas and A. I. Reis,
entitled "Bottom-up disjoint-support decomposition based on cofactor and boolean difference analysis" presented in ICCD'15.