icebox_vlog: Save error message to file and print it.
Previously if you were doing;
`icebox_vlog example.asc > example_bit.v` you would just get;
```
Traceback (most recent call last):
File "icebox_vlog.py", line 947, in <module>
assert False
AssertionError
```
Now you get;
```
Traceback (most recent call last):
File "icebox_vlog.py", line 948, in <module>
assert False, "\n ".join(emsg)
AssertionError: Single-driver-check failed for 2 nets:
n10 has 0 drivers: []
n15 has 2 drivers: ['clk', 'clk2']
```
diff --git a/icebox/icebox_vlog.py b/icebox/icebox_vlog.py
index 21ffb12..9f5b602 100755
--- a/icebox/icebox_vlog.py
+++ b/icebox/icebox_vlog.py
@@ -941,8 +941,9 @@
print()
if failed_drivers_check:
- print("// Single-driver-check failed for %d nets:" % len(failed_drivers_check))
+ emsg = ["Single-driver-check failed for %d nets:" % len(failed_drivers_check)]
for net, drivers in failed_drivers_check:
- print("// %s has %d drivers: %s" % (net, len(drivers), drivers))
- assert False
+ emsg.append("%s has %d drivers: %s" % (net, len(drivers), drivers))
+ print("//", "\n//".join(emsg))
+ assert False, "\n ".join(emsg)
