I have discovered a bug in
alsa-driver-0.9.7/utils/convert_isapnp_ids line 84.
Ordinarilly in GNU gawk, the line
if (match($0, "{.*}"))
works fine. However, if the environment
POSIXLY_CORRECT is set (it is on my system, since I
like things to be standards-compliant, although it
probably is not on most Linux systems), gawk has an
error on this line and compiling the drivers fails.
It gives this error message when making alsa-drivers:
awk:
/usr/src/alsa-driver-0.9.7/utils/convert_isapnp_ids:89:
(FILENAME=- FNR=27056) fatal: Invalid preceding
regular expression: /{.*}/
I don't know much about awk; I have used some regexes
though, and since I hadn't yet figured out why I was
getting this error message, I tried simply removing
the {}. The driver compiled correctly and works
correctly.
This problem is not, as far as I can tell, listed in
gawk's documentation as something that changes when
gawk runs in POSIX compatibilty mode. However, I
tried compiling the unmodified source without
POSIXLY_CORRECT set, which worked. I then immediately
did 'make clean ; setenv POSIXLY_CORRECT ; make' (csh)
and the problem occurred again, so I am quite certain
the bug is entirely because of POSIXLY_CORRECT being
set.
On a side note, since gawk doesn't even document this
discrepancy between POSIX and normal modes (though it
does have a long list of differences from POSIX, which
doesn't include this one), I also intend to file a
gawk bug, so that we can actually know when gawk is
going to break instead of spending a half hour trying
to get drivers to compile when the problem is just a
single environment variable.
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