-msg_* flags for cc on osf

[Peter O'Gorman]

Hi,

Bob wanted to add -msg_disable badboundchk,unusedincl to his CFLAGS on
Tru64 5.1 using the native compiler, there was a problem though. We have
a rule that lets all, otherwise unknown flags beginning with -m through
to the linker. However, we don't expect -mfoo to have an argument, so we
do not let through the argument. This results in a link error for Bob.

This patch lets libtool know about all flags beginning with -msg_ and
says to not pass them through to the linker.

There are some questions, do any other compilers use flags beginning
with -msg_ that do not take an argument and that need to be passed
through to the linker? If that is the case then this patch is wrong. I
think, however, that since we pass -m* through we should take the chance
on this, rather than staying with the status-quo on the off-chance that
there might be a system somewhere that requires -msg_something being
passed to the linker.

I won't apply this without explicit approval from someone !Bob (sorry
Bob).

Thoughts? Are there any real systems that this would break?

Peter

msg_.patch
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