Re: proposal: remove traditional C support from lint

[Thomas Klausner <wiz%NetBSD.org@localhost>]

On Thu, Mar 18, 2021 at 09:38:22AM +0000, nia wrote:
> On Thu, Mar 18, 2021 at 09:01:47AM +0100, Roland Illig wrote:
> > Another thing is to check for GNU-specific C features such as
> > __FUNCTION__ (which is easy to avoid in C99), ({...}), array
> > initialization with [a...b], and so on.  I don't think even GCC can
> > reliably detect these.
> 
> Doesn't lint currently fail to check C on NetBSD unless you enable
> GNU extensions (-g) and "C9X mode" (-S)? I found it would always error
> on the system headers, which is really confusing default behaviour,
> especially on a BSD system where the system is supposed to be developed
> as a single unit.

Thanks for the hint!

I recently tried lint on some C code I'm developing, but didn't get very far:

lint -I ... file.c

cdefs.h(687): syntax error 'long' [249]
cdefs.h(688): syntax error 'unsigned' [249]
stdio.h(239): syntax error '__attribute__' [249]
stdio.h(246): syntax error '__attribute__' [249]
stdio.h(254): syntax error '__attribute__' [249]
stdio.h(261): syntax error '__attribute__' [249]
stdio.h(265): syntax error '__attribute__' [249]
stdio.h(265): cannot recover from previous errors [224]

lint -g -I ... file.c is better but still gives me warnings I can't do anything about:

pthread_types.h(128): warning: anonymous struct/union members is a C9X feature [49]
inttypes.h(66): warning: struct _locale never defined [233]
ansi.h(51): warning: struct __tag_wctrans_t never defined [233]
ansi.h(54): warning: struct __tag_wctype_t never defined [233]
types.h(323): warning: struct kauth_cred never defined [233]
pthread_types.h(61): warning: struct __pthread_st never defined [233]
pthread_types.h(70): warning: struct __pthread_spin_st never defined [233]
time.h(146): warning: struct sigevent never defined [233]
time.h(198): warning: struct __state never defined [233]

with -S, one more warning is removed, but still a lot remain:

inttypes.h(66): warning: struct _locale never defined [233]
ansi.h(51): warning: struct __tag_wctrans_t never defined [233]
ansi.h(54): warning: struct __tag_wctype_t never defined [233]
types.h(323): warning: struct kauth_cred never defined [233]
pthread_types.h(61): warning: struct __pthread_st never defined [233]
pthread_types.h(70): warning: struct __pthread_spin_st never defined [233]
time.h(146): warning: struct sigevent never defined [233]
time.h(198): warning: struct __state never defined [233]

NetBSD 9.99.81/amd64 from March 10.
 Thomas