[src/trunk]: src/usr.bin/xlint/lint1 lint: allow large integer types for bit-...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/40f8ab2251ee
branches:  trunk
changeset: 983094:40f8ab2251ee
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun May 02 22:07:49 2021 +0000

description:
lint: allow large integer types for bit-fields in GCC mode

These types are explicitly allowed by GCC.

I'm not sure which of the flags -g and -p should be stronger.  That is,
if both -g and -p are given, should 'unsigned char' be allowed as a
bit-field type since -g would allow it, or should it be warned about
since -p warns about it?  For now, continue to warn about these.

diffstat:

 tests/usr.bin/xlint/lint1/gcc_bit_field_types.c   |  12 ++++++------
 tests/usr.bin/xlint/lint1/gcc_bit_field_types.exp |   4 ----
 usr.bin/xlint/lint1/decl.c                        |   6 +++---
 3 files changed, 9 insertions(+), 13 deletions(-)

diffs (60 lines):

diff -r 4ac98d027db9 -r 40f8ab2251ee tests/usr.bin/xlint/lint1/gcc_bit_field_types.c
--- a/tests/usr.bin/xlint/lint1/gcc_bit_field_types.c   Sun May 02 21:48:53 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/gcc_bit_field_types.c   Sun May 02 22:07:49 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: gcc_bit_field_types.c,v 1.2 2021/05/02 21:47:28 rillig Exp $   */
+/*     $NetBSD: gcc_bit_field_types.c,v 1.3 2021/05/02 22:07:49 rillig Exp $   */
 # 3 "gcc_bit_field_types.c"
 
 /*
@@ -13,9 +13,9 @@
 struct example {
        int int_flag: 1;
        unsigned int unsigned_int_flag: 1;
-       long long_flag: 1;      /* expect: 35 *//*FIXME*/
-       unsigned long unsigned_long_flag: 1;    /* expect: 35 *//*FIXME*/
-       long long long_long_flag: 1;    /* expect: 35 *//*FIXME*/
-       unsigned long long unsigned_long_long_flag: 1;  /* expect: 35 *//*FIXME*/
-       double double_flag: 1;  /* expect: 35 */
+       long long_flag: 1;
+       unsigned long unsigned_long_flag: 1;
+       long long long_long_flag: 1;
+       unsigned long long unsigned_long_long_flag: 1;
+       double double_flag: 1;  /* expect: illegal bit-field type 'double' */
 };
diff -r 4ac98d027db9 -r 40f8ab2251ee tests/usr.bin/xlint/lint1/gcc_bit_field_types.exp
--- a/tests/usr.bin/xlint/lint1/gcc_bit_field_types.exp Sun May 02 21:48:53 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/gcc_bit_field_types.exp Sun May 02 22:07:49 2021 +0000
@@ -1,5 +1,1 @@
-gcc_bit_field_types.c(16): warning: illegal bit-field type 'long' [35]
-gcc_bit_field_types.c(17): warning: illegal bit-field type 'unsigned long' [35]
-gcc_bit_field_types.c(18): warning: illegal bit-field type 'long long' [35]
-gcc_bit_field_types.c(19): warning: illegal bit-field type 'unsigned long long' [35]
 gcc_bit_field_types.c(20): warning: illegal bit-field type 'double' [35]
diff -r 4ac98d027db9 -r 40f8ab2251ee usr.bin/xlint/lint1/decl.c
--- a/usr.bin/xlint/lint1/decl.c        Sun May 02 21:48:53 2021 +0000
+++ b/usr.bin/xlint/lint1/decl.c        Sun May 02 22:07:49 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: decl.c,v 1.179 2021/05/02 21:48:53 rillig Exp $ */
+/* $NetBSD: decl.c,v 1.180 2021/05/02 22:07:49 rillig Exp $ */
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All Rights Reserved.
@@ -38,7 +38,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: decl.c,v 1.179 2021/05/02 21:48:53 rillig Exp $");
+__RCSID("$NetBSD: decl.c,v 1.180 2021/05/02 22:07:49 rillig Exp $");
 #endif
 
 #include <sys/param.h>
@@ -1121,7 +1121,7 @@
                 * regardless of BITFIELDTYPE. Integer types not dealt with
                 * above are okay only if BITFIELDTYPE is in effect.
                 */
-               if (!bitfieldtype_ok || !is_integer(t)) {
+               if (!(bitfieldtype_ok || gflag) || !is_integer(t)) {
                        /* illegal bit-field type '%s' */
                        warning(35, type_name(tp));
                        int sz = tp->t_flen;