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lint: work around a possible compiler error on arm and powerpc

This commit is contained in:
rillig 2023-07-19 22:24:28 +00:00
parent ad3db949b1
commit 57e6976b41
1 changed files with 16 additions and 5 deletions
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21
usr.bin/xlint/lint1/lint1.h
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@ -1,4 +1,4 @@
/* $NetBSD: lint1.h,v 1.194 2023/07/15 13:35:24 rillig Exp $ */
/* $NetBSD: lint1.h,v 1.195 2023/07/19 22:24:28 rillig Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved.
@ -85,11 +85,22 @@ typedef struct strg {
void *st_mem; /* char[] for st_char, or wchar_t[] */
} strg_t;
// TODO: Use bit-fields instead of plain bool, but keep an eye on arm and
// powerpc, on which GCC 10.5.0 generates code that leads to extra 327
// warnings, even in msg_327.c, which does not contain any type qualifier at
// all. A possible starting point for continuing the investigation is that
// type_qualifiers is a very small struct that contains only bool bit-fields,
// and this struct is a member of the parser's union.
//
// Instead of using plain bool instead of bit-fields, an alternative workaround
// is to compile cgram.c with -Os or -O1 instead of -O2. The generated code
// between -Os and -O2 differs too much though to give a hint at the root
// cause.
typedef struct {
bool tq_const:1;
bool tq_restrict:1;
bool tq_volatile:1;
bool tq_atomic:1;
bool tq_const;
bool tq_restrict;
bool tq_volatile;
bool tq_atomic;
} type_qualifiers;
/* A bool, integer or floating-point value. */