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c3c949e98e
XL C 16.1.1 Community Edition for Linux generated three warnings for
every file:
In file included from ./tcpdump.c:155:
./netdissect.h:254:8: warning: 1540-2990 The attribute
"__attribute__((format(printf, 2, 3)))" is not supported. The
attribute is ignored.
PRINTFLIKE_FUNCPTR(2, 3);
^
./netdissect.h:259:10: warning: 1540-2990 The attribute
" __attribute__((format(printf, 3, 4)))" is not supported.
The attribute is ignored.
PRINTFLIKE_FUNCPTR(3, 4);
^
./netdissect.h:263:9: warning: 1540-2990 The attribute
" __attribute__((format(printf, 2, 3)))" is not supported. The
attribute is ignored.
PRINTFLIKE_FUNCPTR(2, 3);
^
As it turns out, this is a bug in the compiler. In compiler-tests.h
update ND_IS_AT_LEAST_XL_C_VERSION() to tell newer XL C versions. In
funcattrs.h exempt XL C 16.1 from PRINTFLIKE_FUNCPTR().
In the course of preparing these changes notice that XL C uses the Clang
block in diag-control.h (XL C mimics both Clang and GCC to some extent),
although the behaviour is different between the two compilers. Add a new
block for XL C there.
In build_common.sh add more comments to explain XL C quirks and detect
XL C for Linux too so it receives the right CFLAGS. Update CHANGES to
mention this and earlier improvements.
153 lines
5.5 KiB
C
153 lines
5.5 KiB
C
/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
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/*
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* Copyright (c) 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lib_funcattrs_h
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#define lib_funcattrs_h
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#include "compiler-tests.h"
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/*
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* Attributes to apply to functions and their arguments, using various
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* compiler-specific extensions.
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*/
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/*
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* This was introduced by Clang:
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*
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* https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
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*
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* in some version (which version?); it has been picked up by GCC 5.0.
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*/
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#ifndef __has_attribute
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/*
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* It's a macro, so you can check whether it's defined to check
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* whether it's supported.
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*
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* If it's not, define it to always return 0, so that we move on to
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* the fallback checks.
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*/
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#define __has_attribute(x) 0
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#endif
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/*
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* NORETURN, before a function declaration, means "this function
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* never returns". (It must go before the function declaration, e.g.
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* "extern NORETURN func(...)" rather than after the function
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* declaration, as the MSVC version has to go before the declaration.)
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*/
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#if __has_attribute(noreturn) \
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|| ND_IS_AT_LEAST_GNUC_VERSION(2,5) \
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|| ND_IS_AT_LEAST_SUNC_VERSION(5,9) \
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|| ND_IS_AT_LEAST_XL_C_VERSION(10,1) \
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|| ND_IS_AT_LEAST_HP_C_VERSION(6,10)
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/*
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* Compiler with support for __attribute((noreturn)), or GCC 2.5 and
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* later, or Solaris Studio 12 (Sun C 5.9) and later, or IBM XL C 10.1
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* and later (do any earlier versions of XL C support this?), or
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* HP aCC A.06.10 and later.
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*/
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#define NORETURN __attribute((noreturn))
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/*
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* However, GCC didn't support that for function *pointers* until GCC
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* 4.1.0; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3481.
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*
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* Sun C/Oracle Studio C doesn't seem to support it, either.
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*/
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#if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) < 401)) \
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|| (defined(__SUNPRO_C))
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#define NORETURN_FUNCPTR
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#else
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#define NORETURN_FUNCPTR __attribute((noreturn))
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#endif
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#elif defined(_MSC_VER)
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/*
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* MSVC.
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* It doesn't allow __declspec(noreturn) to be applied to function
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* pointers.
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*/
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#define NORETURN __declspec(noreturn)
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#define NORETURN_FUNCPTR
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#else
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#define NORETURN
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#define NORETURN_FUNCPTR
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#endif
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/*
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* PRINTFLIKE(x,y), after a function declaration, means "this function
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* does printf-style formatting, with the xth argument being the format
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* string and the yth argument being the first argument for the format
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* string".
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*/
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#if __has_attribute(__format__) \
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|| ND_IS_AT_LEAST_GNUC_VERSION(2,3) \
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|| ND_IS_AT_LEAST_XL_C_VERSION(10,1) \
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|| ND_IS_AT_LEAST_HP_C_VERSION(6,10)
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/*
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* Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1
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* and later (do any earlier versions of XL C support this?),
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* or HP aCC A.06.10 and later.
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*/
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#define PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
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/*
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* However, GCC didn't support that for function *pointers* until GCC
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* 4.1.0; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3481.
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* XL C 16.1 (and possibly some earlier versions, but not 12.1 or 13.1) has
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* a similar bug, a bugfix for which should be available later:
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* https://www.ibm.com/support/pages/apar/LI81402
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*/
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#if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) < 401)) || \
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(ND_IS_AT_LEAST_XL_C_VERSION(16,1) && !ND_IS_AT_LEAST_XL_C_VERSION(16,2))
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#define PRINTFLIKE_FUNCPTR(x,y)
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#else
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#define PRINTFLIKE_FUNCPTR(x,y) __attribute__((__format__(__printf__,x,y)))
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#endif
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#else
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#define PRINTFLIKE(x,y)
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#define PRINTFLIKE_FUNCPTR(x,y)
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#endif
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/*
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* For flagging arguments as format strings in MSVC.
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*/
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#ifdef _MSC_VER
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#include <sal.h>
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#define FORMAT_STRING(p) _Printf_format_string_ p
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#else
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#define FORMAT_STRING(p) p
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#endif
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#endif /* lib_funcattrs_h */
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