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bh=GQ2XcnQqp5UzH2zQOikz3azmRCb+OiUfQ3g+VYcLoJI=; b=HM+rs880wS2jE1lrBJLuVRVGtVxRloB6tArBUnED2t6nkPAC6PCCwiSCNUdU3PJc00jvia 5bBnxuKlUZnEOhDw== Date: Mon, 18 Mar 2024 08:32:34 +0100 (CET) From: Richard Biener To: YunQiang Su cc: gcc-patches@gcc.gnu.org, pinskia@gcc.gnu.org, i@maskray.me Subject: Re: [PATCH] Predefine __STRICT_ALIGN__ if STRICT_ALIGNMENT In-Reply-To: <20240317054631.848645-1-syq@gcc.gnu.org> Message-ID: <9sq13s1p-0r80-0354-71rs-4q3s1s050208@fhfr.qr> References: <20240317054631.848645-1-syq@gcc.gnu.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Authentication-Results: smtp-out2.suse.de; none X-Spam-Score: 1.90 X-Spamd-Result: default: False [1.90 / 50.00]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; NEURAL_SPAM_SHORT(3.00)[0.999]; NEURAL_HAM_LONG(-1.00)[-0.996]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCVD_COUNT_ZERO(0.00)[0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; BAYES_HAM(-0.00)[19.30%] X-Spam-Status: No, score=-11.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Sun, 17 Mar 2024, YunQiang Su wrote: > Arm32 predefines __ARM_FEATURE_UNALIGNED if -mno-unaligned-access, > and RISC-V predefines __riscv_misaligned_avoid, while other ports > that support -mstrict-align/-mno-unaligned-access don't have such > macro, and these backend macros are only avaiable for c-family. > Note: Arm64 always predefine __ARM_FEATURE_UNALIGNED: See #111555. > > Let's add a generic one. STRICT_ALIGNMENT is supposed to be gone, it doesn't tell the full truth so exposing it will cause more confusion only. Nak. Richard. > __STRICT_ALIGN__ is used instead of __STRICT_ALIGNMENT__, due to that > the later is used by some softwares, such as lzo2, syslinux etc. > > gcc > * cppbuiltin.cc: Predefine __STRICT_ALIGNMENT__ if > STRICT_ALIGNMENT. > --- > gcc/cppbuiltin.cc | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/gcc/cppbuiltin.cc b/gcc/cppbuiltin.cc > index c4bfc2917dc..d32efdf9a07 100644 > --- a/gcc/cppbuiltin.cc > +++ b/gcc/cppbuiltin.cc > @@ -123,6 +123,9 @@ define_builtin_macros_for_compilation_flags (cpp_reader *pfile) > > cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d", > flag_finite_math_only); > + > + if (STRICT_ALIGNMENT) > + cpp_define (pfile, "__STRICT_ALIGNMENT__"); > } > > > -- Richard Biener SUSE Software Solutions Germany GmbH, Frankenstrasse 146, 90461 Nuernberg, Germany; GF: Ivo Totev, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)