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For the new use of cc-option to work we cannot pass -S to the compiler anymore. We need the compiler to actually invoke the assembler, so switch to using -c. Signed-off-by: Jan Beulich --- a/Config.mk +++ b/Config.mk @@ -1,4 +1,6 @@ -# +# Convenient variables +comma := , + # Compare $(1) and $(2) and replace $(2) with $(1) if they differ # # Typically $(1) is a newly generated file and $(2) is the target file @@ -20,7 +22,7 @@ endef # # Usage: cflags-y += $(call cc-option,$(CC),-march=winchip-c6,-march=i586) cc-option = $(shell if test -z "`echo 'void*p=1;' | \ - $(1) $(2) -S -o /dev/null -x c - 2>&1 | grep -- $(2) -`"; \ + $(1) $(2) -c -o /dev/null -x c - 2>&1 | grep -- $(2) -`"; \ then echo "$(2)"; else echo "$(3)"; fi ;) ifneq ($(MINIOS_CONFIG),) --- a/minios.mk +++ b/minios.mk @@ -28,6 +28,10 @@ endif # Make the headers define our internal stuff DEF_CFLAGS += -D__INSIDE_MINIOS__ +# Arrange for assembly files to have a proper .note.GNU-stack section added, +# to silence warnings otherwise issued by GNU ld 2.39 and newer. +DEF_ASFLAGS += $(call cc-option,$(CC),-Wa$(comma)--noexecstack) + # Build the CFLAGS and ASFLAGS for compiling and assembling. # DEF_... flags are the common mini-os flags, # ARCH_... flags may be defined in arch/$(TARGET_ARCH_FAM/rules.mk From minios-devel-bounces@lists.xenproject.org Tue Oct 24 10:39:24 2023 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 24 Oct 2023 10:39:24 +0000 Received: from list by lists.xenproject.org with outflank-mailman.621825.968664 (Exim 4.92) (envelope-from ) id 1qvEol-0007bz-35; Tue, 24 Oct 2023 10:39:23 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 621825.968664; Tue, 24 Oct 2023 10:39:23 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qvEol-0007bs-0J; Tue, 24 Oct 2023 10:39:23 +0000 Received: by outflank-mailman (input) for mailman id 621825; Tue, 24 Oct 2023 10:39:21 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qvEoj-0007bm-R3 for minios-devel@lists.xenproject.org; Tue, 24 Oct 2023 10:39:21 +0000 Received: from sonata.ens-lyon.org (domu-toccata.ens-lyon.fr [140.77.166.138]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 95b573b2-7259-11ee-9b0e-b553b5be7939; Tue, 24 Oct 2023 12:39:19 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by sonata.ens-lyon.org (Postfix) with ESMTP id 24E1B200EC; Tue, 24 Oct 2023 12:39:18 +0200 (CEST) Received: from sonata.ens-lyon.org ([127.0.0.1]) by localhost (sonata.ens-lyon.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Lk7cwXmflzlq; Tue, 24 Oct 2023 12:39:16 +0200 (CEST) Received: from begin (nat-inria-interne-52-gw-01-bso.bordeaux.inria.fr [194.199.1.52]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by sonata.ens-lyon.org (Postfix) with ESMTPSA id C4CB7200EB; Tue, 24 Oct 2023 12:39:16 +0200 (CEST) Received: from samy by begin with local (Exim 4.97-RC2) (envelope-from ) id 1qvEoe-0000000AAiD-1YiI; Tue, 24 Oct 2023 12:39:16 +0200 X-BeenThere: minios-devel@lists.xenproject.org List-Id: Mini-os development list List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: minios-devel-bounces@lists.xenproject.org Precedence: list Sender: "Minios-devel" X-Inumbo-ID: 95b573b2-7259-11ee-9b0e-b553b5be7939 Date: Tue, 24 Oct 2023 12:39:16 +0200 From: Samuel Thibault To: Jan Beulich Cc: Minios-devel , Wei Liu , Juergen Gross Subject: Re: [PATCH] build: silence GNU ld 2.39 warning about executable stacks Message-ID: <20231024103916.dqulronf2ieht2rn@begin> Mail-Followup-To: Samuel Thibault , Jan Beulich , Minios-devel , Wei Liu , Juergen Gross References: <1c2d5b1b-27f5-bd56-78e1-2321b76c71da@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1c2d5b1b-27f5-bd56-78e1-2321b76c71da@suse.com> Organization: I am not organized User-Agent: NeoMutt/20170609 (1.8.3) Jan Beulich, le mar. 24 oct. 2023 12:20:40 +0200, a ecrit: > While for C files the compiler is supposed to arrange for emitting > respective information, for assembly sources we're responsible ourselves. > > For the new use of cc-option to work we cannot pass -S to the compiler > anymore. We need the compiler to actually invoke the assembler, so switch > to using -c. > > Signed-off-by: Jan Beulich Reviewed-by: Samuel Thibault > > --- a/Config.mk > +++ b/Config.mk > @@ -1,4 +1,6 @@ > -# > +# Convenient variables > +comma := , > + > # Compare $(1) and $(2) and replace $(2) with $(1) if they differ > # > # Typically $(1) is a newly generated file and $(2) is the target file > @@ -20,7 +22,7 @@ endef > # > # Usage: cflags-y += $(call cc-option,$(CC),-march=winchip-c6,-march=i586) > cc-option = $(shell if test -z "`echo 'void*p=1;' | \ > - $(1) $(2) -S -o /dev/null -x c - 2>&1 | grep -- $(2) -`"; \ > + $(1) $(2) -c -o /dev/null -x c - 2>&1 | grep -- $(2) -`"; \ > then echo "$(2)"; else echo "$(3)"; fi ;) > > ifneq ($(MINIOS_CONFIG),) > --- a/minios.mk > +++ b/minios.mk > @@ -28,6 +28,10 @@ endif > # Make the headers define our internal stuff > DEF_CFLAGS += -D__INSIDE_MINIOS__ > > +# Arrange for assembly files to have a proper .note.GNU-stack section added, > +# to silence warnings otherwise issued by GNU ld 2.39 and newer. > +DEF_ASFLAGS += $(call cc-option,$(CC),-Wa$(comma)--noexecstack) > + > # Build the CFLAGS and ASFLAGS for compiling and assembling. > # DEF_... flags are the common mini-os flags, > # ARCH_... flags may be defined in arch/$(TARGET_ARCH_FAM/rules.mk