From patchwork Wed Jul 15 04:34:12 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nathan Lynch X-Patchwork-Id: 6791691 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id E69649F3E6 for ; Wed, 15 Jul 2015 04:39:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 06786206BE for ; Wed, 15 Jul 2015 04:39:58 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 935B6206B5 for ; Wed, 15 Jul 2015 04:39:56 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZFEP7-0004dv-Ve; Wed, 15 Jul 2015 04:34:45 +0000 Received: from relay1.mentorg.com ([192.94.38.131]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZFEP5-0004dD-Tm for linux-arm-kernel@lists.infradead.org; Wed, 15 Jul 2015 04:34:44 +0000 Received: from svr-orw-fem-04.mgc.mentorg.com ([147.34.97.41]) by relay1.mentorg.com with esmtp id 1ZFEOg-0005K5-Gc from Nathan_Lynch@mentor.com ; Tue, 14 Jul 2015 21:34:18 -0700 Received: from localhost (147.34.91.1) by SVR-ORW-FEM-04.mgc.mentorg.com (147.34.97.41) with Microsoft SMTP Server (TLS) id 14.3.224.2; Tue, 14 Jul 2015 21:34:17 -0700 From: Nathan Lynch To: Subject: [PATCH] ARM: VDSO: fix regression with toolchains lacking ld.bfd executable Date: Tue, 14 Jul 2015 23:34:12 -0500 Message-ID: <1436934852-27547-1-git-send-email-nathan_lynch@mentor.com> X-Mailer: git-send-email 2.1.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150714_213443_987900_AEC1385A X-CRM114-Status: UNSURE ( 9.69 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Baruch Siach , Russell King , Stefan Agner Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The Sourcery CodeBench Lite 2014.05 toolchain (gcc 4.8.3, binutils 2.24.51) has a GCC which implements -fuse-ld, and it doesn't include the gold linker, but it lacks an ld.bfd executable in its installation. This means that passing -fuse-ld=bfd fails with: VDSO arch/arm/vdso/vdso.so.raw collect2: fatal error: cannot find 'ld' Arguably this is a deficiency in the toolchain, but I suspect it's commonly used enough that it's worth accommodating: just use cc-ldoption (to cause a link attempt) instead of cc-option to test whether we can use -fuse-ld. So -fuse-ld=bfd won't be used with this toolchain, but the build will rightly succeed, just as it does for toolchains which don't implement -fuse-ld (and don't use gold as the default linker). Note: this will change the failure mode for a corner case I was trying to handle in d2b30cd4b722, where the toolchain defaults to the gold linker and the BFD linker is not found in PATH, from: VDSO arch/arm/vdso/vdso.so.raw collect2: fatal error: cannot find 'ld' i.e. the BFD linker is not found, to: OBJCOPY arch/arm/vdso/vdso.so BFD: arch/arm/vdso/vdso.so: Not enough room for program headers, try linking with -N that is, we fail to prevent gold from being used as the linker, and it produces an object that objcopy can't digest. Reported-by: Baruch Siach Tested-by: Baruch Siach Fixes: d2b30cd4b722 ("ARM: 8384/1: VDSO: force use of BFD linker") Cc: stable@vger.kernel.org Signed-off-by: Nathan Lynch Tested-by: Raphaël Poggi --- arch/arm/vdso/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile index 9d259d94e429..1160434eece0 100644 --- a/arch/arm/vdso/Makefile +++ b/arch/arm/vdso/Makefile @@ -14,7 +14,7 @@ VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 VDSO_LDFLAGS += -nostdlib -shared VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id) -VDSO_LDFLAGS += $(call cc-option, -fuse-ld=bfd) +VDSO_LDFLAGS += $(call cc-ldoption, -fuse-ld=bfd) obj-$(CONFIG_VDSO) += vdso.o extra-$(CONFIG_VDSO) += vdso.lds