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d="scan'208";a="60634112" From: Anthony PERARD To: CC: Anthony PERARD , Andrew Cooper , George Dunlap , "Ian Jackson" , Jan Beulich , Julien Grall , Stefano Stabellini , Wei Liu Subject: [XEN PATCH v8 11/47] build: fix enforce unique symbols for recent clang version Date: Thu, 25 Nov 2021 13:39:30 +0000 Message-ID: <20211125134006.1076646-12-anthony.perard@citrix.com> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211125134006.1076646-1-anthony.perard@citrix.com> References: <20211125134006.1076646-1-anthony.perard@citrix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1637847670737100001 Content-Type: text/plain; charset="utf-8" clang 6.0 and newer behave like gcc in regards for the FILE symbol, so only the filename rather than the full path to the source file. clang 3.8.1-24 (in our debian:stretch container) and 3.5.0-10 (in our debian:jessie container) do store the full path to the source file in the FILE symbol. This means that we also need to check clang version to figure out which command we need to use to redefine symbol. I don't know which version of clang change behavior, we will guess 4.0. Signed-off-by: Anthony PERARD --- "enforce unique symbols" works by chance with recent clang version. The few object built from source in subdir don't pose an issue. With checking for 4.0 or newer, build may fails with a version of clang between 4.0 and 6.0. With checking for 6.0 or newer, no build fails, but maybe that will happen later with patch "build: build everything from the root dir, use obj=3D$subdir" applied. --- Notes: v8: - new patch, extracted from "build: build everything from the root dir,= use obj=3D$subdir" xen/Rules.mk | 2 +- xen/scripts/Kbuild.include | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/xen/Rules.mk b/xen/Rules.mk index 60d1d6c4f583..14b6e7fdd721 100644 --- a/xen/Rules.mk +++ b/xen/Rules.mk @@ -166,7 +166,7 @@ SRCPATH :=3D $(patsubst $(BASEDIR)/%,%,$(CURDIR)) quiet_cmd_cc_o_c =3D CC $@ ifeq ($(CONFIG_ENFORCE_UNIQUE_SYMBOLS),y) cmd_cc_o_c =3D $(CC) $(c_flags) -c $< -o $(dot-target).tmp -MQ $@ - ifeq ($(CONFIG_CC_IS_CLANG),y) + ifeq ($(CONFIG_CC_IS_CLANG)$(call clang-ifversion,-lt,400,y),yy) cmd_objcopy_fix_sym =3D $(OBJCOPY) --redefine-sym $<=3D$(SRCPATH)/= $< $(dot-target).tmp $@ else cmd_objcopy_fix_sym =3D $(OBJCOPY) --redefine-sym $(