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d="scan'208";a="59420564" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Juergen Gross , Wei Liu , Anthony PERARD Subject: [PATCH] tools/libs: Don't recursively expand MAJOR ?= $(shell ...) Date: Mon, 13 Dec 2021 19:04:49 +0000 Message-ID: <20211213190449.4830-1-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1639422478555100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" ?=3D is a deferred assignment. Switch to an alternative form which lets us= use an immediate assignment. Before, version.sh gets run anywhere between 46 and 88 times, with 50 on a `clean`. After, 6 times, invariant of main rune, and whether it is an incremental build or not. Signed-off-by: Andrew Cooper Reviewed-by: Anthony PERARD --- CC: Juergen Gross CC: Wei Liu CC: Anthony PERARD The identity transform comes from the docs https://www.gnu.org/software/make/manual/make.html#Flavors (final paragraph= ). Something slightly weird is going on. Before this, the exact number of hits that verson.sh gets isn't stable, even when running repeat incremental buil= ds. I suspect this means we've got a lurking parallel build issue. --- tools/libs/libs.mk | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/libs/libs.mk b/tools/libs/libs.mk index dfbbef4080f6..b21e0bf083a0 100644 --- a/tools/libs/libs.mk +++ b/tools/libs/libs.mk @@ -6,7 +6,10 @@ # MINOR: minor version of lib (0 if empty) =20 LIBNAME :=3D $(notdir $(CURDIR)) -MAJOR ?=3D $(shell $(XEN_ROOT)/version.sh $(XEN_ROOT)/xen/Makefile) + +ifeq ($(origin MAJOR), undefined) +MAJOR :=3D $(shell $(XEN_ROOT)/version.sh $(XEN_ROOT)/xen/Makefile) +endif MINOR ?=3D 0 =20 SHLIB_LDFLAGS +=3D -Wl,--version-script=3Dlibxen$(LIBNAME).map --=20 2.11.0