From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joel Fernandes Subject: [PATCH RFC v2 2/5] samples/bpf: Enable cross compiler support Date: Mon, 7 Aug 2017 06:05:59 -0700 Message-ID: <20170807130602.31785-3-joelaf@google.com> References: <20170807130602.31785-1-joelaf@google.com> Cc: Chenbo Feng , Alison Chaiken , Juri.Lelli@arm.com, Joel Fernandes , Alexei Starovoitov , Daniel Borkmann , netdev@vger.kernel.org (open list:BPF (Safe dynamic programs and tools)) To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <20170807130602.31785-1-joelaf@google.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org When cross compiling, bpf samples use HOSTCC, however what we really want is to use the cross compiler to build for the cross target since that is what will help run the BPF target code. Detect this and also set -static as LDFLAGS since often times we don't have control over what C library the cross target is running and its not smart to rely on it. Signed-off-by: Joel Fernandes --- samples/bpf/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 6c7468eb3684..e5642c8c144d 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -152,6 +152,12 @@ HOSTLOADLIBES_test_map_in_map += -lelf LLC ?= llc CLANG ?= clang +# Detect that we're cross compiling and use the right compilers and flags +ifdef CROSS_COMPILE +HOSTCC = $(CROSS_COMPILE)gcc +HOSTLDFLAGS += -static +endif + # Trick to allow make to be run from this directory all: $(MAKE) -C ../../ $(CURDIR)/ -- 2.14.0.rc1.383.gd1ce394fe2-goog