From: Joel Fernandes <joelaf@google.com>
To: linux-kernel@vger.kernel.org
Cc: Chenbo Feng <fengc@google.com>,
Alison Chaiken <alison@she-devel.com>,
Juri Lelli <jlelli@google.com>,
Joel Fernandes <joelaf@google.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
netdev@vger.kernel.org (open list:BPF (Safe dynamic programs and
tools))
Subject: [PATCH RFC 2/5] samples/bpf: Enable cross compiler support
Date: Mon, 7 Aug 2017 06:03:03 -0700 [thread overview]
Message-ID: <20170807130306.31530-3-joelaf@google.com> (raw)
In-Reply-To: <20170807130306.31530-1-joelaf@google.com>
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 <joelaf@google.com>
---
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
next prev parent reply other threads:[~2017-08-07 13:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-07 13:03 [PATCH RFC 0/5] add arm64 cross compilation support to BPF samples Joel Fernandes
2017-08-07 13:03 ` [PATCH RFC 1/5] samples/bpf: Use getppid instead of getpgrp for array map stress Joel Fernandes
2017-08-07 13:03 ` Joel Fernandes [this message]
2017-08-07 13:03 ` [PATCH RFC 3/5] samples/bpf: Fix inline asm issues building samples on arm64 Joel Fernandes
2017-08-07 13:03 ` [PATCH RFC 4/5] samples/bpf: Fix pt_regs issues when cross-compiling Joel Fernandes
2017-08-07 13:03 ` [PATCH RFC 5/5] samples/bpf: Add documentation on cross compilation Joel Fernandes
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