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From: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
To: ast@kernel.org, daniel@iogearbox.net, yhs@fb.com,
	davem@davemloft.net, jakub.kicinski@netronome.com,
	hawk@kernel.org, john.fastabend@gmail.com
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, clang-built-linux@googlegroups.com,
	ilias.apalodimas@linaro.org, sergei.shtylyov@cogentembedded.com,
	Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Subject: [PATCH v4 bpf-next 12/15] libbpf: add C/LDFLAGS to libbpf.so and test_libpf targets
Date: Wed,  9 Oct 2019 23:41:31 +0300
Message-ID: <20191009204134.26960-13-ivan.khoronzhuk@linaro.org> (raw)
In-Reply-To: <20191009204134.26960-1-ivan.khoronzhuk@linaro.org>

In case of C/LDFLAGS there is no way to pass them correctly to build
command, for instance when --sysroot is used or external libraries
are used, like -lelf, wich can be absent in toolchain. This can be
used for samples/bpf cross-compiling allowing to get elf lib from
sysroot.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
 tools/lib/bpf/Makefile | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 46280b5ad48d..75b538577c17 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -174,8 +174,9 @@ bpf_helper_defs.h: $(srctree)/include/uapi/linux/bpf.h
 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
 
 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
-	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
-				    -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
+	$(QUIET_LINK)$(CC) $(LDFLAGS) \
+		--shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
+		-Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
 	@ln -sf $(@F) $(OUTPUT)libbpf.so
 	@ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
 
@@ -183,7 +184,7 @@ $(OUTPUT)libbpf.a: $(BPF_IN)
 	$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
 
 $(OUTPUT)test_libbpf: test_libbpf.c $(OUTPUT)libbpf.a
-	$(QUIET_LINK)$(CC) $(INCLUDES) $^ -lelf -o $@
+	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(INCLUDES) $^ -lelf -o $@
 
 $(OUTPUT)libbpf.pc:
 	$(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
-- 
2.17.1


  parent reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09 20:41 [PATCH v4 bpf-next 00/15] samples: bpf: improve/fix cross-compilation Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 01/15] samples/bpf: fix HDR_PROBE "echo" Ivan Khoronzhuk
2019-10-09 22:42   ` Andrii Nakryiko
2019-10-09 20:41 ` [PATCH v4 bpf-next 02/15] samples/bpf: fix cookie_uid_helper_example obj build Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 03/15] samples/bpf: use --target from cross-compile Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 04/15] samples/bpf: use own EXTRA_CFLAGS for clang commands Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 05/15] samples/bpf: use __LINUX_ARM_ARCH__ selector for arm Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 06/15] samples/bpf: drop unnecessarily inclusion for bpf_load Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 07/15] samples/bpf: add makefile.target for separate CC target build Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 08/15] samples/bpf: base target programs rules on Makefile.target Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 09/15] samples/bpf: use own flags but not HOSTCFLAGS Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 10/15] samples/bpf: use target CC environment for HDR_PROBE Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 11/15] libbpf: don't use cxx to test_libpf target Ivan Khoronzhuk
2019-10-10  0:26   ` Andrii Nakryiko
2019-10-09 20:41 ` Ivan Khoronzhuk [this message]
2019-10-09 20:41 ` [PATCH v4 bpf-next 13/15] samples/bpf: provide C/LDFLAGS to libbpf Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 14/15] samples/bpf: add sysroot support Ivan Khoronzhuk
2019-10-09 20:41 ` [PATCH v4 bpf-next 15/15] samples/bpf: add preparation steps and sysroot info to readme Ivan Khoronzhuk
2019-10-11  0:00 ` [PATCH v4 bpf-next 00/15] samples: bpf: improve/fix cross-compilation Daniel Borkmann
2019-10-11  0:29   ` Ivan Khoronzhuk

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