[PATCH v2] bpf: Replace deprecated -target with --target= for Clang

From: Fangrui Song
Date: Fri Jun 23 2023 - 20:19:33 EST

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-target has been deprecated since Clang 3.4 in 2013. Use the preferred
--target=bpf form instead. This matches how we use --target= in
scripts/Makefile.clang.

Link: https://github.com/llvm/llvm-project/commit/274b6f0c87a6a1798de0a68135afc7f95def6277
Signed-off-by: Fangrui Song <maskray@xxxxxxxxxx>
Acked-by: Yonghong Song <yhs@xxxxxx>

---
Changes from v1:
* remove two SPDX-License-Identifier: GPL-2.0 to stubs.h
* remove tools/perf changes (will be in a separate patch to perf subsystem)

Signed-off-by: Fangrui Song <maskray@xxxxxxxxxx>
---
Documentation/bpf/bpf_devel_QA.rst | 10 +++++-----
Documentation/bpf/btf.rst | 4 ++--
Documentation/bpf/llvm_reloc.rst | 6 +++---
drivers/hid/bpf/entrypoints/Makefile | 2 +-
kernel/bpf/preload/iterators/Makefile | 2 +-
samples/bpf/Makefile | 6 +++---
samples/bpf/gnu/stubs.h | 2 +-
samples/bpf/test_lwt_bpf.sh | 2 +-
samples/hid/Makefile | 6 +++---
tools/bpf/bpftool/Documentation/bpftool-gen.rst | 4 ++--
tools/bpf/bpftool/Makefile | 2 +-
tools/bpf/runqslower/Makefile | 2 +-
tools/build/feature/Makefile | 2 +-
tools/testing/selftests/bpf/Makefile | 6 +++---
tools/testing/selftests/bpf/gnu/stubs.h | 2 +-
tools/testing/selftests/hid/Makefile | 6 +++---
tools/testing/selftests/net/Makefile | 4 ++--
tools/testing/selftests/tc-testing/Makefile | 2 +-
18 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/Documentation/bpf/bpf_devel_QA.rst b/Documentation/bpf/bpf_devel_QA.rst
index 609b71f5747d..de27e1620821 100644
--- a/Documentation/bpf/bpf_devel_QA.rst
+++ b/Documentation/bpf/bpf_devel_QA.rst
@@ -635,12 +635,12 @@ test coverage.

Q: clang flag for target bpf?
-----------------------------
-Q: In some cases clang flag ``-target bpf`` is used but in other cases the
+Q: In some cases clang flag ``--target=bpf`` is used but in other cases the
default clang target, which matches the underlying architecture, is used.
What is the difference and when I should use which?

A: Although LLVM IR generation and optimization try to stay architecture
-independent, ``-target <arch>`` still has some impact on generated code:
+independent, ``--target=<arch>`` still has some impact on generated code:

- BPF program may recursively include header file(s) with file scope
inline assembly codes. The default target can handle this well,
@@ -658,7 +658,7 @@ independent, ``-target <arch>`` still has some impact on generated code:
The clang option ``-fno-jump-tables`` can be used to disable
switch table generation.

-- For clang ``-target bpf``, it is guaranteed that pointer or long /
+- For clang ``--target=bpf``, it is guaranteed that pointer or long /
unsigned long types will always have a width of 64 bit, no matter
whether underlying clang binary or default target (or kernel) is
32 bit. However, when native clang target is used, then it will
@@ -668,7 +668,7 @@ independent, ``-target <arch>`` still has some impact on generated code:
while the BPF LLVM back end still operates in 64 bit. The native
target is mostly needed in tracing for the case of walking ``pt_regs``
or other kernel structures where CPU's register width matters.
- Otherwise, ``clang -target bpf`` is generally recommended.
+ Otherwise, ``clang --target=bpf`` is generally recommended.

You should use default target when:

@@ -685,7 +685,7 @@ when:
into these structures is verified by the BPF verifier and may result
in verification failures if the native architecture is not aligned with
the BPF architecture, e.g. 64-bit. An example of this is
- BPF_PROG_TYPE_SK_MSG require ``-target bpf``
+ BPF_PROG_TYPE_SK_MSG require ``--target=bpf``

.. Links
diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst
index 7cd7c5415a99..f32db1f44ae9 100644
--- a/Documentation/bpf/btf.rst
+++ b/Documentation/bpf/btf.rst
@@ -990,7 +990,7 @@ format.::
} g2;
int main() { return 0; }
int test() { return 0; }
- -bash-4.4$ clang -c -g -O2 -target bpf t2.c
+ -bash-4.4$ clang -c -g -O2 --target=bpf t2.c
-bash-4.4$ readelf -S t2.o
......
[ 8] .BTF PROGBITS 0000000000000000 00000247
@@ -1000,7 +1000,7 @@ format.::
[10] .rel.BTF.ext REL 0000000000000000 000007e0
0000000000000040 0000000000000010 16 9 8
......
- -bash-4.4$ clang -S -g -O2 -target bpf t2.c
+ -bash-4.4$ clang -S -g -O2 --target=bpf t2.c
-bash-4.4$ cat t2.s
......
.section .BTF,"",@progbits
diff --git a/Documentation/bpf/llvm_reloc.rst b/Documentation/bpf/llvm_reloc.rst
index ca8957d5b671..1b2da781e9e2 100644
--- a/Documentation/bpf/llvm_reloc.rst
+++ b/Documentation/bpf/llvm_reloc.rst
@@ -28,7 +28,7 @@ For example, for the following code::
return g1 + g2 + l1 + l2;
}

-Compiled with ``clang -target bpf -O2 -c test.c``, the following is
+Compiled with ``clang --target=bpf -O2 -c test.c``, the following is
the code with ``llvm-objdump -dr test.o``::

0: 18 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 r1 = 0 ll
@@ -155,7 +155,7 @@ and ``call`` instructions. For example::
return gfunc(a, b) + lfunc(a, b) + global;
}

-Compiled with ``clang -target bpf -O2 -c test.c``, we will have
+Compiled with ``clang --target=bpf -O2 -c test.c``, we will have
following code with `llvm-objdump -dr test.o``::

Disassembly of section .text:
@@ -201,7 +201,7 @@ The following is an example to show how R_BPF_64_ABS64 could be generated::
int global() { return 0; }
struct t { void *g; } gbl = { global };

-Compiled with ``clang -target bpf -O2 -g -c test.c``, we will see a
+Compiled with ``clang --target=bpf -O2 -g -c test.c``, we will see a
relocation below in ``.data`` section with command
``llvm-readelf -r test.o``::

diff --git a/drivers/hid/bpf/entrypoints/Makefile b/drivers/hid/bpf/entrypoints/Makefile
index a12edcfa4fe3..43b99b5575cf 100644
--- a/drivers/hid/bpf/entrypoints/Makefile
+++ b/drivers/hid/bpf/entrypoints/Makefile
@@ -58,7 +58,7 @@ entrypoints.lskel.h: $(OUTPUT)/entrypoints.bpf.o | $(BPFTOOL)

$(OUTPUT)/entrypoints.bpf.o: entrypoints.bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT)
$(call msg,BPF,$@)
- $(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES) \
+ $(Q)$(CLANG) -g -O2 --target=bpf $(INCLUDES) \
-c $(filter %.c,$^) -o $@ && \
$(LLVM_STRIP) -g $@

diff --git a/kernel/bpf/preload/iterators/Makefile b/kernel/bpf/preload/iterators/Makefile
index 8937dc6bc8d0..b83c2f5e9be1 100644
--- a/kernel/bpf/preload/iterators/Makefile
+++ b/kernel/bpf/preload/iterators/Makefile
@@ -50,7 +50,7 @@ iterators.lskel-%.h: $(OUTPUT)/%/iterators.bpf.o | $(BPFTOOL)
$(OUTPUT)/%/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
$(call msg,BPF,$@)
$(Q)mkdir -p $(@D)
- $(Q)$(CLANG) -g -O2 -target bpf -m$* $(INCLUDES) \
+ $(Q)$(CLANG) -g -O2 --target=bpf -m$* $(INCLUDES) \
-c $(filter %.c,$^) -o $@ && \
$(LLVM_STRIP) -g $@

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 615f24ebc49c..595b98d825ce 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -248,7 +248,7 @@ BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
- $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
+ $(CLANG) --target=bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
$(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \
/bin/rm -f ./llvm_btf_verify.o)

@@ -370,7 +370,7 @@ endif
clean-files += vmlinux.h

# Get Clang's default includes on this system, as opposed to those seen by
-# '-target bpf'. This fixes "missing" files on some architectures/distros,
+# '--target=bpf'. This fixes "missing" files on some architectures/distros,
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
#
# Use '-idirafter': Don't interfere with include mechanics except where the
@@ -392,7 +392,7 @@ $(obj)/xdp_router_ipv4.bpf.o: $(obj)/xdp_sample.bpf.o

$(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h $(src)/xdp_sample.bpf.h $(src)/xdp_sample_shared.h
@echo " CLANG-BPF " $@
- $(Q)$(CLANG) -g -O2 -target bpf -D__TARGET_ARCH_$(SRCARCH) \
+ $(Q)$(CLANG) -g -O2 --target=bpf -D__TARGET_ARCH_$(SRCARCH) \
-Wno-compare-distinct-pointer-types -I$(srctree)/include \
-I$(srctree)/samples/bpf -I$(srctree)/tools/include \
-I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \
diff --git a/samples/bpf/gnu/stubs.h b/samples/bpf/gnu/stubs.h
index 719225b16626..1c638d9dce1a 100644
--- a/samples/bpf/gnu/stubs.h
+++ b/samples/bpf/gnu/stubs.h
@@ -1 +1 @@
-/* dummy .h to trick /usr/include/features.h to work with 'clang -target bpf' */
+/* dummy .h to trick /usr/include/features.h to work with 'clang --target=bpf' */
diff --git a/samples/bpf/test_lwt_bpf.sh b/samples/bpf/test_lwt_bpf.sh
index 0bf2d0f6bf4b..148e2df6cdce 100755
--- a/samples/bpf/test_lwt_bpf.sh
+++ b/samples/bpf/test_lwt_bpf.sh
@@ -376,7 +376,7 @@ DST_MAC=$(lookup_mac $VETH1 $NS1)
SRC_MAC=$(lookup_mac $VETH0)
DST_IFINDEX=$(cat /sys/class/net/$VETH0/ifindex)

-CLANG_OPTS="-O2 -target bpf -I ../include/"
+CLANG_OPTS="-O2 --target=bpf -I ../include/"
CLANG_OPTS+=" -DSRC_MAC=$SRC_MAC -DDST_MAC=$DST_MAC -DDST_IFINDEX=$DST_IFINDEX"
clang $CLANG_OPTS -c $PROG_SRC -o $BPF_PROG

diff --git a/samples/hid/Makefile b/samples/hid/Makefile
index 026288280a03..9f7fe29dd749 100644
--- a/samples/hid/Makefile
+++ b/samples/hid/Makefile
@@ -86,7 +86,7 @@ BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
- $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
+ $(CLANG) --target=bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
$(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \
/bin/rm -f ./llvm_btf_verify.o)

@@ -181,7 +181,7 @@ endif
clean-files += vmlinux.h

# Get Clang's default includes on this system, as opposed to those seen by
-# '-target bpf'. This fixes "missing" files on some architectures/distros,
+# '--target=bpf'. This fixes "missing" files on some architectures/distros,
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
#
# Use '-idirafter': Don't interfere with include mechanics except where the
@@ -198,7 +198,7 @@ EXTRA_BPF_HEADERS_SRC := $(addprefix $(src)/,$(EXTRA_BPF_HEADERS))

$(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEADERS_SRC) $(obj)/vmlinux.h
@echo " CLANG-BPF " $@
- $(Q)$(CLANG) -g -O2 -target bpf -D__TARGET_ARCH_$(SRCARCH) \
+ $(Q)$(CLANG) -g -O2 --target=bpf -D__TARGET_ARCH_$(SRCARCH) \
-Wno-compare-distinct-pointer-types -I$(srctree)/include \
-I$(srctree)/samples/bpf -I$(srctree)/tools/include \
-I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \
diff --git a/tools/bpf/bpftool/Documentation/bpftool-gen.rst b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
index 68454ef28f58..5006e724d1bc 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-gen.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
@@ -260,9 +260,9 @@ EXAMPLES
This is example BPF application with two BPF programs and a mix of BPF maps
and global variables. Source code is split across two source code files.

-**$ clang -target bpf -g example1.bpf.c -o example1.bpf.o**
+**$ clang --target=bpf -g example1.bpf.c -o example1.bpf.o**

-**$ clang -target bpf -g example2.bpf.c -o example2.bpf.o**
+**$ clang --target=bpf -g example2.bpf.c -o example2.bpf.o**

**$ bpftool gen object example.bpf.o example1.bpf.o example2.bpf.o**

diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
index 681fbcc5ed50..e9154ace80ff 100644
--- a/tools/bpf/bpftool/Makefile
+++ b/tools/bpf/bpftool/Makefile
@@ -216,7 +216,7 @@ $(OUTPUT)%.bpf.o: skeleton/%.bpf.c $(OUTPUT)vmlinux.h $(LIBBPF_BOOTSTRAP)
-I$(srctree)/tools/include/uapi/ \
-I$(LIBBPF_BOOTSTRAP_INCLUDE) \
-g -O2 -Wall -fno-stack-protector \
- -target bpf -c $< -o $@
+ --target=bpf -c $< -o $@
$(Q)$(LLVM_STRIP) -g $@

$(OUTPUT)%.skel.h: $(OUTPUT)%.bpf.o $(BPFTOOL_BOOTSTRAP)
diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile
index 47acf6936516..d8288936c912 100644
--- a/tools/bpf/runqslower/Makefile
+++ b/tools/bpf/runqslower/Makefile
@@ -62,7 +62,7 @@ $(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(BPFTOOL)
$(QUIET_GEN)$(BPFTOOL) gen skeleton $< > $@

$(OUTPUT)/%.bpf.o: %.bpf.c $(BPFOBJ) | $(OUTPUT)
- $(QUIET_GEN)$(CLANG) -g -O2 -target bpf $(INCLUDES) \
+ $(QUIET_GEN)$(CLANG) -g -O2 --target=bpf $(INCLUDES) \
-c $(filter %.c,$^) -o $@ && \
$(LLVM_STRIP) -g $@

diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 0f0aa9b7d7b5..6654b1a35ab3 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -372,7 +372,7 @@ $(OUTPUT)test-libzstd.bin:
$(BUILD) -lzstd

$(OUTPUT)test-clang-bpf-co-re.bin:
- $(CLANG) -S -g -target bpf -o - $(patsubst %.bin,%.c,$(@F)) | \
+ $(CLANG) -S -g --target=bpf -o - $(patsubst %.bin,%.c,$(@F)) | \
grep BTF_KIND_VAR

$(OUTPUT)test-file-handle.bin:
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 28d2c77262be..ade4db05f338 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -332,7 +332,7 @@ $(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids \
OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)

# Get Clang's default includes on this system, as opposed to those seen by
-# '-target bpf'. This fixes "missing" files on some architectures/distros,
+# '--target=bpf'. This fixes "missing" files on some architectures/distros,
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
#
# Use '-idirafter': Don't interfere with include mechanics except where the
@@ -373,12 +373,12 @@ $(OUTPUT)/cgroup_getset_retval_hooks.o: cgroup_getset_retval_hooks.h
# $3 - CFLAGS
define CLANG_BPF_BUILD_RULE
$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
- $(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2
+ $(Q)$(CLANG) $3 -O2 --target=bpf -c $1 -mcpu=v3 -o $2
endef
# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
define CLANG_NOALU32_BPF_BUILD_RULE
$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
- $(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2
+ $(Q)$(CLANG) $3 -O2 --target=bpf -c $1 -mcpu=v2 -o $2
endef
# Build BPF object using GCC
define GCC_BPF_BUILD_RULE
diff --git a/tools/testing/selftests/bpf/gnu/stubs.h b/tools/testing/selftests/bpf/gnu/stubs.h
index 719225b16626..1c638d9dce1a 100644
--- a/tools/testing/selftests/bpf/gnu/stubs.h
+++ b/tools/testing/selftests/bpf/gnu/stubs.h
@@ -1 +1 @@
-/* dummy .h to trick /usr/include/features.h to work with 'clang -target bpf' */
+/* dummy .h to trick /usr/include/features.h to work with 'clang --target=bpf' */
diff --git a/tools/testing/selftests/hid/Makefile b/tools/testing/selftests/hid/Makefile
index 01c0491d64da..2e986cbf1a46 100644
--- a/tools/testing/selftests/hid/Makefile
+++ b/tools/testing/selftests/hid/Makefile
@@ -167,7 +167,7 @@ $(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids \
OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)

# Get Clang's default includes on this system, as opposed to those seen by
-# '-target bpf'. This fixes "missing" files on some architectures/distros,
+# '--target=bpf'. This fixes "missing" files on some architectures/distros,
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
#
# Use '-idirafter': Don't interfere with include mechanics except where the
@@ -196,12 +196,12 @@ CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
# $3 - CFLAGS
define CLANG_BPF_BUILD_RULE
$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
- $(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2
+ $(Q)$(CLANG) $3 -O2 --target=bpf -c $1 -mcpu=v3 -o $2
endef
# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
define CLANG_NOALU32_BPF_BUILD_RULE
$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
- $(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2
+ $(Q)$(CLANG) $3 -O2 --target=bpf -c $1 -mcpu=v2 -o $2
endef
# Build BPF object using GCC
define GCC_BPF_BUILD_RULE
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index c12df57d5539..359389a66935 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -112,7 +112,7 @@ $(MAKE_DIRS):
mkdir -p $@

# Get Clang's default includes on this system, as opposed to those seen by
-# '-target bpf'. This fixes "missing" files on some architectures/distros,
+# '--target=bpf'. This fixes "missing" files on some architectures/distros,
# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
#
# Use '-idirafter': Don't interfere with include mechanics except where the
@@ -130,7 +130,7 @@ endif
CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))

$(OUTPUT)/nat6to4.o: nat6to4.c $(BPFOBJ) | $(MAKE_DIRS)
- $(CLANG) -O2 -target bpf -c $< $(CCINCLUDE) $(CLANG_SYS_INCLUDES) -o $@
+ $(CLANG) -O2 --target=bpf -c $< $(CCINCLUDE) $(CLANG_SYS_INCLUDES) -o $@

$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
$(APIDIR)/linux/bpf.h \
diff --git a/tools/testing/selftests/tc-testing/Makefile b/tools/testing/selftests/tc-testing/Makefile
index cb553eac9f41..3c4b7fa05075 100644
--- a/tools/testing/selftests/tc-testing/Makefile
+++ b/tools/testing/selftests/tc-testing/Makefile
@@ -24,7 +24,7 @@ CLANG_FLAGS = -I. -I$(APIDIR) \

$(OUTPUT)/%.o: %.c
$(CLANG) $(CLANG_FLAGS) \
- -O2 -target bpf -emit-llvm -c $< -o - | \
+ -O2 --target=bpf -emit-llvm -c $< -o - | \
$(LLC) -march=bpf -mcpu=$(CPU) $(LLC_FLAGS) -filetype=obj -o $@

TEST_PROGS += ./tdc.sh
--
2.41.0.178.g377b9f9a00-goog

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