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Commit bdefbbf2 authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by David S. Miller
Browse files

samples/bpf: like LLC also verify and allow redefining CLANG command 



Users are likely to manually compile both LLVM 'llc' and 'clang'
tools.  Thus, also allow redefining CLANG and verify command exist.

Makefile implementation wise, the target that verify the command have
been generalized.

Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b62a796c

samples/bpf/Makefile

+14 −11
Original line number Diff line number Diff line
@@ -81,9 +81,10 @@ HOSTLOADLIBES_spintest += -lelf 
HOSTLOADLIBES_map_perf_test += -lelf -lrt

HOSTLOADLIBES_test_overhead += -lelf -lrt



# Allows pointing LLC to a LLVM backend with bpf support, redefine on cmdline:

#  make samples/bpf/ LLC=~/git/llvm/build/bin/llc

# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:

#  make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang

LLC ?= llc

CLANG ?= clang



# Trick to allow make to be run from this directory

all:
@@ -93,16 +94,18 @@ clean: 
	$(MAKE) -C ../../ M=$$PWD clean

	@rm -f *~



# Verify LLVM compiler is available and bpf target is supported

.PHONY: verify_cmd_llc verify_target_bpf

# Verify LLVM compiler tools are available and bpf target is supported by llc

.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)



verify_cmd_llc:

	@if ! (which "${LLC}" > /dev/null 2>&1); then \

		echo "*** ERROR: Cannot find LLVM tool 'llc' (${LLC})" ;\

verify_cmds: $(CLANG) $(LLC)

	@for TOOL in $^ ; do \

		if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \

			echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\

			exit 1; \

	else true; fi

		else true; fi; \

	done



verify_target_bpf: verify_cmd_llc

verify_target_bpf: verify_cmds

	@if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \

		echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\

		echo "   NOTICE: LLVM version >= 3.7.1 required" ;\
@@ -115,6 +118,6 @@ $(src)/*.c: verify_target_bpf 
# But, there is no easy way to fix it, so just exclude it since it is

# useless for BPF samples.

$(obj)/%.o: $(src)/%.c

	clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \

	$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \

		-D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \

		-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@

samples/bpf/README.rst

+3 −3
Original line number Diff line number Diff line
@@ -60,7 +60,7 @@ Quick sniplet for manually compiling LLVM and clang 
 $ cmake .. -DLLVM_TARGETS_TO_BUILD="BPF;X86"

 $ make -j $(getconf _NPROCESSORS_ONLN)



It is also possible to point make to the newly compiled 'llc' command

via redefining LLC on the make command line::

It is also possible to point make to the newly compiled 'llc' or

'clang' command via redefining LLC or CLANG on the make command line::



 make samples/bpf/ LLC=~/git/llvm/build/bin/llc
 
 make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang