diff options
| -rw-r--r-- | samples/bpf/Makefile | 25 | ||||
| -rw-r--r-- | samples/bpf/README.rst | 6 |
2 files changed, 17 insertions, 14 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index dd63521832d8..66897e61232c 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -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=$$PWD clean @rm -f *~ -# Verify LLVM compiler is available and bpf target is supported -.PHONY: verify_cmd_llc verify_target_bpf +# Verify LLVM compiler tools are available and bpf target is supported by llc +.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC) -verify_cmd_llc: - @if ! (which "${LLC}" > /dev/null 2>&1); then \ - echo "*** ERROR: Cannot find LLVM tool 'llc' (${LLC})" ;\ - exit 1; \ - else true; fi +verify_cmds: $(CLANG) $(LLC) + @for TOOL in $^ ; do \ + if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \ + echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\ + exit 1; \ + else true; fi; \ + 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 $@ diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst index e36687d900c8..a43eae3f0551 100644 --- a/samples/bpf/README.rst +++ b/samples/bpf/README.rst @@ -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 |