Messages in this thread | | | Date | Tue, 09 Jun 2015 16:43:19 -0700 | From | Alexei Starovoitov <> | Subject | Re: [RFC PATCH v6 25/32] perf tools: Add 'bpf.' config section to perf default config |
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On 6/8/15 10:50 PM, Wang Nan wrote: > perf_bpf_config() is added to parse 'bpf' section in perf config file. > Following is an example: > > [bpf] > clang-path = /llvm/bin/x86_64-linux-clang" > llc-path = /llvm/bin/x86_64-linux-llc" > clang-opt = "-nostdinc -isystem /llvm/lib/clang/include -I/kernel/arch/x86/include ..." > llc-opt = ""
a section to specify -I flags to compile prog.c is useful, but users shouldn't be populating it manually for kernel headers. How about adding a script that can figure out $(LINUXINCLUDE) automatically ? You can even invoke such flag detector from perf via something like: f = open /tmpdir/Makefile fprintf(f, "obj-y := dummy.o\n"); fprintf(f, "$(obj)/%%.o: $(src)/%%.c\n"); fprintf(f, "\t@echo -n \"$(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS)\" > %s\n", cachefile); snprintf(cmd, "make -s -C /lib/modules/%s/build M=%s dummy.o", uts_release, tmpdir); system(cmd); read flags from cachefile and cache it for the future. ... or as independent script that populates .perfconfig
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