Re: [PATCH tracing/kprobes v2 4/5] perf: Add perf probe subcommandfor kprobe-event setup helper

[Steven Rostedt]

On Mon, 2009-10-05 at 20:57 -0400, Masami Hiramatsu wrote:
> Steven Rostedt wrote:
> > On Fri, 2009-10-02 at 17:49 -0400, Masami Hiramatsu wrote:
> >> diff --git a/tools/perf/Makefile b/tools/perf/Makefile
> >> index b5f1953..6dabcf1 100644
> >> --- a/tools/perf/Makefile
> >> +++ b/tools/perf/Makefile
> >> @@ -419,6 +419,16 @@ ifneq ($(shell sh -c "(echo '\#include <libelf.h>'; echo 'int main(void) { Elf *
> >>  	msg := $(error No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel);
> >>  endif
> >>  
> >> +ifneq ($(shell sh -c "(echo '\#include <libdwarf/dwarf.h>'; echo '\#include <libdwarf/libdwarf.h>'; echo 'int main(void) { Dwarf_Debug dbg; Dwarf_Error err; dwarf_init(0, DW_DLC_READ, 0, 0, &dbg, &err); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -ldwarf -lelf -o /dev/null $(ALL_LDFLAGS) > /dev/null 2>&1 && echo y"), y)
> >> +	msg := $(warning No libdwarf.h found, disables probe subcommand. Please install libdwarf-dev/libdwarf-devel);
> > 
> > Wow! And I thought my macros were ugly ;-)
> 
> :-)
> Maybe, would I better make a separate c file to check this?
> Like "autoconf-checkdwarf.c".


Nah, I think it is pretty obvious to what it is doing. But then again, I
like ugly hacks like the above.

-- Steve


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