fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
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<lorddoskias1>
is systemtap supposed to work when the kernel is built with FENTRY rather than mcount?
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<irker544>
systemtap: mcermak systemtap.git:refs/heads/master * release-3.0-137-g7fe1b7b / : Implement PR12748 by providing the syscall_table tapset files. http://tinyurl.com/hhvo5rq
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<lorddoskias1>
fche: does systemtap use whatever is the current system compiler?
<lorddoskias1>
i'm asking since after compiling my kernel with gcc 4.9.2 (using fentry instead of mcount) i can no longer use systemtap since it refuses to load the resulting kernel modules due to mcount not being found
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<fche>
lorddoskias1, yes, stap tries hard to use the system compiler (resetting $PATH to some extent)
<fche>
that's due to the opposite sorts of incompatibilities
<fche>
see buildrun.cxx
<fche>
make_any_make_cmd ...
<lorddoskias1>
the thing is i used devtoolset-3 to compile my kernel and the reason why this is breaking is (i assume) due to stap using the default 4.4 based compiler
<fche>
maybe we're too paranoid
<lorddoskias1>
if i do for example : scl enable devtoolset-3 stap -g script.stap
<fche>
does your custom compiler have a /bin/NAME that's not just 'gcc'? like 'gcc-4.9.5' or 'gcc -Bfoo' ?
<lorddoskias1>
which compiler should systemtap use - the one in the bootstrappend environment (devtoolset) or the default one
<lorddoskias1>
well my custom compiler is invoked via SCL
<lorddoskias1>
i just bootstrap the software collection and that's it
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<lorddoskias1>
let me check though
<fche>
the cross-compilation kbuild macros may be enough to get at the compiler you really want
<fche>
like stap -BCC=/path/to/scl/gcc etc.
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<irker544>
systemtap: mcermak systemtap.git:refs/heads/master * release-3.0-138-g753f165 / man/cs/stap-server.8 man/cs/stap.1.in man/cs/stapprobes.3stap: Update the Czech version of manpages. http://tinyurl.com/jjakdmc
<lorddoskias1>
fche: indeed, seems to be working now
<lorddoskias1>
but i wonder why it doesn't work when i ran stap inside the scl gcc
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<irker544>
systemtap: mcermak systemtap.git:refs/heads/master * release-3.0-140-g403fa5e / tapset-utrace.cxx: Fix PR20281 by throwing an error if module has_path, which is empty. http://tinyurl.com/zfjxcb8
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<lorddoskias1>
-BCC did the trick :D
<fche>
ok
<lorddoskias1>
where is this documented though
<lorddoskias1>
and also i'd expect to also work as long as i run it with the respective scl command prepended
<fche>
[man stap] describes -B / -a / etc.
<fche>
we don't have a specific example about our $PATH sanitization, or how to override it with these flags
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<lorddoskias1>
righto
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<fche>
if you can think of some brief wording to explain/motivate as a part of the man page, we'd love a patch :)