Hi - > > Maybe add a comment? (no need to repost if you agree): > > > > # Workaround to avoid dtrace(1) produces file with 'hidden' > > # symbol visibility, define STAP_SDT_V2 to produce 'default' > > # symbol visibility instead. > > > > > + QEMU_CFLAGS="$QEMU_CFLAGS -DSTAP_SDT_V2"
Please note that we don't know how long this behavior will persist. You are relying on an accident. :-) Much of the systemtap code doesn't support real STAP_SDT_V2 format, and /usr/include/sys/sdt.h cannot generate it at all. That macro tricks only the dtrace-header-generator to suppress the "hidden" visibility attribute, but doesn't change probe metadata format to the old V2 (in .probes sections rather than .note.* ELF notes). We'll try not to break it, but please move toward the more proper per-solib or per-executable hidden copies of the semaphore objects. - FChE
