bcc_usdt.h no longer shared

[brendangregg]

This came with bcc, and is used by bpftrace, but no longer is shipped. bpftrace builds get:

/mnt/src/bpftrace/src/ast/irbuilderbpf.h:5:10: fatal error: bcc_usdt.h: No such file or directory
 #include "bcc_usdt.h"
          ^~~~~~~~~~~~

bpftrace/bpftrace#389

in bcc it's still in src/cc/CMakeLists.txt:

if(ENABLE_USDT)
  list(APPEND bcc_api_headers bcc_usdt.h)

But I don't get bcc_usdt.h in libbpfcc or libbpfcc-dev (version 5.0). Maybe that CMakeLists.txt file needs updating again to add it to libbpfcc-dev?

The symbols are in the library:

# objdump -tT /usr/lib/x86_64-linux-gnu/libbcc.so.0.5.0 | grep bcc_usdt
000000000232a810 g    DF .text	0000000000000100  Base        bcc_usdt_get_probe_argctype
000000000232a920 g    DF .text	00000000000000f2  Base        bcc_usdt_get_location
000000000232f1d0 g    DF .text	0000000000000e7d  Base        bcc_usdt_genargs
000000000232aa20 g    DF .text	0000000000000005  Base        bcc_usdt_foreach_uprobe
000000000232e8e0 g    DF .text	000000000000005f  Base        bcc_usdt_new_frompid
000000000232e530 g    DF .text	00000000000000e6  Base        bcc_usdt_new_frompath
[...]

[brendangregg]

Oh, maybe we debugged this before and it was due to Ubuntu 18.04 having an older bcc? bpftrace/bpftrace#335

[mmarchini]

Seems to be included on libbcc packages (at least on recent versions). Can we close this?

[yonghong-song]

Yes, let close this. 0.8 and 0.9 should have it.