$ objdump.exe -t Kbh.o

Kbh.o:     file format pe-x86-64

SYMBOL TABLE:
[  0](sec -2)(fl 0x00)(ty   0)(scl 103) (nx 1) 0x0000000000000000 Kbh.c
File
[  2](sec  1)(fl 0x00)(ty  20)(scl   3) (nx 1) 0x0000000000000000 XS_Kbh_send_string
AUX tagndx 0 ttlsiz 0x0 lnnos 0 next 0
   . . . elided . . .
[ 37](sec  0)(fl 0x00)(ty   0)(scl   2) (nx 0) 0x0000000000000000 __imp_PL_thr_key
[ 38](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x0000000000000000 pthread_getspecific
[ 39](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x0000000000000000 Perl_sv_2pv_flags
[ 40](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x0000000000000000 send_string
[ 41](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x0000000000000000 Perl_croak_xs_usage
[ 42](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x0000000000000000 Perl_xs_handshake
[ 43](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x0000000000000000 Perl_newXS_deffile
[ 44](sec  0)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x0000000000000000 Perl_xs_boot_epilog

$ objdump.exe -t send_string.o

send_string.o:     file format pe-x86-64

SYMBOL TABLE:
[  0](sec -2)(fl 0x00)(ty   0)(scl 103) (nx 1) 0x0000000000000000 send_string.cpp
File
[  2](sec  1)(fl 0x00)(ty  20)(scl   2) (nx 1) 0x0000000000000000 _Z11send_stringPKc
AUX tagndx 0 ttlsiz 0x0 lnnos 0 next 0
   . . . elided . . .