Why I'm seeing so many 0 Line number addresses in recently file compiled by clang?
like the result from llvm-dwarfdump below:
Address Line Column File ISA Discriminator Flags
------------------ ------ ------ ------ --- ------------- -------------
0x0000000000000000 287 0 4 0 0 is_stmt
0x0000000000000030 287 0 4 0 0 is_stmt prologue_end
**0x0000000000000034 0 0 4 0 0**
0x0000000000000038 293 2 4 0 0 is_stmt
**0x0000000000000060 0 2 4 0 0**
0x0000000000000064 300 6 4 0 0 is_stmt
0x000000000000006c 295 38 4 0 0 is_stmt
0x0000000000000070 297 14 4 0 0 is_stmt
0x0000000000000074 300 6 4 0 0 is_stmt
0x0000000000000078 300 6 4 0 0
0x000000000000007c 0 6 4 0 0
0x0000000000000080 301 3 4 0 0 is_stmt
0x0000000000000088 0 0 4 0 0
0x000000000000008c 301 3 4 0 0
0x0000000000000090 306 26 4 0 0 is_stmt
0x00000000000000a0 306 40 4 0 0
0x00000000000000a8 270 11 4 0 0 is_stmt
0x00000000000000ac 273 15 4 0 0 is_stmt
0x00000000000000b0 271 32 4 0 0 is_stmt
0x00000000000000b4 273 43 4 0 0 is_stmt
what compiler flag is causing it?